Nortel DMS-100 Series Maintenance Manual page 120

2-18 PRLCM overview
When C-side communication resumes between the PRLCM 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. The DMSCC determines if the PRLCM is in ESA
mode. The DMSCC determines if the system can recover the PRLCM
immediately. Recovery of the PRLCM occurs through a system exit or a
manual exit.
ESA system exit
A system exit is an automatic exit from ESA mode that the DMS CC starts
without an operator. A system exit can start if the following conditions
occur:
The following sequence is the system exit sequence:
1 The C-side communication continues between the DMS CC and the
2 The DMS CC discovers that the PRLCM is in ESA mode.
3 The DMS CC enters ESA time-out mode.
4 When the DMS CC times out, the DMS CC sends a request to the ESA
5 The PRLCM 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 returns the PRLCM to service.
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
initiate at the LCM MAP level. Operating company personnel enter the RTS
command to initiate a manual exit. The following conditions require a
manual exit:
297–8351–550 Standard 04.01 August 1999
At least one LCM unit of the PRLCM is SysB or C-side busy (CBsy).
The PRLCM_XPMESAEXIT office parameter time-out value is not
zero.
PRLCM.
processor to exit ESA.
operations.
reason for the ESA mode back to the DMS CC. The PM171 log
displays this information. The system generates the PM181 log if the
ESA exit has problems.
Both LCM units of the PRLCM are ManB.