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DS1-BD (DS1 Interface Circuit Pack)
Issue 4 May 2002 10-655 555-233-123
Slip Alarm Inquiry Test (144)
Slips occur when transmitter and receiver are not running at precisely the same
clock rate. The DS1 Interface circuit pack can detect both positive and negative
slips on the DS1 facility. The Slip Alarm Inquiry Test is used to acquire the total
number of slips occurred on a DS1 link.
When the DS1 Interface circuit pack detects a slip condition, the circuit pack will
increase the on-board slip counter by 1. A SLIP-COUNT message is
spontaneously sent to the system software after the counter reaches a threshold
(for example, 88). When the maintenance software receives the SLIP-COUNT
message, the Slip Alarm Inquiry Test is initiated to query the slip counters on DS1
Interface circuit pack and total the slip counts in the maintenance software.
If the count of slips is over the threshold, a Minor alarm is raised against the DS1
Interface circuit pack. All trunks of the DS1 Interface circuit pack are still in the
in-service state. If the DS1 Interface circuit pack is used to supply the system
synchronization source, the MINOR alarm will initiate a synchronization source
switch. See “TDM-BUS” and “SYNC (Synchronization)” for details.
Table 10-241. TEST #144 Slip Alarm Inquiry Test
Error
Code
Test Result Description/Recommendation
ABORT Internal system error
2100 ABORT Could not allocate the necessary system resources to run this
test.
1. Retry the command at 1-minute intervals a maximum of 5
times.
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