HP 10Base-T Reference Guide
Contents
1. 1 3 HP AdvanceStack 8U 16U SNMP Module 1 3 HP Transceiver Modules 1 5 2 Verify the hub s operation 1 6 3 Mount the hub 1 8 Rack or Cabinet Mounting 1 9 Wall Mounting 1 10 4 Complete the network connections to the hub 1 11 Connecting Devices to the Hub 1 11 Cable management 1 12 Connecting Hubs Together 1 13 Connecting Hubs to Network Backbones 1 15 2 Troubleshooting Troubleshooting Approaches 2 2 Diagnosing with the LEDs 2 3 LED Pattern During Self Test 2 3 LED Error Indications 2 4 Installation Problems 2 6 Incorrect Hardware Installation 2 6 Cabling Problems 2 6 Unusual Network Activity2. 3 5 Link Beat 3 5 A Cables and Connectors Recommended Cables A 2 Twisted Pair Cable Connector Pin Outs A 3 Twisted Pair Cable for Hub to Computer Network Connection A 3 Twisted Pair Cable Pin Assignments A 4 ThinLAN Cable Requirements A 4 B Specifications Safety and Regulatory Statements Index viii 1 Installing the Hub Installation Summary Included Parts 1 Install Add in Modules Optional 2 Verify the Hub s Operation 3 Mount the Hub 4 Complete the Network Connections to the Hub Installation Summary The basic hardware installation procedure for the Hub 16U is as follows 1 Install the optional HP AdvanceStack 8U 16U SNMP Module and or one of the optional HP Transceiver Modules 2 Verify the hub s operation 3 Mount the hub in a rack on a wall or place it on a tabletop 4 Connect the hub to a network and connect computer s and or other device s to the hub s ports Included Parts Each Hub 16U has the following components shipped with it HP AdvanceStack Hub 16U Installation and Reference Guide this manual J2611 90101 A power cord one of the following Australia New Zealand Denmark Europe Japan Switzerland United K
3. 2 7 Diagnostic Tests 2 7 Testing the Hub Only 2 8 Testing Twisted Pair Cabling 2 8 Testing End to End Network Communications 2 9 Replacement Instructions 2 10 vii Customer Support Services 2 11 HP BBS and World Wide Web 2 11 Hewlett Packard FTP Library Service 2 12 CompuServe 2 13 HP FIRST Fax Retrieval Service 2 14 HP Network Phone In Support NPS 2 14 3 Hub Reference Front of the Hub 3 2 Hub status LEDs 3 2 Port status LEDs 3 3 AUI Xcvr Slot 3 3 Back of the hub 3 3 Hub Operation 3 4 Collision Detection 3 4 Auto Partitioning
4. 2 12 CompuServe CompuServe is an electronic information and communication service run by an independent company The service is typically accessed with a computer and modem and uses standard voice telephone lines for transmitting and receiving data CompuServe is available 24 hours a day seven days per week The participants pay a monthly fee for this service To get the latest agent firmware from CompuServe follow these steps 1 Login to CompuServe 2 Type go hpsys 3 Type lib 7 4 Type download filename e g download j3133a exe 5 Log off CompuServe 6 Extract the file e g j3133a x Troubleshooting Troubleshooting 2 13 HP FIRST Fax Retrieval Service HP FIRST is an automated fax retrieval service that is available 24 hours a day seven days a week HP FIRST provides information on the following topics Product information Troubleshooting instructions Technical reviews and articles Configuration information To access HP FIRST dial one of the following phone numbers Location Phone Number U S and Canada Only Dial 1 800 333 1917 with your fax machine or touch tone phone and press 1 Outside the U S and Canada Dial 1 208 344 4809 from your fax machine and press 9 To receive a list of currently available documents enter document number 19941 The information you requested will be sent to you by return fax HP Network Phone In Support NPS Call your HP Authorized De
5. Simbolo di riferimento alla documentazione Se il prodotto contrassegnato da questo simbolo fare riferimento alla documentazione sul prodotto per ulteriori informazioni su di esso WARNING La dicitura WARNING denota un pericolo che pu causare lesioni o morte CAUTION La dicitura CAUTION denota un pericolo che pu danneggiare le attrezzature Non procedere oltre un avviso di WARNING o di CAUTION prima di aver compreso le 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 se la vostra 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 i cavi LAN possono occasionalmente 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 espo
6. Troubleshooting Troubleshooting 2 9 Replacement Instructions Remove any of the optional modules that you have installed into your hub before returning it to Hewlett Packard Keep the optional modules to install them into the replacement hub The modules can be damaged easily by small amounts of static electricity Observe these precautions when removing and installing the modules When handling the module first touch a grounded metal surface or wear an anti static wrist strap that is attached to grounded metal To prevent generating static electricity minimize your movement around the work area or work in an anti static work area Handle the module carefully at all times Avoid flexing it or touching its components The faulty hub should be returned to Hewlett Packard with the AUI Xcvr and management slots empty and the cover plates installed For information about how to remove the modules see the manuals accompanying the HP Transceiver Module and the HP AdvanceStack 8U 16U SNMP Module Troubleshooting Troubleshooting 2 10 Customer Support Services Hewlett Packard offers support 24 hours a day seven days a week through the use of automated electronic services including Hewlett Packard BBS and World Wide Web Hewlett Packard FTP Library Service on the Internet CompuServe HP FIRST FAX Retrieval Service SNMP firmware for the AdvanceStack 8U 16U SNMP module J3133a exe is available through the HP BBS
7. World Wide Web CompuServe and the HP FTP Library Service After you download the file s from one of these sources you type filename x For example icmupdt x HP BBS and World Wide Web The HP BBS phone number is 208 344 1691 in the USA Set your modem communication settings to parity N data bits 8 stop bits 1 baud rates 300 1200 2400 4800 9600 or 14400 From the BBS you can download files and learn about HP networking products After you download the file extract the file e g j3133a x The URL address for the World Wide Web is http www hp com go network_city From this web site you can download files and learn about HP networking products After you download the file extract the file e g j3133a x Troubleshooting Troubleshooting 2 11 Hewlett Packard FTP Library Service To access the HP FTP Library follow these steps 1 Enter the command ftp ftp boi external hp com The ftp gt prompt appears 2 At the ftp gt prompt enter anonymous 3 At the password prompt enter your internet e mail address 4 Change directories cd pub networking software 5 At the ftp gt prompt set the transfer type to binary bin 6 List the contents of the directory dir 7 Retrieve the file by entering get filename e g get j3133a exe 8 Quit the FTP session by entering quit 9 Extract the file e g j3133a x Troubleshooting Troubleshooting
