Instruction/ maintenance manual of the product ELS10-26TX Cabletron Systems
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Smar tSTAC K 10 ELS10-26 USER GUIDE ELS10-26TX STATUS PORT STA TUS MODE 10BASE-T/ 100BASE-TX FEPIM 2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27 LINK STA TUS LINK STA TUS 26 27 LINK STA TUS .
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i NOTICE Cabletron Systems reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Cabletron Systems to determine whether any such changes ha ve been made.
Notice ii DOC NOTICE This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications.
Notice iii CABLETRON SOFTWARE PROGRAM LICENSE 1. LICENSE . You have the right to use only the one (1) copy of the Program provided in this package subject to the terms and conditions of this License Agreement.
Notice iv DECLARATION OF CONFORMITY Application of Council Directiv e(s): 89/336/EEC 73/23/EEC Manufacturer’ s Name: Cabletron Systems, Inc. Manufacturer’ s Address: 35 Industrial Way PO Box 5005 Rochester, NH 03867 European Representativ e Name: Mr.
v CONTENTS CHAPTER 1 INTRODUCTION 1.1 ABOUT THIS MANUAL ........................................................................ 1-1 1.2 GETTING HELP ....................................................................................... 1-2 1.4 RELATED DOCUMENTATION .
vi Contents 3.10 DISPLAYING MONITORING STATUS ........................................... 3-12 3.11 DEFINING AND DELETING WORKGROUPS ..............................3-14 3.12 ASSIGNING A COMMUNITY NAME .............................................3-16 3.
Contents vii CHAPTER 5 ELS10-26 DIAGNOSTICS AND TROUBLESHOOTING 5.1 POWER-UP DIAGNOSTICS .................................................................. 5-1 5.1.1 Power-up LED Sequence .............................................................. 5-1 5.
viii Contents.
1-1 CHAPTER 1 INTRODUCTION 1.1 ABOUT THIS MANUAL This manual is for system administrators responsible for configuring, monitoring, and maintaining the SmartST ACK 10 ELS10-26TX. Y ou should have a familiarity with networking concepts and principles. In addition, a basic understanding of SNMP is helpful.
1-2 Introduction • Chapter 5, ELS10-26 Diagnostics and Troubleshooting , describes the SmartST ACK 10 ELS10-26 diagnostics and provides information on tr oubleshooting common problems. • Appendix A, Technical Specifications , provides the SmartST ACK 10 ELS10-26 specifications and basic cabling pin assignments.
Introduction 1-3 Before calling Cabletr on Systems Global Call Center , have the following information ready: • Y our Cabletr on Systems contract number • A description of the failure • A description of any action(s) already taken to r esolve the problem (e.
1-4 Introduction and an IP addr ess to execute the ipaddr <port #> <IP address> command: ELS10-26 > ipaddr 6 192.138.217.40 Field value options appear in bold typeface.
Introduction 1-5 1.5 OVERVIEW The SmartST ACK 10 ELS10-26TX is an intelligent Ethernet-to- Ethernet switch that is configured with 25 IEEE 802.3 10BASE-T Full Duplex Ethernet ports, one fixed 100BAS.
1-6 Introduction • Operates in either Half Duplex or Full Duplex modes on all ports. • Implements the Spanning T ree pr otocol (802.1d). • Configured with factory-set defaults for immediate plug-and- play capability (IP addr ess is not configured at factory).
Introduction 1-7 new devices to the network, change device addresses, and r emove devices from the network without having to r econfigure the SmartST ACK 10 ELS10-26.
1-8 Introduction network and when it is granted permission to transmit. In addition, full store and forwar d switching ensures data integrity , thus preventing network err or conditions from being generated throughout the network.
Introduction 1-9 By forwarding only packets addr essed to devices on other network segments, the SmartST ACK 10 ELS10-26 reduces unnecessary traffic and ther eby enhances the overall performance of the network. Note: If the packet address is not found in the Bridge Address Table, it will be forwarded (flooded) to all network segments.
1-10 Introduction If a packet’s address is not alr eady stored in the Bridge Address T able, the SmartST ACK 10 ELS10-26 adds the learned address, associated segment number , and a timer value indicating the age of the observation.
