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HP 24S Reference Guide

1. ESD in Europe Radiated Emissions prEN 55024 3 1991 IEC 801 3 draft 3 V m in Europe These specifications are legal requirements in the indicated countries Datacomm Declarations United Kingdom The HP 28684B and HP 28688B hubs are approved under Approval Number NS G 1234 100003 for indirect connection to public telecommunications systems within the United Kingdom Sweden Application and Declaration of Conformity to Swedish requirements has been filed Germany Application for Certification and License approval have been filed B 2 Specifications HP 28699A Hub Plus 48 Physical Dimensions 42 5 cm by 23 5 cm by 8 9 cm 16 8 in by 9 3 in by 3 5 in Weight 3 8 kg 8 8 Ib Electrical The HP 28699A hub automatically adjusts to any voltage between 90 and 240 volts and any frequency between 50 and 60 Hz ac voltage 100 120 volts 200 240 volts Maximum current 0 6 amps 0 5 amps Frequency range 50 60 Hz 50 60 Hz Environmental Operating Non Operating Temperature 0 C to 55 C 40 C to 70 C 32 F to 131 F 40 F to 158 F Relative humidity 15 to 95 15 to 90 non condensing at 40 C 104 F at 65 C 149 F Maximum altitude 4 6 km 15 000 ft 4 6 km 15 000 ft Cable Interfaces m The 50 pin twisted pair port is compatible with the IEEE 802 3 Type 10Base T standard m TheThinLAN port is compatible with the IEEE 802 3 Type 10Base2 standard The AUI port is compatible with IEEE 802 3 s
2. y the hub s case could result lt 3 Attach the twisted pair DS lt network cables to the Sele ASS lt A modular adapter Push the A ING l N cable s 8 pin plug into the E 2 jack until it dicks into place ST Thumb screw 2 10 Installation Using a right angle 50 pin connector 1 Loosen the Velcro strap to make room for the 50 pin connector 2 Slip the connector inside the strap and plug it into the twisted pair port 3 Pull down on the Velcro strap end to tighten it then pull up and secure the end to the strap 50 pin connector Twisted pair port Velcro strap AL to cross connect block Note f you are using a mixture of modular adapters and right angle 50 pin connectors on a Hub Plus 48 position the modular adapters on ports to the left of the 50 pin connectors For information on twisted pair cabling schemes using the 50 pin connector see the HP EtherTwist Technical Reference Guide part number 5091 3237E Using a straight out 50 pin connector 1 Remove the Velcro strap holder by unscrewing and removing the two screws that hold it to the back of the hub 2 Attach standoffs p n 1252 3056 You can use the standoffs from an unused console port or form the back of the modular adapter that came with your hub HP 28684B or 28688B only Becareful not to over tighten the stand offs Damageto the hub s case could result 3 Plugin the connector and secure it to the standoffs Inst
3. Disable the SQE Test signal quality error or heartbeat test signal AUI retainer and Loopback Test options if present on the transceiver See Note below AUI port on hub oF Slide the AUI retainer included x i onto the connector posts on the transceiver or AUI cable NIE RI Plug the transceiver or AUI cable LN intothe AUI port on the hub and Transceiver or AUI I secure it with the retainer s screws cable A Tighten the screws until they are snug do not over tighten then Attach the network cable to the transceiver Disable SQE Test on Transceiver Any transceiver used with this hub must allow disabling the SQE test An HP 28641A ThinMAU does not meet this requirement and cannot be used Instead use an HP 28641B ThinLAN Transceiver Similarly an HP 30241A ThickMAU with date code D 3017 or earlier cannot be used The date code is found on a small white sticker on the body of the device Lower numbers indicate an earlier manufacturing date Instead use an HP 30241A with date code F 3105 or later and follow the instructions that are included with the ThickMAU for disabling SQE test Installation 2 13 4 Customize the hub s configuration if needed No changes to the hub s default configuration are required for the hub to operate correctly The hubs each have a console interface for customizing the hub s configuration monitoring its activity and running diagnostics To configure the hub fir
4. and HP 29699A comply with ISO IEC Guide 22 and EN 45014 The declarations identify the product the manufacturer s name and address and the applicable specifications that are recognized in the European community DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN45014 Manufacturer s Name Hewlett Packard Company Manufacturer s Address 8000 Foothills Blvd Roseville CA 95678 U S A declares that the product Product Name HP EtherTwist Hub 12 Model Number HP 28684B conforms to the following Product Specifications Safety EN 60950 IEC 950 EMC EN 55022 1988 CISPR 22 1985 class A prEN 55101 2 1990 IEC 801 2 1991 3 kV CD 8 kV AD prEN 55024 3 1991 IEC 801 3 1984 3 V m Supplementary Information None Roseville June 1 1992 A A ti Sandra L Sheehan Quality Manager 2 Regulatory Statements DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN45014 Manufacturer s Name Hewlett Packard Company Manufacturer s Address 8000 Foothills Blvd Roseville CA 95678 U S A declares that the product Product Name EtherTwist Hub Plus Model Number HP 28688B conforms to the following Product Specifications Safety EN 60950 TEC 950 EMC EN 55022 1991 CISPR 22 class A prEN 55101 2 1991 IEC 801 2 3 kV CD 8 kV AD prEN 55024 3 1991 IEC 801 3 DRAFT 3 V m Supplementary Information None Roseville February 6 1992 a dra Se het A Sandra L Sheeh
5. lt port gt lt ON OFF gt enable or disable link beat for a port Pfissuord change the netuork management access passuord PIng perform netuork layer ICMP Echo Request test POrt lt port gt lt ONI OFF gt enable or disable specified port REset reset hub and run power on self test SPeed neu speed change the console baud rate to 300 1288 2400 or 9600 STatus display port status TEstlink perform data link layer communication test THinuatch lt ONIOFF gt enable or disable Thinuatch gt The commands and their uses are described in the rest of the chapter HElp To see a list and brief description of all available commands HElp command To see the syntax and description of a specific console command For the lt command gt parameter use the first two letters of the command you wish to see Example HE ST This displays help for the Status command 3 2 Operation BAckup HP 28688B and HP 28699A Only To configure one of the hub s ports for dedicated use in a backup redundant link to another hub The HP EtherTwist Hub Plus and Hub Plus 48 allow you to use any two of their network ports for a link to another hub in your network The backup link normally carries no traffic but it is automatically activated if the primary link fails Notethat any of the ports can be the backup port to any other port When you enter the Backup command you are prompted for these values Backup Port The port
6. prompt 3 Adjust Baud Rate Procedure d a Temporarily set the baud rate in the terminal s own configuration to 2400 b C Press RETURN several times for the prompt Set the hub s baud rateto the desired rate for example 9600 by using the console s Speed command see Console Commands in chapter 3 Set theterminal s configuration to this new baud rate and press RETURN again for the prompt 4 Test Console Port Procedure a d Detach the console cable from the hub Attach the console port s loopback connector to the hub HP part no 5062 3355 see appendix A Cables and Connectors Cyde power on the hub by unplugging the power cord and plugging it in again As part of its power on self test the hub tests the console port If thetest passes the fault LED goes OFF the console port should be functional i Removethe loopback connector and cycle power again ii Connect the console cable to the hub Press RETURN several times for the prompt If the fault LED remains ON the hub is faulty and must be replaced 2 16 Installation Configuration Commands Several of the console commands allow you to customize the operation of your hub They are listed and described here Command Name Command Function Factory Preset Value Backup HP 28688B and HP 28699A only Configures one of the hub s ports for dedicated use in a backup redundant link to another hub No backup link c
7. you can test the hub using the procedures on the previous page Y ou should also verify that the remote device is powered on and functioning properly and that the cableis good Testing Twisted Pair Cabling Twisted pair cable must be compatible with thel EEE 802 3 Type 10Base T standard Instruments are available that you can useto verify that your cable is compatible with this standard One such instrument is the HP 28687A Wire Test Instrument HP also offers a wire testing service Contact your local HP sales office for more information Troubleshooting 4 5 Cables and Connectors This appendix lists cables that have been tested and verified for use with the HP EtherTwist Hubs It also includes minimum pin out information so if you wish to use an unlisted cable you can verify that the cables used in your installation are correctly wired Note that each pin out does not necessarily match the pin out for the corresponding HP cable but cables manufactured to follow the minimum pin out will function correctly Note Incorrectly wired cabling is the most common cause of problems for LAN communications HP recommends that you work with a qualified LAN cable installer for assistance with your cabling requirements These topics are discussed m HP cables m Other standard cables m Twisted pair cable connector pin outs m Thin LAN cable requirements m AUI cable Console connector and cable pin outs m Console port loopback connector Cab
8. 12 10 8 6 4 2 Power green is ON if the hub is receiving power y YE This is the same as Line On on the front 252 1975 3 1 9 km 2 z Twisted Pair Ports lt o E o FP Activity green is ON when data is being transmitted The frequency shows the amount of traffic In heavy traffic it may appear on all thetime This LED is repeated on the front Fault yellow is ON if the hub is faulty and needs to be replaced FLASHING if a port has been auto segmented This LED is repeated on the front Collision yellow is ON when collisions two or more nodes trying to transmit on the network at the same time are detected on any of the attached cable segments If collisions are infrequent which is normal the light may be imperceptible If it appears on continuously see chapter 4 Troubleshooting Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 1 5 Port LEDs green one for each network port are ON when the corresponding port is enabled and functioning normally Ports can be enabled and disabled using the Port command on the hub s console The AUI port LED is always ON when that port is enabled even if it is not being used For the twisted pair ports the LED will be OFF if the link beat signal is not received from the device connected to that port Each Port LED will FLASH if the port has been auto segmented see Auto Segmentation later in this chapter To view the twisted pair port LEDs on the HP
9. Bak of the AUD a da eroe xnl Mis nasal ea in Sada AUS 1 5 Status LEDS ssa 8 em ae xo eo ae A OR 1 5 HowtheHubWorks 1 6 Collision Detection 1 6 Auto Segmentation 1 7 LinKk Beat lt a ea EGRE a re RUE 1 7 Firmware Enhancements HP 28688B and HP 28699A Only 1 8 Network Management HP 28688B and HP 28699A Only 1 8 Upgrading the HP 28684B to an HP 28688B 1 10 2 Installation Installation Summary sls 2 1 1 Mount th hub ire XX RIED GIA S SR Der eaa s 2 2 Mounting the HP 28684B EtherTwist Hub 12 and HP 28688B HubPlus 2 3 Mounting the HP 28699A Hub Plus 48 2 5 2 Plug in the hub and verify its operation 2 7 3 Connect the hub to device and networks 2 8 Connecting Computers 2 8 Connecting to a Network Backbone 2 8 Connecting Other Hubs 2 9 Port Connections mg E ee ed gro a 2 10 Twisted Palt POort s eva due Ro as AVR Land strate 2 10 ThinLAN Port sese DR he eh ETE Es 2 12 AUMPO E et RA a te oe En EE 2 13 4 Customize the hub s configuration if needed 2 14 Console Connection 2 14 Connecting a Modem and Terminal 2 15 If You Have Trouble with a Terminal or M
10. EtherTwist Hub Plus 48 press the Group Selector button until the port group you wish to view group A B C or D is displayed The group selector LED identifies which port group is being displayed by the twisted pair port LEDs How the Hub Works The HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 are multiport repeaters Data signals coming into the hub from any of its ports are automatically regenerated and transmitted to all the other hub ports The hub regenerates the data without interpreting the contents so it can be used in either IEEE 802 3 or Ethernet networks and with any upper level protocol Collision Detection These hubs also perform collision detection A collision occurs when two nodes try to transmit at the same time When the hub detects this it stops repeating the colliding transmissions and starts transmitting a jamming signal The jamming signal tells the transmitting nodes that a collision has occurred The colliding nodes then stop transmitting for a random amount of time before attempting to retransmit the data Once the collision condition is removed the hub stops transmitting the jamming signal and normal operation is restored 1 6 Introducing the HP EtherT wist Hub 12 Hub Plus and Hub Plus 48 Auto Segmentation These hubs will automatically disable auto segment a port if it experiences excessive collisions greater than 30 consecutive collisions The port will automatically return to operation if the e
