Intracalling During Esa Mode; Esa Call Processing; Channel Configuration - Nortel DMS-100 Series Maintenance Manual

2-16 PRLCM overview
Additional LTC hardware
The additional hardware in feature package NTX154AA for the host LTC is
the messaging card, NT6X69. This card allows communications with the
ESA processor.

Intracalling during ESA mode

Intracalling allows the system to switch calls at the remote location during
ESA mode.
The number of designated intracalling channels on the PRLCM determines
the number of intraswitched and interswitched calls that ESAs support. The
number of channels depends on the number of equipped PCM30 ports
available. The number of channels also depends on the number of PCM30
links used for host communication.
During ESA mode, the ESA processor handles all intracalling. The ESA
processor contains parts of the translation data detected in the DMS CC.

ESA call processing

When the PRLCM is in ESA mode, the ESA CC handles line-to-line call
processing. Refer to the figure ESA CC Basic Call Processing Structure.
The ESA CC has only one queue. The server sends all messages to this
first-in first-out queue for call processing. Call processing requires terminal
data. The static data downloaded from the DMS CC and the dynamic data
stored in the terminal status table (TST) gather the terminal data.

Channel configuration

When the PRLCM enters ESA mode, the C-side channel map of the
PRLCM is reconfigured to provide additional interswitch channels for ESA
call processing.
Interswitch and intraswitch channels make call connections through the
PRLCM. Call connections through the PRLCM do not involve a host
connection. The interswitch and intraswitch functionality allows call
processing to continue in ESA operation.
When the PRLCM enters ESA mode, the PRLCM channels are configured
as when all PCM30 ports except 0 and 1 are equipped. Primary ports 0 and
1 must be equipped in PRLCM ESA.
The reconfiguration of C-side channels on ESA entry makes additional
interswitch channels available for unit-to-unit calls. Refer to the following
table for a list of the channel breakdown in PRLCM ESA.
297–8351–550 Standard 04.01 August 1999