Introduction 1-11 1.5.3 SmartST A CK 10 ELS10-26 P or t Monitoring Port monitoring allows the SmartST ACK 10 ELS10-26 to redir ect network traffic (including MAC layer err ors) from one port to the port monitoring port (MONX port), in effect “mirr oring” all network traffic to this port.
1-12 Introduction SmartST A CK 10 ELS10-26 T runking The SmartST ACK 10 ELS10-26 allows two trunk groups with up to eight ports each to be connected between the SmartST ACK 10 ELS10-26 and other devices in the FastNetwork and SmartST ACK families.
Introduction 1-13 Figure 1-5 illustrates how the SmartST ACK 10 ELS10-26 can be used in a backbone network configuration. Figure 1-5. Smar tST A CK 10 ELS10-26 Backbone Configuration SmartST A CK 10 ELS10-26 Fast Ethernet The SmartST ACK 10 ELS10-26 has two additional ports that provide fast Ethernet connections of 100 Mbps.
1-14 Introduction Figure 1-6 illustrates connecting two SmartST ACK 10 ELS10-26 Fast Ethernet ports to increase the bandwidth to 200 Mbps. Figure 1-6. Smar tST A CK 10 ELS10-26 T runking with 100 Mbps.
Introduction 1-15 Figure 1-7 illustrates how the SmartST ACK 10 ELS10-26 can be used in a backbone network configuration using increased bandwidth of the Fast Ethernet configuration.
1-16 Introduction Figure 1-8 shows two Ethernet segments, A and B, that do not include a SmartST ACK 10 ELS10-26. Figure 1-8. Multiple Ethernet Segments Sharing 10 Mbps Bandwidth Each host on segments A and B is limited to sharing a network bandwidth of 10 Mbps.
Introduction 1-17 Figure 1-9 shows two Ethernet segments that take advantage of the virtual workgroup featur e of the SmartST ACK 10 ELS10-26 and the increased bandwidth applied to each A and B host.
1-18 Introduction As illustrated in the previous diagram, virtual workgr oups allow you to associate multiple ports and define a workgroup. In r eality , you are assigning workgr oup IDs to SmartST ACK 10 ELS10-26 ports. 1.6 LOCAL CONSOLE MANAGER The Local Console Manager (LCM) is a command-line interface built into the SmartST ACK 10 ELS10-26.
Introduction 1-19 1.6.1 Command Syntax Con ventions The following conventions apply as you use LCM commands: • Press the Enter key to execute a command after you type it in. •A port range is either a single port number , or a list of port numbers separated by commas or hyphens.
1-20 Introduction 1.6.2 Basic LCM Commands If you are going to manage the SmartST ACK 10 ELS10-26 using LCM, you first must connect the SmartST ACK 10 ELS10-26 to an ASCII terminal or terminal emulator . See Section 2.5, Connecting the Local Console Manager , for instructions.
Introduction 1-21 ELS10-26 > help ELS10-26 Local Console Manager help or ? this menu status [PORT-RANGE] to display unit or port status baud [BAUD-RATE] to change the console baud rate exit or logo.
1-22 Introduction Erase Entering erase to erase the current SmartST ACK 10 ELS10-26 configuration returns all parameters to the default values. Exit or Logout Logs you out of LCM. (The exit command is functionally equivalent to the logout command.) T raplog Displays the traps messages captured by the SmartST ACK 10 ELS10-26.
2-1 CHAPTER 2 UNPACKING AND INSTALLING Y OUR ELS10-26 Carefully unpack the ELS10-26 fr om the shipping carton and inspect it for possible damage. If any damage is evident, contact your supplier .
2-2 Unpacking and Installing Y our ELS10-26 Figure 2-1. ELS10-26 Front Panel ELS10-26TX STATUS PORT STATUS MODE 10BASE-T/ 100BASE-TX FEPIM 2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X 27 LINK .
Unpacking and Installing Y our ELS10-26 2-3 T able 2-1. Meaning of ELS10-26 LEDs LED Meaning Port Status Mode TX RX ACT COL FDX 100 MON USR On – Indicates port is transmitting a packet. On – Indicates port is receiving a packet. On – Indicates port is transmitting or receiving.
