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Related Manuals for 3Com 3C780 - LinkBuilder FDDI Base Unit
Summary of Contents for 3Com 3C780 - LinkBuilder FDDI Base Unit
- Page 1 LinkBuilder FDDI Workgroup Hub ® User Guide A member of the LinkBuilder FDDI family For 3Com User Group Information 1-800-NET-3Com or your local 3Com office Manual Part No. 09-0447-000 Published July 1993. Printed in the U.S.A.
- Page 2 California, USA 95052-8145 © 3Com Corporation, 1993. All rights reserved. No part of this manual may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.
- Page 3 LIMITED WARRANTY HARDWARE: 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Bridge, gateway, and other internetworking products...
- Page 4 OF BUSINESS, OR OTHER FINANCIAL LOSS ARISING OUT OF OR IN CONNECTION WITH THE SALE, INSTALLATION, MAINTENANCE, USE, PERFORMANCE, FAILURE, OR INTERRUPTION OF ITS PRODUCTS, EVEN IF 3COM OR ITS AUTHORIZED RESELLER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
- Page 5 This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402. Stock No. 004-000-00345-4. NOTE: In order to maintain compliance with the limits of a Class B digital device, 3Com requires that you use quality interface cables when connecting to this device. Changes or modifications not expressly approved by 3Com could void the user’s authority to operate this equipment.
- Page 6 We hereby certify that the 3C781, 3C782, 3C783 comply with the RFI Suppression Requirements of Vfg 1046/1984. The German Postal Service was notified that the equipment is being marketed. The German Postal Service has the right to re-test the equipment and to verify that it complies. 3Com Corporation 5400 Bayfront Plaza Santa Clara, California, U.S.A.
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Page 7: Table Of Contents
Contents Quick Start Road Map to Hub Operations 1 Unpacking the Hub 2 Unpacking the Modules 3 Installing the Modules 4 Connecting to the Ring 6 Chapter 1 Overview FDDI Technology 1-2 Physical Medium Dependent (PMD) Protocol 1-4 Fiber-Optic 1-4 Shielded Twisted Pair (STP) 1-4 Unshielded Twisted Pair (UTP) 1-5 Physical (PHY) Protocol 1-5... - Page 8 Chapter 2 Installing the Hub Unpacking the Hub 2-1 Mounting the Hub in a Rack 2-2 Equipping the Hub 2-5 Basic Contents 2-5 Hub Chassis 2-6 Media Port Modules 2-6 Installing the Battery 2-7 Keys for Fiber Port Modules 2-9 STP Cascade Connector 2-11 Installing Modules 2-12 Removing Modules 2-14...
- Page 9 Port Connections 3-11 Configuring Modules 3-15 Using the STP Cascade Connector 3-18 Chapter 4 Setting Up the Hub Commands 4-1 Command Descriptions 4-2 Display of Command Results 4-2 Setting Addresses 4-3 IP Address 4-3 Netmask 4-4 Broadcast Address 4-4 Default Gateway Address 4-4 Setting the Password 4-5 Setting Attachment Port Configurations 4-6 Using Station Management Parameters 4-7...
- Page 10 Chapter 5 Using the Hub Getting Hub Information 5-1 Show Hub Configuration 5-1 Show MAC Frame Statistics 5-1 Show IP Addresses 5-3 Show MIB Counters 5-3 Show Neighbor Stations 5-4 Show Station Identification 5-4 Show Ports Information 5-5 Module Designation 5-6 PMD Class 5-6 PHY Type 5-7 Neighbor 5-7...
- Page 11 Appendix A System Messages Error Messages A-1 Download Messages A-4 Fault Log Error Code Messages A-6 Appendix B Technical Specifications Appendix C Commands Management Console Commands C-1 Set Commands C-1 set attach C-1 set baud C-2 set boot C-3 set gateway C-4 set help C-4 set ip C-4 set ler C-5...
- Page 12 show sid C-14 show tmax C-14 show tneg C-15 show tnotify C-15 show treq C-15 show tvx C-15 Diagnostic and Connectivity Commands C-16 arp C-16 clear C-16 connect C-17 disconnect C-17 help C-17 logout C-17 ping C-18 reset C-18 route C-18 Primitive Console Commands C-19 Set Commands C-20 set attach C-20...
- Page 13 On-line Product Support D-1 CardBoard Bulletin Board Service D-1 Automated Fax Service D-2 Ask3Com On-line Service D-2 3Com Documentation on CD-ROM D-3 Support from Your Network Supplier D-3 U.S. and Canada D-3 Outside the U.S. and Canada D-3 Returning Products for Repair D-5...
- Page 14 Figures 1-1. Ring Wrap 1-3 1-2. The LinkBuilder FDDI Workgroup Hub 1-8 1-3. Physical Topology for Typical FDDI Ring 1-9 1-4. FDDI Ring of Trees 1-10 1-5. Management Module, Front Panel 1-11 1-6. Fiber Media Port Module, Front Panel 1-13 1-7.
- Page 15 3-1. Dual Attachment Hub (DAC) 3-2 3-2. Dual Attachment Hubs (DACs) in Wrap State 3-3 3-3. Single Attachment Hub (SAC) 3-4 3-4. Null Attachment Hub (NAC) and Connected Stations (SAS and DAS) 3-5 3-5. Dual Homing Connections 3-6 3-6. Upstream and Downstream Neighbors 3-13 3-7.
- Page 16 Tables 2-1. DB-9 STP Connector Pin Assignments 2-21 2-2. RJ-45 UTP Connector Pin Assignments 2-22 2-3. FDDI Port Types 2-23 3-1. LinkBuilder FDDI Workgroup Hub Default Configuration 3-7 3-2. Selecting Port Configurations for Attachment Types 3-12 3-3. Port Connection Rules 3-14 3-4.
- Page 17 Chapters 6 through 12 constitute a 250-page technical reference that takes you down to the engineering level. Here 3Com interprets the FDDI standards to provide tangible and accessible information on all four FDDI protocol = SIGNAL DETECT...
- Page 18 WAN Technologies for Internetworking (3CS-370) Order through your authorized 3Com reseller or local 3Com office. Availability in self-study format may vary outside the U.S. To order directly from 3Com Education Services, call 1-800-876-3266, press option 7, then option 3. Callers outside the U.S.
- Page 19 Chapter Title ® wants to hear from you! To ensure the very best 3Com service and support, take advantage of our One-Year ® Warranty on 3Com‘s LinkBuilder FDDI Workgroup Hub. Please fill out and return the enclosed registration card to start your one-year...
- Page 20 3Com France, Marketing Department ZA de Courtaboeuf 25, Ave de la Baltique B.P. 609 91945 Les Ulis Cedex France Italy 3Com Mediterraneo Srl, Marketing Department Via Michelangelo Buonarroti 1 20093 Cologno Monzese (MI) Milano Italia United Kingdom, Eire 3Com UK Ltd., Marketing Department...
