Nortel DMS 100 Series Maintenance Manual page 290

8-2 RSC-M trouble isolation and correction
Alarms
Audible and visual alarms indicate that corrective action is required. The level
of the alarm indicates alarm severity and emergency of corrective action.
Alarm severity and emergency appears as minor, major, or critical. A
description of the alarm conditions appears in the following table.
Table 8-1 Assessing PM alarms from the MAP display (Sheet 1 of 2)
MTC level
PM RCO2
PM RCO2
M
PM RCO2
M
297-8223-550 Standard 04.02 November 2000
PM level Possible scenarios
ISTb 1 One unit or both units experience minor problems.
These problems normally do not involve the
peripheral processor (PP).
A static data mismatch occurs between an RSC-M
unit and the central control (CC).
A nonmessaging central side (C-side) link is
out-of-service (OOS).
A peripheral side (P-side) link is OOS.
ISTb 1 One of the units is system busy (SysB). A PP card
failure normally causes this condition. If the unit is
the active unit, the peripheral module (PM) software
performs a switch of activity (SWACT) on the units.
Check for PM128 logs.
ISTb 1 One of the RSC-M units is OOS. The RSC-M can
process both voice and data calls.