2-4 Unpacking and Installing Y our ELS10-26 T able 2-2 describes the ELS10-26 buttons. 2.2 INSTALLING AN FEPIM The ELS10-26 provides a slot for a Cabletr on FEPIM (Fast Ethernet Port Interface Module). The ELS10-26 is shipped without an FEPIM. T o install an FEPIM, follow the pr ocedure below: 1.
Unpacking and Installing Y our ELS10-26 2-5 Figure 2-2. Installing an FEPIM 1742-39 FE-100TX 10 100 16 15 Standoff Standoffs Module Motherboard Connector Module Connector Faceplate.
2-6 Unpacking and Installing Y our ELS10-26 2.3 INSTALLING THE ELS10-26 Rack-mounting an ELS10-26 T able 2-3 describes some general considerations you should be aware of befor e mounting a ELS10-26 in a rack assembly .
Unpacking and Installing Y our ELS10-26 2-7 The ELS10-26 can be rack-mounted in a standard 19-inch equipment cabinet. T o mount the ELS10-26 in a rack assembly , apply the following steps: 1. Attach the rackmount brackets to either side of the ELS10-26 chassis, as shown in Figure 2-3.
2-8 Unpacking and Installing Y our ELS10-26 4. Once the ELS10-26 is installed, plug the AC power cord into the AC power connector on the rear of the ELS10-26 chassis.
Unpacking and Installing Y our ELS10-26 2-9 2.5 CONNECTING THE LOCAL CONSOLE MANAGER The Local Console Manager (LCM) is a command-line interface for configuring, monitoring, and managing the ELS10-26 through the out-of-band RS232C connection on the front panel.
2-10 Unpacking and Installing Y our ELS10-26 Refer to Section 2.6.3 to make a fiber optic connection to an FE-100FX. 2.6.1 Connecting UTP Cables Before connecting a segment to the ELS10-26, check each end of the segment to verify wire cr ossover . Connect a twisted pair segment to the ELS10-26 as follows: 1.
Unpacking and Installing Y our ELS10-26 2-11 a. Check that the 10BASE-T device at the other end of the twisted pair segment is ON and connected to the segment. b. Verify that the RJ45 connectors on the twisted pair segment have the proper pinouts (Figure 2-7) and check the cable for continuity.
2-12 Unpacking and Installing Y our ELS10-26 determine if the wires have been cr ossed over for the proper connection. A schematic of a crossover cable is shown in Figur e 2-6. If the wires do not cross over , use the switch on the FE-100TX to internally cross over the RJ45 port.
Unpacking and Installing Y our ELS10-26 2-13 d. Make sure that the twisted pair connection meets dB loss and cable specifications. e. Confirm that the crossover switch is in the correct position.
2-14 Unpacking and Installing Y our ELS10-26 2. Insert one end of the SC connector into the FE-100FX installed in the ELS10-26. See Figure 2-8. 3. At the other end of the fiber optic cable, attach the SC connector to the other device. Figure 2-8. FE-100FX Port 4.
Unpacking and Installing Y our ELS10-26 2-15 b. Verify proper crossing over of fiber strands between the applicable port on the ELS10-26 and the fiber optic device at the other end of the fiber optic link segment. c. Verify that the fiber connection meets the dB loss specifications.
2-16 Unpacking and Installing Y our ELS10-26.
3-1 CHAPTER 3 CONFIGURING Y OUR ELS10-26 The ELS10-26 does not requir e any additional configuration to operate as a standard, transpar ent switch. However , if you want to use any of the ELS10-26’.
3-2 Configuring Y our ELS10-26 The following sections describe how to configure the optional parameters of the ELS10-26 using LCM commands, including: • Assigning IP addr esses • Enabling and di.
Configuring Y our ELS10-26 3-3 • Class B addresses ar e used for medium sized networks. The first two bytes identify the network and the last two identify the node. The first byte of a class B address must be in the range 128- 191. The address 128.
3-4 Configuring Y our ELS10-26 3.1.1 Displaying IP Ad dresses T o display IP addresses, subnet masks, and MAC addr esses of all ports on the ELS10-26 you are configuring, at the LCM pr ompt: 1. T ype ipaddr LCM displays the current IP address table, for example: 3.
Configuring Y our ELS10-26 3-5 T o change the subnet mask, at the LCM pr ompt: 1. T ype ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK> For example, ipaddr 6 192.138.217.40 255.255.240.0 would set the subnet mask for port 6 to 255.255.