8. no special tools are necessary Attach the self adhesive rubber feet included in the accessory kit to the bottom of the hub Be certain to pick a sturdy table in an uncluttered area You may want to secure the hub s cables to the leg of the table to prevent people from tripping over them 10 mm M3 screws Flat on wall Mounting bracket Straight out from wall 10 mm M3 screws Mounting bracket Installing the Hub Installing the Hub 1 10 4 Complete the network connections to the hub Reconnect the hub to the power source and then make the network connections to the hub With the hub mounted you are now ready to connect the hub to your network Typical hub connections are Hub to device connections Connecting to network devices such as computers and printers Hub to hub connections Connecting to another HP AdvanceStack 10Base T hub or other Ethernet hub Hub to network backbones Connecting to a network backbone This section describes the different ways you can connect your hub to your network Connecting Devices to the Hub To connect a device to the hub push the RJ 45 plug into the RJ 45 jack until the tab on the plug clicks into place RJ 45 plug unshielded twisted pair cable to a computer or printer Installing the Hub Installing the Hub 1 11 Cable management The Hub 16U has been designed to help you with the problem of managing your network cables Each mounting bracket has a lo
9. Perforate Perforate Perforate Perforate Perforate Obtain the latest agent firmware j3133a exe from HP FTP Library ftp ftp boi external hp com World Wide Web http www hp com go network_city HP BBS 208 344 1691 CompuServe go hpsys lib 7 download j3133a exe HP AdvanceStack Hub 16U Installation and Reference Guide Copyright Hewlett Packard Company 1996 All Rights Reserved Disclaimer Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws The information contained in this document is subject to change without notice 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 Hewlett Packard assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Hewlett Packard Warranty See the warranty statement and the registration form included with the product A copy of the specific warranty terms applicable to your Hewlett Packard product and replacement parts can be obtained from your HP Sales and Service Office or authorized dealer Publication Number J2
10. protection against such interference when operated in a commercial environment If this equipment causes interference to radio reception which can be determined by unplugging the power cord from the equipment try these measures Re orient the receiving antenna Relocate the equipment with respect to the receiver Plug the equipment and receiver into different branch circuits Consult your dealer or an experienced technician for additional suggestions VCCI Class 1 For Japan Only N o t e This is a class A product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures Safety and Regulatory Statements 8 Declaration of Conformity The following Declaration of Conformity for the HP AdvanceStack Hub 16U complies with ISO IEC Guide 22 and EN 45014 The declaration identifies the product the manufacturer s name and address and the applicable specifications that are recognized in the European community Safety and Regulatory Statements 9 Index 50 ohm terminator for a ThinLAN cable segment 1 15 A Activity LED 3 2 AUI Xcvr LED 3 3 auto partitioning basic operation 3 5 B back of the hub installing optional modules 1 3 BBS obtaining software from 2 11 bulletin board obtaining software from 2 11 C cabinet mounting instructions for 1 9 cable management using 1 12 cable tie for cab
11. receive receive transmit transmit 1 2 3 6 1 2 3 6 transmit transmit receive receive ThinLAN Cable Requirements If you add an HP J2608A ThinLAN Transceiver Module the thin coaxial cables used with the module must comply with the IEEE 802 3 Type 10Base2 requirements Some RG 58 A U or RG 58 C U cables meet these requirements The maximum length of a single thin coaxial cable segment is 185 meters The minimum length for example to connect adjacent hubs in a rack is 0 5 meter Cables and Connectors Cables and Connectors A 4 B Specifications Physical Electrical Environmental Connectors Electromagnetic Physical Width 42 5 cm 16 8 in Height 4 36 cm 1 7 in Depth 23 8 cm 9 4 in Weight 2 2 kg 4 8 lb Electrical ac voltage 100 127 volts 200 240 volts Maximum current 0 3A max 0 2A max Frequency range 50 60 Hz 50 60 Hz Environmental Operating Non Operating Temperature 0 C to 55 C 32 F to 131 F 40 C to 70 C 40 F to 158 F Relative humidity non condensing 15 to 95 at 40 C 104 F 15 to 90 at 65 C 149 F Maximum altitude 4 6 km 15 000 ft 4 6 km 15 000 ft Connectors The RJ 45 twisted pair ports are compatible with the IEEE 802 3 Type 10Base T standard Electromagnetic Emissions FCC part 15 Class A EN 55022 Class A CISPR 22 Class A VCCI Level I Complies with C
12. the four 5 8 inch number 12 wood screws in the accessory kit Hewlett Packard sells 19 inch free standing equipment racks To order a rack for your hub call HP at 1 800 538 8787 to order part number 46298D M o u n t i n g P r e c a u t i o n s Before mounting the hub follow these mounting precautions Plan the hub s location and orientation relative to other devices and equipment Also consider the cabling that will be attached to the hub and ports that will be used In the front of the hub leave 3 inches 7 6 cm of space for twisted pair cables In the back of the hub leave 3 inches 7 cm of space for the power cord the 8U 16U SNMP module and a serial cable Ensure that the HP AdvanceStack hub s do not overload the power circuits wiring and over current protection To determine the possibility of overloading the supply circuits add together the ampere ratings from the nameplates of all your hubs and other equipment installed on the same circuits and compare the total with the rating limits for the supply circuits Make sure that the power source circuits are properly grounded then use the supplied power cord to connect the HP AdvanceStack hub to the circuit See the Safety Statements at the end of this manual Do not install the HP AdvanceStack hub in an environment where the operating ambient temperature might exceed 55 C 131 F Make sure the air flow around the sides and back of the hub is not restricted Ins
