DEC DECrepeater 90T+ Manuale utente
DECrepeater90TandDECrepeater90T+
Owner’sManual
Order Number: EK–DETMR–OM. C01
Digital Equipment Corporation
Maynard, Massachusetts
Third Edition, December 1992
The information in this document is subject to change without notice and should not be construed
as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no
responsibility for any errors that may appear in this document.
No responsibility is assumed for the use or reliability of software on equipment that is not supplied
by Digital Equipment Corporation or its affiliated companies.
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as set forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software
clause at DEFARS 252.227–7013.
© Digital Equipment Corporation 1991, 1992.
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual generates, uses, and may emit radio
frequency energy. The equipment has been type tested and found to comply with the limits for
a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed
to provide reasonable protection against such radio frequency interference when operated in a
commercial environment. Operation of this equipment in a residential area may cause interference,
in which case the user at his own expense may be required to take measures to correct the
interference.
The following are trademarks of Digital Equipment Corporation: BI, DEC, DECbridge, DECconnect,
DEChub, DECmcc, DECnet, DECrepeater, DECserver, Digital, LAT, MicroVAX, ThinWire, ULTRIX,
UNIBUS, VAX, VAX–11/780, VAX–11/785, VAX 3600, VAX 3900, VAX 6000, VAX 6400, VAX 9000,
VAXcluster, VAX DOCUMENT, VAXELN, VAXstation, VMS, VT, and the DIGITAL logo.
All other trademarks and registered trademarks are the property of their respective holders.
This document was prepared using VAX DOCUMENT, Version 2.1.
Contents
About this Manual ...................................... vii
1 Overview
Introduction . . . ....................................... 1–1
Description ........................................... 1–1
Features ............................................. 1–2
LEDs and Connectors . . . ............................... 1–3
2 Configuring the DECrepeater 90T and
DECrepeater 90T+ Repeaters
Introduction . . . ....................................... 2–1
Configuration Rules .................................... 2–1
Segment Length Constraints . . . ....................... 2–1
Network Constraints . ............................... 2–2
3 Installation
Introduction . . . ....................................... 3–1
Site Considerations .................................... 3–1
Standalone Installation . . ............................... 3–1
Mount the DECrepeater 90T and DECrepeater 90T+ on a
Wall............................................. 3–2
Standalone Installation Connections .................... 3–4
Backplane Installation . . . ............................... 3–6
Shielded Twisted-Pair Environments ....................... 3–8
iii
4 Managing the DECrepeater 90T and DECrepeater 90T+
Introduction . . . ....................................... 4–1
Functions ............................................ 4–1
Components Needed . . ............................... 4–2
Accessing MOP from VMS Systems . ....................... 4–2
Accessing MOP from ULTRIX Systems ..................... 4–3
Console Carrier User Interface ........................... 4–4
Console Carrier Command Language....................... 4–4
Description of Command Parameters .................... 4–6
Description of Commands ............................... 4–7
Typical Management Techniques . . . ....................... 4–13
Remote Network Management with the DECbridge 90 ...... 4–13
Management Disconnect . . . ....................... 4–13
Management Session ............................. 4–14
Example of a Typical Management Session ............ 4–14
If Problems are Reported . . . ....................... 4–15
To Disable a Port . ............................... 4–16
To Reset the Repeater ............................ 4–16
Error Messages ....................................... 4–17
Standalone Configuration Management ..................... 4–19
5 Troubleshooting
Introduction . . . ....................................... 5–1
Port Partitioning ...................................... 5–1
DECrepeater 90T and DECrepeater 90T+ Standalone
Troubleshooting ....................................... 5–2
DECrepeater 90T and DECrepeater 90T+ Backplane
Troubleshooting ....................................... 5–5
A Specifications and Parts List
Introduction . . . ....................................... A–1
Physical Dimensions ................................... A–1
Environmental Specifications ............................. A–2
Power Specifications.................................... A–3
MJ Pin Assignments ................................... A–4
Parts List ............................................ A–4
iv
B Management Details
Introduction . . . ....................................... B–1
Designating a Hub Manager ............................. B–1
Annotating the Bridge Address Table ...................... B–2
Using the WGB Address Table for Work Group Management .... B–3
C Documentation and Ordering
Introduction . . . ....................................... C–1
Related Documentation . . ............................... C–1
Ordering Information ................................... C–1
Index
Figures
1–1 Sample DECrepeater 90T Configuration ........... 1–2
1–2 DECrepeater 90T LEDs and Connectors ........... 1–3
1–3 DECrepeater 90T+ LEDs and Connectors .......... 1–4
3–1 Removing the Back Cover ...................... 3–2
3–2 Mounting Screws ............................. 3–3
3–3 Standalone Installation . ....................... 3–5
3–4 Installing a DECrepeater 90T Repeater into the
DEChub 90 Backplane . . ....................... 3–7
4–1 Sample Configuration . . ....................... 4–7
4–2 Typical Network Topology Map . . . ............... 4–14
Tables
1–1 DECrepeater 90T and DECrepeater 90T+ LEDs and
Connectors . . . ............................... 1–5
2–1 Segment Lengths ............................. 2–1
4–1 Ethernet Circuit Names for Systems .............. 4–2
4–2 Summary of DECrepeater 90T and DECrepeater 90T+
Commands . . . ............................... 4–5
4–3 Status Messages and Causes .................... 4–15
4–4 DECbridge 90 Messages . ....................... 4–17
5–1 DECrepeater 90T and DECrepeater 90T+ Status
Indicators ................................... 5–2
v
5–2 Troubleshooting a DECrepeater 90T and
DECrepeater 90T+ Standalone Unit .............. 5–2
5–3 Troubleshooting a DECrepeater 90T and
DECrepeater 90T+ in a DEChub 90 Backplane ...... 5–5
A–1 Physical Dimensions . . . ....................... A–1
A–2 Operating Environment . ....................... A–2
A–3 Shipping Environment . . ....................... A–2
A–4 Power Specifications........................... A–3
A–5 DECrepeater 90T and DECrepeater 90T+ Input ..... A–3
A–6 Parts List ................................... A–4
vi
About this Manual
Introduction
This manual describes how to install, operate, and maintain the DECrepeater 90T
and DECrepeater 90T+ repeaters. These repeaters are 9-port twisted-pair
repeaters designed to function as standalone units or as managed units in the
DEChub 90 backplane. The functionality of the DECrepeater 90T+ is the same
as the DECrepeater 90T except that it supports shielded as well as unshielded
twisted-pair cable.