3-6 Configuring Y our ELS10-26 Using LCM to enable bridging for a port or port range, at the LCM prompt: 1. T ype bridge [PORT-RANGE [{off|on|noBPDU}]] For example, bridge 2 on would enable bridging on port 2. LCM responds: 3.3 DISABLING BRIDGING T o turn of f the bridging function for a port or port range, at the LCM prompt: 1.
Configuring Y our ELS10-26 3-7 Y ou could also type bridge [PORT-RANGE] to look at a specific range of ports. For example bridge 2-4 would display bridging functions for ports 2, 3, and 4.
3-8 Configuring Y our ELS10-26 Figure 3-1. T runk Connections T runk Gr oups Each set of connections between two ELS10-26s is called a T runk Group . Y ou can create two T runk Groups, each having up to eight ports, to interconnect your ELS10-26s.
Configuring Y our ELS10-26 3-9 Figure 3-2. T runk Groups T o enable trunking for the example shown, perform the following: 1. Connect the desired ports of the ELS10-26s together using 10BASE-T crossover cables. If ELS10-26 A is handling only a small number of users, the A to B T runk Gr oup could have just two ports per ELS10-26.
3-10 Configuring Y our ELS10-26 For ELS10-26 B, at the LCM prompt: b. Type trunk 3-10,14-15 on For ELS10-26 C, at the LCM prompt: c. Type trunk 3-10 on Each ELS10-26 determines which ports are part of which T runk Group. After T runk Gr oup configuration, the ELS10-26s complete the standard 802.
Configuring Y our ELS10-26 3-11 3.7 DISPLAYING T RUNKING STATUS T o check the status of your curr ent trunking configuration, at the LCM prompt: 1. T ype trunk <PORT-RANGE> The display could look like the following: Note: IP Addresses are not required for trunking to function.
3-12 Configuring Y our ELS10-26 The display could look like the following: The following conditions can be displayed: • Broken — T runking is enabled, but the port in non-operational. • Closed (or Oneway) — T runking is enabled, and the T runking Protocol is attempting to establish a tr unk connection.
Configuring Y our ELS10-26 3-13 • Perturbed — T runking is enabled, and a good trunk connection has been established. However , the forwarding of data packets is temporarily suspended to allow for a change in the membership of the T runk Gr oup. 3.
3-14 Configuring Y our ELS10-26 3.9 DISABLING MONITORING T o turn of f monitoring, at the LCM prompt: 1. T ype Mirror <PORT> off For example, mirror 2 off 3.10 DISPLAYING MONITORING STATUS T o check the status of your curr ent monitoring configuration, at the LCM prompt: 1.
Configuring Y our ELS10-26 3-15 The display could look like the following: The following conditions can be displayed: • Rx only — Monitoring is enabled, but monitoring only packets received by the port. • Tx only — Monitoring is enabled, but monitoring only packets transmitted by the port.
3-16 Configuring Y our ELS10-26 3.11 DEFINING AND DELETING W ORKGROUPS The ELS10-26 allows you to define logical groups of associated ports (virtual workgroups) to pr ovide a more efficient flow of traffic acr oss your Ethernet network. V irtual workgroups of fer you the ability to limit broadcasts to logical domains within the network.
Configuring Y our ELS10-26 3-17 The LCM commands used to create the pr evious configuration are as follows: 1. T o create workgr oup A on ports 3, 4, 5, 13, and 16: ESL10-26 > workgroup A 3-5,13,16 LCM responds with the following display: Name: a Ports: 3, 4, 5, 13, 16 Info: all 2.
3-18 Configuring Y our ELS10-26 T o display information about a specific workgr oup, at the LCM prompt: 1. T ype workgroup NAME T o cr eate or modify a workgroup, at the LCM pr ompt: 1. T ype workgroup NAME PORT-RANGE INFO T o delete a workgr oup, at the LCM prompt: 1.
Configuring Y our ELS10-26 3-19 5. LCM prompts you to verify the new community name by retyping it. 6. Retype the new community name. 3.13 CONFIGURING BROADCAST/MULTICAST STORM PROTECTION The ELS10-26 provides automatic pr otection against broadcast/multicast storms.
