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D-Link DE 1824Ei (DE-1824EI) Networking Hub

1. ip trap manager address community Adds the host at address to the hub s SNMP trap manager list Traps sent to the host will use community name community which may be a string up to 32 characters long node age timern Sets the hub s node age timer to n seconds Node aging is used with the hub s security option to determine how long to keep entries in the node tracking table Boot Configuration File C 3 10BASE T Stackable Hubs CABLES AND CONNECTORS Ports 2 through 24 are MDI X 1OBASE T Ethernet ports Port 1 is a 10BASE T Ethernet port with a sliding switch that enables a connection to a network station in the MDI X setting or to a repeater bridge or hub in the MDI setting 1OBASE T connections require a twisted pair cable a maximum of 100 meters long with RJ 45 connectors at both ends You can use shielded twisted pair cable or 0 4 0 6 mm 22 26 AWG 8 wire unshielded twisted pair cable for the connection The following diagram and table show a standard RJ 45 receptacle connector and its pin assignments Numbering of the pins and contacts shown in the diagram correspond to the entries in the subsequent table Only pin contact signals relevant to the hub are listed Figure D 1 RJ 45 Connectors RJ 45 Connector Contact MDI X Signal MDI Signal 1 TD transmit Cables and Connectors D 1 10BASE T Stackable Hubs 2 TD transmit 3 RD receive Not used Not used Not used 8 N
2. 10BASE T Stackable Hubs Intelligent Series User s Guide Rev 02w Oct 2004 6SNMPT 01 Printed In Taiwan RECYCLABLE 10BASE T Stackable Hubs FCC Warning This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this user s guide may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense CE Mark Warning 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 ii Table of Contents 10BASE T Stackable Hubs TABLE OF CONTENTS ABOUT THIS GUIDE iissvcits ccviccsractvistscctvastsnctvacdsnatsiunsedteacnts vi Overview of the User s Guide sccesccesccsseesceeseeeeeseeesceeeeeseeeseceseenseenaeenae vi INTRODUCTION icctiecsucctcoxivestarccsesiaentansuaersucaviscsuessiescneuens 1 1 OVERVIEW desire esas nhs soibin Luding E E l 1 Media Connection Flexibility cece eeseeeecneeesseeseeeceesesesseesee
3. DRM Data Rate Mismatch counts events where there is a frequency mismatch between the received signal and the hub s internal clock This may indicate a hardware problem in the hub or in an Ethernet interface SFD Missing counts frames longer than 10 bytes without a valid Start of Frame Delimiter Readable Frame counts valid frames e Multicast Frame counts valid frames that are sent to multicast Ethernet addresses Using the Console Interface 6 23 10BASE T Stackable Hubs Broadcast Frame counts valid frames that are broadcast to all stations on the network 64 Octs 65 127 Octs 128 255 Octs 256 511 Octs 512 1023 Octs 1024 1518 Octs Counts frames of various length ranges both valid and invalid Readable Oct counts the total number of bytes octets included in valid readable frames Total Errors sum of the FCS Error Alignment Error Too Long Frame Short Event Late Event Very Long Event and Data Rate Mismatch counters Intelligent Stackable Hub Network Monitoring Port Statistics Current Group ID 7 Current Port ID 1 Pkts Pkts Sec Frames Too Long 0 Readable Frames a Multicast kts Sec PI e 8 Broadcast a Octs i 69 127 Octs a 128 255 Octs 35 f 8 0 s 256 511 Octs 912 1023 Octs 1024 1518 Octs 37618 Octs icts Sec Readable Octs 72238869 DRM SFD Missing Errs rrs Sec Next Monitoring Group ID H Total Errors 103 8 Next Monitoring Port I
4. 10BASE T Stackable Hubs 240VAC 240VAC 240VAC 20W Max 50W Max 20W Max 50 60 Hz 50 60 Hz 50 60 Hz 240VAC 50W Max 50 60 Hz 2 8kg Weight Dimensions Operating Temperature 441mm x 44 4mm x 217mm 0 to 50 C FCC Class A CE VCCI Level 1 RFC 1157 SNMP RFC N A Yes N A Yes 1155 SMI RFC 1213 MIB II RFC 1368 Repeater MIB SNMP Proprietary MIB In band Management Yes Qut of band Management Yes Management CPU N A Yes N A IDT 79C3041 Boot EPROM 128K Flash Memory for 256K 512 Firmware K Memory Master or Passive in Master Master Cascading A 2 Specifications 10BASE T Stackable Hubs POWER ON SELF TEST When the master hub is powered on it does a Power On Self Test POST to verify that all of its components are working properly As it performs its tests the test progress is displayed on the terminal console provided the hub is in console mode If the hub is in Out of band management mode the console display will be omitted the progress of the diagnostic self test will still be displayed on the front panel indicators A typical boot up console display is shown below INTELLIGENT STACKABLE HUB POWER ON SELF DIAGNOSTIC PROM Checksum Test 2020 2 2 2 ee PASSED DRAM 01024 KByte 900 ee PASSED LED Display Test 2022 ee PASSED E2PROM Integration Checksum ae PASSED 29F040 512 Kbytes Flash Memory Installed PASSED Netw
5. HJ Port ID 1 27 1 1 Connector Type RJ 45 Port Status Port State Link Test U Link Test State lt Enable gt p Receive Polarity Normal Polarity Reversal lt Disable gt Auto Partition Off Admin State lt Enable gt PREV GROUP NEXT GROUP PREY PORT NEXT PORT HELP SAVE EXIT Figure 6 15 Port State Menu You can use the PREV GROUP and NEXT GROUP commands to switch to another hub or the PREV PORT and NEXT PORT commands to switch to another port You can also enter the port s Group ID and Port ID numbers Segmenting Hubs Normally all hubs in the stack are connected together into a single Ethernet collision domain through the daisy chain connections However in some applications you may want to separate the hubs into separate collision domains while keeping them in the same stack for management purposes For instance you may want to segment your network by connecting separate workgroups to separate segmented hubs in the stack and bridge the segments together using a switching hub 6 20 Using the Console Interface 10BASE T Stackable Hubs To segment an individual hub from the rest of the stack m Enter the Port State Menu Screen accessible from the Network Monitoring Menu 19 Select the Group ID of the hub you wish to segment 3 Select Port 25 for the 24 port hub models or Port 13 for the 12 port hub models This port number represents the hub s Ethernet link to the daisy chain Chang
6. These separate segments can be bridged by connecting them to separate ports of an Ethernet switching hub Building Hub Stacks 4 5 10BASE T Stackable Hubs Huy Huby a Hubs ey NS Kup 4 Huh 5 a One Collision Domain Figure 4 3 All Hubs Connected to Ethernet Backbone g a A A Figure 4 3 shows an unsegmented stack of hubs All hubs in the stack are in the same collision domain because they are connected together using the daisy chain ports and they have not been segmented Figure 4 4 shows a stack divided into three separate collision domains Hubs 4 and 5 are isolated from Collision Domain 1 hubs 1 2 and 3 using the hub segmentation capability putting them into their own isolated Collision Domains 2 and 3 respectively A switch bridge or router can be used to connect the three collision domains so that traffic can pass between them yet keeping them isolated to reduce congestion on each segment Without an additional connection none of the three Collision Domains will be able to pass traffic across domains however using a pass through cable to cascade the domains would negate their usefulness as separate segments 4 6 Building Hub Stacks 10BASE T Stackable Hubs Huby Huby go Hubs Dh S CR Kup 4 Fes Hubs D amp a l amp j Collision Domain 1 a A solated Collision Domain 2 Isolated Collision Domain 3 Figure 4 4 Three Separate Collision Domains When a hub is segmented
7. e g the terminal program included with the Windows operating system using an RS 232C serial cable Your terminal parameters will need to be set to VT 100 ANSI compatible Arrow keys enabled 9600 baud Using the Console Interface 6 1 10BASE T Stackable Hubs You can also access the same functions over a Telnet interface Once you have set an IP address for your hub you can use a Telnet program in a VT 100 compatible terminal mode to access and control the hub All of the screens are for the most part identical whether accessed from the console 8 data bits No parity One stop bit port or from a Telnet interface Console Usage Conventions The console interface makes use of the following conventions 1 2 6 2 Items after a colon are read only values displayed for information purposes The cursor cannot be moved to these items Items in lt angle brackets gt can be toggled on or off using the space bar Items in square brackets can be changed by typing in a new value You can use the backspace and delete keys to erase characters behind and in front of the cursor The up and down arrow keys the left and right arrow keys and the tab key can be used to move between selected items The currently selected item will be shown in reverse video Items in UPPERCASE are commands Moving the selection to a command and pressing Enter will execute that command Using the Conso
8. Class A network 255 255 0 0 for a Class B network and 255 255 255 0 for a Class C network 6 6 Using the Console Interface 10BASE T Stackable Hubs Default Gateway IP address that determines where frames with a destination outside the current subnet should be sent This is usually the address of a router or a host acting as an IP gateway If your network is not part of an internetwork or you do not want the hub to be accessible outside your local network you can leave this field blank Send BOOTP Request Upon Power Up determines whether the hub should send out a BOOTP broadcast request when it is powered up The BOOTP protocol allows IP addresses network masks and default gateways to be assigned on a central BOOTP server if this option is set the hub will first look for a BOOTP server to provide it with this information before using the supplied settings 3 MS DOS PER VTERM a sja Ale Intelligent Stackable Hub TCP IP Parameters Configuration Menu Interface MIME gt Current Setting Address 202 39 74 28 Subnet Mask 299 299 299 0 Default Gateway 202 39 74 1 System Restart Setting IP Address 202 39 7 Subnet Mask 259 295 255 0 Default Gateway 202 39 74 1 4 28 Send BootP Request Upon Power Up lt No gt HELP SAVE EXIT Figure 6 4 TCP IP Parameters Using the Console Interface 6 7 10BASE T Stackable Hubs Out of band management and console settings You can use the Out of Band
