Table 75: LD 73 - Define slip thresholds
Prompt Response Description
REQ CHG Request a Change.
TYPE PRI2 Primary Rate Interface 2.
FEAT LPTI Loop Timer.
5 24H This entry establishes a maintenance threshold of 5
slips in 24 hours.
SLIP 20 1H This entry establishes an OOS threshold of 20H [32]
slips in 1 hour
.
Group 2 errors
Group 2 errors are event-based alarms that can be separated into Red (local) and
Yellow (far-
end) alarms.
Yellow (far-end) alarms
A Yellow alarm on the 2.0 Mb PRI card indicates that the card is receiving an alarm indication
from the far end.
This type of alarm may be received in two ways:
1. Remote Alarm Indication (RAI) — Bit 3 of non-FAS frame set.
2. Alarm Indication Signal (AIS) — All 1s on the carrier.
Since the 2.0 Mb PRI is receiving a Yellow alarm signal, that indicates that there is a carrier
connection, but the far end is not ready. It is possible, however, that the carrier connection is
one-way only (2.0 Mb PRI receiving).
When the 2.0 Mb PRI receives a Yellow alarm signal, all channels are placed in a maintenance
busy mode (MBSY). Group 2 Yellow alarms are recorded (LCNT) on each occurrence, but the
card is not placed into an out-of-service state.
Red (local) alarms
A Red alarm on the PRI card indicates that the card is having problems synchronizing with the
incoming bit stream.
2.0 Mb PRI maintenance
154 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
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