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Page 21: Quick Start
You have an FDDI segment running with other network devices attached to it. Road Map to Hub Operations ® The steps listed below summarize the procedures needed to make the 3Com ® LinkBuilder FDDI Workgroup Hub operational. The list also shows where each step is discussed in this user guide. -
Page 22: Unpacking The Hub
Quick Start Configuring attachment ports – Chapter 3: “Configuring Modules” Setting up the hub for network operations – Chapter 4: “Setting Addresses”; “Using Station Management Parameters”; “Downloading New Images” Monitoring hub operations – Chapter 5: “Getting Hub Information”; “Interpreting the LEDs”; “Using Miscellaneous Commands”... -
Page 23: Unpacking The Modules
Quick Start The LinkBuilder FDDI System Software diskette, version 1.0, contains a readme file and a backup image for the flash EPROM. A 3-volt lithium battery is shipped with the management module. The battery is in a small bag inside the management module shipping container. If you ordered an STP media port module, one cascade connector will be shipped with the module. -
Page 24: Installing The Modules
Quick Start Keep all packing and shipping materials. If a module must be returned, ship it in its original shipping container (or one providing equivalent protection), or the warranty will be voided. One at a time, remove each module from its antistatic bag. Check the modules for any visible signs of damage. - Page 25 Quick Start To install the modules, follow these steps: Remove all jewelry from your hands and wrists. If necessary, remove blanking plates from the module slots. Keep the removed blanking plates in a safe place for possible future use. Remove the module from its antistatic bag. Prepare a clean, level work area nearby on which to place the module.
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Page 26: Connecting To The Ring
Quick Start Connecting to the Ring After installing the modules and plugging in the power cord, you are ready to connect the hub to the ring by attaching the appropriate cables to the attachment ports, which are the two leftmost ports on the module installed in slot 1. To complete the connection to the ring, you must configure the attachment ports. -
Page 27: Chapter 1 Overview
Overview Chapter 1 Overview ® ® The 3Com LinkBuilder FDDI Workgroup Hub brings Fiber Distributed Data Interface (FDDI) high-speed LAN technology to the desktop. (Throughout this guide, the LinkBuilder FDDI Workgroup Hub will be referred to as “the hub.”) The hub supports remote management via Station Management (SMT) 7.3 or Telnet protocol. -
Page 28: Fddi Technology
FDDI technology and experienced in installing hubs. The next section contains a brief summary of FDDI technology; it is intended as an overview only. (For detailed information about FDDI architecture and its functionality, 3Com recommends that you secure the FDDI self-paced study course, Understanding FDDI, 3CS-360, available through 3Com Education Services.) - Page 29 Overview Break in ring or station failure Ring wrap Ring wrap Primary ring Secondary ring Figure 1-1. Ring Wrap The FDDI standard developed by the American National Standards Institute (ANSI) defines four protocols: Physical Medium Dependent (PMD) Physical (PHY) Media Access Control (MAC) Station Management (SMT) Each of these protocols is briefly defined below.
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Page 30: Physical Medium Dependent (Pmd) Protocol
Overview Physical Medium Dependent (PMD) Protocol The Physical Medium Dependent protocol provides all of the services necessary to exchange data across the cable medium. PMD also specifies an optional optical bypass facility that enhances reliability. This bypass capability is invoked when an FDDI station is powered off. (For information on the optical bypass switch, see Chapter 2, “Installing the Hub.”) The PMD services included for each type of media supported by the LinkBuilder FDDI Workgroup Hub are listed below. -
Page 31: Unshielded Twisted Pair (Utp)
Overview Unshielded Twisted Pair (UTP) The ANSI TP-PMD standard provides these services for UTP: Cable requirements for category 5 UTP as defined by EIA/TIA-568 Electrical requirements for UTP transceivers FDDI-UTP cable connector Physical (PHY) Protocol The Physical protocol is responsible for encoding and decoding of data and control information on the FDDI network. -
Page 32: Station Management (Smt) Protocol
Overview NOTE: In contrast to the PMD protocol, the PHY and MAC protocols are media-independent; that is, the same protocols function regardless of the medium being used (fiber, STP, or UTP). Station Management (SMT) Protocol The Station Management protocol is involved in network management and monitoring for all layers of the FDDI stack. - Page 33 Overview The hub provides the following features: Media flexibility. You can use any mix of one, two, or three of these port modules in the hub: – FDDI media port module supporting 62.5/125 µm fiber-optic cable per the ANSI FDDI standard –...
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Page 34: Site Selection
Overview Figure 1-2 shows the LinkBuilder FDDI hub with the management module and all three types of media modules installed. = SIGNAL DETECT UTP PORT MODULE = PORT STATE = LINK ERROR ® = SIGNAL DETECT STP PORT MODULE = PORT STATE = LINK ERROR ®... -
Page 35: Typical Fddi Ring Setups
Two dual attachment hubs (DAC) are connected to the trunk ring. Two single attachment stations (SAS) are connected to each of the hubs. NOTE: 3Com uses the standard acronym DAC (for dual attachment concentrator) shown above but calls the concentrator a hub rather than a concentrator. -
Page 36: Fddi Ring Of Trees
1-10 Overview The most common “FDDI to the desktop” configuration is the ring of trees topology, shown in Figure 1-4. This figure illustrates the connecting of stations using a hub to form a tree-like structure that branches off the main trunk ring. Figure 1-4. -
Page 37: Management And Media Modules
Overview 1-11 Management and Media Modules The hub chassis provides slots for one management module (required) and three media modules, which can be mixed or matched. This section briefly describes each of these modules. (For information about the operation of the management and media modules, see Chapter 5, “Using the Hub.”) Management Module The LinkBuilder FDDI Management Module, hereafter called the “management... -
Page 38: Media Modules
1-12 Overview By interpreting the LEDs on the management module, you can: Monitor network activity Determine chassis environmental factors Discover ring attachment configuration Refer to “Interpreting the LEDs” in Chapter 5 for detailed information about the LEDs on all hub modules. Media Modules Three media modules are currently available. -
Page 39: Fiber Media Port Module, Front Panel
Overview 1-13 = SIGNAL DETECT FIBER PORT MODULE = PORT STATE = LINK ERROR ® Figure 1-6. Fiber Media Port Module, Front Panel If you insert the module in slots 2 or 3, all ports are automatically configured as M ports. With three fiber modules installed in the hub, 12 fiber MIC ports are available. -
Page 40: Stp Media Port Module
1-14 Overview STP Media Port Module Figure 1-8 shows the front panel of the six-port STP media port module. All of its ports are configured as M ports by default. You can specify any port configuration for the attachment ports, but you must use a special connector called the STP cascade connector to configure the leftmost attachment port as S. -
Page 41: Chapter 2 Installing The Hub
Installing the Hub Chapter 2 Installing the Hub This chapter describes installation of the LinkBuilder FDDI Workgroup Hub. It includes the following topics: Unpacking the hub Rack mounting the hub Equipping the hub Installing and removing modules Accessing the hub Understanding data flow Installing an optional optical bypass switch NOTE: For a step-by-step procedure for installing the hub and preparing it for... -
Page 42: Mounting The Hub In A Rack