13. 611 90101 Edition 1 February 1996 Applicable Product HP J2611B Trademark Credits MS DOS and Microsoft are U S registered trademarks of Microsoft Corporation Ethernet is a registered trademark of Xerox Corporation 8000 Foothills Boulevard Roseville California 95747 5551 http www hp com go network_city HP AdvanceStack Hub 16U At A Glance The HP J2611B AdvanceStack Hub 16U is a multiport repeater with 16 twisted pair network ports With this hub you can connect computers and other devices together in an unshielded twisted pair cable network The hub is compliant with the IEEE 802 3 Type 10Base T standard and supports both 802 3 and Ethernet networks iii MDI MDI X switch for port 16 Hub status LEDs Twisted pair ports Twisted pair port LEDs Front of the Hub Cover plate over slot for HP AUI and Transceiver Modules ac power receptacle Cover plate over slot for HP AdvanceStack 8U 16U SNMP Module Back of the Hub iv Features Network Connections 16 RJ 45 twisted pair ports to connect to end nodes or other devices A Media Dependent Interface MDI switch for Port 16 which allows you to connect either an end node MDI X position or to cascade a hub MDI position to the port using a straight through twisted pair cable in both cases Upgradeable Design A management slot in the back of the hub enables you to install an HP AdvanceStack 8U 16U SNMP Module With the module you can
14. 6U to a ThinLAN Backbone The optional ThinLAN Transceiver Module has a BNC 10Base2 port that can be used to connect your hub to a ThinLAN backbone ThinLAN coax connecting the hubs together Hub 16U Hub 16U HP AdvanceStack 10Base T Hub 24 50 ohm terminator 50 ohm terminator Installing the Hub Installing the Hub 1 15 The following illustration shows a hub with an HP ThinLAN Transceiver Module connected to a thin LAN backbone Connecting the Hub 16U to a Fiber Optic Backbone With an HP Fiber Optic Transceiver Module for 10Base FL networks you can connect your hub to a fiber optic backbone The following illustration shows a hub with an HP Fiber Optic Transceiver Module connected to a fiber optic backbone For more information about cabling configuration see the documentation accompanying the optional transceiver modules See the Designing HP AdvanceStack Workgroup Networks guide for information on valid network topologies ThinLAN backbone HP J2606A Fiber Optic Transceiver Module installed in the AUI Xcvr Slot fiber optic cable to a fiber optic backbone Installing the Hub 1 16 2 Troubleshooting Troubleshooting Approaches Diagnosing with the LEDs Installation Problems Cabling Problems Unusual Network Activity Diagnostic Tests Replacement Instructions Customer Support Services This chapter describes how to diagnose and resolve operating problems with your hub Addit
15. AUTION erst fort nachdem Sie den Gefahrenzustand verstanden und die entsprechenden Ma nahmen ergriffen haben Dies ist ein Ger t der Sicherheitsklasse I und verf gt ber einen sch tzenden Erdungsterminal Der Betrieb des Ger ts erfordert eine ununterbrochene Sicherheitserdung von der Hauptstromquelle zu den Ger teingabeterminals den Netzkabeln oder dem mit Strom belieferten Netzkabelsatz voraus Sobald Grund zur Annahme besteht da der Schutz beeintr chtigt worden ist das Netzkabel aus der Wandsteckdose herausziehen bis die Erdung wiederhergestellt ist F r LAN Kabelerdung 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 LAN Kabel k nnen gelegentlich gef hrlichen bergangsspannungen ausgesetzt werden beispielsweise durch Blitz oder St rungen in dem Starkstromnetz des Elektrizit tswerks Bei der Handhabung exponierter Metallbestandteile des Netzwerkes Vorsicht walten lassen Dieses Ger t enth lt innen keine durch den Benutzer zu wartenden Teile Wartungs Anpassungs Instandhaltungs oder Reparaturarbeiten d rfen nur von geschultem Bedienungspersonal durchgef hrt werden Dieses Ger t hat keinen Netzschalter es wird beim Anschlie en des Netzkabels eingeschaltet Safety and Regulatory Statements 4 Considerazioni sulla sicurezza Simboli di sicurezza
16. AdvanceStack 8U 16U SNMP Module installed see the module manual If Port 16 check the position of the MDI MDI X switch For hub to hub connections set the switch to MDI For hub to PC connections set the switch to MDI X ON OFF Verify that the HP Transceiver Module is firmly inserted into the AUI Xcvr slot into the front of the hub See the documentation accompanying the HP Transceiver Module for more troubleshooting information ON Flashing intermittently Check cabling on indicated port If you have an HP AdvanceStack 8U 16U SNMP Module installed see the HP AdvanceStack 8U 16U SNMP Module manual This LED is not important for the diagnosis Troubleshooting Troubleshooting 2 4 LED patterns indicating problems Diagnostic Tips Power Collision AUI Xcvr Port Twisted Pair Port ON Appears solidly ON Very frequent collisions are occurring which could indicate a network fault or improperly terminated cable A transceiver attached to the AUI port may not have the SQE test disabled For information about the SQE test see your documentation accompanying your transceiver module If you have an HP AdvanceStack 8U 16U SNMP Module installed see its manual ON Slow Flash The port has been auto partitioned because of an excessive collision condition Check cable connections and status of attached network devices for causes of the excess collisions ON Slow Flash The tra
17. HP Product Number Network connections to the hub Hub to end node connection or hub to hub connection using the MDI MDI X switch Twisted pair straight through cable 92268A 4 pair 4 meters 92268B 4 pair 8 meters 92268C 4 pair 16 meters 92268D 4 pair 32 meters 92268N 4 pair 300 meters The maximum total length of any twisted pair segment is 100 meters You can contact your HP authorized dealer or call HP at 1 800 538 8787 to order these parts Cables and Connectors Cables and Connectors A 2 Twisted Pair Cable Connector Pin Outs Twisted Pair Cable for Hub to Computer Network Connection To connect PCs or other network devices to the hub use a straight through 10Base T cable The twisted pair wires must be twisted through the entire length of the cable The wiring sequence must conform to 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 N o t e Pins 1 and 2 must be a twisted pair Pins 3 and 6 must be a twisted pair Pins 4 5 7 and 8 are not used in this application although they may be wired in the cable Straight through cable white orange orange white white green green white Cables and Connectors Cables and Connectors A 3 Twisted Pair Cable Pin Assignments Twisted Pair Straight Through Cable Hub End Computer or Transceiver End Signal Pins Pins Signal
