Nortel DMS-100 Series Maintenance Manual page 185

The following steps describe the manual exit sequence:
1 The system restores C-side communications between the CM and the
OPAC.
2 The CM discovers the OPAC is in ESA mode.
3 The CM queries the OPAC for the number of active calls.
4 The CM displays the number of active calls on the MAP display. The
CM queries the operating company personnel if the personnel want
ESA-exit.
5 If operating company personnel confirms the ESA-exit, the CM sends
the ESA-exit request to the ESA processor. If operating company
personnel do not want the ESA-exit, the system leaves the OPAC ManB.
The OPAC stays in ESA mode.
6 The OPAC and the ESA processor perform exit operations.
7 The ESA processor tells the LCM to return the LCC card to normal
operations.
8 The ESA processor sends the following to the CM:
— operational measurements
— peg counts
— the reason that the OPAC entered ESA mode
The system displays this information in the PM171 and PM181 logs.
9 The CM returns the OPAC to service.
10 Return the ESA processor and RMM nodes to service.
11 Receiver off-hook.
Tones during ESA mode
The ESA tone and clock card (NT6X75AA) provides five continuous tones
when an OPAC is in ESA mode. The LCM interrupts these tones to give the
tones the system specifies.
The tones appear on channel 16 on the incoming C-side ports of the OPAC.
The OPAC ESA tones, their channel appearance, and cadence appear in the
following table.
DMS-100 Family OPAC Maintenance Manual XPM12 and up
ESA maintenance overview 3-25