3-20 Configuring Y our ELS10-26 • lxifTxStormCnt – specif ies the maximum number of multicasts that can be broadcast within the given time. • lxiTxStormTime – specif ies the period of time that the maximum number of multicasts can be broadcasted.
Configuring Y our ELS10-26 3-21 3.16 SYSTEM NAME The system name is a name assigned to the ELS10-26 by the network administrator . By convention, the system name is the fully qualified domain name. (This name then becomes the LCM prompt.) sysName - {system 5} DisplayString (SIZE (0.
3-22 Configuring Y our ELS10-26 Set Community Name The set community name variable ( lxadminAnyPass ) and get community name variable ( lxadminGetPass ) must be set to the value of the community name used by the SNMP manager for performing either set or get operations.
4-1 CHAPTER 4 MONITORING AND MANAGING Y OUR ELS10-26 Monitoring the ELS10-26 consists of collecting and analyzing statistics and system status information. Y ou can use the Select button on the fr ont panel of the ELS10-26 to monitor segment status on any of the Ethernet ports.
4-2 Monitoring and Managing Y our ELS10-26 ELS10-26 statistics are divided into four gr oups: • System statistics • Ethernet port statistics • T raffic analysis statistics • SNMP statistics Y ou can use this information to analyze your overall network performance and to make configuration changes as necessary .
Monitoring and Managing Y our ELS10-26 4-3 • The time since a topology change was last initiated. • The physical location of the ELS10-26. • The name and address of the contact person for the ELS10-26. • The name of the ELS10-26. • The current number of dynamic (learned) addr esses.
4-4 Monitoring and Managing Y our ELS10-26 4.3 USING LCM TO CHECK ELS10-26 STATUS The LCM commands that enable you to quickly check on the status of the ELS10-26 include: • Status • Address display • Ipaddr • Ident These LCM commands are described in the sections that follow .
Monitoring and Managing Y our ELS10-26 4-5 If you do not want to view the status of each Ethernet port, use the Ctrl-C keys to return to the LCM pr ompt. Software Currently Running: version xx.xx.xx software, Tue 08/23/94 15:0 3 Next Bootstrap (1st bank): version xx.
4-6 Monitoring and Managing Y our ELS10-26 If you do not want to view the status of port 2, use the Ctrl-C keys to return to the LCM pr ompt. Y ou can view the status for multiple of ports by typing status and indicating the range of port numbers, for example status 2-6 .
Monitoring and Managing Y our ELS10-26 4-7 T o display all MAC addr esses, at the LCM prompt: 1. T ype addresses display any LCM responds with a list of all MAC addr esses, their associated ports, the type, age, and number of frames from and to that address.
4-8 Monitoring and Managing Y our ELS10-26 LCM would display: The ipaddr command displays the IP addresses, subnet masks, and MAC addresses of all ELS10-26 ports. At the LCM prompt: 1. T ype ipaddr LCM displays the current IP address table, for example.
Monitoring and Managing Y our ELS10-26 4-9 4.4 MANAGING THE ELS10-26 Managing the ELS10-26 consists of: • Disabling and enabling Ethernet ports • Changing a subnet mask • Changing a community na.
4-10 Monitoring and Managing Y our ELS10-26 4.5.1 Disabling a P ort There can be times when you need to disable a specific Ethernet port, for example, after you have determined that there is faulty equipment. Disabling a port effectively stops all bridging functions for that port.
Monitoring and Managing Y our ELS10-26 4-11 For example, enable 7-9 would enable ports 7, 8, and 9. LCM responds: noRIP Option The Routing Information Protocol (RIP) is one of the pr otocols that allows the ELS10-26 to build an accurate, current r outing table.
4-12 Monitoring and Managing Y our ELS10-26 LCM displays the current IP address table, for example: T o change the subnet mask, at the LCM pr ompt: 1. T ype ipaddr <PORT-NUMBER> <IP ADDRESS> <SUBNET MASK> For example, ipaddr 6 192.138.
Monitoring and Managing Y our ELS10-26 4-13 3. Enter the new community name. LCM prompts you to verify the new community name by retyping it. 4. Retype the new community name. 4.5.5 Setting the Baud Rate Y ou can set the baud rate for your LCM console connection.