9. Do not disconnect the female connector from the hub to power off the hub 3 2 Setting Up the Hub 10BASE T Stackable Hubs Free standing Installation If you are installing the hub as a free standing unit apply the four self adhesive rubber feet to the bottom of the hub chassis Make sure the bottom surface of the chassis is clean and dry Stand the chassis up on end and attach one rubber foot about 1 inch from each corner Rack Mounting The hubs can be used standalone on a tabletop or shelf or mounted in a rack When mounting the hub stack in a rack confirm that the rack is an EIA standard 19 inch rack For rack mounting convenience a pair of mounting brackets is included in the package Attach the mounting brackets with the enclosed machine screws and then mount the hub in the rack using screws included with the rack Vie fe A Figure 3 1 Rack Mounting Setting Up the Hub 3 3 10BASE T Stackable Hubs Installing the Transceiver Tray At the rear of the hub there is an AUI connector designed for connecting the hub to various types of Ethernet media such as thick Ethernet coaxial cable 1OBASE5 thin Ethernet coax LOBASE2 or fiber optic cabling LOBASE FL The AUI connector is recessed allowing most types of transceivers otherwise known as Media Access Units or MAUs to be installed partially recessed within the rear panel of the hub To make inserting and removing the transceiver easier a transceiver tr
10. Other manageable models only The indicator lights amber when other types of Ethernet errors occur Utilization The utilization bar graph displays the percentage utilization of Ethernet bandwidth comparing the amount of data being transmitted over the network with the maximum amount possible All received Ethernet frames are counted whether they were valid or not The hub updates this display every 0 5 seconds HUB ID The HUB ID display indicates the Unit ID of the hub In a hub stack each hub unit should have a unique ID The hub is capable of automatically setting the hub ID freeing you from having to do so Using the console interface you can turn on Group ID flashing which will make the hub ID indicator flash off and on This may be useful for identifying a specific hub or a hub stack within a large bank of hubs Segmented The Segmented indicator lights when the entire hub has been manually segmented off from the rest of the network Normally the hubs are 2 6 External Features and Indicators 10BASE T Stackable Hubs connected together into a single Ethernet collision domain through the daisy chain connectors on the back Segmenting a hub places it in its own collision domain while allowing it to be managed with the rest of the stack External Features and Indicators 2 7 10BASE T Stackable Hubs 2 8 Daisy chain in out The down arrow indicates that another hub in the stack is connected t
11. as explained in Appendix D A more convenient method is to use the hub s Uplink switch The Uplink switch lets you use Port 1 as either an ordinary MDI X port for connecting to a server or workstation or as an MDI port for connecting to another hub Network Connections 5 3 10BASE T Stackable Hubs This means you can cascade to another hub using an ordinary straight through twisted pair cable Enable port 1 Enable port 1 for switch bridge hub for workstation Figure 5 2 Uplink Switch Setting When using this method set the Port 1 Uplink switch to MDI connect one end of the straight through cable Port 1 of the hub and connect the other end of the cable to an ordinary non uplink port on the other repeater hub or Ethernet switch Don t try to cascade more than four repeater hub stacks in a line using twisted pair cabling Instead use a multilevel cascading scheme as discussed in the Multilevel Cascading section below Figure 5 3 Connection Through Port 1 5 4 Network Connections 10BASE T Stackable Hubs Using Thin Coaxial Cabling With the addition of a 1OBASE2 transceiver connected to the AUI port at the rear of the hub as described in Chapter 3 you can cascade the hub to other hubs or stations using thin coaxial cabling This method of cascading hubs gives additional flexibility over using twisted pair cable since you can cascade up to thirty hubs on a single thin coaxial cable segment The entire coaxial seg
12. band mode Legal values for the parameter n are 1200 2400 9600 and 19200 snmpt image string Takes string which may be up to 64 characters long as the filename on the TFTP server of the image file to be used When the hub boots it will load the given image file from the server and execute it This command may be used to update the hub s software when a new version is available from SNMP ip netmask mask Uses mask as the network mask for the local network The mask should be in the form xxx xxx xxx xxx where each xxx is a number between 0 and 255 For a class C network with no subnetting the netmask should be 255 255 255 0 ip default address Uses address as the hub s IP address The address should be in the form XXX XXX XXX XXX Where each xxx is a number between 0 and 255 auth t rap enable disable C 2 Boot Configuration File 10BASE T Stackable Hubs Enables or disables authentication failure traps for invalid SNMP community names The argument may be enable or disable clear SNMP comm tabl Clears the hub s SNMP community name table SNMP community community permissions Adds community to the hub s list of SNMP communities with access permissions The community name can be up to 32 characters long Permissions can be read for read only community access or write for read write community access clear ip trap manager table Removes all entries from the hub s trap manager list
13. gt lt Invalid gt HELP SAVE EXIT Figure 6 9 SNMP Manager Setting Menu Using the Console Interface 6 13 10BASE T Stackable Hubs Adding and Deleting Users Access to the console whether using the console port or via Telnet is controlled using a user name and password Up to three of these user names can be defined One user named SNMP is defined by default this user name can be removed if desired The console interface will not let you delete the current logged in user however in order to prevent accidentally deleting all of the users with Super User privilege and making it impossible to change important hub settings Only users with the Super User privilege can add new and delete users To add a new user 1 Choose User Account Change from the main menu MS DOS EI VTERM ae S a S Ale Intelligent Stackable Hub User Account Change Menu reate New User Change Access Delete Users Change Password Figure 6 10 User Account Change Menu 1 Choose Create New User from the User Account Change menu 2 Enter the new user name and assign an initial password Determine whether the new user should have Super User or General User privileges 6 14 Using the Console Interface 10BASE T Stackable Hubs MS DOS 8 VTERM e al sja Alle Intelligent Stackable Hub User Account Change Create New User User Name its Password Confirm Password Access Level lt Super User gt HELP S
14. position in the hub stack Position Within the Stack Hubs in the hub stack are connected using the daisy chain ports located at the rear of the hub Each hub has an IN port and an OUT port Hubs are daisy chained together by connecting the OUT port of one hub to the IN port of the next hub in the chain A typical stack arrangement is shown below Daisy Chain In Out Figure 4 1 Typical Stack Arrangement All hubs connected directly or indirectly through the IN port of a hub can be considered upstream of that hub and all hubs connected directly or indirectly through the OUT port of the hub can be considered downstream If a hub does not have any upstream hubs it is at the head of the stack Master Hub Roles You can include more than one master hub in a hub stack This allows you to continue to manage the hub stack even if the management agent of one of the master hubs fails The hub currently managing the stack is called the Active Master and other master hubs in the stack are called Standby Masters If a master hub is at the head of the stack it automatically becomes the Active Master Otherwise it will wait for management commands from 4 2 Building Hub Stacks 10BASE T Stackable Hubs another master hub upstream If it receives commands from a master hub it becomes a Standby Master controlled by the Active Master If it does not receive any commands or if the Active Master hub fails it will become the Active
15. the line or a bad Ethernet interface Short Event counts events where less than 10 bytes are received and the frame start delimiter is invalid or where the start frame delimiter is valid but less than 2 bytes are received This may indicate noise on the line Late Event counts collisions that occur at or after the 64 byte octet in the frame This may indicate that delays on your Ethernet 6 22 Using the Console Interface 10BASE T Stackable Hubs are too long and you have either exceeded the repeater count or cable length specified in the Ethernet standard Runt Frame counts frames shorter than the 64 byte octet minimum defined by the Ethernet standard These are usually caused by collisions Collision counts collisions on the Ethernet segment FCS Error counts otherwise valid frames that fail the CRC check Alignment Error counts otherwise valid frames that did not end on a byte octet boundary Interframe Gap counts frames sent too close behind the previous frame a minimum of 8 1 microseconds of carrier is required between frames Jabber counts frames longer than the maximum 1518 bytes octets with either bad framing or an invalid CRC Auto Partition counts events where the port was partitioned off from the rest of the network due to excessive errors Fragment counts packets less than 64 bytes with either bad framing or an invalid CRC These are normally the result of collisions
16. to the connector of the power supply and connect the other end of the power cord to the AC supply source Figure 3 3 Replacing the Power Supply Setting Up the Hub 3 5 10BASE T Stackable Hubs BUILDING HUB STACKS You can combine up to eight hubs in the Intelligent Series into a single manageable hub stack Building a hub stack has two advantages All of the hubs can be managed as a single unit using a network management system or the console interface Up to 192 1OBASE T ports can be controlled and monitored from a single management screen Only one master hub is required less costly slave hubs can be used for the rest of the stack The entire hub stack counts as a single repeater hub when planning your network The Ethernet standard requires that there be at most four repeaters between any two stations on the network Using the hub s built in daisy chain ports allows you to link eight hubs together without violating the repeater count limitation This chapter tells about the various roles hubs in the stack can play how to connect the hubs using the Daisy Chain ports and how to divide hubs in the stack into separate segments Hub Roles The series supports both master and slave hubs In addition more than one master hub can be placed in a single hub stack Therefore a hub in the stack Building Hub Stacks 4 1 10BASE T Stackable Hubs can take on different roles depending on the type of hub it is and its