11. Link Using Alternative Medium E 7 Safety Information Regulatory Statements One Year Limited Hardware Warranty Index Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 The HP 28684B EtherTwist Hub 12 HP 28688B EtherTwist Hub Plus and HP 28699A EtherTwist Hub Plus 48 are 10 M bit s multiport repeaters used to connect computers and other networked devices in an unshielded twisted pair cable network These hubs are compatible with the IEEE 802 3 Type 10Base T standard See the document HP EtherTwist Technical Reference Guide part number 5091 3237E for network configuration guidelines Features TheHP EtherTwist hubs havethe following features m Thefollowing ports 12 twisted pair ports HP EtherTwist Hub 12 and HP EtherTwist Hub Plus or 48 twisted pair ports HP EtherTwist Hub Plus 48 for connection to twisted pair cable A ThinLAN port for connection to thin LAN coaxial cable An AUI port for connection to an external transceiver This additional port can be used with the appropriate transceiver to connect any media such as twisted pair thick or thin coaxial and fiber optic cable It can be used at the same time the other ports are being used Note that all the network ports twisted pair ThinLAN and AUI areactive and can be used at the same time An RS 232 C console port for attaching a terminal or terminal emulator that can be used to customize the hub s configuration m
12. These products use a windows interface to manage multiple HP hubs and other HP network devices automatically generate a graphic display of the network map gather network traffic statistics configure ports run tests of the hub test network links to other devices Note The functionality provided by HP network management products is improved on a regular basis For more information on the capabilities of these products contact your HP authorized LAN dealer or local HP sales office 1 8 Introducing the HP EtherT wist Hub 12 Hub Plus and Hub Plus 48 Network Address The communication between the hub and the network management station requires that the hub be assigned a network address If you are using your hub in a Novell NetWare network it can be automatically configured with an IPX address from an IPX router on the network The hub is preconfigured to enable this function Alternatively if you are using the hub in a network that uses the Internet Protocol IP you manually configure the hub with an IP address using the hub console s IP command See the IP command description in chapter 3 Operation and appendix D Network Addressing for more information on configuring a network layer address on the hub When configured with an IP address the hub can also send and respond to network layer test packets ICMP Echo Request or Ping packets Using Non HP Network Management To manage the HP EtherTwist Hub Plus and Hub Pl
13. devices and networks 2 8 diagnosing troubles 4 3 diagnostic tests 4 4 features 1 1 firmware enhancements 1 2 1 8 how it works 1 6 included parts 1 3 installation 2 1 mounting 2 5 network address 1 9 network addressing D 1 network management 1 8 operation 3 1 ports 1 1 power cord 1 3 remote management 1 2 specifications B 3 starting a console session 3 1 station address 1 2 status LEDs 1 4 troubleshooting 4 1 ICMP 3 7 IEEE 802 3 Type 10Base T 1 2 Induded parts 1 3 Installation 2 1 IP address 3 6 IP addresses D 2 IPX 3 5 IPX addressing D 1 Index 4 L LEDs 1 2 LEDs diagnosing with 4 3 LEDs status 1 4 Link beat 1 7 Linkbeat command 3 7 M MAC address 3 5 Modems C 1 Mounting brackets 1 3 Mounting the hub 2 1 Network address 1 9 Network addressing D 1 Network management 1 8 Network management non HP 1 9 Novell Netware D 1 O Operation 3 1 P Password command 3 7 Physical address 3 5 Ping 1 2 Ping command 3 7 POrt command 3 8 Ports 1 1 Ports connections 2 10 Ports testing 4 5 Power cord 1 3 Primary default router 3 6 Index 5 R Regulatory statements C 1 C 4 Remote management 1 2 Remote station address 3 3 REset command 3 8 RS 232 C console port 1 1 S Safety information C 1 Self test 1 2 specifications electromagnetic B 2 B 4 SP eed command 3 8 STatus command 3 9 Status LE
14. in chapter 1 ON REVERSED means that reversed wiring polarity on the receive pair has been detected on a twisted pair cable and the hub has compensated The link beat status of each twisted pair port OFF means link beat has been explicitly disabled NOT DETECTED means link beat is enabled but is not detected Note If a packet is received on a port with a missing link beat the port will be enabled for a short time This may cause its port LED toflash intermittently This field is blank if the port is disabled The station address of the device connected to each port or NONE meaning an address has not yet been detected A device must transmit packets to be detected MULTIPLE meaning more than one address has been detected Operation 3 9 TEstlink Torun atest of the link between the hub and another IEEE 802 3 device Note The destination device must be able to send an IEEE 802 2 Test response packet upon receipt of an IEEE 802 2 Test command packet You will be prompted for the 12 digit hexadecimal station address also called MAC address Ethernet address or physical address of the destination device You will then be prompted for the number of test packets to send If any errors are reported during this test there may be a fault on the link being tested or on the destination device For more information about testing network links see chapter 4 Troubleshooting THinwatch lt ON OFF gt To enable set to ON
15. management products Depending on the HP network management product you have you may be able to automatically monitor the status of the backup link from the network management station See your HP network management produc documentation for more information E 4 Backup Links Reactivating the Primary Link When the primary link is repaired you can use any of the following methods to reenable the primary port From the hub s console use the Port command POnON where n isthe primary port s ID m Cycle power on the hub This is useful if you do not have access to the hub s console interface for example because the hub is in a wiring closet and a console is not connected m Froman HP network management station reenable the port or reset the hub See the network management product documentation for details on how to enable a port or reset the hub When the primary port is reenabled the backup port is automatically disabled and returned to backup mode Backup Links E 5 Sample Topologies Following are two simple sample topologies that may give you some ideas on how a backup link could be used in your network Sample 1 EtherTwist Hub to EtherTwist Hub In this sample topology the primary and backup links consist of twisted pair cable segments between an HP EtherTwist Hub Plus 48 and an HP EtherTwist Hub Plus Wiring Closet 1 HP EtherTwist HP EtherTwist HP
16. or disable set to OFF Thinwatch on the ThinLAN port With Thinwatch enabled the Fault and ThinLAN port LEDs will flash whenever the ThinLAN port is auto segmented If you don t enable Thinwatch the LEDs won t flash Auto segmentation occurs on the ThinLAN port when it is enabled but has no connector on it the connected segment is not properly terminated or it experiences excessive collisions Segmentation of a twisted pair port or theAUI port is always displayed on the corresponding port LED and theFault LEDs See Auto Segmentation in chapter 1 The default setting is disabled to allow you to bench test the hub and not get a fault indication Enable Thinwatch if the ThinLAN port is being used disable Thinwatch if it is not being used Example TH ON This enables Thinwatch 3 10 Operation Troubleshooting Some of the hub console commands are used for the troubleshooting instructions in this chapter See Console Connection in chapter 2 for details on connecting to the console port See chapter 3 Operation for details on the console commands This chapter describes these topics wm basic troubleshooting tips m diagnosing with the LEDs m diagnostic tests testing the hub only testing the hub s ports and the links testing twisted pair cabling Basic Troubleshooting Tips m Makesurethat you have a valid network topology If you have trouble after a recent change to the network switch ba
17. or your local HP sales office for assistance HP part number 5062 3355 Thefollowing pins are connected m pin2topin3 Em pin4topin 5to pin 8 m m pin 6topin 20to pin 22 od m pin 7to pin 23 Cables and Connectors A 11 Specifications HP 28684B Hub 12 and HP 28688B Hub Plus Physical Dimensions 42 5 cm by 23 5 cm by 4 4 cm 16 8 in by 9 3 in by 1 7 in Weight 2 7 kg 6 0 Ib Electrical The HP 28684B and HP 28688B hubs automatically adjust to any voltage between 90 and 240 volts and any frequency between 50 and 60 Hz ac voltage 100 120 volts 200 240 volts Maximum current 0 5 amps 0 5 amps Frequency range 50 60 Hz 50 60 Hz Environmental Operating Non Operating Temperature 0 C to 55 C 40 C to 70 C 32 F to 131 F 40 F to 158 F Relative humidity 15 to 95 15 to 90 non condensing at 40 C 104 F at 65 C 149 F Maximum altitude 4 6 km 15 000 ft 4 6 km 15 000 ft Specifications B 1 Cable Interfaces m The50 pin twisted pair port is compatible with the IEEE 802 3 Type 10Base T standard m TheThinLAN port is compatible with the IEEE 802 3 Type 10Base2 standard TheAUI port is compatible with IEEE 802 3 standards m TheRS 232 C console port conforms to V 22 bis Electromagnetic Emissions FCC part 15 Class A in US Canada and Latic America CISPR 22 Class A EN 55022 Class A in Europe VCCI Class in J apan Immunity prEN 55101 2 1991 IEC 801 2 3 kV CD 8 kV AD
18. used for the backup link Enter the port ID see the Port command description for the port IDs Or enter 0 if you wish to remove an existing backup link configuration Primary Port The port used for the primary link Enter the port ID Remote Station The 12 digit hexadecimal station address of the hub at the remote Address end of the critical link Seconds Between How often you want the hub to send an IEEE 802 2 Test packet Test Packets to the remote hub over the primary link Consecutive Failures The number of consecutive Test packet response failures that will trigger activation of the backup link For example enter 5 to activate the backup link on the fifth failure The hub monitors the primary link by sending IEEE 802 2 Test packets at the specified frequency to the specified remote hub If n consecutive Response packets are not returned from the remote hub the primary port is disabled and the backup port is enabled When the primary link is repaired you must reenablethe primary port It is not automatically reenabled When the primary port is reenabled the backup port is disabled automatically and returned to backup mode See Reactivating the Primary Link in appendix E Backup Links Appendix E contains more information on backup links induding requirements limitations and sample topologies Operation 3 3 COunters To display counters for each port the global count for all ports and the time elapsed since they wer
19. utente finale Duranteil periodo di garanzia la Hewlett Packard o un Rivenditore autorizzato riparer o sostituir i prodotti che risultassero difettosi 2 Warranty Index A Accessories kit 1 3 Alignment errors 3 4 AUI ports 1 1 2 9 Auto segmentation 1 2 1 7 BAckup command 3 3 Backup default router 3 6 Backup link 1 2 Backup links E 1 Backup port 3 3 Baud rate 2 14 2 16 Broadcast packets 3 4 C Cable interfaces B 2 Cables and connectors A 1 Collision detection 1 6 Collisions 3 4 Configuration commands 2 17 Connecting a console 2 14 Connecting a modem and terminal 2 15 Connecting a terminal directly 2 14 Connecting computers 2 8 Connecting other hubs 2 9 connecting to a network backbone 2 8 Connecting to devices and networks 2 8 Connectors A 1 Consecutive failures 3 3 Console commands 3 2 Console connection 2 14 Console session 3 1 Index 1 COunters command 3 4 CRC errors 3 4 D Declaration of conformity C 2 Diagnosing with the LEDs 4 3 Diagnostic tests 4 4 Echo request packet 1 2 electromagnetic specifications B 2 B 4 Errors 3 4 Ethernet address 3 5 F Features 1 1 Firmware enhancements 1 2 1 8 G Giant packets 3 4 H HEIp command 3 2 How the hub works 1 6 HP 3 2 HP 28684B accessories kit 1 3 cable interfaces B 2 cables and connectors A 1 configuration commands 2 17 connecting a modem and terminal 2 15 connect
20. 25 pin male Zapin male Tx 2 ea 2 Tx Rx 5 8 Rx GND 7 7 GND 5 CTS 6 DSR 8 DCD 22 RI 23 DRS RS 232 C Crossover Cable for Terminal PC with 9 Pin Connector Minimum Pin Out aire iride Hub end en 3 9 pin female 2 pini male Tx 2 2 Tx Rx 3 PG 3 Rx GND 5 7 GND 5 CTS 6 DSR 8 DCD 22 RI 23 DRS Cables and Connectors A 9 RS 232 C Cable for HP 110 Minimum Pin Out HP110 end Hub end 9 pin male 25 pin male TX 2 E 2 TX Rx 3 3 Rx GND 7 7 GND 5 CTS 6 DSR 8 DCD 22 RI 23 DRS Null Modem Adapter use with a modem cable when connecting a terminal Minimum Pin Out Modem cable Hub end end 25 pin 25 pin female male 2 2 3 3 4 A 4 4 TER OR IET 6 6 87 8 20 20 7 7 DTR pin 20 and RTS pin 4 must be on or high on your terminal or in your terminal emulation program A 10 Cables and Connectors RS 232 C Modem Cable Minimum Pin Out Modem end Hub end 25 pin male 25 pin male Signal 2 2 TX 3 3 Rx 4 4 RTS 5 5 CTS 6 6 DSR VA GND 8 8 CD OR DCD 20 20 DTR 22 22 RI 23 23 DRS typically on V 24 European modems Console Port Loopback Connector The loopback connector shown below is useful for troubleshooting the console port on your HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 This connector is included in the HP Extended LAN Troubleshooting Kit product number HP 28689B or it can be purchased separately Contact your HP authorized LAN dealer
