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Data Mode
Ends a test already in progress for this port.
DS3 Payload Loopback
During this test, all payload information is re-framed and looped
back towards the network. See Figure 6-3 for a block diagram
illustrating the loopback point and the signal paths for this test.
This test does not interrupt data flow from the network to the DTE, but it
does block all DTE-to-network data.
DTE
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.
The Line Loopback test is only available in loop timed mode
( C
61200217L1-1
-> DS3 N
ONFIGURATION
T3SU 300 User Manual
T3SU 300
Figure 6-3. DS3 Payload Loopback Test
-> DS3 T
ETWORK
IMING
Chapter 6. Diagnostics
-> L
).
OOP
6-3
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