Installing the Hub Mounting the Hub in a Rack Mounting the hub in a rack involves installing mounting brackets onto the hub and mounting the hub in the rack. To mount the hub in a 19-inch distribution rack, follow these instructions: Lift the hub from its packing container and place it on a table or other flat surface. -
Page 43: Attaching Mounting Brackets To The Hub
Installing the Hub While holding the hub in place, insert the four mounting screws supplied with the hub into the mounting holes in each bracket (two screws per bracket). Fasten the brackets to the rails by screwing in the screws. Tighten each screw. -
Page 44: Linkbuilder Fddi Workgroup Hub Installed In A Distribution Rack
Installing the Hub OD UL RT M UT P PO OD UL RT M ST P PO UL E M OD PO RT FI BE R DET ECT NA L = SIG RT STA GR N GR N = PO K ERR = LIN ®... -
Page 45: Equipping The Hub
Installing the Hub Equipping the Hub This section discusses the following hub equipment: Hub chassis Management module Lithium battery Media port modules Fiber port keys (optional) Cascade connector (optional) Basic Contents The basic package includes the following items: LinkBuilder FDDI Workgroup Hub (base unit) LinkBuilder FDDI Workgroup Hub User Guide LinkBuilder FDDI System Software diskette, version 1.0 Standard ac power cord... -
Page 46: Hub Chassis
For information about the cascade connector, refer to the section “STP Cascade Connector” later in this chapter. NOTE: Remember to fill out the Product Registration Card at the back of this manual and return it to 3Com, or call 1-800-NET-3Com for immediate registration. Hub Chassis The LinkBuilder FDDI hub is shipped with no modules installed;... -
Page 47: Installing The Battery
Installing the Hub Installing the Battery A lithium battery, which powers the nonvolatile memory bank, is supplied with the management module. The hub’s nonvolatile memory preserves the following: Boot parameters Last download status Set command parameters Fault log entries The lithium battery is a 3-volt, 550 mA-hr battery in a 2450 blister pack. It can last up to 10 years before it must be replaced. -
Page 48: Battery Location On The Management Module
Installing the Hub You must insert the battery on the management module before installing the module in the hub. To install the battery in the management module, follow these steps: Remove the battery from its container. Each management module is shipped with its battery in a small bag inside the shipping container. -
Page 49: Keys For Fiber Port Modules
Installing the Hub Carefully slide the battery into its circular holder. Ensure that the “+” sign on the battery faces up and makes contact with the positive clip that holds the battery in place. The management module is now ready to be installed in slot 0. Follow the instructions given in the section “Installing Modules”... -
Page 50: Inserting A Type M Key Into A Fiber Transceiver
2-10 Installing the Hub Use of media module keys is optional. They can be used to ensure that the correct cable is inserted into each fiber transceiver. Once a key is in place, you can only insert the cable connector specified by that key into the transceiver. -
Page 51: Stp Cascade Connector
Installing the Hub 2-11 Push the back of the key down until it snaps into place. The key sits flush with the top of the transceiver. If you decide to change the configuration of a fiber module attachment port, you must change the key in the transceiver receptacle. -
Page 52: Installing Modules
Installing the Hub One cascade connector is supplied with each STP media port module. You can purchase additional cascade connectors by contacting your 3Com sales representative. Figure 2-6 shows a cascade connector attached to the first port of an STP module installed in slot 1. - Page 53 Installing the Hub 2-13 To install the management module and the media modules for the first time, follow these steps: Remove all jewelry from your hands and wrists. If you are installing modules in slots 2 or 3, remove the blanking plates from those slots.
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Page 54: Removing Modules
2-14 Installing the Hub There is no power switch on the hub. Power to the hub is provided by connecting the power cord to the hub and to an ac outlet. NOTE: The hub allows “power-on insertion,” which means that you do not have to unplug the power cord for module insertion or removal. - Page 55 Installing the Hub 2-15 Turn the thumb screws on each end of the module counterclockwise to loosen them. Holding a thumb screw in each hand, slowly pull the module from its slot. Place the module on a clean surface, or replace the module in its original antistatic bag.
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Page 56: Accessing The Hub
2-16 Installing the Hub Accessing the Hub To monitor hub activity and (optionally) configure the hub to suit your particular network environment, you must set up an interface with the hub. You can access the hub in several ways: Connect a terminal such as a VT100 or similar dumb terminal to the RS-232 serial port on the management module, using a null-modem connector to the terminal. -
Page 57: Management Module Front Panel
Installing the Hub 2-17 To change the hub’s baud rate to match the baud rate of a terminal or modem, follow these steps: Enter the set baud command. Type: set baud This selection prompt appears: Select one of the following: 1. -
Page 58: Installing An Optional Modem
2-18 Installing the Hub Installing an Optional Modem If you want to access the hub via a Hayes modem, you must prepare the modem correctly for use with the hub. Follow these steps: If necessary, change the hub’s baud rate to match the modem’s baud rate. -
Page 59: Using Telnet To Access The Hub
Installing the Hub 2-19 Using Telnet to Access the Hub To use the Telnet protocol to access the hub, the hub must be connected to the network and must be running. You must also have the Telnet protocol running on some device on your network. Follow these steps: Enter the telnet command followed by the hub’s IP address. -
Page 60: Fddi Cabling Rules
2-20 Installing the Hub FDDI Cabling Rules The type of cabling you use depends on the media modules that you ordered. When installing the hub and the modules, observe these FDDI cabling rules: Fiber-Optic Cable All cabling media must conform to the American National Standard FDDI Physical Layer Medium Dependent (PMD) Standard, ISO 166-1990, American National Standards Institute. -
Page 61: Unshielded Twisted-Pair Cable
Installing the Hub 2-21 Table 2-1. DB-9 STP Connector Pin Assignments Pin No. Function Transmit (+) Not used Not used Not used Receive (+) Transmit (–) Not used Not used Receive (–) Unshielded Twisted-Pair Cable The standard UTP cabling type supported by the LinkBuilder FDDI Workgroup Hub is category 5 screened UTP cross-over cable with screened RJ-45 connectors, as specified by ANSI X3T9.5. -
Page 62: Utp Cabling Distances Per Ansi Standards
2-22 Installing the Hub Table 2-2. RJ-45 UTP Connector Pin Assignments Pin No. Function Transmit (+) Transmit (–) Not used Not used Not used Not used Receive (+) Receive (–) NOTE: To minimize RF emissions, the connector shell must be connected to hub ground. -
Page 63: Data Flow Specifications
Installing the Hub 2-23 Data Flow Specifications The FDDI standard specifies that data travels on the primary ring in a counterclockwise direction, and that data traveling on the secondary ring rotates clockwise. (Refer to Figure 3-1.) As you attach the hub to the ring and network devices to the hub, be aware of the data flow direction. -
Page 64: Connecting To The Dual Ring
2-24 Installing the Hub Figure 2-9. Direction of Data Flow Through a Hub and Stations The acronyms used in Figure 2-9 are defined below and described in Chapter 3: Dual attachment station Dual attachment concentrator (hub) Single attachment station Connecting to the Dual Ring To attach the hub to an FDDI dual ring, follow these steps: Install a fiber module in slot 1 on the hub. - Page 65 Installing the Hub 2-25 The default configuration of the attachment ports (the two leftmost ports on the module installed in slot 1) is B/A. If the attachment ports have been configured differently (as shown by the ATTACH LEDs on the management module), you must reconfigure them, as detailed below: Configure the attachment ports as B and A.
