Lucent Technologies Release 7 manual . .

DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4 June 1999
Maintenance Object Repair Procedures
9-1109M/T-DIG (Maintenance/Test Digital Port)
9
Figure 9-66. ISDN-PRI Outgoing Test Call
Looped-back data
stream pattern is
generated by digital
port 1 and checked
by digital port 2 on
the TN771
Digital
Port 1
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TN771
Maintenance/Test
SPE
UN332
MSSNET TN1655 PKT-INT
TDM
Bus
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Control
. . . . . .
Loop-back
Circuitry
Far-End
Equipment
B-channel carries
looped-back test signal
D-Channel instructs
far end to connect
loop-back circuitry
across B-channel
signal
External DS1 Facility
PBX Equipment
TN464
DS1
Interface
Packet
Bus
Digital
Port 2