21. 2B Support Link HP 35031A Support Link II HP 50759A Support Link Hayes 1200 Smartmodem Racal Vadic Maxell 2400VP Hayes 2400 compatible Black Box V 32 9600 Baud 2 Configure the modem as described in appendix C Modem Configuration 3 Connect the modem to the console port using an RS 232 C modem cable For pin outs and recommended cables see appendix A Cables and Connectors 4 Attheremote site connect the terminal or PC emulating a terminal tothe remote modem Make sure the terminal and modems are functioning properly then establish the link between the terminal s modem and the hub s modem according to the modem instructions 5 Press RETURN several times for the prompt gt The baud rate for communication between the hub and the terminal is set automatically when you press RETURN Installation 2 15 If You Have Trouble with a Terminal or Modem Connection If you have connected a terminal or modem according to the previous instructions and you do not get a prompt after you have pressed RETURN several times then try the following procedures in sequence until you get the prompt 1 Connection Reset Procedure a b Detach then reattach the console or modem cable from the hub Press RETURN several times for the prompt 2 Cycle Power Procedure a b Cycle power on the hub by unplugging the power cord and plugging it in again When the power on self test is done press RETURN several times for the
22. 4D 1 meter thin AUI Male extension pin 4 not connected Connector m HP 92254A through H 6 meter through 48 meter thick AUI cables m HP 92254J 5 meter thin AUI cable pin 4 not connected Female Fa NERO On Connector S x 0 9 9 09 0 O Some longer cables may have all 15 pins wired SeethelEEE 802 3 standards document for definitions of the pins not shown here Cables and Connectors A 7 Console Connector and Cable Pin Outs The HP EtherTwist Hubs have a console port that automatically detects whether a terminal or a modem is connected No switch setting is required Because of this function a standard straight through cable can not be used when connecting a terminal directly For a terminal connection you use a crossover cable essentially a cable for connecting a printer to a serial port or a modem cable with a null modem adapter attached which provides the crossover function For a modem connection you can use a standard modem cable This section provides pin assignment information for the cables you can use on the hub s console port Pin Out for Hub s Console Port Connector PIN US CCITT DIN 1 CHS GND 101 2 Tx 103 D1 3 Rx 104 D2 4 RTS 105 S2 5 CTS 106 M2 6 DSR 107 M1 7 GND 102 8 CD 109 M5 20 DTR 108 S1 22 RI 125 M3 23 SR 111 A 8 Cables and Connectors RS 232 C Crossover Cable for Terminal PC with 25 Pin Connector Minimum Pin Out rod Hub end
23. Ds 1 4 Subnet mask 3 6 T Test packets 1 2 3 3 Testing ports and links 4 5 Testing twisted pair cabling 4 5 TEstlink command 3 10 ThinLAN ports 1 1 2 9 THinwatch command 3 10 Timeto live 3 6 Total packets 3 4 Troubleshooting 4 1 Twisted pair cabling testing 4 5 Twisted pair ports 1 1 2 9 W Warranty 1 1 Index 6 Regulatory Information The product described in this document complies with specific international regulations See the document section entitled Regulatory Statements for the applicable regulatory information Informations concernant la r glementation Le produit d crit dans le pr sent document satisfait a des normes internationales sp cifiques Pour plus de d tails sur les r glementations applicables reportez vous a la section Regulatory Statements Informationen uber Kontrollvorschriften Das in diesem Dokument beschriebene Produkt erf llt bestimmte internationale K ontrollvorschriften F r Informationen ber die zutreffenden Kontrollvorschriften lesen Sie bitte das Kapitel mit der berschrift Regulatory Statements Informazioni sulla regolamentazione Il prodotto descritto in questo documento conforme alle specifiche normative internazionali Vedere la sezione del documento intitolata Regulatory Statements per le informazioni sulle normative competenti Informacin reglamentaria El producto que se describe en este documento cumple con determinados reglamentos internacion
24. EtherTwist Hub 48 E 6 Backup Links primary link backup link Wiring Closet 2 HP EtherTwist Hub je gt A fell O ER d HP EN 10 10 LAN Bridge to another network HP EtherTwist Sample 2 Backup Link Using Alternative Medium In this topology the primary link consists of a twisted pair cable between twisted pair ports on a Hub Plus 48 and a Hub Plus the backup link is from AUI port to AUI port on the two hubs Depending on the type of transceivers used the backup link could use thin coax fiber optic cable or even twisted pair cable Notethat any of the network ports on thesehubs can function as a backup to any other port Wiring Closet 1 Wiring Closet 2 HP HP EtherTwist EtherTwist HUD p a E Hub Be gt gt O El E C l Je e un O HP HP amp EtherTwist 10 10 LAN Hub fee lt N fell Bridge ee gt D O El O to another network fa HP EtherTwist HP Hub 48 EtherTwist PEN Hub a A B primary link twisted pair cable A Se backup link thin coax fiber optic or t
25. HP EtherTwist Hub and Hub Plus Installation and Reference Guide Copyright Hewlett Packard Company 1992 All rights reserved Hewlett Packard Company makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material This document contains proprietary information which is protected by copyright No part of this document may be photocopied reproduced or translated into another language without the prior written consent of Hewlett Packard Theinformation contained in this document is subject to change without notice Print History Edition 1 March 1991 Edition 2 March 1992 Edition 3 J une 1992 Safety Considerations The product and related documentation must be reviewed for familiarization with safety markings and instructions before installation and operation See the documentation section entitled Safety Information Informations concernant la s curit Ce produit et la documentation s y rapportant devront tre tudi s avant l installation et l utilisation afin de se familiariser avec les symboles et instructions de s curit Reportez vous la section 4 nformations concernant la s curit Hinweis
26. This command also terminates the console session and disconnects the phone line if using a modem and resets the console port baud rate to be automatically sensed To restart the console session reestablish the phone link if used then press RETURN several times for the prompt SPeed lt new speed gt To change the console port baud rate Normally the baud rate is automatically sensed Use this command to set the baud rate explicitly to 300 1200 2400 or 9600 You will be prompted to set the terminal s baud rate to the same speed and to press RETURN several times for the prompt 3 8 Operation STatus lt port group gt To display status information for the hub including the time elapsed since the last reset see the Reset command the hub s station address the Thinwatch setting and a table with the following port information For the Hub 12 and Hub Plus do not specify a port group For the Hub Plus 48 the port group parameter is a letter A B C or D If no port group is specified all ports will be displayed Port Port Status Link Beat Station Address The port ID For the HP 28688B and HP 28699A BKUP indicates the port is configured as the backup link PRI indicates the port is the primary link The status of each port ON means the port is enabled and is not auto segmented OFF means the port has been explicitly disabled SEGMENTED means the port has been auto segmented See Auto Segmentation
27. able nt rfaces sar esu e alm ch a aval soe PSE dt rd rio Electromagnetic gt a em dou ue anne Re ROW RUIT EE Datacomm Declarations Modem Configuration HP 35031A SupportLinkll o e HP 50759A Support Link HP 37212B Support Link Black Box V 32 9600 Async 2 2 llle Hayes 1200 Smartmodem for both 8 and 10 switch units Racal Vadic Maxell 2400 VP Hayes 2400 Compatible Network Addressing HP 28688B and HP 28699A Only IPX Addressing for Novell NetWare IPX Addressing Notes IP Addresses for IP andNon IP Networks Using Assigned IP Addresses Building Your Own IP Addressing Scheme Example Addressing Scheme E Backup Links HP 28688B and HP 28699A Only Description it Soke aon BE ROR RM P ROS EC A AS E 1 Eimitations 5 Pa tag a al Le E 2 Additional Notes E 2 Configuring a Backup Link E 3 Identifying the Backup Link E 4 Indications of Backup Link Activation E 4 ReactivatingthePrimaryLink rns E 5 Sample Topologies E 6 Sample 1 EtherTwist Hub to EtherTwist Hub E 6 Sample 2 Backup
28. ales En cuanto a la informaci n reglamentaria correspondiente ver la secci n del documento titulada Regulatory Statements U HEWLETT PACKARD Printed in U S A 5090 2692 E0692
29. allation 2 11 ThinLAN Port 1 Attach athin LAN cable section to one side of a BNC T connector 2 Attach another thin LAN cable section or a 50 ohm terminator to the other side of the T connector 3 Attach the T connector tothe ThinLAN port Teen Thin LAN Thin LAN sion BNC T Nes terminator cable cable cable BNC T a IE mid cable end of cable attachment OR f attachment mmm fal i ThinLAN port on hub ThinLAN port on hub 4 FoldtheBNC T connector cover around the connection and squeeze the surfaces together around the edges BNC T connector cover Xo 29 RL ee SR Ds SKE a RL K s Men na RL cee ds 0 ase X900 00000 E 00 SR x RL oe RR RA use ue lt lt M lt lt ee ne so s n Ss x ve lt lt SS X 2 3 e a vo w eS lt lt n oes SS SR n ue vo x vo SS 2 eS gt e thin LAN cable Note Each thin LAN cable segment must be terminated with a 50 ohm terminator at each end In the illustration above showing the ThinLAN port at the end of a cable segment the 50 ohm terminator is attached to one side of the BNC T connector 2 12 Installation AUI Port Caution Do not touch the hub connector pins or the cable connector pins Static Note discharge may damage the equipment
30. an Quality Manager Regulatory Statements 3 DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN45014 Manufacturer s Name Hewlett Packard Company Manufacturer s Address 8000 Foothills Blvd Roseville CA 95678 U S A declares that the product Product Name EtherTwist Hub Plus 48 Model Number HP 28699A conforms to the following Product Specifications Safety EN 60950 IEC 950 EMC EN 55022 1991 CISPR 22 class A prEN 55101 2 IEC 801 2 3 kV CD 8 kV AD prEN 55024 3 IEC 801 3 DRAFT 3 V m Supplementary Information None Roseville February 6 1992 LA a Asa E 4 p VU Sandra L Sheehan Quality Manager ae i 4 Regulatory Statements One Year Limited Hardware Warranty Hewlett Packard warrants this computer hardware product against defects in materials and workmanship for a period of one year from receipt by the end user If HP receives notice of such defects during the warranty period HP will at its option either repair or replace products that prove to be defective Should HP be unable to repair or replace the product within a reasonable amount of time Customer s alternative exclusive remedy shall be a refund of the purchase price upon return of the product Exclusions The above warranty shall not apply to defects resulting from improper or inadequate maintenance by customer customer supplied software or interfacing unauthorized modification or misuse operation outsi
31. auptstromquelle zu den Gerateingabeterminals den Netzkabeln oder dem mit Strom belieferten Netzkabelsatz voraus Sobald Grund zur Annahme besteht daf der Schutz beeintrachtigt worden ist das Netzkabel aus der Wandsteckdose herausziehen bis die Erdung wiederhergestellt ist F r LAN Kabelerdung m Wenn Ihr LAN ein Gebiet umfa t das von mehr als einem Stromverteilungssystem beliefert wird m ssen Sie sich vergewissern da die Sicherheitserdungen fest untereinander verbunden sind m LAN Kabel k nnen gelegentlich gef hrlichen bergangsspannungen ausgesetzt werden beispielsweise durch Blitz oder St rungen in dem Starkstromnetz des E lektrizit tswerks Bei der Handhabung exponierter Metallbestandtei le des Netzwerkes Vorsicht walten lassen Dieses Gerat enthalt innen keine durch den Benutzer zu wartenden T eile Wartungs Anpassungs Instandhaltungs oder Reparaturarbeiten d rfen nur von geschultem B edi enungspersonal durchgef hrt werden Dieses Gerat hat keinen Netzschalter es wird beim Anschliefsen des Netzkabels eingeschaltet Hinweise zur Sicherheit 3 Considerazioni sulla sicurezza Simboli di sicurezza simbolo fare riferimento alla documentazione sul prodotto per ulteriori informazioni su di esso Simbolo di riferimento alla documentazione Seil prodotto contrassegnato da questo PERICOLO La dicitura PERICOLO denota un pericolo che pu causare lesioni o morte ATTENZIONE Ladidtura ATTENZIONE denata un pericolo
32. che pu danneggiare le attrezzature Non procedere oltre un avviso di PERICOLO odi ATTENZIONE prima di aver compresole condizioni di rischio e aver provveduto alle misure del caso Questo prodotto omologato nella classe di sicurezza I ed ha un terminale protettivo di collegamento a terra Dev essere installato un collegamento a terra di sicurezza non interrompibile che vada dalla fonte d alimentazione principale ai terminali d entrata al cavo d alimentazione oppure al set cavo d alimentazione fornito con il prodotto Ogniqualvolta vi sia probabilit di danneggiamento della protezione disinserite il cavo d alimentazione fino a quando il collegamento a terra non sia stato ripristinato Per la messa a terra dei cavi LAN m selavostra LAN copre un area servita da pi di un sistema di distribuzione elettrica accertatevi che i collegamenti a terra di sicurezza siano ben collegati fra loro m icavi LAN possono occasional mente andare soggetti a pericolose tensioni transitorie ad esempio provocate da lampi o disturbi nella griglia d alimentazione della societ elettrica siate cauti nel toccare parti esposte in metallo della rete Nessun componente di questo prodotto pu essere riparato dall utente Qualsiasi lavoro di riparazione messa a punto manutenzione o assistenza va effettuato esdusivamente da personale specializzato Questo apparato non possiede un commutatore principale si mette scotto tensione all inserirsi il cavo d alimentazi
