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M/T-DIG (Maintenance/Test Digital Port) [G3iV1-1.286,
G3iV2-386]
Issue 4 May 2002 10-1145 555-233-123
M/T-DIG (Maintenance/Test Digital
Port) [G3iV1-1.286, G3iV2-386]
The Maintenance/Test Digital Port is a port on the TN771D (or later vintage)
Maintenance/Test circuit pack, which is required for G3iV1.1-286 or G3iV2-386.
Ports 2 and 3 are Digital Ports. The Maintenance/Test Digital Port provides the
ability to perform digital (that is, 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 10-76
on page 10-1146 .
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 (DS1ISDN Trunk) Maintenance documentation for more
information on 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.
MO Name (in
Alarm Log)
Alarm
Level
Initial Command to
Run
1
1 Where P is the port network number (1 for PPN, 2 or, 3 for EPN-1 and 3 for EPN-2); C
is the carrier designation (A, B, C, D, or E); SS is the address of the slot in the carrier
where the circuit pack is located (01, 02, ..., etc.); and pp is the 2-digit port number (for
example, 01).
Full Name of MO
M/T-DIG Minor test port PCSSpp l Maintenance/Test Digital Port
M/T-DIG Warning release port PCSSpp Maintenance/Test Digital Port