17. 05F4819 0 8 G0805F4819 0 8 FFFFFFFFFF 0 8 0 9 I4 FFFFFFFFFFF 39 254 148 202 33 ae 255 800h 040051582 06 OB8BC8256F8 OO80C83CASB OB8OC83E22RI 080809733C 8 23 2 1 170 880h 080009930046 G900AZ060AD1 39 254 228 ERIEN 80h 08002073AA93 0080C82084 02 39 74 53 202 39 74 8 8080h 6 BANTeSSRH PREV GROUP NEXT GROUP PREV PORT NEXT PORT EXIT Figure 6 18 Node Tracking Information A maximum of 12 entries can be displayed per port Entries older that the Mode Age Timer are removed the default value for this timer is 1 minute You can use the PREV GROUP NEXT GROUP PREV PORT and NEXT PORT commands to switch hubs or ports Using the Console Interface 6 25 10BASE T Stackable Hubs Resetting the Hub You can use the console interface to reset the hub stack either doing a System Reset which restarts the hub and is identical to powering the hub off and back on again or a Factory Reset which sets all of the hub s parameters to what they were when the hub was delivered from the factory System Reset To perform a System Reset 1 Choose System Reset from the main menu MS DOS 8 VTERM CREER Intelligent Stackable Hub System Reset Are you sure you want to reset I Yes Figure 6 19 System Reset 1 Move the cursor to Yes to confirm the reset and press Enter The hub should restart 6 26 Using the Console Interface 10BASE T Stackable Hubs Factory Reset Before performing a
18. 1 D 2 8 EA A A E EAEE AT Daisy chaining Hubs into a Hub Stack 4 4 Segmennne Hubs nriesanunaa r e a a E A EE E EN SS 4 5 NETWORK CONNECTIONS cccccssstessssteeessseeeessneeenssneeens 5 1 Connecting Stations to the Hub cccccsccssccceseeesseceeeceensecesnceesseceeneeenaeees 5 1 Cascading Hub Stacks sccesccescesseesseeseesseeeseneeceseceseceaecesecaeceeeasenseensees Using Twisted pair Cabling Using Thin Coaxial Cabling ceceeccesccsscecesececeeseceeceseceseeaeceeeeaeeeeeaeeeeeaes Using Fiber or Thick Coaxial Cabling cccceceeceseeceeeececeeteceeeeaeeeeceaeeneeeaees 5 6 Multilevel Cascading e s c cvescessscess cased aeien ae 5 6 USING THE CONSOLE INTERFACE ssssssesssseessseesseensees 6 1 Connecting to the HUD cis ssicsoiscsdecsccsatsistiesiesiassisnsvdeevserecssaceascbetsediaotase 6 1 Console Usage Conventions ccccccccceceesceescesscesscnsecnsecsseceeeasesssensees 6 2 Logging in to the Hub Console sc ecccesccesccsseesseeseeseeseeeseceeeceecnsecnseeaeens 6 3 Logging hasani ns Changing your Password Setting up the Master Hub soseseeeseeeeeseeseresrsreerrsrrrrssrrrrsresreseseess 6 6 TCP IP Settings Out of band management and console settings sseeeeeeeeererersrerrresrerererersee 6 9 Software Update Saa E tice sas E E A E R 6 9 SNMP Information SNMP Traps SNMP Security Community Names s sssssessssssssesesesesrersrsrsreresesrsrersrrersees 6 13 Adding and Deleting Users acarreo a
19. AVE EXIT Figure 6 11 Create New User 1 Choose SAVE and press Enter to let the user addition take effect 2 Choose EXIT to leave the Create New User menu To delete a user 1 Choose User Account Change from the main menu 2 Choose Delete Users from the User Account Change menu 3 Toggle the Delete field of the user you wish to remove to Yes Using the Console Interface 6 15 10BASE T Stackable Hubs MS DOS 8 VTERM l A ef AlE Intelligent Stackable Hub User Account Change Delete Users User Name Access Level Status Delete gt lt Active gt lt N A gt Ss SNHP T lt Super User gt lt Active gt lt No gt lt N A gt lt N A gt lt N A gt HELP SAVE EXIT Figure 6 12 Delete User 1 Choose SAVE and press Enter to let the user addition take effect 2 Choose EXIT to leave the Delete Users menu Hub Stack Configuration Several important hub parameters useful in the day to day management of the hub can be viewed and controlled using the Group Configuration Primary Backup Master Menu and Port State menus Primary and Backup Master Hubs The Primary Backup Hub screen accessible from the Network Monitoring menu is used to display the status of each of the master hubs in the stack The primary master hub is labeled Primary Master backup master hubs are labeled Backup Master and non functioning master hubs are labeled Down 6 16 Using the Console Interface 10BASE T Stackab
20. Console Setting menu to choose whether to use the hub s RS 232C serial port for console management or for out of band TCP IP communications using SLIP and to set the bit rate used for SLIP communications The following fields can be set System Restart Out of Band Baud Rate determines the serial port bit rate that will be used the next time the hub is restarted Applies only when the serial port is being used for out of band SLIP management it does not apply when the port is used for the console port Available speeds are 1200 2400 9600 and 19200 bits per second Out of Band Dial Up Phone Number stored as a reference for the benefit of the system manager does not actually cause the hub to dial out System Restart Serial Port Setting determines whether the serial port should be used for out of band SLIP management or for console management starting from the next time the hub is restarted 6 8 Using the Console Interface 10BASE T Stackable Hubs MS DOS 854 VIERM o sja ala Intelligent Stackable Hub Out of Band Console Setting Menu OQut of Band Setting Console Setting Protocol Baud Rate Baud Rate Character Size 8 Character Size Stop Bit 1 Stop Bit System Restart Qut of Band Baud Rate lt i gt ee eee Dial Up Phone Number 1 Current Serial Port Setting Console System Restart Serial Port Setting lt Console HELP SAVE Figure 6 5 Out of Band Console Setting Menu Software Upda
21. D 1 PREV GROUP NEXT GROUP PREY PORT NEXT PORT CLEAR COUNTER EXIT Figure 6 17 Port Statistics Display For the Segment Statistics display an additional item is displayed Interhub Collision counts the number of collisions that occur on the hub stack s internal management bus You can use the PREV GROUP NEXT GROUP PREV PORT and NEXT PORT commands to switch hubs or ports The CLEAR COUNTER command will start all of the counters over at 0 6 24 Using the Console Interface 10BASE T Stackable Hubs Displaying Node Tracking Information The Node Tracking Information screen accessible from the Network Monitoring menu displays the source and destination addresses of packets recently received on a given port Ethernet MAC addresses are displayed for all packets and IP addresses are displayed for packets conforming to the IP protocol The Type Len field is used to display the length field from the Ethernet frame values in hex represent protocol numbers and values in decimal represent the packet length Different network protocols assign different meanings to this field MS DOS EI VTERM Intelligent Stackable Hub Network Monitoring Node Tracking Information Group ID 7 Port ID 1 Source MAC Dest MAC Source IP Dest I Type Len GOGGA2ZC89C15 BO80C8O844 207 68 137 9 74 38 800h 5F4819BB 0080C82077 0 0 0 0 0 0 0 1034 C8084400 BOBANZC8IC 39 74 38 68 137 80h C80D51F0 0080SF4819 0 0 0 0 0 0 C8207777 008
22. E a EE 6 14 iv Table of Contents 10BASE T Stackable Hubs Hub Stack Configuration cccccccesccescesscesecsecsseeseeeseeeseeseeeseeeseeeeeaes 6 16 Primary and Backup Master Hubs eeecesceseeeceeeeecneesesseesseeseeseeneeseeaes 6 16 Controlling Hubs in the Hub Stack wo cies csesseeseeeceeceeeeteteeseeseeees 6 17 Controlling Individual Ports 0 0 eee seeesceeceeceecseeecseeseesceecessessesseesseessees 6 19 Sepmentins Hubs ie 40 4 aeaee E VEEE E ESEA RE I I ET RAN 6 23 Monitoring the Hub Stack sessseeeseeeeeeeeeseeesrsreesesrsreserrrssesressrseesrese 6 24 Displaying Segment Group and Port Statistics sseeseeeeeeesseseesseeereesrsrsese 6 21 Displaying Node Tracking Information 0 cccececeesseeseeseeseeesneeeteeseeseeees 6 28 Resetting the FU c cccs scesscsasseasinsscesscotssedoesesacssasasscabipsbsasacesnsesseesseseas 6 29 DYSLEM E E EE inceleosetunderssnceband tehusconesutes setarsaveguee wiettesrcetesesnades ces 6 29 Factory SRESCUs 55 s5ssscscuseres scccateasvohrascose saneoslcoenesueassuevenStacesinceshest R ea 6 30 SPECIFICATIONS ccccessseeeccesnseeecceenseeesecenseeeeeeenseesseeens A 1 POWER ON SELF TEST ssistensseccissutooctsnstscssebewenutebetsratens B 1 BOOT CONFIGURATION FILE scecssssseesesteeessseeessenens C 1 CABLES AND CONNECTORS ccccsssseeesssteeessneeensseeeesenens D 1 Crossover Cable irrien e Huai teehee ha eset Ha eS D 2 Daisy chain Cable ovis ciscssecsisas estate na EE EEE
23. EEA D 3 RS 232 DB Pin Specification cecccesccsseesseeseeeseeeseeseeeseeseseseeeseeesees D 3 Table of Contents v ABOUT THIS GUIDE This User s Guide discusses how to use Intelligent 1OBASE T Stackable Managed hubs This series includes the 12 24 port stackable managed master hub and the 12 24 port standard hub In this User s Guide the Intelligent Series stackable hubs are frequently described simply as hub or hubs wherever the text applies to both models Model numbers are normally used only to differentiate between models Overview of the User s Guide The User s Guide is divided into the following chapters and their related audiences Chapter 1 Introduction Describes the features of the Intelligent Stackable Managed Hubs Chapter 2 Indicators Introduces the layout of the hub s front panel rear panel and display indicators Chapter 3 Setting up the Hub Describes basic installation procedures for setting up the hub Chapter 4 Building Hub Stacks vi Table of Contents Chapter 5 Chapter 6 Appendix A Appendix B Appendix C Appendix D Table of Contents 10BASE T Stackable Hubs Describes how to stack master and slave hubs into an integrated hub stack Network Connections Describes how to connect workstations to the hub and the hub to other hubs and network components on a local area network Using the Console Interface Describes how to configu
24. Master Note that even if there are more than two master hubs in the stack the Standby indicator of the additional master hubs will not light However if the Active Master at the head of the stack fails the first Standby Master will become the Active Master and the next master hub will then become a Standby Master A master hub can only manage hubs that are downstream of it Therefore you should place the hub that you want to serve as the Active Master at the head of the stack If you want to use Standby Master hubs you should place them directly downstream of the Active Master Otherwise you will not be able to control or monitor any slave hubs upstream of the master hub Each master hub has its own IP address All master hubs respond to SNMP management commands though only the Active Master is capable of controlling and monitoring other hubs If the Active Master hub fails then you will need to use the IP address of the new Active Master to manage the other hubs in the stack Slave Hub Roles Slave hubs can operate standalone or can be a Managed hub controlled by an upstream Active Master hub If there are no master hubs in the hub stack or if the Active Master hub in the stack fails and there is no Standby Master hub to take its place the slave hubs will be Standalone hubs In a case where the Master Hub fails you should power the slave hubs off and then on again to insure they are in a valid state before using them as Stand
