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M/T-DIG (Maintenance/Test Digital Port)
Issue 1 June 2005 1709
M/T-DIG (Maintenance/Test Digital Port)
S8700 | 8710 / S8500
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 Figure 97: ISDN-PRI Outgoing Test Call
on page 1710.
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:
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.
MO Name in
Alarm Log
Alarm
Level
Initial SAT Command to Run Full Name of MO
M/T-DIG MIN test port location l Maintenance/Test digital port
M/T-DIG WRN release port location Maintenance/Test digital port