Toshiba Strata AirLink DK40i, Installation And Maintenance Manual

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T1
Loop Back Testing
Strata DK I&M 6/00
8-15
T1
Notes
●
P1 and P2 to On position (see Figure 8-2 ).
●
Unplug RDTU from DK back plane.
●
CSU or Network T1 equipment should receive its own transmitted signal.
●
Indications and results depend on CSU and/or Network equipment.
Figure 8-9 Network/CSU T1 Span Test
Network/CSU/RDTU Span Test
This test checks all equipment that is checked with the test in the above paragraph, but this test
also checks that the RDTU Mitel LSI chip is functioning. Guidelines for this test are described in
Figures 8-8 ~ 8-11 .
Note
Loop back tests with CSU and Network equipment can also be performed when
connecting the RDTU PCB directly to a customer premise (PBX, Key Hybrid, Channel
bank) T1 circuit.
The RDTU Self Test is an active test of the RDTU circuit.
The Network/CSU Test checks all cables, the Network and CSU equipment (RDTU is not active).
The Remote Loop Back (RLB) Test is an Active test of RDTU (LSI MM8976B), CSU, Network
equipment and all cables.
Refer to Figure 8-2 and the CSU manufacturer’s Installation and Maintenance manual for
information on CSU Local/Network Loopback Tests.
Network/CSU Check
Loop
Back
P1
Network
Interface
Unit
CSU
NDTU Cable
P2
On On
P26, TT
P1, TR
P27, RT
P2, RR
Network
1672