363-205-401
RT Turn Up:
Issue 7, March 1997
Page 1 of 2
NTP-005
Test Digital Line Connections to DDM-2000,
DDM-1000, or DDM-Plus For Preservice RT
(Optional)
Overview:
This procedure is used to verify the connection between the RT channel back LIUs
and the DDM-2000, DDM-1000, or DDM-Plus multiplexer low speed interface packs.
A DDM-Plus or T1 repeater shelf may be used to provide a T1 extension facility
between the multiplexer and the RT channel bank. The RT must be equipped and the
ADU optioned for preservice before doing this procedure. When the RT is in
preservice, the LIUs will transmit a DS1/T1 signal toward the connecting equipment,
but will ignore the received DS1/T1 signal from the connecting equipment. When the
protectors for the DS1/T1 facility are installed and all facility interface are optioned for
the same line coding (B8ZS or AMI/ZCS), the RT-to-multiplexer connection can be
verified by removing the RT LIU and checking for loss of DS1 signal at the
multiplexer. The DDM-2000, DDM-1000, and DDM-Plus can be optioned NOT to
activate alarms when an incoming signal is bad.
1.
Verify the RT channel bank has been turned up in a preservice
state.
2.
Install digital line protectors as required (at RT, Multiplexer, T1
repeater shelf,...).
3.
Verify the multiplexer (DDM-2000, DDM-1000, or DDM-Plus opti-
cal mode) and T1 extension facility (DDM-Plus repeater mode or
T1 repeater shelf, if used) have been turned up and tested
End-to-End using the documentation for the type of equipment
used.
4.
Add DS1 ports to the multiplexer (option switch settings or
SET-STATE-T1 and SET-T1 command for the DDM-2000 multi-
plexer; SET-DSX-CODE command for the DDM-1000 multiplexer)
with the line coding optioned the same as the RT LIUs.