Diagnostics and Troubleshooting 6-11
6
(This feature in not available on the VX Encore.)
Figure 6-4 Loop Payload Test
The Loop Up Remote Test
The Loop Up Remote test puts the remote DSU/CSU into Network Loopback using the
industry standard set codes. Once in Loop Up Remote, test patterns can be sent to
verify the Bit Error Rate (BER) performance of the bidirectional T1 network signal.
To put the remote DSU/CSU into network loopback, the local DSU/CSU momentarily
transmits the industry standard loop up code to the remote DSU/CSU. If the remote
DSU/CSU does not go into network loopback within 15 seconds, a failure is declared
and the DSU/CSU stops sending the loop up code.
The loop code and network parameters for the local and remote DSU/CSUs must
match.
S
DSU
CSU
Data
Port
Network
Interface
Remote DSU/CSU
DTE
CSU
DSU
Data
Ports
Data
Ports
Local
multi-port DSU/CSU
DTE
DTE
DTE
DTE
DTE
AUX
Port
PBX
Network
Interface
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