Nortel DMS-100 Series Maintenance Manual page 144

3-22 ESA maintenance overview
When C-side communications restore between the RLCM and the DMS CC,
the DMS CC initiates the ESA exit sequence. Before the ESA exit sequence
begins, the DMS CC communicates with the ESA processor over the
nailed-up connection. This communication determines if the RLCM is in
ESA mode and if recovery of the RLCM can occur immediately. The two
possibilities for the recovery of the RLCM are a system exit or a manual
exit.
ESA system exit
A system exit is an automatic exit from ESA mode that the DMS CC
requests. This exit does not require operator interference. The DMS CC
starts a system exit if the following conditions are present:
The following list of steps is the system exit sequence.
1 The C-side communications restore between the DMS CC and the
2 The DMS CC discovers the RLCM is in ESA mode.
3 The DMS CC enters ESA time-out mode.
4 When the DMS CC times out, the DMS CC sends an ESA-exit request to
5 The RLCM and the ESA processor perform exit operations.
6 The ESA processor tells the LCM to return the LCC to normal
7 The ESA processor sends operational measurements, peg counts, and the
8 The DMS CC RTS the RLCM.
9 Return to service the ESA processor and RMM nodes.
ESA manual exit
A manual exit is an exit from ESA mode that operating company personnel
start at the LCM MAP level through the RTS command. A manual exit is
required if one of the following conditions are present:
297–8351–550 Standard 04.01 August 1999
A minimum of one LCM unit of the RLCM is SysB or C-side busy
(CBsy).
The RLCM_XPMESAEXIT office parameter time-out value is not zero.
RLCM.
the ESA processor.
operations.
reason for the entry of ESA mode back to the DMS CC. This
information appears in the PM171 log. The system generates the PM181
log if the ESA exit has problems.
The two LCM units of the RLCM are in a ManB state.
The RLCM_XPMESAEXIT office parameter time-out value is zero.