25. SE T Stackable Hubs When connecting a transceiver to the hub the transceiver s SQE heartbeat function should be disabled Multilevel Cascading Hubs can be cascaded in multiple levels provided no path between stations on the network goes through more than four repeaters For example a backbone level of hubs can be connected in a bus using 1OBASE2 cabling and second level workgroup hubs can be connected to the backbone hubs using twisted pair cabling This type of network layout allows a greatly expanded number of network nodes without sacrificing manageability Figure 5 4 Multilevel Cascading 5 6 Network Connections 10BASE T Stackable Hubs USING THE CONSOLE INTERFACE Your Intelligent stackable Ethernet hub supports a console management interface that allows you to set up and control your hub either with an ordinary terminal or terminal emulator or over the network using the TCP IP Telnet protocol You can use this facility to perform many basic network management functions In addition the console program will allow you to set up the hub for management using SNMP View or another SNMP based network management system This chapter describes how to use the console interface to access the hub change its settings and monitor its operation Connecting to the Hub You can use the console interface by connecting the hub to a VT100 compatible terminal or a computer running an ordinary terminal emulator program
26. Use Bootp to get IP after start up is enabled the pathname will be obtained from the BOOTP server For more information about SNMP configuration files consult Appendix C For detailed information about using the TFTP and BOOTP servers consult the SNMP View User s Guide MS DOS 84 VIERM o sja Alle Intelligent Stackable Hub Software Update Menu Software Update HN i sab e Software Update Mode lt Network gt Boot Protocol lt TFTP ONLY gt Boot Server IP Address 202 39 74 73 1 Boot File Name c snmpt snmpt cfg Last Boot Server IP Address 202 39 74 78 HELP SAVE EXIT Figure 6 6 Software Update Menu 6 10 Using the Console Interface 10BASE T Stackable Hubs SNMP Information The System Configuration Menu screen shows various pieces of information about your hub and allows you to set the System Name System Location and System Contact These settings can be retrieved from the hub using SNMP requests allowing these settings to be used for network management purposes Each of these fields can contain up to 64 characters System Name corresponds to the SNMP MIB II variable system sysName and is used to give a name to the hub for administrative purposes The hub s fully qualified domain name is often used provided a name has been assigned System Location corresponds to the SNMP MIB II variable system sysLocation and is used to indicate the physical location of the hub for administrative purp
27. alone hubs Standalone hubs all have a Hub ID of 0 As a standalone hub all ports will be enabled and settings such as hub segmenting intrusion security etc will have no effect Building Hub Stacks 4 3 10BASE T Stackable Hubs When there is a working Active Master in the stack then each slave hub in the stack will be a Managed hub controlled by the Active Master hub and will have its own Hub ID Hub ID Hub ID numbers displayed on the front of the hub are determined automatically by the master hub When the master hub starts up it begins to assign Hub ID numbers to all of the Standby Master and Managed hubs The master hub remembers the Hub ID associated with each hub in the stack and even if a hub is removed the other hubs will keep their original Hub IDs When you add a new hub to the stack the master hub will assign it an unused Hub ID Daisy chaining Hubs into a Hub Stack Hubs are daisy chained together using ordinary 4 pair Category 5 twisted pair cabling with RJ 45 connectors on each end A short 30cm daisy chain cable is included with the hub If you need to make a longer cable consult the pinout information in Appendix D The total length of all the cables measured from the first hub in the stack to the last must not exceed 100 meters Normally the master hubs are placed at the top of the stack The hub you intend to serve as Active Master should be on top and any Standby Master hubs should be immediate
28. articular voltage and current requirements The cord voltage and current ratings should conform to the standards of the country where you are using the hub When using a 230V power source within the U S use a UL listed power cord with the following characteristics 18 AWG Type SVT or SJT three conductor cord Maximum 15 feet in length Setting Up the Hub 3 1 10BASE T Stackable Hubs Tandem blade Grounding type attachment plug rated at 15 A 250V When using a 230V power source outside of the U S use a cord with the following characteristics 18 AWG Grounding attachment plug rated at 15A 250V The cord should have the appropriate safety approvals for the country where the equipment will be installed It should be marked HAR Be sure the operating environment for the hub is within the following ranges Temperature 32 to 122 F 0 to 50 C Humidity 5 to 95 non condensing Power Connection To connect power take the following steps 1 Plug the female IEC connector of the power cable into the power connector on the back of the hub Y Insert the three pronged plug on the power module cable into a non switched grounded power outlet on a wall a power strip or a grounded extension cord 3 When you plug in the power cable verify that the hub performs the self test to confirm the hub is operating correctly To power off the hub disconnect the male connector from the outlet
29. as Super User privileges Some menu selections available to users with Super User privileges may not be available to General Users The main menu shown below is the menu for users with Super User privileges MS DOS 8 VTERM e al sja Ale Intelligent Stackable Hub Main Menu TCP IP Parameters Configuration Network Monitoring Qut of Band Console Configuration User Account Change SNHP Trap Manager Configuration SNHP Manager Configuration System Reset Software Update Factory Reset NV RAM to Default Value Figure 6 2 Main Menu 6 4 Using the Console Interface LOGOFF 10BASE T Stackable Hubs Changing your Password To change your user password 1 Choose User Account Change from the main menu 2 Choose Change Password MS DOS 84 VIERM o sja Alle Intelligent Stackable Hub User Account Change Change Password User Name Old Password L New password Confirm Password HELP SAVE EXIT Figure 6 3 Change Password 1 Type in your user name and press Enter 2 Type in your old password and press Enter 3 Type in the new password you have chosen and press Enter Type in the same new password in the following blank to verify that you have not mistyped it 4 Choose the SAVE command to let the password change take effect 5 Choose EXIT to exit this screen Using the Console Interface 6 5 10BASE T Stackable Hubs This method can also be used by a Super User to change another us
30. ay has been included with the hub To install a transceiver using the tray first place the transceiver in the tray with the slotted stubs on the transceiver s male AUI connector fitting into the slots on the front of the tray Open the door covering the AUI port and slide the tray and transceiver into the slot until the connection is secure Most transceivers should fit within the slot To accommodate larger transceivers insert a standard AUI cable using the tray In this case the cable serves as a short extension to allow the transceiver to be used external to the hub enclosure Figure 3 2 Installing the Transceiver Tray 3 4 Setting Up the Hub 10BASE T Stackable Hubs Replacing the Power Supply The hub comes with a removable power supply for easy replacement In the unlikely event that the power supply fails or is damaged follow the steps below to replace the power supply 1 Disconnect the power cord from the AC outlet 2 Disconnect the power cord from its connector on the rear of the hub g Using a Phillips screwdriver remove the screws securing the power supply to release the unit 4 Remove the power supply by sliding it out the rear of the chassis Do not plug in the power supply when it is outside the chassis Doing so could cause personal injury or damage to the power supply pn Slide the replacement power supply into the chassis engaging the connector carefully A Attach the power cord
31. e the Admin State of the hub to Disabled 5 Move the cursor to SAVE and press Enter The Segmented indicator on the front panel should light indicating that the hub is now in a separate collision domain More information on segmenting hubs can be found in Chapter 4 Monitoring the Hub Stack The hub supports several monitoring functions allowing you to keep statistics on the operation of each port each hub and the entire network segment as well as to monitor the addresses of the packets received on each port Displaying Segment Group and Port Statistics The hub stack collects Ethernet transmission statistics for each individual port each hub in the stack and the Ethernet segment as a whole You can Using the Console Interface 6 21 10BASE T Stackable Hubs choose which to view through the Statistics menu accessible from the Network Monitoring menu MS DOS 8 VTERM Intelligent Stackable Hub Network Monitoring Statistics Menu egment Statistics Group Statistics Port Statistics Figure 6 16 Network Monitoring Menu The statistics shown are the same for each of these selections The statistics displayed are Too Long Frame counts frames longer than the 1518 byte octet limit set by the Ethernet standard This is likely caused by a software problem Very Long Event counts events where a signal is received longer than the jabber lockup protection timer 4 7 5 ms This may indicate noise on