18. Installation and Reference Guide HP J2611B HP AdvanceStack 10Base T Hub 16U HP Customer Support Services How to get the latest software agent firmware You can download HP AdvanceStack 8U 16U SNMP firmware j3133a exe from the HP BBS HP FTP Library Service CompuServe and the World Wide Web After you download the file extract the file by typing filename x For example j3133a exe x HP BBS Set your modem to N 8 1 set speed up to 14400 bps and with your telecom munication program e g Windows Terminal dial 208 344 1691 to get the latest software for your HP networking product HP FTP Library Service 1 FTP to Internet IP Address ftp boi external hp com 2 Log in as anonymous and press Return at the password prompt 3 Enter bin to set the transfer type 4 Enter cd pub networking software 5 Enter get filename to transfer the file to your computer and quit CompuServe 1 Login to CompuServe 2 Enter go hpsys 3 Enter lib 7 4 Enter download filename and then quit World Wide Web http www hp com go network_city Select the Support section then Software Downloads and Patches Download the file you need and extract it by typing filename x Do you have questions about designing your expanding network From this web site you can also download the Designing HP AdvanceStack Work groups Networks Guide which addresses capacity planning or dial 1 800 752 0900 to receive a copy through the mail
19. X switch Installing the Hub Installing the Hub 1 13 In the following illustration the first hub is connected to two end nodes and to a second hub ThinLAN Connections With an HP ThinLAN Transceiver Module for 10Base2 networks you can connect your hub or a stack of hubs to a thin LAN network The following illustration shows a hub with an HP ThinLAN Transceiver Module Up to 100 meters PC attached to Port 16 switch in MDI X position and straight through cable is used Hub attached to Port 16 switch in MDI position and straight through cable is used HP J2608A ThinLAN Transceiver Module installed in the AUI Xcvr Slot thin LAN cable 50 ohm terminator Installing the Hub Installing the Hub 1 14 You can connect up to 30 hubs together on a common ThinLAN segment The ThinLAN segment can include a computer attached to a hub at one end of the segment that can communicate with a computer attached to another hub at the other end of the segment By using the BNC port on the module the maximum repeater hop count increment through the entire segment is only two The following illustration shows you how to connect three hubs together from one ThinLAN port to another N o t e Each ThinLAN cable segment must be terminated using a 50 ohm terminator at each end In the illustration above a 50 ohm terminator is placed at each end of the cable segment Connecting Hubs to Network Backbones Connecting the Hub 1
20. ack of the hub Installing the Hub Installing the Hub 1 6 2 Check the LEDs on the hub s front panel When the hub is powered on it performs a self diagnostic test During the test all of the hub LEDs are lit for approximately 3 seconds When the self test completes successfully the following events occur the Power LED stays on the twisted pair Port LEDs enter their normal operating state If an HP Transceiver module is installed the AUI Xcvr LED will display the state of that port A Port LED stays on if link beat has been detected at the port A Port LED turns off if link beat is not detected If you have an optional HP AdvanceStack 8U 16U SNMP Module installed the Port LEDs have additional meanings See the documentation accompanying the module for more information If all of the Port LEDs stay on after 3 seconds and you have not connected end nodes to these ports the hub has failed its self test See chapter 2 Troubleshooting for information about diagnosing your hub 3 After the hub has passed its self test you are ready to mount the hub Before mounting the hub unplug it Installing the Hub Installing the Hub 1 7 3 Mount the hub The HP AdvanceStack Hub 16U can be mounted in three ways in a rack or cabinet on a wall on a table The hardware for mounting the hub is included in the accessory kit 5063 5995 packed with the hub If you are mounting the hub to a wall use
21. aler or the nearest HP Sales and Support Office In addition the HP Network Phone In Support NPS service provides expert technical assistance for U S A customers through an NPS contract or at an hourly rate 1 800 790 5544 Monday through Friday 5 am to 6 pm PST Troubleshooting Troubleshooting 2 14 3 Hub Reference Front of the Hub Back of the Hub Hub Operation Front of the Hub Hub status LEDs The hub status LEDs indicate whether the hub is functioning properly For further details on error conditions indicated by the Status LEDs see chapter 2 Troubleshooting LED State Meaning of LED Power green On The hub is receiving power Off The hub is not receiving power Activity green Flickering ON while a packet is being transmitted Normally the LED appears to flicker In heavy traffic it may appear on all the time Collision orange Flickering This LED is on while a collision is detected on any of the attached cable segments If collisions are infrequent which is normal the light may be imperceptible In a network with heavy traffic the LED will glow and flicker dimly indicating collisions are occurring If it appears on continuously with no flicker it is a possible indicator of a network fault See chapter 2 Troubleshooting Hub Reference Hub Reference 3 2 Port status LEDs The following table provides LED port information If an HP AdvanceStack 8U 16U SNMP modul
22. anadian EMC Class A requirements Immunity See the Declaration of Conformity for details at the end of the Regulatory Statements in this guide Safety IEC950 EN6095D UL1950 CSA950 NOM 019 SCFI 1993 Specifications Specifications B 2 Safety and Regulatory Statements Safety Information Safety Symbols 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 Do not proceed beyond a WARNING or CAUTION notice until you have understood the hazardous conditions and have taken appropriate steps Grounding These are safety class I 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 If your LAN covers an area served by more than one power distribution system be sure their safety grounds are securely interconnected LAN cables may occasionally be subject to hazardous transient voltages such as lightning or disturbances in the electrical utilities power grid Handl