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Page 66: Installing An Optical Bypass Switch
If you want the protection provided by an optical bypass switch, purchase an optical bypass switch with the plug configuration shown in Figure 2-10. 3Com does not supply this device. -
Page 67: Optical Bypass Switch
Installing the Hub 2-27 To detect the presence of an optical bypass switch on your system, enter the show obs command. To install an optical bypass switch with the configuration shown in Figure 2-11, follow these steps: Plug the A and B Media Interface Connectors (MIC connectors) from a network device or another hub into the B and A receptacles on the optical bypass switch. -
Page 68: Rack Mounting A Hub With An Attached Optical Bypass Switch
2-28 Installing the Hub Plug the optical bypass switch’s power connector (a 6-pin mini-DIN plug) into the optical bypass interface receptacle on the management module. If you are installing the hub in a rack, you can purchase a cable tray to support the optical bypass switch unit, as shown in Figure 2-12, or you can rest the unit on one of the rack-mounted components. -
Page 69: Chapter 3 Configuring The Hub
Single attachment concentrator (SAC) Null attachment concentrator (NAC) Dual homing (DH) NOTE: 3Com uses the standard acronyms shown above but calls the concentrator a hub. Each type of configuration is discussed in this section. (Refer to the section “Configuring Modules” later in this chapter for information about using the set... -
Page 70: Dual Attachment Hub
Configuring the Hub Dual Attachment Hub A dual attachment hub (DAC) attaches to both the primary and the secondary rings. Figure 3-1 shows a hub functioning as a dual attachment hub. Primary ring (trunk ring) Secondary ring Legend Primary ring Secondary ring Figure 3-1. -
Page 71: Dual Attachment Hubs (Dacs) In Wrap State
Configuring the Hub You can place a dual attachment hub directly on the trunk ring. This allows it to participate in ring wrapping if a segment of the trunk fails. Figure 3-2 shows dual attachment hubs in wrap state. Fault occurred in dual attached station Figure 3-2. -
Page 72: Single Attachment Hub
Configuring the Hub Single Attachment Hub A single attachment hub (SAC) is never attached directly to the dual trunk ring. Instead, it is attached to another hub, which is connected to the main ring. Figure 3-3 shows a single attachment hub connected to the network via a dual attachment hub. -
Page 73: Null Attachment Hub
Configuring the Hub Null Attachment Hub A null attachment hub (NAC) functions as a self-contained FDDI network. It is an FDDI backbone but is not connected to a dual ring backbone. The network is concentrated in the hub, and all of the attached devices communicate through it using FDDI. -
Page 74: Dual Homing
Configuring the Hub Dual Homing Dual homing (DH) configuration provides two attachments to the FDDI network. One of them functions as a backup link if the primary link fails. This type of attachment is especially useful for connecting to mission-critical devices. -
Page 75: Default Configuration
Configuring the Hub Default Configuration Table 3-1 shows the hub’s factory default configuration on start-up. Table 3-1. LinkBuilder FDDI Workgroup Hub Default Configuration Description Factory-Set Default T-Notify 30 seconds 2.6214 milliseconds* T-Req 165 milliseconds LER cutoff 10.E-07 LER alarm 10.E-08 Attachment IP address 0.0.0.0... -
Page 76: Accessing Configuration Commands
Configuring the Hub You can operate the hub using its default configuration without making any changes whatsoever. However, you may want to change various parameters to suit your particular network environment. Refer to Chapters 4 and 5 and Appendix C for information about making changes to the hub’s default configuration. -
Page 77: Primitive Console Commands
Configuring the Hub Primitive Console Commands The “primitive” console commands, which are a subset of the management console commands, are accessible in case of unusual system situations. For example, you can access the primitive console command mode if: You forget the password. (You do not need a password to access the primitive console command mode. - Page 78 3-10 Configuring the Hub If you do not press the RESET button during the 10 seconds that the STATUS LED is flashing amber/green, you are denied access to the primitive console command mode, and this message appears: Primitive console entry has timed out. Press RESET again.
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Page 79: Returning To The Management Console Command Mode
Press [Enter]. This message appears: ® 3Com LinkBuilder FDDI Workgroup Hub The password prompt appears. Enter the password and press [Enter]. To return to the management console command mode from the primitive console command mode, reset the hub. -
Page 80: Selecting Port Configurations For Attachment Types
3-12 Configuring the Hub Table 3-2. Selecting Port Configurations for Attachment Types Attachment Type Attachment Ports Configuration Dual attachment B/A* Dual homing attachment B/A* Single attachment Null attachment *The B/A configuration supports both dual attachment and dual homing. The B and A ports are used to dual attach the hub to the trunk ring or dual home to other hubs. -
Page 81: Upstream And Downstream Neighbors
Configuring the Hub 3-13 The concept of neighbor is shown in Figure 3-6. Upstream Downstream neighbor neighbor from B from B Direction of data flow: A to B to C Figure 3-6. Upstream and Downstream Neighbors To display the addresses of the hub’s upstream and downstream neighbors, enter the show neigh command. -
Page 82: Port Connection Rules
3-14 Configuring the Hub Table 3-3. Port Connection Rules Attachment Neighbor Ports Ports V, U, T V, P, W V, U, W V, U, T V, P, W V, U, W V, W V, W V, U, W V, U, W Table 3-4. -
Page 83: Configuring Modules
Configuring the Hub 3-15 Table 3-4. Definitions for the Port Connection Rules (continued) Condition Port Connection Definition of Port Indicator Condition Condition Wrap state Exists when a break in the primary ring occurs and the stations on either side of the break join the primary and secondary rings. -
Page 84: Configuring Modules
3-16 Configuring the Hub All three types of port modules can be installed in slot 1. The type of module you install depends on the medium you are using to connect the hub to the next node. Table 3-5 shows how to configure each module for the type of attachment desired and what additional equipment or action is necessary to complete the connection. - Page 85 Configuring the Hub 3-17 Table 3-5. Configuring Modules (continued) Attachment Additional Attachment Port Equipment Module Type Configuration Required Dual Cross-over cable Dual homing Cross-over cable Single Cross-over cable Null Cross-over cable To change the configuration of the attachment ports, follow these steps: Enter the set attach command.