32. easily cascaded together to further expand the network Twisted pair hub stack daisy chain cabling Allows a total distance of 100 meters between the first hub and the last hub in the daisy chain Expandable network capacity up to 8 hubs in a single stack for a maximum of 192 ports and 8 AUI ports Recessed AUI connector in the rear of the unit Accommodates most standard Ethernet transceivers Allows the transceiver to be safely and conveniently tucked away A custom tray is provided for easy insertion and removal of a recessed transceiver or cable e Clear easy to read front panel display provides comprehensive diagnostic indication of network status allowing managers to diagnose and troubleshoot instantly Introduction 1 3 10BASE T Stackable Hubs SNMP View Network Management Program available for standard SNMP based management Fully configurable either in band or out of band using any SNMP based network management system Flash EPROM for software upgradeability downloadable from TFTP Server Initiate download request from either SNMP View or an out of band console Automatic bad port partition collision detection and jabber protection Built in removable power supply replaceable without opening the enclosure Easily removed and replaced with a new one should damage occur Automatic voltage selection 100V 240V AC 50 60Hz without fuse changes or manual voltage ran
33. er s password Setting up the Master Hub This section describes the settings you will need to change to allow you to be able to manage the hub from an SNMP based Network Management System such as SNMP View or to be able to access the hub using the Telnet protocol TCP IP Settings The hub needs to have a TCP IP address assigned to it so that the network management system or Telnet client can find it on the network The TCP IP Parameters Configuration Menu allows you to change the settings for the two different interfaces used on the hub the Ethernet interface used for in band communication and the SLIP interface used over the console port for out of band communication Each of the fields on this menu takes effect the next time the system is restarted Fields that can be set include IP Address determines the IP address used by the hub for receiving SNMP and Telnet communications Should be of the form XXX XXX XXX AXX Where each xxx is a number represented in decimal between 0 and 255 This address should be a unique address on a network assigned to you by the central Internet authorities The same IP address is shared by both the SLIP and Ethernet network interfaces Subnet Mask bitmask that determines the extent of the subnet that the hub is on Should be of the form xxx xxx xxx xxx where each xxx is a number represented in decimal between O and 255 If no subnetting is being done the value should be 255 0 0 0 for a
34. eseeeseeats 1 1 Stackability and Manageability 00 ccc eeeeeeeeseeseeseeseeeeersesaeeseeeeeeeseenee 1 2 Innovative Display DECULICYe tek Rs NSO thane At At Ne Ue hue tl TS a alles Highlights eisrean o an ateven Rein cen ceeded Hae ca thea lied 1 3 General Highlights of the Intelligent Series 0 cc ees eseeseeseneeeeeseeeeseeseees 1 3 EXTERNAL FEATURES AND INDICATORS 000ssseeeeeeeeeees 2 1 Front and Back Panel Layouts ccsccescceseesseeseeseeeeceeeceeecesecnsecnseeaeens 2 1 Front Panel Indicators csccesscecesecessseceseceesceceecesncecuseceeaeecsaeeeeaeeceseeeens 2 3 SETTING UP THE HUB ssciitntinsnntuttecastetensaistiesausvainsncansinen 3 1 Power and Environmental Requirements osses 3 1 Power Connections aaan aea n a a a i iaa e inaa 3 2 Free standing Installations srsiiieenirinerinseieia eniin i 3 3 Ra k Mo nting sceana aaiae ir a a EE EEEa iS 3 3 Installing the Transceiver Tray ssesesesesesseessreersereerrerreresrsreerrsreere 3 4 Table of Contents iii 10BASE T Stackable Hubs Replacing the Power SUpply csccssccssesecsseereesseeseeeeeeseeeeecesecnsecaesnaeens 3 5 BUILDING HUB STACKS cccccssssteessteeessseeeesseeeeneneeeenees 4 1 H b ROTES psina taa a aa iaa ahibca saga Saban EN EERS 4 1 Position Within the Stack cccececseeceseeseceseeseceseeecesesseceeceaeceeeseseeeeaeeneeeaees 4 2 Master Hub Roles Slave H b ROLES eraren aeea e aen ae a Ea arae rar aE e S Ee aE E EREE PHU
35. factory reset be absolutely certain that this is what you want to do Once the reset is done all of the hub s settings stored in NVRAM including TCP IP parameters SNMP parameters the enabled disabled settings of ports security settings etc will be erased and restored to their factory default settings 1 Choose Factory Reset NVRAM to Default Value from the main menu amp MS DOS an VTERM ERE Intelligent Stackable Hub Factory Reset WARNING The factory reset also reset the hub fire you sure you want to proceed with factory reset I Yes Figure 6 20 Factory Reset 1 Move the cursor to Yes to confirm the reset and press Enter The hub should restart and all of its parameters will be reset to their default values Using the Console Interface 6 27 10BASE T Stackable Hubs SPECIFICATIONS Interface IEEE 802 3 10BASE T Twisted pair ports IEEE 802 3 10BASE5 AUI Port RS 232 port Daisy chain port Display Indicators SNMPT12_ SNMPT12i SNMPT24 pea For each TP Port Link Y Yy Y Data reception Auto Partition Y Y Manual Partition Y Daisy chain Link Y Collision Y Utilization Y Hub Unit ID Y Standby Master OO Ny y N Y Console Out of band N Y Y Feature SNMPT12i SNMPT24 _ SNMPT24i RS 232C port DB 9 DCE DB 9 DCE configuration 9600 bps 9600 bps Async no Async no parity 8 bits parity 8 bits 1 stop bit 1 stop bit Power 90 to Specifications A 1
36. from the rest of the stack the Segmented indicator on the front panel display will light For information about segmenting hubs using the console interface see Chapter 6 in this User s Guide For information about segmenting hubs using the network management module for the hub see the management module s User s Guide NOTE Hub segmentation is controlled by the master hub While the hub is performing its Power On Self Test POST all hubs in the stack will be connected together in a single segment When the master hub completes its initialization it will restore any segmentation of the hubs Therefore if you are using a switch or bridge to join different segments be sure to enable the IEEE 803 1d Spanning Tree Protocol to prevent temporary network loops Building Hub Stacks 4 7 10BASE T Stackable Hubs NETWORK CONNECTIONS Once you have set up your hubs and connected them into a stack you are ready to connect network stations and to connect your hub to the rest of your Ethernet network This chapter tells how to connect workstations to the hub and the hub to the other hubs and network components on your local area network Connecting Stations to the Hub The hub s RJ 45 connectors are used for directly connecting the hub to network devices using 10BASE T shielded or unshielded twisted pair cable STP or UTP The X label marked on each port means the ports are MDI X ports which connect to workstations and servers u
37. ge settings Slim profile usable as a standalone desktop unit or as a rack mountable unit e FCC Class A compliant CE Mark compliant e VCCI Level 1 compliant Hub IDs are automatically assigned during initialization or when daisy chain links are changed One RS 232 console port for out of band management Telnet network management is also supported The RS 232 serial communication port can be configured as either local console or remote access through Telnet based on SLIP support as well as updating to the latest firmware via TFTP 1 4 Introduction 10BASE T Stackable Hubs Redundant Backup Management To maximize management uptime two master hubs can be put in the same stack If the first one goes down the backup hub can automatically take over to provide uninterrupted traffic monitoring and network control Introduction 1 5 10BASE T Stackable Hubs EXTERNAL FEATURES AND INDICATORS This chapter introduces the controls and connectors on the front and rear panels of the hub and explains the front panel display in detail Figures 2 1 2 2 and 2 3 show the layouts of the front panel rear panel and display of the stackable hubs Note that there are variations in the appearances of the front and back panels between hubs in the series Only the 24 port models are depicted in this User s Guide Front and Back Panel Layouts LED Panel Uplink Switch 10BASE T Ports Figure 2 1 Fro
38. isy chain port consists of one set of two RJ 45 connectors It allows you to connect Intelligent hubs together into a stack of up to 8 hubs with a maximum of 192 10BASE T ports Expansion Module Port manageable models only Used for adding optional expansion modules to the hub such as the 10 100Mbps switch module Front Panel Indicators eA SS c Fa 3 e Sa et 5 w wc de aw 09 Wood Lt moe LE 1 2 e pati LI Disable Partition Utilization E Ec go Bx Ho B uu aS Bx CNE CPA CINE 5 10 20 OOO HUB ID 3 5 10 20 40 Collision a a x z Eo En Bo Bo mS Eo E Eo By Eo a3 8 aS ag avo ana aoa TNS 3c e Peas Disable Lm Partition Utilization Figure 2 3 Indicator Display External Features and Indicators 2 3 10BASE T Stackable Hubs The hub s front panel display features the following indicators Port Status Indicators Each of the ports has an LED status indicator for reporting its link and activity status and showing whether or not it has been partitioned The port status indicators always come on when the hub is powered on After the POST Power On Self Test is completed they normally go off The following describes each indicator and the meaning of each condition Link The indicator of a port lights green when the port is connected to a powered Ethernet station If the station to which the hub is connected is powe
39. itting the cable will most likely cause errors RS 232 DB9 Pin Specification The RS 232 serial port of the hub uses a 9 pin female connector The port can be connected to a VT 100 type terminal a PC or a workstation emulating a VT 100 terminal The connection can be either local or remote through a modem For a remote connection a modem cable with a 9 pin male connector on the hub side is needed The figures below show the connections necessary for local and remote connection to 9 pin and 25 pin RS 232 devices Cables and Connectors D 3 10BASE T Stackable Hubs Console Port Terminal PC Serial Port DCE DB 9 DTE DB 9 RXD TxD yO 34ND nD SBIDGESN Figure D 4 Local Connection to 9 Pin Serial Port Console Port Terminal PC Serial Port DCE DB 9 DTE DB 25 o4 43x 206 JJ g n 1 2 3 4 SG 5 6 7 8 9 Figure D 5 Local Connection to 25 Pin Serial Port Console Port Connector Modem DCE DB 9 DCE DB 9 D g n ep O CGHNSGREGNS Figure D 6 Remote Modem Connection to 9 Pin Serial Port D 4 Cables and Connectors 10BASE T Stackable Hubs Console Port Modem DCE DB 9 DCE DB 25 Bs x lt iw JJ n n 1 2 3 4 SG 5 6 7 8 9 Figure D 7 Remote Modem Connection to 25 Pin Serial Port Cables and Connectors D 5
