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Diagnostics
Payload Loopback Test and Line Loop Test
A T3 Payload Loopback commands the DSU to loop the received T3 signal back to the remote after
the network framer circuit. The remote site is responsible for test pattern generation and checking.
Payload loopback tests everything on the network side up to and including the unit. It re-generates
framing and corrects bipolar violations.
A T3 Line Loop commands the DSU to loop the received T3 signal back to the remote at the
network interface. The remote site is responsible for test pattern generation and checking. See
Figure.
Note
Remote units cannot place master units in test.
Figure 4-3
Figure 4-4
4-4
SC800 T3 DSU
DTE
INTERFACE
Payload Loopback Test
SC800 T3 DSU
DTE
INTERFACE
Line Loopback Test
SpectraComm 800 T3 Data Service Unit
Installation and Operation Manual
Diagnostics Overview
NETWORK INTERFACE
Tx DRIVER
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ANALOG
RECEIVER
NETWORK INTERFACE
Tx DRIVER
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ANALOG
RECEIVER
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076R160-000
Issue 4
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