Extreme Networks WM-4T1i manual 5Remote line loopback mode, 6Remote payload loopback mode

Monitoring T1 Physical Link

The remote line mode reflects the received signal back to the near-end. The remote payload mode reflects the data and regenerates the framing information back to the near-end.

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

WM-4T1i Module Installation and User Guide 2-9