Network/Csu/Rdtu Span Test - Toshiba Strata DK14 Installation And Maintenance Manual

Network/CSU Check
Loop
Back
P1
P2
On
On
Notes
P1 and P2 to ON position (see
Unplug RDTU from DK424 back plane.
CSU or Network T1 equipment should receive its own transmitted signal.
Indications and results depend on CSU and/or Network equipment.
Figure 6-9 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 6-8~6-10.
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 6-3
information on CSU Local/Network Loopback Tests.
Strata DK I&M 5/99
NDTU Cable
P26, TT
P1, TR
P27, RT
P2, RR
Figure 6-2).
and the CSU manufacturer's Installation and Maintenance manual for
Network
CSU
Interface
Unit
DK424 T1
Loop Back Testing
Network
1672
6-17