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Page 86: Using The Stp Cascade Connector
3-18 Configuring the Hub Using the STP Cascade Connector By default, all ports on an STP media module are physically configured as M ports. If you want to configure the module for a B/A or S/M connection, you must use one or two STP cascade connectors to allow the new configuration. (The STP cascade connector gets its name from its use in connecting a series of rack-mounted hubs in which the connecting cascade cables “flow”... - Page 87 Configuring the Hub 3-19 To use an STP module in a dual attachment configuration, for example, follow these steps: If the attachment ports are not currently configured as B/A, configure the attachment ports to be B/A by invoking the set attach command. Reset the hub.
- Page 88 Setting Up the Hub Chapter 4 Setting Up the Hub The LinkBuilder FDDI Workgroup Hub is shipped ready to plug in and use without the need to change any parameters. In all probability, however, you will want to make a number of changes to adapt the hub to your network environment.
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Page 89: Chapter 4 Setting Up The Hub Commands
Setting Up the Hub Command Descriptions For a complete listing and detailed description of all the commands, refer to Appendix C, “Commands.” For a list of the set commands with brief definitions, type: set ? set help For a list of the show commands with brief definitions, type: show ? show help To display a list of the miscellaneous commands with brief definitions,... -
Page 90: Setting Addresses
Setting Up the Hub Setting Addresses The hub management module uses the TCP/IP network environment for downloading images and managing the hub. Refer to the section “Downloading New Images” later in this chapter for a discussion of downloading procedures. The console command set provides for setting and displaying TCP/IP-related addresses. -
Page 91: Netmask
Setting Up the Hub NOTE: In this manual, the address format used (three digits in each octet) is assumed to be decimal representation. If you prefer hexadecimal representation, the address format would be 0x12.0x34.0x56.0x78. The “0x” indicates that the subsequent digits represent hexadecimal values. Netmask The netmask, also known as the subnet mask, is used when multiple physical networks share the same IP address. -
Page 92: Setting The Password
Setting Up the Hub Setting the Password Access to the hub is password-protected. To display the password prompt when the hub is first powered up, press any key. The modem init string (AT&F) appears briefly. You are then prompted for the password. The hub is shipped with no password installed. -
Page 93: Setting Attachment Port Configurations
Setting Up the Hub Setting Attachment Port Configurations To configure the attachment ports, use the set attach command. Type the command: set attach This selection prompt appears: Select one of the following: 1. B/A 2. S/M 3. M/M Attachment port configuration? Enter the configuration you want. -
Page 94: Using Station Management Parameters
Setting Up the Hub Using Station Management Parameters The hub supports a number of station management (SMT) parameters to help you understand and manage the processes occurring in the FDDI ring. You can set and display three of these parameters. You can display three other parameters, but you cannot set them. -
Page 95: Target Token Rotation Time (T-Req)
Setting Up the Hub Target Token Rotation Time (T-Req) The FDDI ring is initialized every time a station joins or leaves the ring. During the initialization process, all stations on the ring agree on a “token rotation time.” This is the maximum amount of time that any station has to wait for a token to arrive, and it establishes the minimum level of service on the ring. - Page 96 Setting Up the Hub Set this value higher if the link between stations must handle higher error levels. This can be necessary if you are waiting for minor unit or cable repairs but the ring is still operational. Set this value lower if you are confident of the quality of the link.
- Page 97 4-10 Setting Up the Hub LER_Cutoff. This threshold is the link error rate at which a faulty or poor link connection will be broken. The factory-set default is 10.E-07 (10 ). If the LER exceeds the limits set by this option, the hub will automatically reestablish the connection to this port.
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Page 98: Displaying Smt Parameters
Setting Up the Hub 4-11 Displaying SMT Parameters These three SMT parameters, which you can display but cannot change, provide additional information about ring timer functions: Maximum Token Rotation Time (T-Max) Negotiated Time (T-Neg) Valid Transmission Timer (TVX) Maximum Token Rotation Time (T-Max) The Maximum Token Rotation Time (T-Max) is the maximum length of time allowed for the token to move around the ring. -
Page 99: Downloading New Images
When you power up the hub, it runs a series of self-tests and then executes the software image stored in the flash EPROM. Whenever you receive a software upgrade from 3Com, you will store the new image in an accessible network server that supports TFTP (Trivial File Transfer Protocol). - Page 100 Setting Up the Hub 4-13 Set the TFTP server’s IP address. Type: set boot server [Enter] This prompt appears: Enter server IP address in dot notation? Type the server’s IP address. For example, type: 123.44.55.66 [Enter] This confirmation appears: Boot parameters Method : TFTP Server...
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Page 101: Displaying The Current Download Method
4-14 Setting Up the Hub Enter the default gateway’s IP address. For example, type: set gateway 123.44.66.88 [Enter] Your local administrator should provide the gateway address you need. Reset the hub. Press the RESET button. The new image is now downloaded and stored in the flash EPROM. If no errors are encountered, the hub is reset and the new image is executed. -
Page 102: Definition Of Boot Methods
Setting Up the Hub 4-15 Table 4-1 summarizes the available boot methods. Table 4-1. Definition of Boot Methods Boot Method Definition LOCAL Runs flash EPROM (default) TFTP Uses the TFTP protocol and local configuration parameters to load a new image across the network... -
Page 103: Getting Hub Information
Using the Hub Chapter 5 Using the Hub This chapter discusses how to use the available commands and LED indicators to operate the LinkBuilder FDDI Workgroup Hub. This includes: Getting information about hub operation Interpreting LED behavior Using miscellaneous commands Getting Hub Information To get information about data flow on the FDDI ring through the hub, enter the show commands described in this section. -
Page 104: Display Of Mac Frame Statistics
Using the Hub >sh fstats Raw frame statistics for primary MAC: Total transmit frames = 632 Total received frames = 1561 Total transmit SMT frames = 550 Total received SMT frames = 1513 Total transmit LLC frames = 83 Total received LLC frames = 48 Total received short frames Total received invalid frames = 0... -
Page 105: Show Ip Addresses
Using the Hub Show IP Addresses To display the current IP address, IP netmask, and the Internet broadcast address of the hub, enter the show IP command. An example of the resulting display is shown in Figure 5-3. >sh ip IP address : 128.56.87.25 Netmask : 255.255.0.0... -
Page 106: Show Neighbor Stations
Using the Hub The MIB counters shown in Figure 5-4 are defined in Table 5-2. Table 5-2. Definition of MIB Counters MIB Counter Definition fddiMACFrame-Ct Number of frames received fddiMACCopied-Ct Number of frames copied fddiMACTransmit-Ct Total number of frames transmitted fddiMACToken-Ct Number of tokens fddiMACError-Ct... -
Page 107: Show Ports Information
Using the Hub NOTE: The canonical form is a hexadecimal string, written from left to right, with hyphens separating the individual octets. The noncanonical form uses colons instead of hyphens as separators. Show Ports Information To view the details of a port module, enter the show ports command, followed by the slot number of the specified module. -
Page 108: Module Designation
