Avaya S8700 Maintenance Manual page 138

Maintenance Object Repair Procedure
M/T-DIG (Maintenance/Test Digital
Port)
MO's Name
(in Alarm
Log)
M/T-DIG
M/T-DIG
1. UU is the universal cabinet number (1–64). C is the carrier designation (A, B, C, or D). SS is the
number of the slot where the circuit pack resides (01–10). pp is the 2-digit port number (01, 02,...).
The Maintenance/Test digital port is a port on the TN771D circuit pack. Ports 2
and 3 are digital ports. The Maintenance/Test digital port provides the ability to
perform digital (i.e., ISDN-PRI) trunk testing via the TDM bus. For an ISDN-PRI
test call, connections are set up in the system as shown in
8-835.
When the Maintenance/Test digital port is participating in an ISDN-PRI test call,
the port sends a stream of pseudo-random data along the connected B channel.
The far end loops back this data, and the Maintenance/Test digital port compares
the data to that which was sent. Errors are recorded on a bit and block basis.
Refer to ISDN-TRK (DS1 ISDN Trunk) Maintenance documentation for more
information about ISDN-PRI test calls.
The Maintenance/Test digital port maintenance ensures that the digital trunk
testing function is operating correctly. The Maintenance/Test digital port is
alarmed if maintenance determines that the digital port is operating incorrectly.
NOTE:
An alarm on the Maintenance/Test digital port reduces service, but does not
block it since the ISDN-TRK has other means to determine the health of the
ISDN-PRI trunk facility. However, to accurately measure the error
performance and to ensure accuracy of the health of the ISDN-PRI trunk,
the Maintenance/Test circuit pack should be replaced when a new circuit
pack is available.
8-834 Issue 1 May 2002
Alarm
Level Initial Command to Run
MINOR test port UUCSSpp l
WARNING release port UUCSSpp
1
Full Name of MO
Maintenance/Test digital
port
Maintenance/Test digital
port
Figure 8-27 on page
555-233-142