Toshiba CTX28 manual Network/CSU T1 Span Test, Network/CSU/RDTU Span Test

T1

Loop Back Testing

Network/CSU T1 Span Test

This test verifies that the far end (CSU, Network, or CPE) T1 equipment and span cabling is functioning properly. This test checks all T1 span cabling including the RDTU Amphenol cable and connector. Guidelines for this test are provided in Figure 8-11.

Network/CSU Check
Loop			NDTU Cable
Back		P26, TT
P1	P2	P1, TR	CSU
On On		P27, RT
		P2, RR

Notes

Network

Interface

Unit

Network

1672

●P1 and P2 to On position (see Figure 8-7).

●Unplug RDTU from Strata CTX back plane.

●CSU or Network T1 equipment should receive its own transmitted signal.

●Indications and results depend on CSU and/or Network equipment.

●Do not use the RDTU3A as a clock extraction unit.

Figure 8-11 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. Examples for this test are shown in Figures 8-10~8-12.

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 or DS2155), CSU, Network equipment and all cables.

8-20 Strata CTX I&M 06/04