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DECconcentrator
Order Number: EKDEFCNPS004
DECconcentrator
TM

500
TM
Problem Solving
NOTICE
Class A Computing Device:
This equipment 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, measures taken to correct the interference are at the users expense.
CAUTION
The people who install the cabling system described in this manual should know local
building codes, fire codes, and any other applicable codes or regulations. The manufacturers
or their distributors and agents will not be responsible for damage due to improperly
installed cabling, neglect, misuse, or improper connection of devices to the cabling system.
NOTICE
Class 1 Laser Device:
The lasers in this equipment are Class 1 devices, compliant with CDRH Rules 21, CFR
Subchapter J, Part 1040.10, at date of manufacture. Class 1 laser devices are not
considered to be hazardous. Order Number: EKDEFCNPS004
DECconcentrator 500
Problem Solving
January 1992
This manual describes how to troubleshoot and service the
DECconcentrator 500 unit. Information includes an overview,
troubleshooting and testing, and removal and replacement
procedures.
For additional information about the option cards, refer to the
specific option card installation documentation.
Supersession/Update Information:
This is a revised manual. This manual was produced by Telecommunications and Networks Publications.
EKDEFCNPS004
January 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.
Copyright
©
1992 by Digital Equipment Corporation
All Rights Reserved
Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation:
DEC
DECndu
DESTA
DECbridge
DECnet
ThinWire
DECconcentrator
DECrepeater
UNIBUS
DECconnect
DECUS
VAX
DECelms
DELNI
VAXcluster
DECmcc
DEMPR
VAXstation
VMS
Hewlett-Packard and HP are registered trademarks of Hewlett-Packard Company.
ST is a trademark of American Telephone and Telegraph Company. iii
Contents
Preface
1
Controls and Indicators
1.1
Controls and Indicators
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Network Management Switch
12
. . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
Out-of-Band Management
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
Troubleshooting and Testing
2.1
Tools and References
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2
Problem-Solving Checklist
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Tests
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
Self-Test
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1
Network Management Initiated Self-Test
23
. . . . . . . . . . . . . . .
2.4.2
Power-up Initiated Self-Test
23
. . . . . . . . . . . . . . . . . . . . . . . . . .
2.5
Problem Solving Using the LED Indicators
27
. . . . . . . . . . . . . . . .
2.6
Loopback Testing
210
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7
Measuring the Optical Power
210
. . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Removal and Replacement Procedures
3.1
Preparing the Concentrator for Servicing
31
. . . . . . . . . . . . . . . . . .
3.1.1
Removing and Replacing the Plastic Enclosure
32
. . . . . . . . . . .
3.1.2
Removing and Replacing a Rackmount Unit
34
. . . . . . . . . . . . . iv
3.2
Removing and Replacing Concentrator FRUs
36
. . . . . . . . . . . . . .
3.2.1
Removing and Replacing Option Cards
38
. . . . . . . . . . . . . . . . .
3.2.2
Opening the Chassis Cover
310
. . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3
Removing and Replacing the OBM Card
312
. . . . . . . . . . . . . . . .
3.2.4
Removing and Replacing the Controller/Backplane Board
314
. .
3.2.5
Removing and Replacing the Fan
316
. . . . . . . . . . . . . . . . . . . . .
3.2.6
Removing and Replacing the Power Supply
318
. . . . . . . . . . . . .
3.2.7
Removing and Replacing the Power Connector and Filter
320
. .
3.2.8
Removing and Replacing the Circuit Breaker
322
. . . . . . . . . . . .
3.3
Reassembling and Reinstallating the Concentrator
324
. . . . . . . . . .
A
Parts List
B
Specifications
B.1
Physical Specifications
B1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.1.1
Environmental Specifications
B2
. . . . . . . . . . . . . . . . . . . . . . . . .
B.1.2
Electrical Specifications
B3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.2
Power Supply
B4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.3
Fiber Cable Specifications
B5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.4
General Specifications for ThinWire and Shielded Twisted-Pair
Cable
B7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B.5
ThinWire Cabling Specifications
B7
. . . . . . . . . . . . . . . . . . . . . . . .
B.6
Shielded Twisted-Pair Cabling Specifications
B7
. . . . . . . . . . . . . .
C
Related Documents
Figures
11:
Controls and Indicators
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21:
Fault and Port Status LED Problem-Solving Flow Chart
24
. . . . . .
22:
Measuring the Transmit Power (Multimode)
212
. . . . . . . . . . . . . . . v
23:
Measuring the Receive Power (Multimode)
214
. . . . . . . . . . . . . . . .
31:
Plastic Enclosure Removal and Replacement
33
. . . . . . . . . . . . . . .
32:
Rackmount Unit Removal and Replacement
35
. . . . . . . . . . . . . . .
33:
Rackmount Bracket Removal and Replacement
36
. . . . . . . . . . . . .
34:
Option Card Removal and Replacement
39
. . . . . . . . . . . . . . . . . . .
35:
Chassis Cover Removal and Replacement
311
. . . . . . . . . . . . . . . . .
36:
OBM Card Removal and Replacement
313
. . . . . . . . . . . . . . . . . . . .
37:
Controller/Backplane Board Removal and Replacement
315
. . . . . .
38:
Fan Removal and Replacement
317
. . . . . . . . . . . . . . . . . . . . . . . . .
39:
Power Supply Removal and Replacement
319
. . . . . . . . . . . . . . . . .
310:
Power Connector and Filter Removal and Replacement
321
. . . . . .
311:
Circuit Breaker Removal and Replacement
323
. . . . . . . . . . . . . . . .
A1:
DECconcentrator 500 FRUs
A2
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
11:
DECconcentrator 500 Controls and Connectors
12
. . . . . . . . . . . . .
12:
DECconcentrator 500 Indicators
12
. . . . . . . . . . . . . . . . . . . . . . . .
13:
Network Management Configuration Switch Settings
13
. . . . . . . .
21:
Main Unit Problem Solving
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
22:
Network Management Card Problem Solving
28
. . . . . . . . . . . . . .
23:
Port Card Problem Solving
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
24:
Optical Bypass Relay Problem Solving
29
. . . . . . . . . . . . . . . . . . .
25:
Problem Solving During Loopback Testing
210
. . . . . . . . . . . . . . . .
26:
FDDI Transmit and Receive Power Calculation
215
. . . . . . . . . . . . .
A1:
DECconcentrator 500 Parts List
A3
. . . . . . . . . . . . . . . . . . . . . . . . .
B1:
Physical Specifications
B1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B2:
Environmental Specifications
B2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
B3:
Electrical Specifications
B3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B4:
Power Supply Specifications
B4
. . . . . . . . . . . . . . . . . . . . . . . . . . .
B5:
Multimode Fiber Cable Specifications
B5
. . . . . . . . . . . . . . . . . . . .
B6:
Alternate Multimode Fiber Cable Specifications
B6
. . . . . . . . . . . .
B7:
Single-Mode Fiber Cable Specifications
B6
. . . . . . . . . . . . . . . . . . vii
Safety
!
Any warning or caution that appears in this manual is defined as follows:
War