40. le Hubs a MS DOS xt VTERM Intelligent Stackable Hub Network Monitoring Primary Backup Master Menu group ID Status I dress MAC Address P Ad Primary Master 202 39 74 28 0080C86114 7C Figure 6 13 Primary Backup Master Menu Controlling Hubs in the Hub Stack The Group Configuration Menu screen found within the Network Monitoring menu displays information about each of the hubs in the stack and allows you to make the Hub ID indicator flash The items displayed on this screen are Group ID indicates which hub group is being displayed Group Serial Number gives the serial number of the displayed hub Group Description gives a description of the given hub showing how many ports it has and what options are available such as whether or not it is a master hub Group Role shows what role the hub is currently serving in the hub stack Primary Master Backup Master or Slave Using the Console Interface 6 17 10BASE T Stackable Hubs Group Port Capacity shows the total number of controllable ports includes the UTP ports AUI ports an internal management port etc Group Hardware Revision shows the design version of the hub hardware Group Status shows whether the hub is up or down Group Last Oper Change shows at what time the hub was last added to or removed from the stack The format is hh mm ss xx with hh representing hours since the master hub was powered on mm the minu
41. le Interface 10BASE T Stackable Hubs Logging In to the Hub Console The Intelligent Series master hubs support user based security that can allow you to prevent unauthorized users from accessing the hub or changing its settings This means that before you can access the functions of the hub you will need to first log into the hub giving a password This section tells how to log onto the hub and how to change your password Logging In When you first connect to the hub it will display the login screen MS DOS 8 VTERM Intelligent Stackable Hub Local Management Version 1 0 Copyright C 1995 96 User Name i Password Figure 6 1 Login Screen To log in 1 Type in your user name and press Enter 2 Type in your password and press Enter Using the Console Interface 6 3 10BASE T Stackable Hubs 3 With the cursor on the OK selection press Enter The main menu screen will be displayed NOTE When the hub is shipped from the factory the default user name is SNMP T and the default password is also SNMP T You will need to use this user name and password when you first set up your hub or if you have completely reset the hub settings using the Factory Reset NVRAM Default Value menu selection Be sure to change this user name and password as described below to protect the security of your hub There are two levels of user privileges Super User and General User The default user SNMP T h
42. lowing trap parameters can be set IP Address gives the IP address of the network management station to receive the trap SNMP Community String determines the SNMP community name to be included in the trap request 6 12 Using the Console Interface 10BASE T Stackable Hubs Status determines whether this trap entry is valid or invalid You can delete an entry by changing its status to Invalid SNMP Security Community Names SNMP version 1 implements a rudimentary form of security by requiring that each request include a community name A community name is an arbitrary string of characters used as a password to control access to the hub If the hub receives a request with a community name it doesn t recognize it will trigger an authentication trap The SNMP allows up to four different community names to be defined and the access rights for each community can be separately set to either read only or read write The community names public and private are defined by default you can change these names in addition to adding others You will need to coordinate these names with the community name settings you use in your network management system MS DOS 8 VTERM ee a se AS ae Intelligent Stackable Hub SNHP Manager Setting Menu SNMP Community Strin Access Right Status lt Read Only gt Valid gt eee lt Read ilrite gt lt Valid gt 1 lt Read Only gt lt Invalid gt lt Read Only
43. ly below it Other hubs can be placed in any order below the master hubs Connect a daisy chain cable from the OUT port of the Active Master hub to the IN port of the next hub downstream Each additional cable should go from the OUT port of one hub to the IN port of the hub below it as shown below in Figure 4 2 4 4 Building Hub Stacks 10BASE T Stackable Hubs Inte Hublink i T A In Out a Huby In Out Huby fy N t Hubs fey Daisy chain cable standard Category 5 or higher UTP STP Figure 4 2 Daisy Chaining Hubs Segmenting Hubs The emergence of Ethernet switching hub technology has made it more common to segment local area networks into smaller pieces to reduce congestion on each segment This makes it easier to balance network loads since a smaller number of devices compete for the 10Mbps bandwidth on each network segment A stack of eight hubs makes network management convenient but 192 Ethernet stations on a single Ethernet network segment may give slow response at peak network loads Therefore the hub provides a way to segment hubs from the stack into their own collision domains Segmenting hubs requires only a simple management command and does not require any hardware or wiring changes Though the hubs continue to be daisy chained together and are managed as a single unit each hub can either be a part of the collision domain of the rest of the stack or can be separated into its own network segment
44. ment may be up to 185 meters long Each device on the thin coax segment needs to have a BNC port or use a 10BASE2 transceiver The cables should be connected to the BNC ports using BNC T connectors and there should be 50 ohm terminating resistors on each end Make sure that you leave at least 0 5 meters of coaxial cable between any two nodes on the thin coaxial cable segment Using Fiber or Thick Coaxial Cabling Similarly transceivers connected to the AUI port can be used for connecting thick coax Ethernet LOBASES5 or fiber optic cabling FOIRL or 1OBASE FL to the hub A thick Ethernet trunk can be up to 500 meters long preferably a single piece of cable and should have 50 ohm terminating resistors at each end The cable shield should be grounded at one end 10BASE5 transceivers usually tap directly into the coaxial cable taps should be placed at 2 5 meter intervals and you can have a maximum of 100 taps on a single cable segment You can connect the transceiver to the hub s AUI port using an AUI cable up to 50 meters long Using a fiber optic transceiver you can link to another hub or hub stack up 1000 meters away using FOIRL Fiber Optic Inter Repeater Link or up to 2000 meters away using 10BASE FL The fiber optic transceiver should be inserted into the AUI port Two fiber optic cables are required the transmit line of each transceiver should be connected to the receive connector of the other Network Connections 5 5 10BA
45. nage a large number of hub stacks since all of the configuration parameters for all of the hubs can be managed in a single place The configuration file is a text file usually stored on the server with a CFG extension It can be up to 10 kilobytes long Lines beginning with are considered comments which are ignored by the hub All other lines are commands which are interpreted by the master hub The configuration file commands accepted by the hub are sysdescr string Takes string as the System Name corresponding to the SNMP MIB II variable system sysName This field is used to give a name to the hub for administrative purposes The hub s fully qualified domain name is often used provided a name has been assigned The string can be up to 64 characters long syscontact string Takes string as the System Contact corresponding to the SNMP MIB II variable sysContact This field is used to give the name and Boot Configuration File C 1 10BASE T Stackable Hubs contact information for the person responsible for administering the hub The string can be up to 64 characters long syslocation string Takes string as the System Location corresponding to the SNMP MIB II variable sysLocation This field is used to indicate the physical location of the hub for administrative purposes The string can be up to 64 characters long baud raten Sets the console port transmission rate used when the port is being used in out of
46. nt Panel Layout Setting Up the Hub 2 1 10BASE T Stackable Hubs Console Port _ Expansion Module Port y Removable Power Supply AUI Connector z a Se Daisy chain Port Figure 2 2 Back Panel Layout The following components are found on the front and back panels of the hubs 2 2 Ethernet Ports Used for connecting the hub to network devices using 10BASE T shielded or unshielded twisted pair cable The X label marked on each port means the ports are MDI X ports which connect to workstations and servers using straight through cables and to other hubs using crossover cables Port 1 Uplink Switch Converts port 1 to an uplink port to allow you to connect the hub to an Ethernet switch or another hub with an ordinary straight through cable instead of a modified crossover cable RS 232 Console Port manageable models only Used to connect the master hub to a network management station for out of band communication or for simple management using the console interface The console port has a standard 9 pin RS 232 female connector External Features and Indicators 10BASE T Stackable Hubs AUI Port Used when connecting the hub to a 10BASES5 thick Ethernet backbone or to other types of Ethernet media The recessed AUI port accommodates most standard transceivers also known as Media Access Units or MAUs allowing the transceiver to be safely and conveniently tucked away Daisy chain Port The da
47. o the daisy chain in port of the hub and the up arrow indicates that another hub is connected to the daisy chain out port Col Ratio manageable models only The Col Ratio bar graph displays the collision rate on the Ethernet network in units of tens of collisions per second Collisions occur whenever two or more devices on the network attempt to transmit at the same time whenever that happens all of the devices involved back off and retransmit after a small delay An excessive number of collisions can drastically reduce the bandwidth of the network and may indicate that the network is overloaded or that there is some sort of hardware or wiring problem The Col Ratio is only displayed on the manageable hub models on all models however the Col indicator will blink when a collision occurs External Features and Indicators 10BASE T Stackable Hubs SETTING UP THE HUB This chapter explains how to choose a place for your hub stack and how to set up your hubs Power and Environmental Requirements The hubs feature an auto selecting 100 240 V 50 60 Hz power supply unit which works in most countries around the world Before connecting the supplied power cord to the hub check to see that the power cord does not exceed the maximum length allowed in the country of operation The power cord normally included with the device is 1 83m 6ft long Also make sure it is terminated with the proper connector for use with your p