23. dvanceStack 8U 16U SNMP Module ASCII console null modem cable Installing the Hub Installing the Hub 1 4 HP Transceiver Modules The HP Transceiver Modules provide additional connectivity choices from the hub to Ethernet networks The following optional transceivers provide these additional connectivity options The HP AdvanceStack 8U 16U SNMP Module and HP Transceiver Modules and their cabling configurations are described in their accompanying documentation HP Transceiver Module HP J2608A ThinLAN Transceiver Module for 10Base 2 networks HP J2606A Fiber Optic Transceiver Module for 10Base FL networks HP J2607A Twisted Pair Transceiver Module for 10Base T networks HP J2609A AUI Port Module for connecting a standard IEEE 802 3 external transceiver to the hub Installing the Hub Installing the Hub 1 5 2 Verify the hub s operation To provide power to the hub follow these steps 1 Plug the power cord into the hub s power cord receptacle and into an ac power source N o t e If your installation requires a different power cord than the one supplied with the hub be sure to use a power cord displaying the mark of the safety agency that defines the regulations for power cords in your country The mark is your assurance that the power cord can be used safely with the hub N o t e The hub does not have a power switch it is powered on when the power cord is plugged in Power receptacle on the b
24. e 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 products do not have a power switch they are powered on when the power cord is plugged in Safety and Regulatory Statements 2 Informations concernant la s curit Symboles de s curit Symbole de r f rence la documentation Si le produit est marqu de ce symbole reportez vous la documentation du produit afin d obtenir des informations plus d taill es WARNING Dans la documentation un WARNING indique un danger susceptible d entra ner des dommages corporels ou la mort CAUTION Un texte de mise en garde intitul CAUTION indique un danger susceptible de causer des dommages l quipement Ne continuez pas au del d une rubrique WARNING ou CAUTION avant d avoir bien compris les conditions pr sentant un danger et pris les mesures appropri es Cet appareil est un produit de classe I 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 m
25. e is installed additional LED states may be observed For information about the hub LEDs when an HP AdvanceStack 8U 16U SNMP Module is installed see the manual accompanying the module LED State Meaning of LED AUI Xcvr Port green On An optional HP Transceiver Module is properly installed in the hub s front panel slot Off An HP Transceiver Module is not installed Slow Flash The HP Transceiver Module port has auto partitioned See Auto Partitioning later in this chapter Twisted pair Port green On Link beat is detected from the attached node Off The port is not receiving the link beat signal from the attached node Slow Flash The port has been auto partitioned See Auto Partitioning later in this chapter The slow flash is approximately once every 1 5 seconds AUI Xcvr Slot The AUI Xcvr Slot is used to add an HP Transceiver Module For more information see the Install Add in Modules section in chapter 1 Back of the hub The management slot is used to add an HP AdvanceStack 8U 16U SNMP Module For more information see the Install Add in Modules section in chapter 1 Hub Reference Hub Reference 3 3 Hub Operation The HP AdvanceStack Hub 16U is a multiport repeater that conforms to the IEEE 802 3 repeater specification Data signals coming into the hub from any of its ports are automatically regenerated and transmitted to all the other hub network ports The hub rege
26. entaci n hasta haberse subsanado el problema Puesta a tierra del cable de la red local LAN Si la LAN 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 Es posible que los cables de la LAN se vean sometidos 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 de la 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 Safety and Regulatory Statements 6 Safety Information Safety and Regulatory Statements 7 Regulatory Statements FCC Statement For U S A Only Federal Communications Commission 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
27. ingdom U S Canada 8120 1369 8120 2956 8120 1689 8120 4753 8120 2104 8120 1351 8120 1378 accessory kit two mounting brackets four rubber feet one tie wrap four 3 8 inch M3 machine screws four 5 8 inch number 12 24 screws Installing the Hub Installing the Hub 1 2 1 Install add in modules optional The Hub 16U can be custom configured by installing an optional HP AdvanceStack 8U 16U SNMP Module or an HP Transceiver Module It may be more convenient to install these optional modules before installing the hub into a rack or other location Inspect your installation site and identify whether the hub s module slots will be accessible HP AdvanceStack 8U 16U SNMP Module By installing an optional HP J3313A AdvanceStack 8U 16U SNMP Module you can configure monitor and troubleshoot the hub from a PC running the ASCII console software or HP Interconnect Manager WA R N I N G Disconnect the power cord from the hub before installing the HP SNMP or HP Transceiver modules Electrical shock or other injury may result if you attempt to install the module without disconnecting the power cord HP AdvanceStack 8U 16U SNMP Module Installing the Hub Installing the Hub 1 3 The PC serves as a console that enables you to configure monitor and troubleshoot the hub For more information about the ASCII console commands see the documentation accompanying the optional HP A
28. ionally if you have a HP AdvanceStack 8U 16U SNMP Module installed you can use ASCII console software for certain diagnostic functions to troubleshoot the hub Troubleshooting Approaches There are three primary ways to diagnose hub problems By checking the LEDs on the front of the hub as described in Diagnosing with the LEDs later in this chapter By visually inspecting the unit and all its connections as described in the Installation Problems and Cabling Problems sections later in this chapter By using the ASCII console s diagnostic functions as described in the documentation shipped with the HP AdvanceStack 8U 16U SNMP Module or HP Interconnect Manager and in the software s online help system Troubleshooting Troubleshooting 2 2 Diagnosing with the LEDs Most problems with the hub can be diagnosed using the LEDs on its front panel This section describes the normal LED pattern during self test and LED patterns that indicate error conditions on the hub LED Pattern During Self Test Whenever the hub is powered on or reset it performs a self diagnostic test During the self test all of the hub LEDs turn on for approximately three seconds If an HP Transceiver module is properly installed the AUI Xcvr LED stays lit If an HP Transceiver module is not installed the AUI Xcvr LED turns off When the self test completes successfully the LEDs go into their normal operational states If a hub hard