Using the Hub The Station Management (SMT) acronyms and other line items used in the show ports display are defined below along with the values that may appear. Module Designation The first line in the show ports display gives the slot number of the module represented by the display and the number of modules installed in the hub. -
Page 109: Phy Type
Using the Hub PHY Type The PHY (Physical Layer) protocol specifies the rules for encoding data for transmission from one FDDI station to another. Table 5-4 lists and defines the physical port types for the PHY Type line in Figure 5-7. Table 5-4. -
Page 110: Physical Connection Management States
Using the Hub Table 5-5. Physical Connection Management States Physical Connection Management States Definition Active The port is incorporated into the token ring path. Break A port connection has been broken and a restart process has begun. Connect Both ends of the port’s requested connection are synchronized. -
Page 111: Ler Alarm And Ler Cutoff
Using the Hub Connect State The Connect State indicates the state of each ports’ connection. Table 5-6 lists the values and defines the connect states for the Connect State line in Figure 5-7. Table 5-6. Connect States Connect State Value Definition Active The port is incorporated into the token ring... -
Page 112: Lem Rejects
5-10 Using the Hub LEM Rejects This parameter lists the number of times a link is removed because the error rate has exceeded the threshold test, as determined by the link error monitor (LEM). LEM Count This parameter provides the aggregate link error count, which is set to zero only on station initialization. -
Page 113: Interpreting The Leds
Using the Hub 5-11 Table 5-7. Ring Management States Ring Management State Definition Isolated The initial RMT state. Non_Op The MAC is participating in ring recovery, and the ring is not operational. Ring_Op The MAC is part of an operational FDDI ring. Detect The ring has not been operational for a specified period. -
Page 114: Interpreting Management Module Leds
5-12 Using the Hub Table 5-8. Interpreting Management Module LEDs Color Indicators Meaning Green Hub is on. ATTACH Only one attachment exists at any one time. Configuration refers only to module in slot 1: Green Port 1= B, port 2 = A, other ports = M Green Port 1= S, other ports = M Green... -
Page 115: Wrap Led
Using the Hub 5-13 Additional information about the last four LEDs in Table 5-8 is provided below. WRAP LED If the WRAP LED is on, a ring wrap condition exists on the hub. To determine where the wrap has occurred, enter the show cfm command. This command displays the Configuration Management (CFM) state of the dual ring inside the hub. -
Page 116: Fan Fail Led
FAN FAIL LED If the FAN FAIL LED shows amber, the fan has failed and must be replaced. You must send the hub base unit back to 3Com to replace the fan. Contact your 3Com representative for a Return Materials Authorization (RMA). -
Page 117: Reset Function
Using the Hub 5-15 If a high temperature condition existed but no longer does, this message appears: Hardware: (HIGH TEMP SEEN) To remove this message, enter the clear alarm command, as shown below: clear alarm [Enter] This is the only environmental condition that requires you to invoke the clear alarm command. -
Page 118: Media Module Leds
5-16 Using the Hub Reinitialize. If you press the RESET button only briefly, the hub reinitializes and performs the power-on self-tests (POST). The tests take several seconds to complete. LED Check. If you hold down the RESET button, all functioning LEDs on all installed modules light. -
Page 119: Using Miscellaneous Commands
Using the Hub 5-17 Table 5-10. Interpreting Media Module LEDs Color Indicators Meaning Signal Detect Green The signal is detected. No signal exists. Port State Green Port is in active connection state. Flashing green/off Port is in standby connection state. Port is in disabled or connecting state. -
Page 120: Ping Command
5-18 Using the Hub ping Command The ping command sends echo frames to a host and expects to receive a like number of echo frames in return. Use the ping command to find out whether or not a host on the network is operational. For example, type: ping 128.45.87.20 where 128.45.87.20 is the host address in Internet dot notation. -
Page 121: Route Command
Using the Hub 5-19 If you type the count option with the ping command, the resulting display contains the ping statistics, which include the number of packets sent, the number of packets received, and the percentage of packets lost. For example, if you type this string, in which 64 is the size option variable and 5 is the count option variable: ping 128.45.87.10 64 5... -
Page 122: Arp Command
5-20 Using the Hub By including a metric option, you can indicate the number of hops (number of gateways separating the source and destination) to the designated destination network. For example, to indicate five hops in the above command line, type: route add 128.87.45.12 128.87.45.33 To delete a route from the routing table, use the IP address in Internet dot notation. -
Page 123: Show Log And Clear Log Commands
Using the Hub 5-21 show log and clear log Commands The fault log keeps a limited history of recent faults that have occurred in the system. To display the fault log, type: show log A typical fault log is shown below: Fault Log: 1. -
Page 124: Using Connectivity Commands
5-22 Using the Hub Using Connectivity Commands Three connectivity commands deal with connecting the hub to the FDDI ring, disconnecting the hub from the ring, and logging out of a console session. connect and disconnect Commands Once you have installed the hub and attached it to the ring and to other network devices, you have established a connect condition. -
Page 125: Error Messages
System Messages Appendix A System Messages This appendix lists the error and information messages that may be displayed on the terminal attached to the hub. The messages are listed alphabetically. Each message includes a brief explanation and suggested action. Error Messages Bad route command Meaning: You entered a route command with incorrect syntax. - Page 126 System Messages Invalid IP address xxxxxx Meaning: You entered an IP address using an incorrect format. Action: Reenter the address using the dotted decimal notation format xxx.xxx.xxx.xxx where xxx.xxx.xxx.xxx is the syntactic representation for a 32-bit integer consisting of four 8-bit numbers written in base 10 with dots separating them. Invalid port number xx Meaning: You entered a port number for a port that does not exist.
- Page 127 System Messages Route already exists Meaning: The route you attempted to add with the route command duplicates a route that already exists in the routing table. Action: Reenter the route command with a different route specification. Route does not exist Meaning: The route you attempted to delete with the route command does not exist in the routing table.
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Page 128: Download Messages
System Messages The xx exponent must be >= the current cutoff exponent Meaning: The LER alarm exponent must be greater than the LER cutoff exponent. Action: Set the alarm exponent to be greater than the cutoff value. There are no ports in the management module slot Meaning: You entered the slot number 0 (zero) in the show ports command. - Page 129 The requested image could not be written to flash memory because of a flash chip problem. You no longer have an executable image in flash. Action: Contact 3Com technical support. Refer to Appendix D for instructions on getting 3Com support.
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Page 130: Fault Log Error Code Messages
The x’s in each designation represent any hexadecimal digit. 00xxxxxx Meaning: Nonvolatile RAM error on the management module. Action: Check LOW BATT LED. If the battery is low, replace it and try the operation again. If the problem persists, contact 3Com support. - Page 131 If p is a value between 1 and the maximum number of ports on the module, an error exists on the port number indicated by p. Do not use this port. 3Com recommends replacing the entire module.
- Page 132 If p is a value between 1 and the maximum number of ports on the module, an error exists on the port number indicated by p. Do not use this port. 3Com recommends replacing the entire module.
