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Chapter 6. Diagnostics
6-2 MX2800 STS-1 User Manual 61200659L1-1
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-D
ATA
M
ODE
to end a test in progress.
Figure 6-2. VT/Port Diagnostics Menu
Tributary
A
T
RIBUTARY
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.