Network/Csu/Rdtu Span Test - Toshiba STRATA CTX100 Installation And Maintenance Manual

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 6-4
information on CSU Local/Network Loopback Tests.
RDTU
RDTU TX Open
MITEL Chip
P4
MM8976B
0
Top LED
0
0
0
0
0
Bottom LED
0
Figure 6-10 Network/CSU/RDTU Span Test
Strata CTX I&M 10/02
and the CSU manufacturer's Installation and Maintenance manual for
RDTU Amphenol Pin Nos.
P1/P26 Transmit
P2/P27 Receive
LEDS ON RDTU PCB
Busy ON Steady
FALM ON
FMALM OFF
YALM OFF
BALM OFF
T1 T2
Primary SYNC ON or OFF, Steady
Secondary SYNC ON or OFF, Steady
NDTU Cable
Network
Interface
CSU
Unit (NIU)
OFF OFF OFF ON
ON OFF OFF OFF
OFF ON OFF OFF
OFF OFF ON OFF
T3 T4 T5 T6
Loop Back Testing
Network
2581
Continue to Cycle when
P4 is in ON Position
T = About 1/2 Second
1673
T1
6-11