33. ck to the previous topology If you no longer have trouble the new topology is probably at fault Topology faults may be due to excessive cable lengths or excessive repeater delays between nodes For configuration guidelines see the HP EtherTwist Technical Reference Guide part number 5091 3237E m Makesurethat the hub is plugged in and that cable connections are secure m ftheThinLAN port is being used make sure that the port is properly terminated See ThinLAN Port Connection in chapter 2 Troubleshooting 4 1 Basic Troubleshooting Tips continued If the ThinLAN port is not being used make sure that Thinwatch is disabled If Thinwatch is enabled on an unused ThinLAN port the hub will operate but the Fault LED will flash Usethe console s Thinwatch command Make sure link beat is set correctly on each twisted pair port See Link Beat in chapter 1 If link beat is set incorrectly it may cause intermittent flashing of the port s LED on the hub and poor network performance for the device connected to the port Usethe console s Status command to check link beat status and the Linkbeat command to turn link beat on or off If a transceiver is connected to the AUI port of the hub make sure its switches are correctly set according to its instructions Makesurethe SQE test is disabled If the console port does not work see Console Connection in chapter 2 For the HP 28688B and HP 28699A only if you are using IP commu
34. ction A 4 Twisted Pair Crossover Cable for Hub to Hub Connection A 5 Twisted Pair Cable Pin Assignments A 6 Twisted P air Straight Through Cable A 6 Twisted Pair Crossover Cable A 6 Thin LAN Cable Requirements A 6 AUT Cables eese Lee dun e ec MERE IR ar we ur ec an aS A 7 Console Connector and Cable Pin Outs Pin Out for Hub s Console Port Connector RS 232 C Crossover Cable for Terminal PC with 25 Pin Connector RS 232 C Crossover Cable for Terminal PC with 9 Pin Connector RS 232 C Cable for HP 110 Null Modem Adapter use with a modem cable when connectingaterminal RS 232 C Modem Cable Console Port Loopback Connector Specifications HP 28684B Hub 12 and HP 28688B HubPlus PHYSICA a LE TT Electrical sure ii ea BE ei i Environmental alta a aa art woe Aus RENT Cablelnterfaces Electromagnetic Datacomm Declarations HP 28699A Hub PIus 48 Physical AE Sgr a Eh ares Gone ns an Electrical 4 4 Sti deb aan M GR aan Ae ae bed ab Ans fa at Environmental 00 u Lite ae Lx ul ERR Ce Bac EUR Pa RAT C
35. cts do not have a power switch they are powered on when the power cord is plugged in Safety Information 1 Informations concernant la s curit Symboles de s curit Symbole de r f rence a la documentation Si le produit est marqu de ce symbole A reportez vous a la documentation du produit afin d obtenir des informations plus d taill es AVERTISSEMENT Dans la documentation un AVERTISSEMENT indique un danger susceptible d entra ner des dommages corporels ou la mort ATTENTION Un texte de mise en garde intitul ATTENTI ON indique un danger susceptible de causer des dommages l quipement Ne continuez pas au del d une rubrique AVERTISSEMENT ou ATTENTION avant d avoir bien compris les conditions pr sentant un danger et pris les mesures appropri es Cet appareil est un produit de dassel et poss de une borne de mise la terre La source d alimentation principale doit tre munie d une prise de terre de s curit install e aux bornes du c blage d entr e sur le cordon d alimentation ou le cordon de raccordement fourni avec le produit Lorsque cette protection semble avoir t endommag e d brancher le cordon d alimentation jusqu ce que la mise la terre ait t r par e Mise la terre du c ble de r seau local W si votre r seau local s tend sur une zone desservie par plus d un syst me de distribution de puissance assurez vous que les prises de terre de s curit soient convenabl ement interco
36. de of the environmental specifications for the product or improper site preparation and maintenance Warranty Limitations HP makes no other warranty either expressed or implied with respect to this product HP specifically disclaims the implied warranties of merchantability and fitness for a particular purpose Some states or provinces do not allow limitations on the duration of an implied warranty so the above limitation or exclusion might not apply to you However any implied warranty of merchantability or fitness is limited to the one year duration of this written warranty This warranty gives you specific legal rights and you might also have other rights which vary from state to state or province to province Exclusive Remedies The remedies provided herein are Customer s sole and exclusive remedies In no event shall HP be liable for any direct indirect special incidental or consequential damages whether based on contract tort or any other legal theory Some states or provinces do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion might not apply to you Third Party Products HP designed the hubs to operate with industry standard hardware and software products Warranty 1 HP has conducted limited testing with certain non HP products to determine compatibility with the hubs Please contact your HP authorized LAN dealer or HP representative for the current list of te
37. e last reset with the Reset command Total Packets The total number of packets and fragments received Collisions The number of times the port was involved in a collision A single collision will be counted by all ports involved so the total collision count may be less than the sum of the port counts CRC Errors The number of packets with invalid Cyclic Redundancy Checksums CRCs The CRC is a calculated value used to check the validity of each packet Alignment Errors The number of incorrectly aligned packets Giant Packets The number of packets larger than 1518 bytes Broadcast Packets Thenumber of packets addressed to station address FFFFFF FFFFFF Note that counter values may be approximate under heavy network traffic consisting of small packets For the error counters depending on the type of error the number of the associated port may not be known In this situation the error is recorded in the global count only Disconnect To terminate the console session and reset the console port baud rate to be automatically sensed The command also disconnects the phone link if you accessed the console using modems 3 4 Operation IPconfig HP 28688B and HP 28699A Only To set IP configuration parameters on the hub Use this command if you wish the hub to be accessible using IP thelnternet Protocol If either of the following is true you must set the IP configuration parameters on the hub m Thehub will be managed remotely wi
38. e network by HP network management products and any other network management products that comply with the Simple Network Management Protocol SNMP standard The communication between the SNMP network management station and the hub takes place using the network layer protocols I PX for Novell networks or IP for TCP IP networks Which protocol you use depends on the protocol being used by the network management station Additionally if the network management station is on the other side of a router from your hub the protocol you run on both the hub and the network management station depends on which protocol the router can handle The network layer communications require that the hub have a network layer address This appendix provides some background information on I PX and IP addressing IPX Addressing for Novell NetWare The Novell NetWare network operating system uses a proprietary protocol called Internetwork Packet Exchange IPX ThelPX protocol firmware is always available on the HP EtherTwist Hub Plus and Hub Plus 48 it becomes active when the hub gets an IPX address ThelPX address consists of a network number and a device identification The address is automatically assigned to the hub as follows no IPX configuration of the hub is necessary m Thenetwork number is automatically assigned by a router or file server on the network that is running the PX protocol m Thedevice identification is merely the hub s station address als
39. e zur Sicherheit Sehen Siesich das Produkt an und lesen Sie die begleitende Dokumentation damit Sie vor der Installation und dem Betrieb mit den Sicherheitsmarkierungen und Anleitungen vertraut sind Bitte lesen Sie das Kapitel mit der berschrift Hinweise zur Sicherheit Considerazioni sulla sicurezza Esaminare il prodotto e la relativa documentazione per familiarizzarsi con gli avvisi eleistruzioni di sicurezza prima dell installazione e dell uso Vedere la sezione di questo documento intitolata Considerazioni sulla sicurezza Consideraciones sobre seguridad Antes de instalar y hacer funcionar el producto se deben estudiar el producto y la documentaci n relacionada a fin defamiliarizarse con las indicaciones de advertencia e instrucciones Ver la secci n del documento titulada Consideraciones sobre seguridad HP 28684B Hub 12 HP 28688B Hub Plus HP 28699A Hub Plus 48 HP EtherTwist Hub and Hub Plus Installation and Reference Guide U HEWLETT PACKARD HP Part Number 5090 2692 Printed in U S A J une 1992 Edition 3 E0692 What Is In This Guide This guide contains information to help you install configure and troubleshoot your HP 28684B EtherTwist Hub 12 HP 28688B EtherTwist Hub Plus and HP 28699A EtherTwist Hub Plus 48 The guide is organized as follows Chapter 1 provides a brief introduction to the hubs It describes important product features what you should have received with your hub and an overvie
40. ere each X is an integer between 1 and 255 The integers are separated by decimal points For a given network with its own class C addressing scheme the first three integers of each address must be the same The fourth integer must be unique for each addressed device Do not use 0 or 255 in the fourth position They are reserved integers For three hubs and an HP network management station on the network the class C addresses might be management station 192 1 1 1 first hub 192 1 1 10 second hub 192 1 1 11 third hub 192 1 1 12 See Pconfig in chapter 3 for the IP configuration procedures and descriptions of the parameters D 4 Network Addressing Backup Links HP 28688B and HP 28699A Only Description In some network configurations a critical link exists for example between two workgroups that regularly share or exchange data over the network To maintain the integrity of such a critical link the HP EtherTwist Hub Plus and Hub Plus 48 offer a backup link feature A backup link is a separate cable run between two hubs that is automatically enabled if the connection designated as the primary link fails 802 2 test packets primary link hub A l A4 lt lt ese hub B 802 2 response packets monitoring remote hub hub backup link normally inactive The hub on which the redundant link is confi
41. ermit tently ona port in use Check cabling on the port indicated Use the Status console command to check if The port has been manually turned off In this case turn the port back on Link beat is expected but not detected link beat missing In this case be sure cable is plugged in and check link beat settings See Link Beat in chapter 1 Use the console s Linkbeat command to turn link beat on or off This LED is not important for the diagnosis Troubleshooting 4 3 Diagnostic Tests Testing the Hub Only Choose one of the following procedures to test the hub s internal circuitry The first is the most complete internal test The hub s ports are not tested with the following procedures see the next page to test the ports m Cycle power on the hub by unplugging the power cord and then plugging it in This causes the hub to test itself All LEDs should go ON momentarily before returning to their operational states If all do not go ON an LED may be burned out or the hub is faulty If the Fault LED on the front or back of the hub stays ON the hub is faulty and must be replaced Connect a console to the hub Use the console s Reset command which causes the hub to test itself All LEDs should go ON momentarily before returning to their operational states If all do not go ON an LED may be burned out or the hub is faulty If the Fault LED on the front or back of the hub stays ON the hub is faul
42. gured hub A in the illustration is responsible for monitoring the link It sends IEEE 802 2 Test packets to the remote hub hub B in the illustration and looks for response packets from that hub If the response packets fail to come back the primary link is considered as having failed and the backup link which had not been carrying any traffic is enabled automatically If the primary link does fail it is automatically disabled until it can be repaired and reenabled When the primary link is repaired you must reenablethe primary port It is not reenabled automatically When the primary port is enabled the backup port is automatically disabled and returned to backup mode See Reactivating the Primary Link later in this appendix Backup Links E 1 Limitations Each hub can monitor a single backup link only one backup link can be configured on each hub But the hub may be at the remote end of one backup link and at the monitoring end of a backup link to a different hub m A given hub should be connected to the remote end of no more than two backup links If it is functioning as the remote hub in more than two backup links it may not be able to respond to the test packets fast enough when there is a high level of data traffic on the network segments This limit may be exceeded by increasing the time between test packet transmissions on the monitoring hubs For all the backup links in which the remote hub is involved the time config
