Monitoring T1 Physical Link
The remote line mode reflects the received signal back to the
Local T1 Port
Data in
Data out
Framer
Figure 2-5: Remote line loopback mode
Remote T1 Port
Framer
Data out
Data in
XM_014
Remote Line Loopback Mode. When the local port is enabled for remote line loopback mode, it sends a request to the remote end to enter the equivalent of network line loopback mode. The signal transmitted to the remote end will be retransmitted as received back to the local end.
Note: If the line is configured to use the ATT FDL standard, the remote end must be configured to detect inband loopback requests for the remote end to enter remote line loopback mode.
Data in
Data out
Local T1 Port
Framer
Remote T1 Port
Framer
Data out
Data in
XM_015
Figure 2-6: Remote payload loopback mode
Remote Payload Loopback Mode. When the local port is enabled for remote payload loopback mode, it sends a request to the remote end to enter the equivalent of network payload loopback mode. When the remote end enters loopback mode, the framer at the