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Access Navigator - Release 1.8 August 2003 15-5
Diagnostics & Troubleshooting
DS1 Failures
Figure 15-1. Access Navigator Alarm Signal Response
Access Navigator DS1 interfaces respond as follows:
1. Display red alarm status on Access Navigator
2. Return yellow alarm pattern (01000000) over same DS1
3. Forward all-ones alarm pattern (11111111) over the 24 DS0s
DS1 Failures
In the event of a DS1 failure, the Access Navigator / GR-303 sends an on-hook signal toward the switch
for each affected DS0 to terminate the calls.
Event Log
In addition to recording alarm events, the Access Navigator maintains a log of the most recent 400
alarms and informational (info) events that do not affect service. The Access Navigator maintains a log
of the following event types.
l Critical alarms
l Major alarms
l Minor alarms
l Informational events
Log reports are available using the CLI log command (see Log on page 18-38). You can also filter the
log reports to display only certain event types, as well as only equipment or DS1 events.
Syntax: log
Displays all log events except BERT, TMC, and Configuration change events.
Syntax: log <major|minor|alert|info>
Displays only alarms with a specified severity.
DS1
Interface
Receive DS1
Blue (RAI),
or Detect
LOF or LOS
Return DS1
Yellow (AIS)
Forward All-Ones
Pattern over the
Affected DS0s
1:0
DCS
DS1
Interface
DS1
Interface
DS1
Interface