43. ing computers 2 8 connecting to a network backbone 2 8 connecting to devices and networks 2 8 console commands 3 2 diagnosing troubles 4 3 diagnostic tests 4 4 features 1 1 Index 2 firmware enhancements 1 2 1 8 how it works 1 6 included parts 1 3 installation 2 1 mounting 2 1 network address 1 9 operation 3 1 ports 1 1 power cord 1 3 specifications B 1 starting a console session 3 1 station address 1 2 status LEDs 1 4 testing ports and links 4 5 troubleshooting 4 1 HP 28688B accessories kit 1 3 backup links E 1 cable interfaces B 2 cables and connectors A 1 configuration commands 2 17 connecting a modem and terminal 2 15 connecting computers 2 8 connecting to a network backbone 2 8 connecting to devices and networks 2 8 diagnosing troubles 4 3 diagnostic tests 4 4 features 1 1 firmware enhancements 1 2 1 8 how it works 1 6 included parts 1 3 installation 2 1 mounting 2 1 network address 1 9 network addressing D 1 network management 1 8 operation 3 1 ports 1 1 power cord 1 3 remote management 1 2 specifications B 1 starting a console session 3 1 station address 1 2 status LEDs 1 4 Index 3 troubleshooting 4 1 HP 28699A accessories kit 1 3 backup links E 1 cable interfaces B 3 cables and connectors A 1 configuration commands 2 17 connecting a modem and terminal 2 15 connecting computers 2 8 connecting to a network backbone 2 8 connecting to
44. les and Connectors A 1 HP Cables Port Type on Cable Cable Type Terminal HP Product Number Function PC or Modem Connecting to the network Connecting Twisted pair 92214W 6 inch Crossover Cable hub to hub crossover cable a Unshielded 5 92268A B C D or N 4 pair twisted pair cable 92214R S or T 25 pair computer _ IEEE Type 92214U 0 5 meter ibi 10Base2 Thin indudes a BNC T connector and coaxial cable one 50 ohm terminator f 92264D 1 meter connedinga 92254A through H transceiver to AUI cable the AUI port o TAI P 92254 5 meters Connecting to the console port 25 pin female 13242Gt 40242Gt Connect a i terminal or PC RS 232 C 25 pin male 13242H to the console Crossover cable 9 pin male 24542GT por 9 pin female B t for HP 110 72221P Connect a modem to the console port Straight through RS 232 C modem cable 25 pin female 13242M 13242N 17355M 25 pin male 31391A An AUI cable is not necessary with some transceivers such as the HP 28685A or HP 28685B EtherTwist Transceivers the HP 28641B ThinLAN Transceiver and the HP 28683A Fiber Optic Transceiver These transceivers can be attached directly tothe AUI port of a network device t For these cables the signals DTR pin 20 and RTS pin 4 must be on or high on your terminal or in your terminal emulator A 2 Cables and Connectors Othe
45. lue is automatically generated and depends on the class of IP address that has been entered See your network administrator for the subnet mask used by all devices on your IP network ThelP address of the nearest IP router in your network The default value is 0 0 0 0 If no IP routers are in your network enter the address of a network management station if any TheIP address of the router used in place of the primary default router when it is inaccessible The default value is 0 0 0 0 If there is no backup router or no primary default router use 0 0 0 0 The number of IP routers a packet is allowed to cross before the packet is discarded The default value is 32 Increasethis value if the hub will be sending IP packets to a destination that is more than 32 routers away The maximum is 255 See your network administrator for these IP settings See appendix D for information on setting the IP address At the end of the process of changing the IP configuration the hub will be reset This terminates the console session and disconnects the phone line if using a modem and resets the console port baud rate to be automatically sensed Torestart the session when the reset process completes press RETURN several times for the prompt 3 6 Operation Linkbeat lt port gt lt ON OFF gt To enable set to ON or disable set to OFF link beat on a port The default setting is enabled ON Disable link beat on any twisted pair port that i
46. mber of packets to send m thetimeout value the number of seconds to wait for a response If any errors are reported during this test there may be a fault on the path used during the test or on the destination device For more information about testing network links see chapter 4 Troubleshooting Operation 3 7 POrt lt port gt lt ON OFF gt To enable set to ON or disable set to OFF a hub port The initial setting for all ports is enabled ON To simplify network changes unused ports need not be disabled You can use the Status command to check all the ports The lt port gt parameter can be m atwisted pair port number from 1 to 12 for the Hub 12 and Hub Plus and from 1 to 12 preceded by a group number for the Hub Plus 48 for example B3 is port 3 in group B a twisted pair port group number A B C or D Hub Plus 48 only AUI or AU for the AUI port THINLAN or TH for the ThinLAN port ALL or AL for all ports Example for the Hub 12 or Hub Plus PO 1 OFF This disables port 1 Example for the Hub Plus 48 PO A1 OFF This disables port Al REset Torun a hub self test and reset the hub This command also resets all the network statistic counters and the time since last reset to O see the Counters command The current configuration is unchanged The hub is not accessible from network management software while it is being tested but it continues to repeat data If the hub is faulty the Fault LED will stay on
47. mmission Radio Frequency Interference Statement Warning This equipment generates uses and can radiate radio frequency energy If it is not installed and used in accordance with the instruction manual it may cause interference to radio communications It has been tested and found to comply with the limits for a Class A computing device pursuant to Part 15 of FCC Rules which are designed to provide reasonable protection against such interference when operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference If this equipment causes interference to radio reception which can be determined by unplugging the power cord from the equipment try these measures Reorient the receiving antenna Relocate the equipment with respect tothereceiver Plug the equipment and receiver into different branch drcuits Consult your dealer or an experienced technician for additional suggestions VCCI Class 1 For J apan Only CORB TRAZA CR LR ERIC dl CHA SSN ER RI CB Lae HU CO REL A Be Ufc SS ee SES A ERE eae VCCI EIE S Lcd 0E ET FERHERETOBRLIHBR TEN FF 3 27 4 FUREY a VRERETIZEHFAHSABZLEN BEN ESF DURA Bic tho TELUBROMROUEZLTFEAL Regulatory Statements 1 Declaration of The following Declarations of Conformity for the HP 286848 Conformity HP 28688B
48. nications make sure your IP configuration parameters are set correctly Use the console s IP config command Check LEDs For descriptions see Back of the Hub in chapter 1 When power is cyded all LEDs should go ON momentarily and then go into their normal operational states If all LEDs do not go ON an LED may be burned out or the hub is faulty and must be replaced Whenever you suspect a burned out LED cycle power by unplugging the hub and then plugging it in then check the LEDs immediately When the hub is operating LED patterns that indicate a hub or network problem are shown in the table on the next page 4 2 Troubleshooting Diagnosing With the LEDs LED patterns indicating problems Diagnostic Tips Power Collision Fault Port OFF x T Check power cord and power source If OK replace the hub Ver Very frequent collisions could indicate a fr Le network fault or a cable not properly i a ER 4 i terminated or SQE test not disabled If link ON y beat is not enabled on unused twisted pair ports crosstalk may be causing the problem x x ON A hub hardware failure was detected during self test Replace the hub Flashing Flashing A port has been auto segmented because of too many collisions on a ThinLAN port not properly terminated or not connected Check cable terminations connections SQE test setting transceivers and attached network devices OFF OFF or flashing int
49. nnect es m Les c bles de r seaux locaux peuvent occasionnellement tre soumis des surtensions transitoires dangereuses telles que la foudre ou des perturbations dans le r seau d alimentation public Manipulez les composants m talliques du r seau avec pr cautions Aucune pi ce contenue l int rieur de ce produit ne peut tre r par e par l utilisateur Tout d pannage r glage entretien ou r paration devra tre confi exclusivement un personnel qualifi Cet appareil ne comporte pas de commutateur principal la mise sous tension est effectu e par branchement du cordon d alimentation 2 Informations concernant la s curit Hinweise zur Sicherheit Sicherheitssymbole Symbol fur Dokumentationsverweis Wenn das Produkt mit diesem Symbol markiert ist A schlagen Sie bitte in der Produktdokumentation nach um mehr Informationen ber das Produkt zu erhalten VORSICHT Eine VORSICHT in der Dokumentation symbolisiert eine Gefahr die Verletzungen oder sogar Todesf lle verursachen kann ACHTUNG ACHTUNG in der Dokumentation symbolisiert eine Gefahr die das Ger t besch digen kann Fahren Sie nach dem Hinweis VORSI CHT oder ACHTUNG erst fort nachdem Sie den Gefahrenzustand verstanden und die entsprechenden Ma nahmen ergriffen haben Dies ist ein Ger t der Sicherheitsklassel und verf gt ber einen sch tzenden Erdungsterminal Der Betrieb des Gerats erfordert eine ununterbrochene Sicherheitserdung von der H
50. number 10 32 screws instead available as p n 2680 0302 Make sure you have screws that fit your cabinet or rack before mounting the hub Installation 2 5 For Wall Mounting Using a Phillips cross head screwdriver attach the mounting brackets to the hub with 10 mm M4 screws included in the accessories kit with the hub Then attach the hub to a wood surface minimum 44 inch plywood or equivalent with inch number 12 wood screws or equivalent not included Flat on wall 10 mm M4 screws Straight out from wall For Table Mounting Attach the self adhesive rubber feet to the four corners of the bottom of the hub Set the hub on a table near a power source 2 6 Installation 2 Plug in the hub and verify its operation 1 Plug the power cord into the hub s power socket and into an ac power source Note that the hub does not havea power switch the hub is powered on when the power cord is plugged in The HP EtherTwist hubs have a power supply that automatically adjusts to any ac power source that provides between 90 and 240 volts No voltage range setting is necessary 2 Check the LEDs on the hub s back panel When you plug in the hub it executes a self test and illuminates all the LEDs for approximately ten seconds At the end of the self test you should see the following LED pattern The Power LED is ON TheFault LED is OFF Di
51. o AT amp T 258A not USOC See Twisted Pair Cable Pin Assignments later in this chapter for a listing of the signals used on each pin Straight through cable 12345678 12345678 a 4 AA ME E PON E i i white orange 1 i E TE rem CA Vs orange white 1 i white green rl AAA i Note Pins 1 and 2 must be wired to a twisted pair Pins 3 and 6must be wired to a twisted pair Pins 4 5 7 and 8 are not used in this application although they may be wiredin the cable A 4 Cables and Connectors Twisted Pair Crossover Cable for Hub to Hub Connection For wiring between two hubs the transmit and receive pairs must be reversed The twisted pair wires must be twisted through the entire length of the cable See Twisted Pair Cable Pin Assignments later in this chapter for a listing of the signals used on each pin hub 2 end hub 1 end Crossover cable 12345678 12345678 white orange iz E orange white Ae i ae ied white green dd green white Note Pins 1 and 2 on the hub 1 end must be wired through a twisted pair to pins 3 and 6 on the hub 2 end Pins 3 and 6 on the hub 1 end must be wired through a twisted pair to pins 1 and 2 on the hub 2 end Pins 4 5 7 and 8 arenot used in this application although they may be wired in the cable straight through crossover cable ER in line adapter A short cros
52. o known as the MAC address Ethernet address or physical address This address is a unique 12 digit hexadeci mal number assigned to the hub at the factory Network Addressing D 1 IPX Addressing Notes Because the IPX address is assigned automatically no IPX configuration is necessary no PX configuration is provided on the hub console interface By default the hub is ready to be managed by an SNMP network management station that is configured for IPX communications m f your hub is part of a network that is running I PX only you do not need to perform the P configuration IP Addresses for IP and Non IP Networks If you have chosen to manage your hub with an SNMP IP network manager your hub must be configured with an IP address If your network will be connected with other networks that use IP addresses you must use assigned IP addresses Otherwise you can build your own IP addressing scheme described on the next page Using Assigned IP Addresses Hewlett Packard strongly recommends that if you intend to expand integrate or connect your network to other networks you use an assigned IP address There is a formal process to assign unique IP addresses to networks worldwide DDN Network I nformation Center in Menlo Park California is in charge of assigning IP addresses Contact the DDN Network Information Center by phone or mail They will provide instructions and the necessary documents to assign and register your IP addre
53. odem Connection 2 16 Configuration Commands 2 17 Operation Starting the ConsoleSession 3 1 Console CommandsHP 28699A console commands 3 2 HEIDEN ad 3 2 HEIp commands lio fdr ae a e Ta E m et are SOS 3 2 BAckup HP 28688B and HP 28699A Only 3 3 GOUNLErS Ace derit di a da 3 4 DISCONNECE iii a e e A oe a ESSE S 3 4 IP config HP 28688B and HP 28699A Only 3 5 PAssword HP 28688B and HP 28699A Only 3 7 Ping HP 28688B and HP 28699A Only 3 7 POrt lt port gt lt ON OFF gt LL 3 8 RESET Le ne ti ve IE a ae es ee Bate ace rem apr 3 8 SPeed new speed gt 3 8 STatus lt port group gt 2 2 3 9 TFESUINK AT i A fetes feat ca MEN rada me 3 10 THinwatch lt ON JOFF gt ees 3 10 Troubleshooting Basic Troubleshooting Tips 4 1 Diagnosing With the LEDS aaa aaa 4 3 Diagnostic Tests nato ais ee A ae x dr ma 4 4 Testing the Hub Only 4 4 Testing the Hub s Ports andtheLinks 45 Testing Twisted Pair Cabling 4 5 Cables and Connectors HP Cables anae Ma dale e od fert ne ao Ue ae A 2 Other Standard Cables A 3 Twisted Pair Cable Connector Pin Outs A 4 Twisted Pair Cable for Hub to Computer Conne
