Automatic Esa Maintenance; Esa Line Audits; Digitone Receiver Audit - Nortel DMS-100 Series Maintenance Manual

3-28 ESA maintenance overview
Audits correct these fault conditions. The following section on automatic
maintenance describes these conditions.

Automatic ESA maintenance

When fault conditions occur, the host switch and the RLCM initiate audits
and other system processes to clear the fault. For ESA maintenance, the
automatic features are:

ESA line audits

The ESA line audit process returns SysB lines to service after a specified
period of time. In ESA mode, a line is SysB when excessive errors occur.
Each time an error occurs on a line, the error count for that line increases. If
the error count reaches a preset threshold, the line becomes SysB. The last
cause of error is in the TST.
A line in a SysB state cannot originate or terminate a call. The ESA
resources are not tied up. The line audit process returns the SysB lines to
service. This process makes sure that service is available to a line with a
transient fault.

Digitone receiver audit

The DTR audit monitors the status of the Digitone receivers. If a call
process possesses a DTR for longer than two audits, the audit terminates the
process. A cleanup process starts for the CPB. The audit also marks the
DTR as free, which make the DTR ready for use.
297–8351–550 Standard 04.01 August 1999
— dial pulse error (bad digits)
— Digitone error (bad digits)
— ringing error
— coin error
faulty Digitone receivers
static data failure
line audits
DTR audits
downloading static data
routine exercise (REX) tests
— read only memory (ROM) diagnostics
— read access memory (RAM) diagnostics