Nortel DMS-100 Series Maintenance Manual page 22

1-10 Maintenance overview
The terminal access connector provides low-level debug monitor access to
monitor the operation on the LCM processor software. This function is a
debugging tool only and the information provided through this port is raw
data pulled directly from operating software memory areas. This port should
be accessed by Nortel personnel only.
Interfaces
This section describes the following NT6X51BA interfaces:
External interfaces The NT6X51BA LCM processor has electrical
connections with the following hardware elements in the RLCM-EDC
remote peripheral interfaces:
Internal LCM wiring interfaces do not change with the implementation of
the NT6X51BA LCM processor. Likewise, RLCM-EDC peripheral module
cabinet wiring does not change because of the implementation of the EDC
feature hardware.
Internal interfaces A shared memory buffer is used between the MP and
each of the of the two front end processors for interprocessor message
packet exchanges.
Inter-unit communication (IUC) link interface The IUC is a bidirectional
serial data communication link between the two NT6X51BA LCM
processors that send and receive information to and from the mate unit. In
addition to the two serial data signals, each processor provides activity status
to its mate processor. This link also sends and receives load records to and
from the mate unit (mate loading and updating).
297-8381-550 Standard 02.02 April 1999
external
internal
inter-unit communication link
the mate NT6X51BA LCM processor pack through the IUC link and
operational status signals
the NT6X52 DCC, through a parallel processor bus
the NT6X53 power supply, which provides operational status signals and
relay multiplex control signals for the ringing bus multiplexer on the
power supply pack
each NT6X54 BIC in the line drawers: a LCM processor activity status
signal and a RCON / TCON serial message link
external debug monitor terminal devices providing RS—232 TXD and
RXD signals with asynchronous character transmission rates of 9600
bit/s