54. on anywhere on the network See your HP network management product documentation for more information Starting the Console Session To start the console session 1 Makesurea console is connected and configured as described in Console Connection in chapter 2 of this manual 2 Press RETURN for the prompt The console session prompt is gt You may have to press RETURN several times while the hub automatically senses the terminal s communication baud rate The console session starts with a display like the following the actual version numbers may be different and the Hub Plus 48 has the label 48 port 10Base T hub 12 port 10Base T hub HW A 01 00 ROM A 01 02 EEPROM D 01 00 Enter HE for help Operation 3 1 Console Commands HP 28699A console commands Enter at least the first two letters of a command to execute it such as HE for the Help command The Help command displays a screen like the following listing all commands Note that the BAckup I Pconfig PAssword and PI ng commands are not displayed for the HP 28684B Hub 12 12 port 18Base T hub Enter the first tuo characters to execute a command HElp display this list of hub commands HElp lt command gt display detailed help for specified command BAckup configure a backup link to another hub COunters display packets collisions and errors DIsconnect terminate this console session IPconfig configure Internet Protocol parameters LInkbeat
55. one 4 Considerazioni sulla sicurezza Consideraciones sobre seguridad Simbolos de seguridad S mbolo de referencia a la documentaci n Si el producto va marcado con este A s mbolo consultar la documentaci n del producto a fin de obtener mayor informaci n sobre el producto ADVERTENCIA Una ADVERTENCIA en la documentaci n se ala un riesgo que podr a resultar en lesiones ola muerte PRECAUCION Una PRECAUCION en la documentaci n se ala un riesgo que podr a resultar en aver as al equipo No proseguir despu s de un s mbolo de ADVERTENCIA o PRECAUCION hasta no haber entendido las condiciones peligrosas y haber tomado las medidas apropiadas Este aparato se enmarca dentro de la clase de seguridad y se encuentra protegido por una borna de puesta a tierra Es preciso que exista una puesta a tierra continua desde la toma de alimentaci n el ctrica hasta las bornas de los cables de entrada del aparato el cable de alimentaci n o el juego de cable de alimentaci n suministrado Si existe la probabilidad de que la protecci n a tierra haya sufrido desperfectos desenchufar el cable de alimentaci n hasta haberse subsanado el problema Puesta a tierra del cable de la red local LAN m Si laLAN abarca un rea cuyo suministro el ctrico proviene de m s de una red de distribuci n de electricidad cerciorarse de que las puestas a tierra est n conectadas entre s de modo seguro m Es posible quelos cables dela LAN se vean sometido
56. onfigured IPconfig HP 28688B and HP 28699A only Configures the hub to enable communication with a network management station using the Internet Protocol IP IP communications disabled Enables or disables linkbeat on specific twisted pair port Linkbeat enabled You must disable linkbeat on every Ek pest twisted pair port connected to a non 10Base T device Port Enables or disables specific hub ports All ports enabled Enables or disables Thinwatch If Thinwatch disabled Thinwatch Thinwatch is enabled the Fault LEDs and ThinLAN port LED will flash if the ThinLAN port becomes segmented Note Other console commands allow you to monitor the hub s activity and to diagnose hub and network problems See chapter 3 Operation for console command details You can also receive information about a command at the console prompt by entering HE the Help command followed by the first two characters of the command for example HE PO for help on the Port command Installation 2 17 Operation The HP 28684B EtherTwist Hub 12 HP 28688B Hub Plus and HP 28699A Hub Plus 48 are designed to operate unattended A console interface is provided with these hubs if you wish to customize their configuration monitor their activity or run diagnostics For the HP 28688B and HP 28699A you can also perform these and other functions with the HP network management products from a network management stati
57. onitor hub activity and status and run tests of the hub Console access can be either local by direct attachment to the console port or remote through a modem connection Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 1 1 Features continued Compatibility with the IEEE 802 3 Type 10Base T standard and support for both IEEE 802 3 and Ethernet protocols m A self test for fault identification when the hubs are powered on or when they are reset from the console or from a network management station m LEDs on both the front and back panels for easy interpretation of the hub s status m Automatic segmentation of ports that are experiencing network communication problems This improves network integrity and aids in fault isolation Segmented ports automatically resume operation when the problems are corrected See Auto Segmentation later in this chapter Support for a backup link to another hub an automatically activated redundant connection to enhance network fault tolerance HP 28688B and HP 28699A only A power supply that automatically adjusts to the voltage range of the ac power being supplied to the hub 90 120 volts or 200 240 volts No voltage range setting or fuse change is needed Comes with metal brackets that can be easily attached to the hub for mounting it in a standard 19 inch telco rack or on a wall m A factory assigned station address also called MAC address Ethernet address
58. onnected the test packets cannot be successfully sent and the backup port is activated Once you enable the primary port it assumes the active role 5 On the remote hub make sure that the ports connected to both the primary and backup links are enabled PO n ON On the monitoring hub the status of the primary and backup ports is controlled by the hub s firmware you do not need to explicitly enable the monitoring hub s ports Backup Links E 3 Identifying the Backup Link The ports designated as the primary and backup ports are identified on the hub console s Status command screen by the words PRI and BKUP respectively next to the port numbers HP network management products can also be used to identify the backup link See the HP network management product s documentation for more information Indications of Backup Link Activation When the primary link fails n consecutive test packet responses were not received on the primary port from the other hub the backup link is automatically enabled The effect of this change is displayed on the monitoring hub s LEDs and console interface Activation of the backup link does not change the status of any of the ports on the remote hub On the hub s LEDs The primary port LED goes off and the backup port LED goes on On the hub console s Status command screen The status of the primary port changes from ON to OFF and the backup port changes from OFF to ON On HP network
59. operating correctly Installation Summary The steps to install the hubs are Mount the hub in a rack on a wall or on a table Plug in the hub and verify its operation Connect the hub to devices and networks Customize the hub s configuration if necessary for example because you want to turn off the unused ports or for the HP 28688B and HP 28699A only because the hub will be managed remotely from a network management station on an IP network PWNE The details for these steps are provided in the rest of this chapter Tools and equipment needed for mounting the hub in a rack or on the wall m Phillips cross head number 1 screwdriver for rack or wall mounting m four s inch number 12 wood screws or equivalent for wall mounting only Installation 2 1 1 Mount the hub 1 Make sure the hub s power cord is correct for your country s ac power supply Do not plug the power cord into the power supply until the hub is mounted Note that the hub does not have a power switch the hub is powered on when the power cord is plugged in 2 As described on the next page mount the hub in a rack or on a wall by using the mounting brackets or place it on a table Before mounting the hub plan its location and orientation relative to other devices and equipment Also consider management of the cabling you will be attaching and consider access to the ports you will be using In the example below the hub is mounted in a rack wi
60. or physical address allowing the hub to respond to 802 2 Test packets The HP 28688B and HP 28699A can also be configured with an IP address and can respond to an ICMP Echo Request packet also called Ping m TheHP 28688B and HP 28699A can be managed remotely from a network management station that supports SNMP over IP using the configured IP address or IPX See Network Management later in this chapter Can be downloaded with new firmware enhancements HP 28688B and HP 28699A only either from a PC attached to the console port or over the network See Firmware Enhancements later in this chapter m TheHP 28684B can be upgraded to a managed HP 28688B Hub Plus by adding the Upgrade Kit HP part number J 2351A 1 2 Introducing the HP EtherT wist Hub 12 Hub Plus and Hub Plus 48 Included Parts m HP EtherTwist Hub 12 28684 60011 HP EtherTwist Hub Plus 28688 60011 or HP EtherTwist Hub Plus 48 28699 60001 m Accessories kit for the Hub 12 and Hub Plus 5062 9312 or the Hub Plus 48 5062 3397 induding two mounting brackets for the Hub 12 and Hub Plus 5001 5624 or the Hub Plus 48 5001 5641 four 10 mm M4 screws 0515 0780 four 9e in number 12 24 screws 2940 0238 AUI retainer 5062 3351 four self adhesive rubber feet 0403 0427 Velcro BNC T connector cover 1252 1650 m A Velcro strap holder attached to each of the hubs 50 pin ports 1400 1497 m A 12 port Modula
61. ork management station HP 28688B and HP 28699A only see the network management product documentation for instructions The hub will not transmit packets out ports that do not sense the link beat signal unless link beat is disabled on that port Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 1 7 Firmware Enhancements HP 28688B and HP 28699A Only Hewlett Packard continually tests and improves its products When firmware enhancements are made to the HP 28688B and HP 28699A hubs you will be able to easily update them with the new code The update can be made from a PC attached to the hub s console port directly or through a modem or the hub s new code can be downloaded over the network The update procedures are described in documents that come with the new code The firmware called the agent code enables a managed device to respond to requests for data from the HP OpenView Network Management station Contact your HP authorized LAN dealer or local HP sales office for the latest on firmware enhancements to the HP 28688B and HP 28699A hubs Network Management HP 28688B and HP 28699A Only The agent code firmware on the HP EtherTwist Hub Plus and Hub Plus 48 allows them to be managed remotely by any network management product that complies with the Simple Network Management Protocol SNMP standard HP offers SNMP compliant network management products both DOS based and UNI X based versions are available
62. own HP 37212B Support Link At the hub Set switches 8 9 11 and 12 up set to 1 all others down end set to 0 AUTO ANS on the front should be pushed in At the user Set switches 8 9 11 and 12 up set to 1 all others down end set to 0 Modem Configuration C 1 Black Box V 32 9600 Async patty nun Load the factory option set 1 Then make these changes Data Rate Menu change to 9600 uncoded Modem Parameters Menu changeto Forced Answer DTE Parameters Menu set DTR State to Responds to DTR Change set DSR State to DSR is Normal Set CTS State to CTS is Normal set DCD State to DCD is Normal sux user Configure as at the hub end except Modem Parameters Menu change to Normal Originate Hayes 1200 Smartmodem for both 8 and 10 switch units DI me nub Set all switches up end oci x Set switches 3 and 8 down all others up Racal Vadic Maxell 2400 VP Hayes 2400 Compatible At the hub Configure with a terminal or PC using the following end sequence at amp f amp c1 amp d2 amp s1q1 f0 amp wz Depress the ANS button The red light should go ON At the user Configure with a terminal or PC using the following end sequence at amp f amp c1 amp d2 amp s1 f0 amp wz C 2 Modem Configuration Network Addressing HP 28688B and HP 28699A Only The HP 28688B EtherTwist Hub Plus and the HP 28699A Hub Plus 48 can be managed over th
63. r Adapter included with the Hub 12 and Hub Plus only 28638 60001 m HP EtherTwist Hub and Hub Plus Installation Steps 5090 2693 m HP EtherTwist Hub and Hub Plus Installation and Reference Guide 5090 2692 m Power cord one of the following United Kingdom 8120 1351 Australia 8120 1369 Europe 8120 1689 United States Canada 8120 1378 Switzerland 8120 2104 Demark 8120 2956 Japan 8120 4753 Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 1 3 Front of the Hub Status LEDs Status LEDs HP 28684B and HP 28688B HP 28699A Status LEDs Line On green is ON if the hub is receiving power Activity green is ON when data is being transmitted The frequency shows the amount of traffic In heavy traffic it may appear on all the time Fault yellow is ON if the hub is faulty and needs to be replaced FLASHING if a port has been auto segmented See Auto Segmentation later in this chapter 1 4 Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 Back of the Hub Dashed lines show top half of the Hub Plus 48 with additional twisted pair port groups Group selector button and LEDs Group B Group D Group C A O 2 o 5 To Tt men Ga ST Status LEDs Station Address ThinLAN port Twisted pair ports and Console port AUI port Serial Number o 35 Status LEDs acu X
