Chapter 6. Diagnostics

VT/PORT LOOPBACKS

After you select the number that corresponds with the line you want to test, the menu in Figure 6-2 appears. The number selected (1-28) refers to the VT number. The Port (T1/E1) that will be tested is the port mapped to the selected VT number. The sections following the figure provide descriptions and illustrations of the testing options. Select 1-DATAMODE to end a test in progress.

Figure 6-2. VT/Port Diagnostics Menu

Tributary

A TRIBUTARY loopback loops the selected VT/Port back to the network (STS-1). The T1/E1 is looped back through the STS-1 mapper. During this loopback, the corresponding DSX-1/E1 input is overwritten by the outgoing DSX-1/E1 signal. See Figure 6-3 on page 6-3 for an illustration of this test.

6-2

MX2800 STS-1 User Manual

61200659L1-1

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ADTRAN 4200659L2, 4200659L1, 4175043L2, 4200659L5, 4200659L8, 4200659L7, 4200659L3, 4200659L6 VT/PORT Loopbacks, Tributary

1200287L1, 1200291L1, 1200657L2, 4200659L4, 4200659L6 specifications

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