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Chapter 6. Diagnostics
6-4 T3SU 300 User Manual 61200217L1-1
Figure 6-3. DS3 Payload Loopback Test
Line Loopback
This test allows the loop interface (LINE) section of the local
T3SU 300 to be tested from the remote T3SU 300 over the actual T3
circuit. Testing from the remote end of the circuit is performed by
using a 511 test pattern or DTE data generated by the remote host.
With this test, the T3SU 300 transceiver receives data from the
network and loops it back toward the network through its
transmitter. The transmitted data is identical to the receive data
(including framing errors) and can therefore be accurately tested by
the carrier for errors. See Figure 6-4.
Figure 6-4. Line Loopback Test
DTE
T3SU 300
The Line Loopback test is only available in loop timed mode
(
C
ONFIGURATION
->
DS3
N
ETWORK
->
DS3
T
IMING
->
L
OOP
).
DTE
T3SU 300