4-14 Monitoring and Managing Y our ELS10-26 T o change the baud rate setting, at the LCM pr ompt: 1. T ype baud <baud rate> For example, baud 9600 would set the baud rate to 9600. LCM responds: 4.5.6 Setting a Reboot Time Y ou can enter the number of seconds the ELS10-26 waits befor e rebooting.
5-1 CHAPTER 5 ELS10-26 DIAGNOSTICS AND T R OUBLESHOOTING The ELS10-26 incorporates built-in diagnostic and testing capabilities which are convenient to use and cause minimal or no disruption to the r est of the operational network. These capabilities are ef fective for isolating problems within the ELS10-26 unit.
5-2 ELS10-26 Diagnostics and T roubleshooting 5. After several more seconds, the CPU LED will stay on, indicating that the power-up diagnostics sequence is complete. In addition, the Port Link LEDs will turn on for those ports with good links and the Segment Status LEDs will turn on (or flash) when the selected status condition is present.
ELS10-26 Diagnostics and T roubleshooting 5-3 The operational parameters of the ELS10-26 software ar e also protected by a checksum comparison. When the ELS10-26 r eboots, if the operational parameter.
5-4 ELS10-26 Diagnostics and T roubleshooting Figure 5-1. ELS10-26 Front Panel LEDs ELS10-26TX STATUS PORT STA TUS MODE 10BASE-T/ 100BASE-TX FEPIM 2X 4X 6X 8X 10X 12X 14X 16X 18X 20X 22X 24X MONX 26X .
ELS10-26 Diagnostics and T roubleshooting 5-5 T able 5-2 describes the ELS10-26 buttons. T able 5-1. Meaning of ELS10-26 LEDs LED Meaning Port Status Mode TX RX ACT COL FDX 100 MON USR On – Indicates port is transmitting a packet. On – Indicates port is receiving a packet.
5-6 ELS10-26 Diagnostics and T roubleshooting 5.4 T ROUB LESHOOTING This section lists several situations that could happen while using the ELS10-26, and suggests appropriate action. Because every situation is potentially unique, the corrective actions suggested here should be consider ed as guidelines only .
ELS10-26 Diagnostics and T roubleshooting 5-7 5.5.2 ELS10-26 Has Rebooted • Use the LCM ident command to check the ELS10-26 diagnostic codes, and call your authorized Cabletron Systems repr esentative. 5.5.3 ELS10-26 Does Not Respond to NMS • Check the port status using LCM.
5-8 ELS10-26 Diagnostics and T roubleshooting.
A-1 APPENDIX A T ECHNICAL SPECIFICATIONS A.1 ELS10-26 SPECIFICATIONS Physical Height 1.75 in (4.45 cm) W idth 17 in (43.18 cm) Depth 15.75 in (40 cm) W eight 9 lb (4.
A-2 T echnical Specifications En vironmental Operating temperature 5 ° to 40 ° C (41 ° to 104 ° F) Storage temperature -30 ° to 73 ° C (-22 ° to 164 ° F) Operating relative humidity 5% to 90%.
T echnical Specifications A-3 • T ransparent Bridging with Spanning T ree • Ethernet V ersion 2 • EIA RS232C (DTE-to-DCE Interface Specification) • EIA RS-310-C (Rack-mount Specification) Address T able Size 979 dynamic entries Management Support • MIB II, 802.
A-4 T echnical Specifications T able A-2. DB9 Pin Assignments A.3 10B ASE-T PIN ASSIGNMENTS An Ethernet twisted-pair link segment requir es two pairs of wires. Each wire pair is identified by solid and striped color ed wires. For example, one wire in the pair might be r ed and the other wire, red with white stripes.
T echnical Specifications A-5 Each twisted-pair link segment must ha ve a male connector attached to both ends. According to the 10B ASE-T specification, pins 1 and 2 on the connector are used for recei ving data; pins 3 and 6 are used for transmitting data, as sho wn in T able A-3.
A-6 T echnical Specifications A.5 CROSSO VER WIRING T wo ELS10-26s can communicate only if the transmitter on one unit is connected to the receiver on the other unit. This r eversal, or crossover function, can be implemented either in the wiring or in the device itself.
T echnical Specifications A-7 A.7 FEPIM SPECIFICATIONS The ELS10-26 uses a Fast Ethernet Interface Module (FEPIM) to provide fr ont panel cable connections. FEPIMs are user-installable. See Section 2.2, Installing an FEPIM . FE-100TX The FE-100TX is an RJ45 connector supporting Unshielded T wisted Pair (UTP) cabling.