64. r Standard Cables Cable Function Port Type on Terminal PC or Modem Standard Cable or Cable Solution Connecting to the console port Connect a terminal or PC to the console port with an RS 232 C cable 25 pin female Attach a null modem adaptert Tandy Null Modem Adapter No 26 1496 has been tested to the console port Then attach a straight through modem cable to the null modem adapter 9 pin male Use a Black Box PC AT Serial Printer Cable EVNBPC has been tested OR Attach a null modem adaptert Tandy Null Modem Adapter No 26 1496 has been tested to the console port Then attach a modem cablet Black Box Cable EVNBMC and Cablex PC Modem Cable have been tested to the null modem adapter Connect a modem to the console port 25 pin female or male port Straight through RS 232 C modem cable standard cable For these cables the signals DTR pin 20 and RTS pin 4 must be on or high on your terminal or in your terminal emulation program t The required minimum pin out is listed in the section Console Connector and Cable Pin Outs Cables and Connectors A 3 Twisted Pair Cable Connector Pin Outs Twisted Pair Cable for Hub to Computer Connection To connect PCs or other network devices to the hub use a straight through cable The twisted pair wires must be twisted through the entire length of the cable The wiring sequence must conform t
65. rt Modular adapters attached to twisted pair ports EtherTwist BRUN EtherTwist hub l hub Twisted pair cable with Tx and Rx pairs reversed Between hubs Tx and Rx pairs must be reversed You can use the HP 92214W Crossover Cable with Inline Adapter to reverse the pairs For more details and a wiring diagram see appendix A ThinLAN Port to ThinLAN Port ThinLAN cable i HP EtherTwist h EtherTwist hub hub Bs BNC T attached to ThinLAN port AUI Port to Twisted Pair Port Twisted pair cable Tx and Rx pairs NOT reversed HP HP EtherTwist p EtherTwist hub N Twisted pair hub HP EtherTwist port with modular adapter transceiver OR attached to 50 pin connector AUI port Installation 2 9 Port Connections Caution Do not touch the connector pins of connectors or cables Static discharge may damage equipment Twisted Pair Port Using a 12 port modular adapter One modular adapter is included with the HP 28684B and HP 28688B You can order additional modular adapters product Screws number HP 28638A e 1 Remove the Velcro strap holder by Y gt unscrewing and removing the two screws E j that hold it to the back of the hub Velcro strap and holder 2 Plug the modular adapter into the hub s twisted pair port and tighten the two thumbscrews Be careful not to over tighten de wile apie Twisted pair port the thumbscrews Damage to a
66. s de vez en cuando a voltajes moment neos que entra en peligro rayos o alteraciones en la red de energ a el ctrica Manejar con precauci n los componentes de metal dela LAN que est n al descubierto Este aparato no contiene pieza alguna susceptible de reparaci n por parte del usuario Todas las reparaciones ajustes o servicio de mantenimiento debe realizarlos solamente el t cnico Este producto no tiene interruptor de potencia se activa cuando se enchufa el cable de alimentaci n Consideraciones sobre seguridad 5 Safety Information zc qo S Res A Vas TIMBRES Rink CORBIN TO Bav 27 VZERL HERAT E CHER EU E lago FE RA5FROIRACAfERERLET HE IscOvmo ER KERRAN EX 2fRETLET FRE TER DERRATE VCH BRA l FSV REC 258 HURL LCA TEL VS FIR CGE o 2 ETHOHMEE NAT lt RAW l ndieft22A21088mcduHEm TCU Z CORT ERR RADA CRT ERI F indddbo E2 kocob icomM UnBonxe t HMORETSLEMRECH b LIORAN BO DNC MHMENS ES ii EMO ga n Da CERI FEAL TEV TORS LAN 7 7 v Dimmi BL C e LLBIEOLAN Z8 Co BUE S ZT AL ENEDERNTRIMBEE Hi L TOLAK FNEDVYAFANRSEWOMER CBR RS SN THES ceReel TC KS e LAN 7VviXle amp L C fle BEBE H0 2 EO EERROR NATO BIH aNZLCLAAV ET EHLTEZEBSTOHRRLUTFZER FI BoT ZO AR BOWS 2K PEMCKAGMRILHOECA EX ME RFR S UES E AMM SCR R CB EDEN AN FIBRE REX PR DIETA EMO LAREDO LEIA LADOS 6 Safety Information Regulatory Statements FCC Statement For U S A Only Federal Communications Co
67. s not connected to a Type 10Base T device Unused twisted pair ports should have link beat enabled The lt port gt parameter can be m atwisted pair port number from 1 to 12 for the Hub 12 and Hub Plus and from 1 to 12 preceded by a group number for the Hub Plus 48 m atwisted pair port group number A B C or D Hub Plus 48 only ALL or AL for all twisted pair ports Example for the Hub 12 and Hub Plus Ll 1 OFF This disables link beat for port 1 Example for the Hub Plus 48 Ll A OFF This disables link beat for all group A ports PAssword HP 28688B and HP 28699A Only To set or change the password on the hub The password is used to prevent unauthorized access of the hub from network management stations The hub is initially shipped without a password Follow the prompts to enter a new password or to change the existing password You can use this command if you forget the password To remove an assigned password enter the command then press RETURN without entering any characters at the password prompt Ping HP 28688B and HP 28699A Only Torun atest of the path between the hub and another device that responds to IP packets The hub sends Internet Control Message Protocol ICMP Echo Request packets to another node with the specified IP address and waits for Echo Response packets in return When you run the Ping command you will be prompted for m thelP address of the destination device in the format X X X X m thenu
68. sover cable like ERN the HP 92214W can be used straight through to adapt a straight through hub we twisted pair cable for e cascading hubs through the ail twisted pair ports hub Cables and Connectors A 5 Twisted Pair Cable Pin Assignments Twisted Pair Straight Through Cable Computer or Hub End Transceiver End Signal Pins Pins Signal receive 1 1 transmit receive 2 2 transmit transmit 3 3 receive transmit 6 6 receive Twisted Pair Crossover Cable Hub 1 end Hub 2 end Signal Pins Pins Signal receive 1 6 transmit receive oe 3 transmit transmit 3 2 receive transmit 6 gt lt 1 receive Thin LAN Cable Requirements Thethin coaxial cables used with the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 must comply with the IEEE 802 3 Type 10Base2 requirements Some RG 58 A U or RG 58 C U cable meet these requirements The maximum length of a single thin coaxial cable segment is 185 meters A 6 Cables and Connectors AUI Cable Minimum Pin Out Transceiver Hub end Se 15 pin male Signal 15 pin female P 2 2 Control In circuit A 3 3 Data Out circuit A 4 4 Data In circuit Shield common drain 5 5 Data In circuit A 6 6 Voltage Common 9 9 Control In circuit B 10 10 Data Out circuit B 12 12 Data In circuit B 13 13 Voltage Plus For this connection you can use m HP 9226
69. sregard the other LEDs until you have attached the LAN segments to the network ports If the LED pattern is different refer to Diagnosing With the LEDs in chapter 4 Troubleshooting Installation 2 7 3 Connect the hub to devices and networks Use the network ports twisted pair AUI and ThinLAN to connect to computers other hubs or other network devices or to a network backbone Some examples follow showing how to connect devices and networks to the hub s network ports Details of how to connect your network cabling to the hub s ports are included later in this chapter Connecting Computers 25 pair cable to 4 pair twisted pair cable Hub cross connect block Hub z r E i d 50 pin connector attached to twisted pair port Modular adapter attached to twisted pair port Connecting to a Network Backbone Transceiver Hub Hub ThinLAN X coaxial cable ato Td AUI port TT Coaxial or fiber optic SN cable BNC T Make sure the SQE test is disabled ThinLAN port on the attached transceiver 2 8 Installation Connecting Other Hubs You can connect the hub to another HP EtherTwist twisted pair hub using any of the network ports Some examples are shown below Note that twisted pair cabling may pass through intermediate cross connect blocks See the HP EtherTwist Technical Reference Guide part number 5091 3237E for information on network topologies Twisted Pair Port to Twisted Pair Po
70. sses Telephone in U S only 1 800 365 3642 worldwide 1 703 802 4535 FAX 1 703 802 8376 Mailing Address Government Systems Inc Attn Network Information Center 14200 Park Meadow Drive Suite 200 Chantilly VA 22021 D 2 Network Addressing Building Your Own IP Addressing Scheme If your network is isolated and will not be connected to any other networks that use IP addressing you can build your own IP addressing scheme If you use your own addressing scheme be aware that any connection to another IP network could cause communication problems on both networks The IP addresses on the two networks must be compatible Each address must be unique The following documents have detailed descriptions on how to build your own IP addressing scheme m HP OpenView EtherTwist Network Management DOS Reference Guide HP part number 5091 3635E m Internetworking With TCP IP Principles Protocols and Architecture Author Douglas E Comer Publisher Prentice Hall I nc Example Addressing Scheme On the next page is an example of a class C addressing scheme Class C addresses allow up to 254 devices to be configured If you have 254 or fewer devices to be managed on your network you can use the addressing scheme shown below If you have more than 254 devices to configure see the referenced documents and use a class B addressing scheme Class B allows 65534 devices to be configured Network Addressing D 3 ThelP address format is X X X X wh
71. st connect a terminal or PC running a terminal emulator as described under Console Connection below Then use the console interface to change the desired hub configuration parameters The commands that you can use to change the hub s configuration are listed and described later in this section under Configuration Commands The HP 28688B Hub Plus and HP 28699A Hub Plus 48 can also be configured over the network from an HP network management station See the network management product documentation for more information Console Connection Connect a terminal to the hub s console port directly or through modems as described below Connecting a Terminal Directly 1 Connect a terminal or a PC emulating a terminal to the console port using an RS 232 C cable For pin outs and recommended cables see appendix A Cables and Connectors 2 Switch on the terminal s power or switch on the PC s power and start the terminal emulation program Configure the terminal for 8 bits per character 1 stop bit no parity Xon Xoff handshaking and a baud rate of 9600 2400 1200 or 300 3 Press RETURN several times for the prompt gt The baud rate for communication between the hub and the terminal is set automatically when you press RETURN 2 14 Installation Connecting a Modem and Terminal 1 Usea full duplex asynchronous character mode modem only The following modems have been tested at their rated speeds HP 3721
72. sted products HP relies in part upon information from the suppliers of non HP products and makes no warranty expressed or implied with respect to the operation of these products or their compliance with worldwide regulatory requirements HP advises customers to conduct independent examination to determine suitable levels of compatibility for the customer s individual needs Gewahrleistung HP gew hrleistet da die Ger te frei von Material und Fabrikationsfehlern sind Die Gew hrleistungsfrist betr gt ein J ahr ab Lieferung Etwaige fehlerhafte Ger te werden nach eigenem Ermessen repariert oder ersetzt Garantia Esta pieza de hardware esta garantizada por HP contra defectos de materiales o manufactura por un per odo de un a o a partir del momento en que el usuario la recibe Durante dicho per odo de garant a HP o un distribuidor autorizado reparar o reemplazar seg n su criterio aquellos productos que resulten defectuosos Garantie Hewlett Packard garantit le mat riel d informatique personnelle contre tout d faut de mati re et de fabrication pour une p riode d un an compter de la r ception du mat riel par l utilisateur Hewlett Packard ou le distributeur agr HP choisira de remplacer ou de r parer tout produit d fectueux Garanzia La Hewlett Packard garantisce i propri prodotti hardware per computer contro i difetti di materiali e di fabbricazione per un periodo di 12 mesi dal giorno in cui li riceve l
73. tandards m TheRS 232 C console port conforms to V 22 bis Specifications B 3 Electromagnetic Emissions FCC part 15 Class A CISPR 22 Class A EN 55022 Class A VCCI Class Immunity ESD Radiated Emissions in US Canada and Latic America in Europe in J apan prEN 55101 2 1991 IEC 801 2 3 kV CD 8 kV AD in Europe prEN 55024 3 1991 IEC 801 3 draft 3 V m in Europe These specifications are legal requirements in the indicated countries Datacomm Declarations United Kingdom The HP 28699A hub is approved under Approval Number NS G 1234 100003 for indirect connection to public telecommunications systems within the United Kingdom Sweden Application and Dedaration of Conformity to Swedish requirements has been filed Germany Application for Certification and License approval have been filed B 4 Specifications Modem Configuration HP 35031A Support Link Il At the hub Configure SOFT OPTION 6to1 end Configure SOFT OPTION 15 to2 Configure SOFT OPTION 16 to2 Configure SOFT OPTION 20 to2 Configure SOFT OPTION 21 to2 a user Configure SOFT OPTION 16 to2 HP 50759A Support Link At the hub For an 8 position switch set switch 4 down all others up end For a 4 position switch set switch 2 up all others down At the user For an 8 position switch set switches 3 and 8 down all end others up For a 4 position switch set all switches d