29. ise la terre ait t r par e Mise la terre du c ble de r seau local 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 convenablement interconnect es 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 Safety and Regulatory Statements 3 Hinweise zur Sicherheit Sicherheitssymbole Symbol f r Dokumentationsverweis Wenn das Produkt mit diesem Symbol markiert ist schlagen Sie bitte in der Produktdokumentation nach um mehr Informationen ber das Produkt zu erhalten WARNING Eine WARNING in der Dokumentation symbolisiert eine Gefahr die Verletzungen oder sogar Todesf lle verursachen kann CAUTION CAUTION in der Dokumentation symbolisiert eine Gefahr die das Ger t besch digen kann Fahren Sie nach dem Hinweis WARNING oder C
30. le management 1 12 cables bundling with a cable tie 1 12 cabling problems 2 6 network connections A 2 twisted pair connector pin outs A 3 collision detection 3 4 Collision LED 3 2 CompuServe obtaining files from 2 13 connections hub to hub networking 1 13 network 1 11 out of band management 1 3 connector specifications B 2 countries power cords for 1 2 customer service types of 2 11 D Declaration of Conformity C 9 diagnosing with the LEDs 2 3 diagnostic tests 2 7 testing the hub only 2 8 testing twisted pair cabling 2 8 E electrical specifications B 2 electromagnetic specifications B 2 environmental specifications B 2 Ethernet networks iii external power supply 1 2 F fax using to get HP product information 2 14 features hub v fiber optic backbone 1 16 front of the hub status LEDs 3 2 ftp obtaining files from HP 2 12 H hourly support calling for 2 14 HP AdvanceStack SNMP Module 1 3 LED pattern during self test 2 3 part of hub installation 1 3 HP FIRST FAX Retrieval Service using 2 14 HP FTP Library Service using 2 12 HP transceiver modules 1 5 hub at a glance iii connecting to fiber optic backbone 1 16 connecting to network backbones 1 15 connecting to ThinLAN backbone 1 15 description iii features v installing 1 2 mounting 1 8
31. lisions may occur because the hub cannot detect the presence of network traffic on that port and may thus transmit at inappropriate times A port may occasionally also become partitioned when network traffic is extremely heavy causing an abnormally high collision rate Link Beat Type 10Base T devices use a signal called link beat also called link test pulse This signal informs the hub of the presence of a device connected to it over twisted pair cable and of the integrity of the twisted pair link between them The hub will not transmit packets out of twisted pair ports that do not sense the link beat signal Hub Reference Hub Reference 3 5 A Cables and Connectors Recommended Cables Twisted Pair Cable Connector Pin Outs ThinLAN Requirements This appendix lists cables that have been tested and verified for use with the HP AdvanceStack Hub 16U 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 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 Recommended Cables Cable Function Cable Type
32. nected Proper network connections are described in chapter 1 Installing the Hub Properly connecting cables to the transceiver modules is described in the documentation that accompanies those modules If you are using the optional HP ThinLAN Transceiver Module be certain the thin coax segment attached to the port is properly terminated with a 50 ohm terminator at both ends as described in the manual accompanying the transceiver module Troubleshooting Troubleshooting 2 6 Non standard Cables Mis wired cables may cause numerous network collisions and can seriously impair network performance Before connecting cables into your network you should verify that they comply with the applicable standards For a list of compatible cables and a description of the pinouts for each port on the hub which can be used to confirm the compatibility of unlisted cables see appendix A Cables and Connectors Topology It is important to make sure you have a valid network topology Common topology faults include excessive cable length and excessive repeater delays between nodes If you have trouble after recent changes to a network switch back to the previous topology If you no longer have any trouble the new topology is probably at fault Refer to the guide entitled Designing HP AdvanceStack Workgroup Networks for topology configuration guidelines Contact your HP authorized LAN dealer or local HP sales office to get a copy of thi
33. nerates 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 The hub also performs collision detection A collision occurs when two nodes try to transmit at the same time When the hub detects a collision 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 resumed Hub Reference Hub Reference 3 4 Auto Partitioning The hub will automatically partition temporarily disable one of its ports if a collision condition exists for an excessive duration between 1024 and 2048 bit times or occurs during each of 32 consecutive attempts to transmit The hub monitors the partitioned port and automatically re enables the port when a minimum length packet can be successfully transmitted or received without a collision occurring Excessive collisions may be caused by faulty wiring If a port s transmit Tx wires have been shorted to the receive Rx wires of any port a collision will be detected when that port attempts to transmit If a port s receive Rx wires are not connected properly col