48. ork Monitor SRAM Test gt 2 ee PASSED DL P2517B NIC Test O ee PASSED Expansion Module Test 2202 ee PASSED INTELLIGENT SYSTEM CONFIG AND RUN TIME IMAGE DOWNLOAD gt DUPLICATE IP CHECKING Hit CTRL C to stop system boot load IP Address 202 39 74 51 Subnet Mask 255 255 255 0 ARP Req Send ARP Reply ARP Retry Time Sec 4 0 3 3 gt DOWNLOAD RUN TIME IMAGE FROM FLASH Hit CTRL C to stop system boot load During the initial part of the test the Hub ID indicator will display a letter A As each test is done the hub lights the amber frames around the port numbers as a progress indication If any critical part of the test fails the hub Power On Self Test B 1 10BASE T Stackable Hubs will halt the Hub ID A indicator will flash and the last frame lit in the series will show what test failed The parts of the Power on Self Test and the indicator associated with each part are as follows 1 PROM Test Port 1 Frame Tests the integrity of the hub s internal Read Only Memory 2 DRAM Test Port 2 Frame Tests the hub s internal Random Access Memory 3 LED Display Test Port 3 Frame Tests to make sure the front panel display works properly Failure of this test is not considered a fatal error and failure will not cause the hub to halt 4 EEPROM Test Port 4 Frame Tests the hub s internal parameter storage memory Failure of this test is not considered a fatal error and failure will no
49. oses System Contact corresponds to the SNMP MIB II variable sysContact and is used to give the name and contact information for the person responsible for administering the hub CECE Intelligent Stackable Hub System Configuration Menu Mgmt Hardware Revision Rev 02 Boot PROM Firmware Version Yer 2 21 Software Version Ver 1 06 MAC Address 6080C861147C System Description SNMP T24 Stackable Hub SNMP Telnet Agent System Name System Location System Contact Console Telnet Display Timeout in Minutes 3 HELP SAVE EXIT Figure 6 7 System Configuration Menu Using the Console Interface 6 11 10BASE T Stackable Hubs The System Configuration Menu also contains the Console Telnet Display Timeout parameter which determines how long the console may sit idle before the user is logged out SNMP Traps The hub sends out SNMP traps to network management stations whenever certain exceptional events occur such as when the hub is powered on or when an SNMP request is made using an unknown community name The hub allows traps to be routed to up to four different network management hosts MS DOS 8 VTERM Intelligent Stackable Hub SNMP Trap Manager Setting Menu ITP Address SNMP Community String Status APERINTE private 1 lt Valid gt 202 39 74 59 1 private lt Valid gt lt lt Invalid gt L it 1 lt Invalid gt SAVE EXIT Figure 6 8 SNMP Trap Manager Menu The fol
50. ot used Workstation MDI Hub MDI X Figure D 2 Straight through Cable Crossover Cable When cascading or connecting the hub to another switch bridge or hub through the UTP port a modified crossover cable is necessary With a crossover cable two pairs of wires are switched at one connector end Carry out the following steps to create a customized crossover twisted pair cable 1 Leave one end of the cable as is with the RJ 45 connector intact The wiring at just one end of the cable needs to be modified 2 At the other end of the cable connect wires 1 and 2 to contacts 3 and 6 respectively Likewise connect wires 3 and 6 to contacts 1 and 2 Refer to the following diagram Hub MDI X Hub MDI X Figure D 3 Crossover Cable D 2 Cables and Connectors 10BASE T Stackable Hubs Daisy chain Cable The hubs use ordinary Category 5 twisted pair cable with RJ 45 connectors on each end for stacking All four pairs of the eight wire cable are used A 30cm daisy chain cable is included with the hub this information is included in case you want to make your own longer cable Daisy chain cables may be of any length provided the distance between the first hub and the last hub in the stack is 100 meters or less Contact Daisy Chain Daisy Chain IN OUT 1 Link OUT 2 Link IN 3 Data 4 Management 5 Management Management 6 Data 7 ID 8 ID NOTE Pins 1 2 3 6 4 5 and 7 8 must be pairs spl
51. ou need to expand your network beyond an eight port stack or you need to connect your hub to other parts of your network you can cascade it using several different network media including 1 OBASE T twisted pair cabling 10BASE2 thin coaxial cabling 10BASES5 thick coaxial cabling and FOIRL or LOBASE FL fiber optic cabling When planning your network it is important to keep the Ethernet configuration rules in mind In particular be sure that there are no more than four repeaters including hubs or hub stacks between any two stations on the network Also be careful that none of the cable links exceed the maximum length for that type of cable If you need to exceed the repeater limit you can use a bridge or Ethernet Switch to divide the network into separate collision domains Using Twisted pair Cabling One way you can connect hubs or 12hub stacks together is by using ordinary twisted pair cabling This is the simplest method though it has the disadvantages that the distance between hub stacks can be at most 100 meters and all but the first and last hubs require two RJ 45 ports each for the cascade connections Twisted pair cabling is also usually used to connect repeater hubs to Ethernet switching hubs There are two different ways of cascading hubs using 1OBASE T cabling The first way is to use a crossover cable which connects the transmit of one hub to the receive of the other and vice versa A crossover cable can be made easily
52. p to 8 hubs can be daisy chained together using UTP or STP cable with 7 client hubs sharing the master hub s SNMP management agent to provide a connectivity solution for departmental Ethernet networks ranging up to 192 twisted pair nodes Bandwidth can be substantially increased using micro segmentation and LAN switching technologies Innovative Display Intelligent Series hubs are equipped with a large clear display that shows an extensive array of information at a glance including link receive and partitioning status bandwidth utilization collision ratio runt occurrences and data transmission errors Security The Intelligent Series supports intrusion control Intrusion Control prevents unauthorized individuals from accessing the network Through the network management software Ethernet addresses that represent authorized users can be assigned to each hub port If a packet is received from a port that contains a source address from other than the authorized user the port is disabled and a notification is sent to the network manager 1 2 Introduction 10BASE T Stackable Hubs Highlights General Highlights of the Intelligent Series Complies with the IEEE 802 3 1OBASE T 10BASE2 1OBASES and 1OBASE FL standards Twelve or twenty four independent RJ 45 ports for Category 3 4 5 twisted pair wiring either UTP or STP to nodes in a 1OBASE T compliant network e Switchable uplink port allows stacks of hubs to be
53. re the hub and a manageable stack using the console program Product Specifications Provides information on the physical and electrical specifications of the hubs Power On Self Test Provides information about the POST messages used for troubleshooting problems with the hub Boot Configuration File Describes the hub boot configuration file Cables and Connectors Describes the specifications of the cables and connectors used with the hubs vii 10BASE T Stackable Hubs INTRODUCTION The Intelligent Stackable Managed Hub Series lets you build a 10Mbps Ethernet hub stack with full SNMP manageability convenient setup and an unprecedented degree of flexibility The Series allows you to turn your network into the ideal connectivity solution by maximizing network performance Overview Important features of the Intelligent Series include Media Connection Flexibility The Intelligent Series hubs support multiple Ethernet media types with twelve or twenty four ports for twisted pair cabling and one AUI port which provides connectivity for a variety of Ethernet wiring environments from basic workgroups to remote branch offices An appropriate external transceiver allows the AUI port to be used to connect to any type of Ethernet medium Introduction 1 1 10BASE T Stackable Hubs Stackability and Manageability A stack of Intelligent hubs can be separated up to 100 meters apart and still keep their manageability U
54. red off or if there is a problem with the link the indicator is off Receive The indicator of a port blinks green when the port is currently receiving packets on the connected segment Upon reception each data packet will be transmitted through all other connected ports on the hub or in the hub stack Auto partition The indicator of a port blinks amber when the port is automatically partitioned due to an abnormal network condition A port is temporarily partitioned when too many line errors or too many collisions are detected on the port While the segment is automatically partitioned the port continues to receive data However data is not transmitted out of the segment from the port When the problem is corrected or a valid data packet is received from the port the port is automatically reconnected External Features and Indicators 10BASE T Stackable Hubs Manual Partition The indicator of a port lights amber continually when the port is manually partitioned Manually partitioning a port has the same effect as automatic partitioning except that you must also manually re enable it You can choose to manually partition a port even if there is nothing wrong with it for example to prevent a certain device from accessing the network or to reduce network traffic No incoming packet transmission can occur on a manually partitioned port Ports can be partitioned and re enabled using an SNMP based network managemen