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Page 133: Appendix B Technical Specifications
Technical Specifications Appendix B Technical Specifications This appendix provides the physical, electrical, and environmental specifications for the LinkBuilder FDDI Workgroup Hub. Physical Characteristics Width 16.8 in (42.6 cm) Depth 11.6 in (29.4 cm) Height 5.2 in (13.3 cm) Weight (empty) 15 lb 2 oz (6.86 kg) Weight (fully loaded) 19 lb (8.5 kg) - Page 134 Technical Specifications Standards Compliance FCC approval: FCC/VDE Class B (for LinkBuilder FDDI Management Module, Fiber-Optic Module, and STP [SDDI] Module) FCC approval: FCC Class A (for LinkBuilder FDDI UTP Module) If no UTP modules are installed in the hub, the hub complies with the limits of a Class B digital device.
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Page 135: Set Commands
Commands Appendix C Commands This appendix describes the commands in the two command sets used to manage and configure the hub. The two command sets are: Management console commands Primitive console commands The commands in each set are grouped into categories and arranged alphabetically within each category. -
Page 136: Set Baud
Commands Example When you enter the set attach command, you are prompted to select an attachment configuration, as shown below: Select one of the following: 1. B/A 2. S/M 3. M/M Attachment port configuration? The possible selections are defined below: Sets ports as B and A for dual attachment or dual homing Sets ports as S and M for single attachment Sets ports as M ports for null attachment only... -
Page 137: Set Boot
Commands You can also enter the baud rate on the same line with the set baud command, as shown below: set baud 4800 [Enter] set boot Syntax set boot [method | filename | server] Simplified Syntax set boot method set boot filename set boot server Description The set boot method command allows you to select the method to use when... -
Page 138: Set Gateway
Commands When you enter the set boot filename command, you are prompted to enter a filename for the software image, as shown below: Enter filename? When you enter the set boot server command, you are prompted to select a boot server, as shown below: Enter Servers IP address in dot notation? When you select a boot method, enter a boot filename, or supply a server address, your response is confirmed, as shown in the following example:... - Page 139 Commands Description The set ip command allows you to set the IP address, netmask, and broadcast address for IP services. set ler Syntax set ler [alarm | cutoff] Simplified Syntax set ler alarm set ler cutoff Description The set ler alarm command sets the link error rate (LER) alarm threshold (fddiPORTLer-Alarm).
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Page 140: Set Tnotify
Commands set pwd Syntax set pwd Description The set pwd command allows you to set and change the password: You are prompted for the old password. You are then prompted for a new password. You are prompted for the new password again. Passwords can be one to eight alphanumeric characters and are case sensitive. -
Page 141: Show Commands
Commands Show Commands show attach Syntax show attach Description The show attach command displays the configuration of the attachment ports (the two leftmost ports) on the module in slot 1. The configuration is not restricted regardless of the slot 1 module type. If the module type physically creates an illegal connection, a warning is displayed. -
Page 142: Show Cfm
Commands The boot method can be one of the following: LOCAL Runs flash EPROM (default) TFTP Uses the TFTP protocol and local configuration parameters to load a new image across the network The show boot load command displays the parameters used and the status of the last download to the flash EPROM. -
Page 143: Show Fstats
Commands show fstats Syntax show fstats Description The show fstats command displays the following raw frame statistics for the hub’s MAC: Total transmit frames Total received frames Total transmit SMT frames Total received SMT frames Total transmit LLC frames Total received LLC frames Total received short frames Total received invalid frames Total aborts... -
Page 144: Show Help
C-10 Commands show help Syntax show [help | ?] Description The show help or show ? command displays the options available for the show commands. show ip Syntax show ip Description The show ip command displays the current IP address, IP netmask, and the Internet broadcast address. -
Page 145: Show Neigh
Commands C-11 Total number of frames received (fddiMACFrame-Ct) Number of frames copied (fddiMACCopied-Ct) Number of frames transmitted (fddiMACTransmit-Ct) Number of tokens (fddiMACToken-Ct) Number of error frames (fddiMACError-Ct) Number of frames with format errors (fddiMACLost-Ct) Number of frames not copied (fddiMACNotCopied-Ct) Number of ring recoveries (fddiMACRingOp-Ct) show neigh Syntax... -
Page 146: Show Ports
C-12 Commands show ports Syntax show ports # Description The show ports command displays information about the ports on the media port module specified by the slot number. After entering show ports, specify the slot number of the module. If you do not specify a slot number, you will be prompted for one. -
Page 147: Show Rev
Commands C-13 Port PCM state (fddiPORTPCMState) – Active – Break – Connect – Join – Next – – Signal – Trace – Verify – Maintenance (abbreviated as “Maint”) Port status (fddiPORTConnectState) – Active – Connecting (abbreviated as “Connect”) – Disabled (abbreviated as “Disable”) –... -
Page 148: Show Ring
C-14 Commands show ring Syntax show ring Description The show ring command displays the Ring Management (RMT) state (fddiMACRMTState) for the MAC on the primary ring. The possible RMT states are listed below: Isolated Non_Op Ring_Op Detect Non_Op_Dup Ring_Op_Dup Directed Trace show sid Syntax... -
Page 149: Show Tneg
Commands C-15 Description The show tmax command displays the value of T-Max (fddiMACT-Max), the maximum length of time allowed for the token to move around the ring. show tneg Syntax show tneg Description The show tneg command displays the current value of T-Neg (fddiMACT-Neg), the ring’s operational Target Token Rotation Time. -
Page 150: Clear
C-16 Commands Description The show tvx command displays the value of the Valid Transmission Timer (fddiMACTvxValue), which is the maximum time allowed by the MAC on the primary ring for the receipt of valid frames or tokens. Diagnostic and Connectivity Commands Syntax arp [dump | del | set] Simplified Syntax... -
Page 151: Disconnect
Commands C-17 The clear alarm command clears the (HIGH TEMP SEEN) alarm that appears on the console when the condition existed previously but is no longer present. connect Syntax connect Description The connect command connects the hub to the FDDI ring. disconnect Syntax discon | disconnect... -
Page 152: Ping
C-18 Commands ping Syntax ping host_address [size] [cnt] Simplified Syntax ping host_address The host address in Internet dot notation. ping host_address size (Optional). Specifies the number of data bytes (defaults to 56 bytes). ping host_address cnt (Optional). Specifies the number of echo frames to be sent. -
Page 153: Primitive Console Commands
Commands C-19 Simplified Syntax route add destination route add destination gateway route add destination gateway metric route delete destination route delete destination gateway route delete destination gateway metric route dump Description The route command adds or deletes a path to a particular device or hub, where: destination is the destination IP address. -
Page 154: Set Attach
C-20 Commands Set Commands set attach Sets the configuration of the first two ports of the module in slot 1. set baud Sets the console (serial) port baud rate. set boot Sets the boot method, filename of the software image, or server IP address. set defaults Sets the factory defaults. -
Page 155: Set Treq
Commands C-21 set treq Sets the Target Token Rotation Time (T-Req). Display Commands show attach Displays the configuration of the attachment ports on the module in slot 1 of the hub. show baud Displays the baud rate setting for the serial port. show boot Displays the boot method, filename of the software image, and boot server IP address. -
Page 156: Show Obs
C-22 Commands show obs Detects the presence or absence of an optical bypass switch. show rev Displays the revision number of the EPROM and software. show sid Displays the 64-bit station ID and the 48-bit MAC address. show tnotify Displays the value of T-Notify. show treq Displays the value of T-Req. -
Page 157: Appendix D Technical Support
Appendix D Technical Support This appendix explains how to obtain worldwide support for 3Com products. On-line Product Support 3Com offers worldwide product support 24 hours a day, seven days a week, through automated on-line systems. CardBoard Bulletin Board Service CardBoard is 3Com’s menu-driven bulletin board service. It contains the most current adapter information in downloadable files. -
Page 158: Automated Fax Service
Up to 19200 baud, 8 data bits, no parity, 1 stop bit For information on international CardBoard access numbers added since this manual was published, contact your local 3Com office. Refer to the list of international sales offices later in this appendix. -
Page 159: Com Documentation On Cd-Rom
Call the following number to locate your local 3Com sales office: U.S. (1) (800) NET-3Com The 3Com sales office will refer you to the nearest 3Com authorized service partner. Outside the U.S. and Canada To locate a 3Com authorized service partner near you, contact your local 3Com sales office. - Page 160 A list of system hardware and software, including revision levels Detail on recent configuration changes, if applicable 3Com’s service partner will determine what action needs to be taken to resolve the problem. 3Com service partners can verify hardware failures and advise you...