74. th a network management product such as HP OpenView Hub Manager or HP OpenView Interconnect Manager over an IP network a network operating system that uses IP communications m Thenetwork cable segments attached to the hub will be tested using the IP Ping test Note Novell NetWare uses the IPX protocol If you areusingthe hub on a Novell NetWare network no configuration of the hub is required for it to communicate with a network management station that is also using the IPX protocol IPX is automatically enabled on the hub The hub determines its IPX address automatically from information received from a router or file server that is running IPX on the network and from its own station address also sometimes called the MAC address physical address or Ethernet address See appendix D Network Addressing for more information At the console interface prompt enter IP and you will be prompted to enter values for the parameters listed on the next page Operation 3 5 IP Address Subnet Mask Primary Default Router Backup Default Router Time To Live ThelP address of the hub written in the format X X X X Each number between the decimal points is a decimal number between O and 255 Every IP address on a network must be unique The default is 0 0 0 0 which disables IP communications on the hub The bit mask defining which portion of the IP address is the subnet address written in the format X X X X A default va
75. th other HP EtherTwist family devices and a cable guide unit Order the HP EtherTwist LAN Rack HP 46298D and the Cable Guide HP 35199D If you are using a modular adapter on an EtherTwist hub position that hub at least one rack unit apart from any HP Fiber Optic Hub Plus for easier port access oo E a E 3 la CDI a N S e HP network Cable guide gt 9 Ka LAO fen Na 7 devices hubs bridges etc T x OWNS Pal Thin coaxial cable backbone W o o o o o o o Standard 19 inch telco rack o o 2 2 Installation Mounting the HP 28684B EtherTwist Hub 12 and HP 28688B Hub Plus For Rack or Cabinet Mounting 1 Using a Phillips or cross head screwdriver attach the mounting brackets to the hub with 10 mm M4 screws included in accessory kit Note that the hub s case and the mounting brackets are designed to allow you to rack mount the hub with either the back or the front facing out 2 Position the hub in the rack or cabinet and slide it up or down until the rack holes line up with the bracket holes Then attach the hub to the rack with 38 inch number 12 24 screws included in the accessory kit Some cabinets require number 10 32 screws instead a
76. the station address of the hub at the remote end of the link how frequently in seconds test packets used to check the status of the primary link should be sent to the remote hub and how many consecutive response failures will trigger activation of the backup link The Backup command is described in more detail in chapter 3 Operation under the section Console Commands Follow this Configuration Installation Sequence f a hub is installed in a network that includes two connections to another hub until one of the connections can be configured as a backup link a loop in the network exists causing some network performance degradation For this reason it is better to configure the backup link on the hub before the hub is installed in the network It is best to follow these steps 1 Attach a console to the hub s console port and start a console session For instructions see step 4 Customize the hub s configuration in chapter 2 2 Usethe Backup command BA to complete the backup link configuration See the Backup command description in chapter 3 or enter HE BA at the console prompt for online help on the Backup command 3 Complete the network cable connections between the monitoring hub and the remote hub For instructions see Port Connections in chapter 2 4 Enable the primary port with the Port command enter PO n ON where n is the primary port s ID This step is necessary because without the cables c
77. ty and must be replaced See chapter 3 Operation for console command details m For the HP 28688B and HP 28699A only use an HP network management product torun a self test For instructions see the network management documentation 4 4 Troubleshooting Testing the Hub s Ports and the Links Totest the hub s ports and the attached network links choose one of the following ways to run a test between the hub and an addressable device connected at the remote end of each of the cables you wish to test m Usethe console s Testlink command to run a link test This works with devices able to send an IEEE 802 2 Test response packet upon receipt of a Test command packet Y ou specify the remote device by its 12 digit hexadecimal station address See Testlink in chapter 3 for details m FortheHP 28688B and HP 28699A only use the console s Ping command to run a network layer test This works with devices having an IP address and which are able to respond to an ICMP echo request packet Y ou specify the remote device by its IP address See Ping in chapter 3 for details m Forthe HP 28688B and HP 28699A only use HP network management software to test the link For instructions see the network management product s documentation If the test passes the hub s port the network link and the remote device are all working properly If testing the AUI port this also tests a transceiver that is connected to the port If the test fails
78. ured on the monitoring hubs for those links should be increased by one second for each additional backup link beyond two links Add one to this count if the remote hub is also functioning as a primary hub in a different link Additional Notes m Any port on the hub can be used for either the primary link or the backup link m Any combination of media types can be used For example a thin coax link from the ThinLAN port can act as a backup link to a twisted pair link using one of the hub s twisted pair ports A transceiver attached to the hub s AUI port can provide a primary or backup link over any type medium twisted pair coax or fiber optic cable See Sample Topologies later in this appendix m Theprimary link and the backup link cabling should be run over different paths through different conduits for example to reduce the possibility that damage will occur to both cables simultaneously E 2 Backup Links Configuring a Backup Link Configure the Monitoring Hub Only All configuration of the backup link is performed from the console on the hub that is responsible for monitoring the backup link On the remote hub you only need to make sure the ports used in the primary and backup links are both enabled Use the Console s Backup Command To configure this link you use the Backup command on the hub console interface The command prompts you to identify the port used for the backup link the port used for the primary link
79. us 48 with a non HP network management product you must first obtain HP s Network Management I nformation Base MIB extensions The HP MIB extensions are available on request Contact your HP authorized LAN dealer or local HP sales office Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 1 9 Upgrading the HP 28684B to an HP 28688B Toadd network management capabilities the HP 28684B EtherTwist Hub 12 can be upgraded to an HP 28688B EtherTwist Hub Plus The upgrade procedure involves a software download to the HP 28684B Hub 12 using a unique password The HP EtherTwist Hub 12 Upgrade Kit HP part number J 2351A is available from your nearest Dealer or HP Sales Office One Upgrade Kit must be ordered for each HP 28684B Hub 12 to be upgraded Once upgraded the HP 28684B Hub 12 becomes an HP 28688B Hub Plus and includes the following features m Remote management capability from a network management station that supports SNMP over IP or IPX m Additional console commands IP configuration BAck up link configuration PIng network layer ICMP Echo Request test PAssword to set network management access control Network update capability for future firmware enhancements 1 10 Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 Installation This chapter describes how to install and configure the HP 28684B EtherTwist Hub 12 HP 28688B Hub Plus and HP 28699A Hub Plus 48 and verify that they are
80. vailable as part number 2680 0302 Make sure you have screws that fit your cabinet or rack before mounting the hub SM SR Mounting bracket Front facing out 10 mm M4 screws Mounting bracket 5 inch number 12 24 screws Back facing out Installation 2 3 For Wall Mounting Using a Phillips or cross head screwdriver attach the mounting brackets to the hub with 10 mm M4 screws included in the accessories kit Then attach the hub to a wood surface minimum gt inch plywood or equivalent with g inch number 12 wood screws or equivalent not included Mounting bracket ee Flat on wall Mounting bracket Straight out from wall 10 mm M4 screws For Table Mounting Attach the self adhesive rubber feet to the bottom of the hub Set the hub on a table near a power source 2 4 Installation Mounting the HP 28699A Hub Plus 48 For Rack or Cabinet Mounting 1 Using a Phillips cross head screwdriver attach the mounting brackets to the hub with 10 mm M4 screws included in accessory kit 2 Position the hub in the rack or cabinet and slide it up or down until the rack holes line up with the bracket holes Then attach the hub to the rack with inch number 12 24 screws included in accessory kit 10 mm M4 screws Mounting bracket You can rack mount the hub with either the back or the front facing out 54 inch 12 24 screws Some cabinets require
81. w of how the hub works Chapter 2 provides hub installation instructions It describes in detail the steps that you should follow to install the hubs Chapter 3 describes all the hubs console interface commands Chapter 4 contains troubleshooting information If you experience problems with the hubs you should refer tothis chapter Appendix A provides information on the cables and connectors that you should use to connect the hubs to the other devices in your network Appendix B contains the technical specifications for the hubs Appendix C describes how to configure commonly found modems for use with the hubs console connection Appendix D is applicable only for the HP 28688B and HP 28699A and provides information on network addressing for those using SNMP network management stations to manage the hubs over IP and IPX networks Appendix E is applicable only for the HP 28688B and HP 28699A and provides information on establishing a backup connection for a critical link to another hub in your network topology Safety Information contains safety information about the hubs You should read and understand this information before you usethe product Contents 1 Introducing the HP EtherTwist Hub 12 Hub Plus and Hub Plus 48 Features is a uS E A A a a UE Rip lat a 1 1 Included Parts 5 ia aaa wks Sew a ew cu 1 3 Frontof the Hub cup ada ava a Wee a areal wed ath oa eB a ee 1 4 Status LEDS xm RR SR Xx a wid Go a ea weh 1 4
82. wisted pair cable Za Backup Links E 7 Safety Information Safety Symbols A Documentation reference symbol If the product is marked with this symbol refer to the product documentation to get more information about the product WARNING A WARNING in the manual denotes a hazard that can cause injury or death CAUTION A CAUTION in the manual denotes a hazard that can damage equipment Donot proceed beyond a WARNING or CAUTION notice until you have understood the hazardous conditions and have taken appropriate steps Grounding These are safety class products and have protective earthing terminals There must be an uninterruptible safety earth ground from the main power source to the product s input wiring terminals power cord or supplied power cord set Whenever it is likely that the protection has been impaired disconnect the power cord until the ground has been restored For LAN cable grounding m If your LAN covers an area served by more than one power distribution system be sure their safety grounds are securely interconnected W LAN cables may occasionally be subject to hazardous transient voltages such as lightning or disturbances in the electrical utilities power grid Handle exposed metal components of the network with caution Servicing There are no user serviceable parts inside these products Any servicing adjustment maintenance or repair must be performed only by service trained personnel These produ
83. xcessive collision condition is removed and normal traffic is restored Auto segmentation can also be caused by improper termination of cabling attached to the AUI or ThinLAN ports or by having nothing attached to the ThinLAN port when it is enabled If a port is auto segmented its port LED and the Fault LEDs will flash A segmented ThinLAN port will not cause the F ault LED to flash unless Thinwatch has been explicitly enabled with the Thinwatch console command The Thinwatch command is described in chapter 3 If a port is auto segmented only the LAN segment attached to that port is affected The other LAN segments will operate normally If a port is disabled explicitly by using the console port or from an HP network management station HP 28688B and HP 28699A only it must be enabled explicitly It will not be enabled automatically Link Beat Type 10Base T devices use a signal called link test pulse link beat in HP documentation This signal informs a hub of the presence of a device connected to it over twisted pair cable and the integrity of the twisted pair link between them If your network has a mixture of 10Base T and non 10Base T products you may have to disable link beat on some of them For the HP EtherTwist hubs disable link beat on any port that is connected toa non 10Base T device You can do this through the Link beat console command see chapter 3 Operation in this manual for command details or from an HP netw

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