A-8 T echnical Specifications Figure A-3. FE-100FX The transmitter power levels and receive sensitivity levels listed are Peak Power Levels after optical overshoot. A Peak Power Meter must be used to correctly compar e the values given above to those measured on any particular port.
B-1 APPENDIX B GLOSSARY address A set of characters that uniquely identifies a station, peripheral device, node, or other unit in a network. address table A database of device addresses and their associated ports maintained by a switch or bridge for use in making data packet forwarding and filtering decisions.
B-2 Glossar y backbone The major , central transmission path for a network. A backbone usually handles high-volume, high-density traffic. T ypically a backbone connects various LANs into an integrated network.
Glossar y B-3 congestion A condition where a portion of the network is overloaded with more data than can be transmitted in the desir ed time period. CSMA/CD (carrier-sense multiple access with collision detection) A channel access (contention) method that requir es each station to wait for an idle channel before transmitting.
B-4 Glossar y encapsulation A method for moving messages across networks that use dif ferent types of protocols. The message is encapsulated (rather than translated), so it can move across a network that otherwise could not understand its protocol. Encapsulating bridges and switches generally use proprietary encapsulation schemes.
Glossar y B-5 ICMP (Internet control message protocol) An auxiliary protocol of IP used to convey advice and error messages about events in the IP layer . IEEE (Institute of Electrical and Electronic Engineers) International professional society which issues networking and other standards.
B-6 Glossar y internetworking The linking of one or more networks to facilitate communication across networks. interoperability The ability of equipment from multiple vendors to exchange information using standardized pr otocols. IP (Internet protocol) IP is the basic datagram pr otocol used at the network layer of the TCP/IP stack.
Glossar y B-7 MAC (media access control) The data link layer sublayer responsible for scheduling, transmitting, and receiving data on a shar ed medium local area network. mask Specified a subset of a larger set of data to be included for comparison and analysis.
B-8 Glossar y OSI (Open Systems Interconnection) Refers to the OSI refer ence model, a logical structure for network operations. OSI is the internationally accepted framework of standards for internetwork communication.
Glossar y B-9 protocol A set of rules used by computers and r elated devices to communicate with each other . protocol suite A group of pr otocols related to a common framework. RARP (reverse address resolution protocol) A protocol that binds MAC addr esses to specific IP addresses.
B-10 Glossar y switch An intelligent, protocol independent device used to connect similar or dissimilar LANs. symbol The smallest signaling element used by the MAC sublayer . Each symbol corresponds to a specific sequence of code bits to be transmitted by the physical layer .
Glossar y B-11 upstream Refers to the relative position of a station in a network to another station in the same network. A station is upstream from its neighbor if it receives data befor e its neighbor receives the data. W AN (wide area network) A communication network that spans a large geographic ar ea.
B-12 Glossar y.
I-1 INDEX Numerics 10BASE-T connection 2-10 10BASE-T pin assignments A-4 5 - 4 - 3 rule A-6 802.1D Spanning Tree 3-10 A adding IP addresses 3-3 address table dynamic entry 1-10 size A-3 addresses addi.
Inde x I-2 disabling bridging functions 3-6 ports 4-10 trunking 3-10, 3-14 displaying baud rate 4-13 bridge functions 3-6 FastNET 10 status 4-4 IP addresses 3-4, 4-8, 4-11 MAC addresses 4-7 manufactur.
Inde x I-3 multicast storm protection defined 3-19 MIB variables 3-19 N Network connection FE-100FX 2-13 FX-100TX 2-11 non-volatile memory 5-3 noRIP option 4-11 O or 1-22 OSI Reference Model 1-7 P pin.
Inde x I-4 W wiring crossover A-6 straight-through A-5.
An important point after buying a device Cabletron Systems ELS10-26TX (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cabletron Systems ELS10-26TX yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cabletron Systems ELS10-26TX - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cabletron Systems ELS10-26TX you will learn all the available features of the product, as well as information on its operation. The information that you get Cabletron Systems ELS10-26TX will certainly help you make a decision on the purchase.
If you already are a holder of Cabletron Systems ELS10-26TX, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cabletron Systems ELS10-26TX.
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