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Page 161: Returning Products For Repair
Technical Support Returning Products for Repair A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization number (RMA). A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense. - Page 162 Glossary Glossary Attachment The capability of a station or concentrator (or FDDI hub) for connection into an FDDI network. Stations and concentrators are classified as dual attachment, single attachment, or null attachment. Beacon A special type of frame transmitted when a station detects a logical problem on the ring.
- Page 163 Glossary Concentrator A sophisticated multiplexer or hub device that has additional ports beyond those required for its own attachment to the main ring of an FDDI network. These additional ports are for attaching other FDDI nodes (including single attachment stations [SASs] and other concentrators) in a tree topology. Concentrators may be stand-alone (null attachment) and not connected to the main ring;...
- Page 164 Glossary Dual ring of trees One of the FDDI-supported topologies in which only one ring is permitted to have multiple trees of any depth (consisting of single-attached concentrators and stations), which are cascaded off the main ring. FDDI Fiber Distributed Data Interface. The local area networking standard that provides high bandwidth for interconnecting computers and peripheral devices using a fiber-optic medium in a ring configuration.
- Page 165 Glossary Media Access Control. MAC, the OSI access layer, specifies the access mechanism used by FDDI nodes for transmitting and receiving data on the ring. The MAC is responsible for receiving frames and transmitting frames according to the rules of a timed token rotation protocol, a dynamic protocol unique to FDDI.
- Page 166 Glossary Physical Layer Protocol. The sublayer that describes the medium-independent portion of the OSI Physical layer and specifies the rules for encoding digital data for transmission from one FDDI station to another. It also provides the link between the PMD and the MAC layer. Ping Packet InterNet Groper.
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Page 167: Ring Wrap
Glossary Primary path The segment(s) of the primary ring that pass through a station. Conditions may exist in parts of the network that may cause the path to be in a different ring (that is, secondary instead of primary). Primary ring In the dual counter-rotating token ring architecture, the ring that carries data traffic. - Page 168 Glossary Station An addressable node on an FDDI network capable of transmitting, repeating, and receiving information. A station has exactly one SMT, at least one MAC, at least one PHY, and at least one PMD. Shielded Twisted-Pair. Shielded four-conductor electrical cable that can be used as the communication medium on an FDDI ring in place of optical fiber.
- Page 169 Glossary Upstream The direction on a token ring network that is contrary to the normal direction of data flow (that is, downstream). Unshielded Twisted-Pair. A cable consisting of two twisted- pair conductors that are not insulated. Wrap A ring recovery condition that is automatically activated when a downstream station detects a fault in the primary ring, and the stations on either side of the fault connect the two rings to create a single ring.
- Page 170 Index Index ATTACH LED, 3-16, 5-12 ? command, C-17, C-22 attachment options, 3-1 3Com sales offices, D-3 dual attachment, 3-2 3ComFacts, D-2 dual homing attachment, 3-6 null attachment, 3-5 single attachment, 3-4 A port, 2-23 attachment ports, 4-6 accessing the hub, 2-16...
- Page 171 Index C (continued) CardFacts, D-2 electrical specifications, B-1 cascade connector, 2-11, 3-18 environmental specifications, B-1 CFM, 5-13 error messages, A-1 clear alarm command, 5-15, C-17 clear command, C-16, C-22 clear log command, 5-21, C-16 factory default configuration, 3-7 commands. See under individual command FAN FAIL LED, 5-12, 5-14 names.
- Page 172 Index H (continued) change the baud rate, 2-16 accessing, 2-16 clear the fault log, 5-21 attachment options, 3-1 configure attachment ports, 3-11, 4-6 configuring, 3-1 configure modules, 3-15 connecting to the ring, 2-24 connect a terminal to the hub, 2-16 connecting to a terminal, 2-16 detect the presence of dangerous default configuration, 3-7...
- Page 173 Index management module keys, fiber port module, 2-9 battery, 2-5 functions, 1-11 installing, 4, 2-12 LEDs, 5-12 LEDs, 5-11 removing, 2-14 ATTACH, 3-16, 5-12 RESET button, 1-11, 5-15 FAN FAIL, 5-12, 5-14 Maximum Token Rotation Time (T-Max), HI TEMP, 5-12, 5-14 4-11 Link Error, 5-17 media modules...
- Page 174 Index primitive console commands, 3-9, C-19 password, setting, 4-5 product information service (Ask3Com), D-2 neighbor fields, 5-7 PWR LED, 5-12 state, 5-8 peer-mode connection, 5-13 PHY layer reinitializing, 5-16 functions, 1-5 removing modules, 2-14 port types, 5-7 repair, returning products for, D-5 protocol, 1-5 reset command, 5-15, C-18, C-22 physical specifications, B-1...
- Page 175 Index S (continued) set ler alarm command, 4-9, C-5 functions, 1-6 set ler cutoff command, 4-10, C-5 maximum token rotation time, 4-11 set pwd command, 4-5, C-6, C-20 negotiated time, 4-11 set tnotify command, C-6, C-20 neighbor notification timer, 4-7 set treq command, C-6, C-21 target token rotation time, 4-8 setup.
- Page 176 Index unshielded twisted pair. See UTP. cabling rules, 2-21 media port module, 1-14 pin assignments, 2-22 Valid Transmission Timer (TVX), 4-11 WRAP LED, 5-12, 5-13 wrap state, 3-15, 5-13...
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