55. ror o 2 Illegal configuration file name gt 3 Runtime image download error D Can t perform out of band download when console mode is specified Erase Flash Memory Port 4 Frame Port 10 Frame If a new image file was downloaded the hub needs to erase the flash memory in preparation for storing the image Error codes in this step include gt 1 Can t Erase Flash Memory Write Flash Memory Port 5 Frame Port 11 Frame If a new image file was downloaded the hub needs to write the new image into the hub s flash memory Error codes in this step include gt 1 Flash Memory Programming Error Download Image from Flash Port 6 Frame Port 12 Frame The hub reads the runtime image from its flash memory and stores it in Power On Self Test 10BASE T Stackable Hubs ordinary memory in preparation for use This is the last step in the boot process Error codes in this step include gt 1 Local Flash Download Error Flash Memory Checksum Error gt 2 Local Flash Download Error Run Time Image Error Power On Self Test B 5 10BASE T Stackable Hubs C BoOoT CONFIGURATION FILE The master hubs in the series support a powerful configuration file which allows many of the hub stack s configuration parameters to be stored on a centralized server When the master hub starts up it can be configured to read its configuration file from the server using the TFTP protocol This can make it easier to ma
56. sing straight through cables and to other hubs using crossover cables To connect to a network station use ordinary Ethernet twisted pair cable Category 3 or better either directly or through a central wiring patch block The cable can be a maximum of 100 meters long Only two wire pairs in the cable are used for IOBASE T Ethernet One wire pair should be connected to pins 1 and 2 of the connector and another wire pair should be connected to pins 3 and 6 Detailed pinout information for 1 OBASE T connectors can be found in Appendix D Network Connections 5 1 10BASE T Stackable Hubs Plug the RJ 45 connector at one end into the network station and the other end into a free 1OBASE T port on the front of the hub When both the hub and the device at the other end of the connection are turned on and the cable is connected at both ends then the Link indication for the port should light If it does not then 1 Be sure that the connectors are seated correctly at both ends of the cable 2 Check the continuity of the wires in the cable as well as the pin assignments on the RJ 45 connectors 3 Be sure that the network station to which the port is connected is plugged in and powered on 4 Check that the right type of cable is connected to the port and that the uplink switch is set correctly Figure 5 1 Connecting Stations to the Hubs 5 2 Network Connections 10BASE T Stackable Hubs Cascading Hub Stacks If y
57. station connected to the port and Down otherwise Link Test State toggle control used for controlling whether or not the port requires link pulses If this field is set to Enable the port will check for link pulses and will only transmit if there is a good link to another station If the field is set to disabled Link Test will always display Up the link indicator will always be lit and the hub will always transmit data to the port whether a station is connected or not Receive Polarity displays Normal if the polarity of the port s receive lines is normal and Reversed if the two receive lines have been swapped Polarity Reversal this toggle determines whether or not the hub will do automatic polarity reversal on the port If enabled the hub will automatically reverse the polarity of reversed signals If disabled the hub will repeat signals received over that port with reversed polarity Using the Console Interface 6 19 10BASE T Stackable Hubs Auto Partition displays On if the port has been automatically partitioned off from the rest of the network due to excessive errors and Off if the port is operating normally Admin State this toggle determines whether the port should be enabled or disabled manually partitioned Setting the Admin State to Disabled will isolate the port from the rest of the network MS DOS PEI VTERM Intelligent Stackable Hub Network Monitoring Port State Menu Group ID 1 8
58. t cause the hub to halt Hub parameters may be lost however 5 Flash Memory Test Port 5 Frame Tests the hub s flash memory used for storing the hub s run time image 6 Network Monitor SRAM Port 6 Frame Tests the memory used in the hub for collecting network statistics 7 DL P2517B NIC Test Port 7 Frame Tests the hub s internal network interface controller used for in band SNMP and Telnet communication over the Ethernet network 8 Expansion Module Test Port 8 Frame Tests the expansion module attached to the rear of the hub if there is one Failure of this test is not considered a fatal error and failure will not cause the hub to halt If any of the self test items fail contact your technical service representative for assistance B 2 Power On Self Test 10BASE T Stackable Hubs When the power on self test is completed the hub begins its boot sequence If you are using out of band software downloading the hub waits for 5 seconds to give you an opportunity to stop the boot process by pressing Control C and blinks the Port 3 and Port 4 frames before beginning the download As the hub boots it blinks display indicators to show its current progress The steps in the boot sequence are listed below If any of these steps fail the Hub ID indicator will blink showing an error code and the particular step s indicators will continue to blink to show at what place in the boot process the failure occurred Yo
59. t system or using the console menu interface Master manageable models only The Master indicator lights to indicate that the master hub is serving as an active master Console manageable models only The master hub s Console or Out Of Band indicator will light to indicate whether the hub s RS 232 console port is being used for the console interface or for out of band network management using the SLIP protocol The mode of the console port may be set using the console interface or using an SNMP based network management system FCS Align manageable models only The FCS Frame Check Sequence Align indicator lights amber to indicate that data packets have been corrupted during transmission An FCS error occurs when a data packet fails an internal consistency check An alignment error occurs when the bits in a packet don t add up to a whole number of bytes External Features and Indicators 2 5 10BASE T Stackable Hubs Late Col manageable models only The Late Col indicator lights when a collision is detected that happened after the 512th bit of a frame Late collisions may be caused by overly long delays in the Ethernet network either due to cable that is too long or a repeater hub count that is too high Runt manageable models only The Runt indicator lights when the hub receives a packet that is too short Ethernet packets must be at least 64 bytes long Runts are often a normal side effect of collisions
60. tes The hub is capable of obtaining its boot time configuration information as well as updated versions of its internal firmware using TFTP the Trivial File Transfer Protocol and BOOTP the BOOTstrap Protocol You can use the Software Update menu to control this feature The fields you can set in this menu are Software Update Determines whether or not the hub will try to look for a configuration file over the network If set to Disable none of the fields below have any effect Software Update Mode Set to either Network or Out of band Determines whether the configuration file should be obtained through the Ethernet network or through the console port Boot Protocol Set to either TFTP ONLY or BOOTP amp TFTP Applies only if the S W Update Control is enabled Using the Console Interface 6 9 10BASE T Stackable Hubs Boot Server IP Address The IP address of the TFTP server where the configuration file is located This entry is used only if the S W Update Control is enabled and your boot protocol is tftp only if you are using bootp tftp mode or if Send BOOTP Request on Power Up is enabled the address will be obtained from the BOOTP server Boot File Name The pathname of the configuration file on your TFTP server If you are using SNMP View as your TFTP server this is the pathname of the CFG file on your hard disk This entry is used only if your boot protocol is TFTP ONLY if you are using BOOTP amp TFTP mode or if
61. tes ss the seconds and xx representing 100ths of a second Group ID LED Flash Control a toggle allowing you to turn Group ID flashing on or off You can turn on Group ID flashing for a particular hub in order to help you find that hub within a large bank of hubs Intelligent Stackable Hub Network Monitoring Group Configuration Menu Group ID 1 8 il Group Serial Number E G012FC Group Description SNMP T24i Group Role Primary Master Group Port Capacity 28 Group Hardware Revision Rev 3 Group Status p Group Last Oper Change 0 0 2 92 Group ID LED Flash Control lt Disable gt PREY GROUP NEXT GROUP HELP SAVE EXIT Figure 6 14 Group Configuration Menu 6 18 Using the Console Interface 10BASE T Stackable Hubs You can use the PREV GROUP and NEXT GROUP commands to switch to another hub or you can enter the hub s Group ID number directly into the Group ID field Controlling Individual Ports The Port State Menu accessible from the Network Monitoring menu allows you to view the status of individual ports and to control their settings The available settings are Group ID determines which hub s ports are displayed Port ID determines which port is displayed Ports 13 16 on the 12 port hubs and ports 25 28 on the 24 port hubs represent the daisy chain ports the external AUI connector the internal expansion port and the management port respectively Link Test displays Up if there is a
62. u should hit Control C to enter the console menu and change any parameters as needed otherwise the hub will wait ten seconds and restart 1 Get BOOTP Information Port 1 Frame Port 7 Frame The hub sends a BOOTP request to obtain its IP address network mask default IP gateway and boot configuration file name This step will be skipped if the hub is not configured to use the BOOTP protocol Error codes in this step include o 1 Can t get BOOTP information from BOOTP Server BOOTP Timeout gt C Can t get boot information from out of band interface Out of band download can t use BOOTP protocol gt E Unknown boot load protocol pd Duplicate IP Check Port 2 Frame Port 8 Frame The hub sends ARP Address Resolution Protocol requests to the network looking for other hosts with the same IP address as the one configured for it No two hosts may have the same IP address The IP address and subnet mask will also be checked to make sure they are valid Error codes in this step include gt 1 Power On Self Test B 3 10BASE T Stackable Hubs a B 4 Duplicate IP address detected E Invalid IP address or subnet mask TFTP Download Port 3 Frame Port 9 Frame The hub uses the TFTP protocol to load its boot configuration file and optionally the run time image This step is omitted if the hub is configured to not use TFTP Error codes in this step include 1 System configuration file download er

D-Link DE 1824Ei (DE-1824EI) Networking Hub

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