Nortel DMS-100 Series Maintenance Manual page 166

3-16 PRLCM overview
When C-side communications are restored 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. This communication determines if the PRLCM is in
ESA mode and if the PRLCM can be recovered immediately. The two
possibilities for recovering the PRLCM are a system exit or a manual exit.
ESA system exit
A system exit is an automatic exit from ESA mode started by the DMS CC
without operator interference. A system exit is started if the following
situations are present:
•
•
The following is the system exit sequence:
1. The C-side communications are restored between the DMS CC and the
2. The DMS CC discovers 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 an ESA-exit request to
5. The PRLCM and the ESA processor perform exit operations.
6. The ESA processor tells the LCM to return the LCC to normal operations.
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 started by operating company
personnel at the LCM MAP level using the RTS command. A manual exit is
required if any of the following situations are present:
•
•
Manually overriding a time-out value other than zero by manually busying the
LCM units of the PRLCM at the LCM MAP level starts a manual exit. The
FORCE option should also be used with the BSY command.
297-8361-550 Standard 04.01 September 2000
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.
the ESA processor.
reason for entering ESA mode back to the DMS CC; this information is
displayed in the PM171 log. The PM181 log is generated if the ESA exit
has problems.
Both LCM units of the PRLCM are in a ManB state.
The PRLCM_XPMESAEXIT office parameter time-out value is zero.