Extreme Networks WM-4T1i manual Far-End Loopback Modes

Configuring the T1 Physical Link

Local T1 Port

Data in

Data out

Framer

Figure 2-3:Network line loopback mode

Remote T1 Port

Framer

Data out

Data in

XM_012

Network Line Loopback Mode. When the local port is enabled for network line loopback mode, the received signal is sent back to the remote end without reframing the data. This mode primarily tests the integrity of the line from the remote side.

Local T1 Port

Data in

Data out

Framer

Figure 2-4:Network payload loopback mode

Remote T1 Port

Framer

Data out

Data in

XM_013

Network Payload Loopback Mode. When the local port is enabled for network payload mode, the framer removes the framing bits from the received signal and recovers the transmitted data. This same data is then reframed and transmitted back to the remote end. This mode tests the line and the local circuitry from the remote side.

Far-End Loopback Modes

The far-end of the link can be enabled for the following two loopback modes:

•Remote Line

•Remote Payload

2-8 WM-4T1i Module Installation and User Guide