In this manual, the term repeater may be used to denote both the
DECrepeater 90T and the DECrepeater 90T+ repeaters. When information is
unique to a specific repeater, the terms DECrepeater 90T and DECrepeater 90T+
are used.
Organization
This manual contains five chapters and three appendices.
Chapter Description
1 Provides an overview of the DECrepeater 90T and DECrepeater 90T+
and briefly describes the features of these repeaters.
2 Describes the configuration rules and conditions of operation for the
DECrepeater 90T and DECrepeater 90T+ in a ThinWire Ethernet
system or standard Ethernet network.
3 Describes how to install the DECrepeater 90T and DECrepeater 90T+.
4 Describes how to manage the DECrepeater 90T and DECrepeater 90T+
on a network.
5 Provides basic troubleshooting information.
Appendix A Provides the physical dimensions, environmental (operating and
shipping) specifications, electrical specifications, and a parts list.
Appendix B Provides more detailed information about management issues.
Appendix C Provides information about related documentation and ordering.
vii
Conventions
The following conventions are used in this manual:
Convention Meaning
Note Provides general information.
!
A number in a black circle in text refers to
the corresponding number in an accompanying
illustration.
[] In command descriptions, brackets indicate
optional elements.
Italic type Italic type emphasizes important information,
indicates complete titles of documents, and in
command descriptions, indicates a variable that
you supply.
SHOW ADDRESS In text, commands are shown in all uppercase
letters to differentiate them from regular text.
For the VMS operating system, you can enter
commands in either uppercase or lowercase letters.
For the ULTRIX operating system, commands must
be entered as indicated in the examples.
DECbridge>
Text that the system displays on the screen is
shown in monospaced type.
SHOW REPEATER 1
Text that you enter is shown in bold monospaced
type.
Return A key name enclosed in a box indicates that you
press that key.
viii
1
Overview
Introduction
This chapter describes the DECrepeater 90T and DECrepeater 90T+ repeaters
and briefly summarizes the features of these repeaters.
Description
The DECrepeater 90T and DECrepeater 90T+ are 9-port repeaters designed for
the IEEE 802.3 standard CSMA/CD networks. The repeaters have one ThinWire
port and eight twisted-pair ports. The ThinWire port complies with the IEEE
802.3 standard for 10Base2 networks; the twisted-pair ports comply with the
IEEE 802.3 standard for 10BaseT networks.
The DECrepeater 90T twisted-pair ports support unshielded twisted-pair cable;
the DECrepeater 90T+ twisted-pair ports support both shielded and unshielded
twisted-pair cable. Installations that require a shielded 100-ohm twisted-pair
cable use a shielded MJ connector. Installations that require a 160-ohm shielded
media connection are accommodated by adding 10BaseT baluns. See Chapter 3,
Installation, for more information about shielded twisted-pair environments.
The repeaters can operate in standalone configurations or as managed repeaters
when installed in a DEChub 90 backplane with a DECbridge 90 series bridge.
Figure 1–1 shows a typical configuration of the DECrepeater 90T repeater in an
Ethernet local area network (LAN).
Overview 1–1
Figure 1–1 Sample DECrepeater 90T Configuration
DECrepeater 90C DECrepeater 90LDECrepeater 90T
Computer 2 ServerComputer 1
DECbridge 90
Work Group Bridge
Workstation DECserverPC Workstation
Ethernet Backbone
Work Group
Work Group ThinWire Segment
LJ-02765-TI0
When operating as a standalone unit, the repeater is an unmanaged repeater
with a separate power supply connected to the repeater by a cable with a 7-pin
connector. The auto-ranging power supply is modular and accommodates either a
North American 120-volt or an international 240-volt wall outlet.
Features
The following list summarizes the features of the DECrepeater 90T and
DECrepeater 90T+ repeaters:
• One ThinWire (10Base2) port
• Eight twisted-pair (10BaseT) ports
• Standalone or installable in a DEChub 90 backplane
• Manageable when installed in a DEChub 90 backplane
For detailed information about how to configure the repeaters, see Chapter 2,
Configuring the DECrepeater 90T and DECrepeater 90T+ Repeaters. For detailed
information about how to install the repeaters, see Chapter 3, Installation.
1–2 Overview
Questo manuale è adatto per i seguenti modelli
1
Indice
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