34. ng with the LEDs earlier in this chapter to interpret the LED display C a u t i o n Cycling power on the hub will temporarily disable the network and could have other adverse effects Testing Twisted Pair Cabling The twisted pair cable attached to the hub must be compatible with the IEEE 802 3 Type 10Base T standard To verify that your cable is compatible with this standard you can use the HP J2263A Cable Test Set The older HP 28687A Wire Test Instrument can also be used HP also offers a wire testing service Contact your HP authorized LAN dealer or your local HP sales office for more information Troubleshooting Troubleshooting 2 8 Testing End to End Network Communications Both the hub and the cabling can be tested by running an end to end communications test a test that sends known data from one network device to another through the hub such that you can verify that the data was correctly transmitted between the devices For example if you have two PCs on the network that have HP LAN adapter cards you can use the Link Test option from the card s test program to verify the entire communication path between the two PCs In the following illustration two computers are connected together with twisted pair cable to two different ports on the hub See your LAN adapter card s manual for information on running an end to end communication test PC sending test packets PC responding to the test packets
35. nsceiver port has been auto partitioned because of too many collisions Check cable terminations connections SQE setting on any external transceivers and status of attached network devices for causes of the excess collisions ON After self test all ports are ON for an extended period of time The hub has failed its self test Power cycle the hub If this condition persists call your HP authorized LAN dealer or HP representative for assistance This LED is not important for the diagnosis Troubleshooting Troubleshooting 2 5 Installation Problems By carefully following the installation procedures described in chapter 1 Installing the Hub you can avoid most problems caused by improper installation of the hub or one of its components Incorrect Hardware Installation Incorrectly installing the hub power cord the HP AdvanceStack 8U 16U SNMP module or a transceiver module can result in one or all of these components malfunctioning or not functioning at all If one or all of these components appear to not be functioning re check the installation procedure and if necessary re install the component correctly Cabling Problems A high percentage of network problems are due to faulty cabling Cabling problems usually result in the failure of a hub to connect to a network another hub or the end nodes Connections All cables attached to the hub should be checked to see that they are properly con
36. op hole for attaching an included cable tie to bundle the twisted pair cables away from the hub Installing the Hub Installing the Hub 1 12 Connecting Hubs Together Twisted Pair Cascade Connections To expand your network the hub can be connected to other hubs by using the Media Dependent Interface MDI switch The MDI MDI X switch controls how the signals are sent through the twisted pair cable connected to Port 16 The hub is shipped with the switch in the MDI X position The switch is a push push switch with two positions In the MDI position use Port 16 to connect your hub to another hub In this position the hub reverses the Tx and Rx port pairs for you This allows you to use straight through cable rather than cross over cable to connect two hubs together The cable can be up to 100 meters in length In the MDI position the switch is exposed by 0 06 inches 1 5 mm in front of the bezel In the MDI X position use Port 16 to connect your hub to a PC or similar device using straight through cable In the MDI X position the switch is exposed by 0 2 inches 5 mm in front of the bezel C a u t i o n You must disconnect the device connected to Port 16 before changing the position of this switch If you push the MDI MDI X switch and change its position while your network is running the hub or PC connected to Port 16 will be disrupted To restore your network push the MDI MDI X switch in again MDI MDI
37. reference 3 2 ThinLAN connections 1 14 troubleshooting 2 2 Index 2 Index hub operation auto partitioning 3 5 collision detection 3 4 description 3 4 link beat 3 5 verifying 1 6 hub to hub network connections with the MDI switch 1 13 I IEEE 802 3 Type 10Base T standard iii included parts 1 2 installation problems 2 6 installing the hub mounting procedures 1 8 network connections 1 11 out of band management connections 1 3 summary of steps 1 2 verifying hub operation 1 6 Internet obtaining latest drivers from 2 12 obtaining software from 2 11 L LAN adapter cards to test end to end communications 2 9 LEDs Activity 3 2 AUI Xcvr 3 3 Collision 3 2 diagnosing the hub status 2 3 pattern during self test 2 3 patterns showing error conditions 2 4 Power 3 2 twisted pair ports 3 3 verifying hub operation 1 7 link beat description 3 5 list included parts 1 2 M managing the hub 1 3 MDI switch using 1 13 MDI X switch using 1 13 mounting bracket for cable management 1 12 mounting the hub 1 8 in a rack or cabinet 1 9 precautions 1 8 N network backbones 1 15 network connections hub to hub connections 1 13 port connections 1 11 O operation of the hub description 3 4 out of band management connecting to the hub 1 3 P partitioning au
38. s guide Unusual Network Activity Network activity that exceeds accepted norms often indicates a hardware problem with one or more of the network components possibly including the hub Unusual network activity is usually indicated by the LEDs on the front of the hub or measured with one of the diagnostic tools in the ASCII console software Refer to Diagnosing with LEDs earlier in this chapter for information on using LEDs to identify unusual network activity Diagnostic Tests If you have an HP AdvanceStack 8U 16U SNMP module installed into the hub the ASCII console software or HP Interconnect Manager provides tests and indicators that can be used to monitor the hub and its network Troubleshooting Troubleshooting 2 7 connections See the documentation shipped with the HP AdvanceStack 8U 16U SNMP module and the software s online Help system for more details about these tests and indicators Testing the Hub Only If you believe that the hub is not operating correctly you can test the hub s circuitry by resetting the hub through one of these procedures Unplug the power cord from the hub and plug the power cord into the hub again If an HP AdvanceStack 8U 16U SNMP module is installed select the Reset option from the ASCII console Each of these procedures will power cycle the hub and execute its self test If all of the Port LEDs stay on after 3 seconds the hub may have failed its self test See Diagnosi
