MAINTENANCE
GENERAL MAINTENANCE INFORMATION
System Errors and Alarms
During periodic testing, a maintenance audit could detect a system error that
automatically generates an error record.
Depending on severity, the error
record is stored in one of following three tables in the Error Log:
●
Permanent System Alarms
●
Transient System Errors
●
Most Recent System Errors.
The three error tables can be displayed at the System Administration
Terminal (SAT). The error tables are used to diagnose and analyze problems,
particularly when the problem has not caused an alarm or when alarms
cannot be retired by replacing faulty units.
The errors are listed in the error tables by time of occurrence. Resolved and
unresolved errors are listed, thus providing a profile of the past and current
state of the system. Error message explanations are provided under “Error
Messages” in this section.
Emergency Transfer
System 25 has emergency transfer capability in case of total system outage.
The Emergency Transfer Unit (ETU) connects preassigned single-line voice
terminals directly to the CO, bypassing the System 25. Emergency transfer is
invoked by loss of ac power or by any failure of the system that prevents it
from processing calls.
Circuit Pack LEDs
During the various states of operation (start-up testing, normal operation, and
failure), CP
Note:
LEDs appear as follows:
The first two listings, Memory and Call Processor, apply only
to Release 1.
The CPU/Memory circuit pack applies to
Release 2 and Release 3.
Содержание Network Adapter 25
Страница 1: ...AT T AT T System 25 Installation and Maintenance Manual 555 540 103 B November 1995 ...
Страница 18: ...APPENDIX F Administration Error Messages GLOSSARY I N D E X F 1 G 1 I 1 viii ...
Страница 29: ...INSTALLATION NOTE 9 WIDE MOUNTING CENTERS ARE 8 1 2 APART FLANGES OVERLAPPED Figure 2 1 10B ETU 2 5 ...
Страница 31: ...INSTALLATION MOUNTING CENTERS WHEN FLANGES ARE OVERLAPPED Figure 2 2 617A Panel 2 7 ...
Страница 33: ...INSTALLATION Z21OA1 ADAPTER Y ADAPTER WP90851 L1 858A ADAPTER Figure 2 3 SIP Adapters 2 9 ...
Страница 50: ...INSTALLATION Figure 2 10 Three Cabinet System Front View With Covers Removed 2 26 ...
Страница 51: ...INSTALLATION Figure 2 11 Position of Shorting Plugs on CPU Memory Circuit Pack 2 27 ...
Страница 72: ...INSTALLATION UPPER ADAPTER MOUNTING CLIP Figure 2 18 Mounting Adapters ...
Страница 85: ...INSTALLATION 2 61 ...
Страница 92: ...INSTALLATION 2 68 ...
Страница 103: ...INSTALLATION Figure 2 32 10B Emergency Transfer Unit 2 78 ...
Страница 104: ...INSTALLATION Figure 2 33 Emergency Transfer Unit Connections 2 79 ...
Страница 109: ...INSTALLATION Figure 2 35 Attendant Console With DXS Console 2 84 ...
Страница 146: ...INSTALLATION 2 119b This page intentionally left blank November 1995 ...
Страница 153: ...INSTALLATION This page intentionally left blank 2 124b November 1995 ...
Страница 156: ...Figure 2 57 278A Adaptor Plug Positions for Connecting TN763 Circuit Pack to Paging System 2 127 ...
Страница 223: ...MAINTENANCE Figure 4 2 Clearing Supply Troubles Sheet 1 of 2 4 47 ...
Страница 224: ...MAINTENANCE Figure 4 2 Clearing Power Supply Troubles Sheet 2 of 2 ...
Страница 225: ...MAINTENANCE Figure 4 3 Clearing CO Trunk Troubles 4 49 ...
Страница 226: ...MAINTENANCE Figure 4 4 Clearing 4 Wire Tie Trunk Troubles Sheet 1 of 4 4 50 ...
Страница 227: ...MAINTENANCE Figure 4 4 Clearing 4 Wire Tie Trunk Troubles Sheet 2 of 4 4 51 ...
Страница 228: ...MAINTENANCE Figure 4 4 Clearing 4 Wire Tie Trunk Troubles Sheet 3 of 4 4 52 ...
Страница 229: ...MAINTENANCE Figure 4 4 Clearing 4 Wire Tie Trunk Troubles Sheet 4 of 4 4 53 ...
Страница 231: ...Figure 4 6 Clearing Tie Trunk Troubles Sheet 1 of 5 4 55 ...
Страница 232: ...MAINTENANCE 6 7 8 9 10 Figure 4 6 Clearing Tie Trunk Troubles Sheet 2 of 5 4 56 ...
Страница 233: ...MAINTENANCE Figure 4 6 Clearing Tie Trunk Troubles Sheet 3 of 5 4 57 ...
Страница 234: ...MAINTENANCE Figure 4 6 Clearing Tie Trunk Troubles Sheet 4 of 5 4 58 ...
Страница 235: ...MAINTENANCE Figure 4 6 Clearing Tie Trunk Troubles Sheet 5 of 5 4 59 ...
Страница 236: ...MAINTENANCE Figure 4 7 Clearing Paging Equipment Troubles ...
Страница 250: ...MAINTENANCE Figure 4 9 System Cabinet Backplane Wiring Side Sheet 2 of 2 4 74 ...
Страница 251: ...MAINTENANCE Figure 4 10 TDM Signal Designations on Cabinet Backplane 4 75 ...
Страница 252: ...MAINTENANCE Figure 4 11 Power Designations on Cabinet Backplane 4 76 ...
Страница 263: ...MAINTENANCE Figure 4 12 Clearing Virtual Facilities Troubles Sheet 1 of 3 ...
Страница 264: ...MAINTENANCE Figure 4 12 Clearing Virtual Facilities Troubles Sheet 2 of 3 4 87 ...
Страница 265: ...MAINTENANCE Figure 4 12 Clearing Virtual Facilities Troubles Sheet 3 of 3 4 88 ...
Страница 271: ...MAINTENANCE Figure 4 13 Clearing Switched Loop Attendant Console Troubles Sheet 1 of 5 ...
Страница 272: ...MAINTENANCE 4 13 Clearing Switched Loop 2 of 5 Console Troubles Sheet 4 95 ...
Страница 273: ...MAINTENANCE Figure 4 13 Clearing Switched 3 of 5 Loop Attendant Console Troubles Sheet 4 96 ...
Страница 274: ...MAINTENANCE 4 13 Clearing Switched 4 of 5 Console Troubles 4 97 ...
Страница 305: ...APPENDIX C System Additions or Changes Figure C 1 Typical System 25 Port Circuit Pack C 4 November 1995 ...
Страница 321: ...APPENDIX E Administration Codes and Data This page is intentionally blank E 2 b ...
Страница 341: ...APPENDIX E Administration Codes and Data Table E J MET Set Button Defaults Cannot be changed E 22 ...