39. serially connect an ASCII console to the module to configure monitor and troubleshoot the hub An AUI Xcvr Slot in the front of the hub for several types of transceiver modules including ThinLAN AUI twisted pair and fiber optic With the optional ThinLAN transceiver you can hot swap a hub Hot swap means that removing a hub connected to other hubs through the ThinLAN transceiver does not bring down the network you can upgrade or replace hubs in a stack with the network up and running All modules with an external transceiver allow you to connect to an Ethernet IEEE 802 3 LAN The twisted pair module adds another RJ 45 port for a total of 17 twisted pair ports on the hub The fiber optic module allows you to connect your hub to a fiber optic backbone Modular Easy to Use Design LEDs showing power activity collisions and port status provide quick easy to read hub status information and troubleshooting assistance Metal brackets included with the hub that can be easily attached to the hub for mounting the hub in a standard 19 inch telco rack or on a wall Standards Based Compatibility Compatible with the IEEE 802 3 Type 10Base T standard to support both 802 3 and Ethernet networks v Table of Contents 1 Installing the Hub Installation Summary 1 2 Included Parts 1 2 1 Install add in modules optional
40. ste 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 esclusivamente da personale specializzato Questo apparato non possiede un commutatore principale si mette scotto tensione all inserirsi il cavo d alimentazione Safety and Regulatory Statements 5 Consideraciones sobre seguridad S mbolos de seguridad S mbolo de referencia a la documentaci n Si el producto va marcado con este s mbolo consultar la documentaci n del producto a fin de obtener mayor informaci n sobre el producto WARNING Una WARNING en la documentaci n se ala un riesgo que podr a resultar en lesiones o la muerte CAUTION Una CAUTION 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 WARNING o CAUTION hasta no haber entendido las condiciones peligrosas y haber tomado las medidas apropiadas Este aparato se enmarca dentro de la clase I 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 alim
41. sting the hub 2 8 testing the twisted pair cables 2 8 topology faults 2 7 unusual network activity 2 7 twisted pair cable hub to computer connection A 3 pin assignments A 4 pin outs A 3 testing 2 8 using a cable tie with 1 12 twisted pair ports LED description 3 3 U unusual network activity 2 7 V verifying hub operation 1 6 W World Wide Web obtaining software from 2 11 WWW obtaining software from 2 11 Index 4 Index Technical information in this document is subject to change without notice Copyright 1996 Hewlett Packard Company Printed in U S A 2 96 Manual Part Number J2611 90101 J2611 90101
42. talling the Hub Installing the Hub 1 8 Rack or Cabinet Mounting Wa r n i n g The rack or cabinet should be adequately secured to prevent it from becoming unstable and or falling over 1 Using a flat headed or Torx T 10 screwdriver attach the mounting brackets to the hub with 10 mm M3 screws included in the 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 3 Then attach the hub to the rack with 5 8 inch number 12 24 screws included in the accessory kit with a Phillips crosshead screwdriver Some cabinets require number 10 32 screws instead available as part number 2680 0302 Make sure you have screws that fit your cabinet or rack before mounting the hub 5 8 inch number 12 24 screws Mounting bracket Front facing out 10 mm M3 screws Installing the Hub Installing the Hub 1 9 Wall Mounting 1 Using a flat headed or Torx T 10 screwdriver attach the mounting brackets to the hub with 10 mm M3 screws included in the accessory kit Then attach the hub to a wood surface minimum 1 2 inch plywood or equivalent with 5 8 inch number 12 wood screws included in the accessory kit with a Phillips crosshead screwdriver Table Mounting To place the hub on a table or other horizontal surface
43. tomatic partitioning of ports 3 5 parts list 1 2 physical specifications of hubs B 2 port LEDs twisted pair 3 3 ports connection procedures 1 11 power LED pattern during 2 3 power cord plugging into the hub 1 6 plugging into the wall 1 6 Power LED 3 2 precautions for mounting the hub 1 8 procedures hub installation 1 2 network connections to the hub 1 11 network port connections 1 11 Index Index 3 R rack mounting instructions for 1 9 recommended cables A 2 Regulatory statements C 8 replacement of the hub 2 10 resetting the hub troubleshooting procedure 2 8 RJ 45 jack 1 11 S Safety information C 2 specifications connectors B 2 electrical B 2 electromagnetic B 2 environmental B 2 physical B 2 status LEDs description 3 2 summary installation steps 1 2 T technical support types of 2 11 terminator for a thin LAN segment 1 15 testing twisted pair cabling 2 8 ThinLAN backbone 1 15 ThinLAN connections 1 14 ThinLAN port and 50 ohm terminator 1 15 cable requirements A 4 topology faults 2 7 transceiver modules 1 5 part of hub installation 1 3 troubleshooting approaches 2 2 cabling problems 2 6 diagnosing with the LEDs 2 3 diagnostic tests 2 7 installation problems 2 6 LED pattern during power on 2 3 LED patterns showing errors 2 4 te
44. ware fault exists the hub will not complete self test This will be indicated by an abnormal LED pattern The display of the Port LEDs depends on whether the HP AdvanceStack 8U 16U SNMP Module is installed If you have an HP AdvanceStack 8U 16U SNMP Module installed see the manual provided with the module for LED information The tables on the following two pages list the hub s LEDs their possible states and diagnostic tips to resolve any error conditions These tables assume an HP AdvanceStack 8U 16U SNMP Module is not installed Troubleshooting Troubleshooting 2 3 LED Error Indications LED patterns indicating problems Diagnostic Tips Power Collision AUI Xcvr Port Twisted Pair Port OFF Verify that the power cord is plugged into an active power source and to the hub Make sure these connections are snug Try power cycling the hub by unplugging and plugging the hub back in If the Power LED is still not on verify the ac source works by plugging another device into the outlet Or try plugging the hub into a different outlet or try a different power cord If this condition persists call your HP authorized LAN dealer or HP representative for assistance ON OFF Check cabling on the indicated port all the way out to the device attached to that port Faulty wiring or a bad connection could exist somewhere in that connection The end node or hub attached to the port is off If you have an HP
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