Enabling Loopback Mode; Disabling Loopback Mode - Extreme Networks WM-4T1i WAN Installation And User Manual

Configuring the WAN Physical Link
Local WAN Port Remote WAN Port
Data out
Data in
Data in
Data out
Framer Framer
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
remote end removes the framing bits from the received signal and recovers the
transmitted data. This same data is then reframed and transmitted back to the local end.

Enabling Loopback Mode

To enable a local loopback mode, use one of the following commands:
enable ports <portlist> [t1 | e1 |t3] loopback [local | network line]
enable ports <portlist> t1 loopback network payload
To enable a remote loopback mode, use one of the following commands:
enable ports <portlist> t1 loopback remote [line | payload]
enable ports <portlist> t3 loopback remote line

Disabling Loopback Mode

Use the following command to return the near and remote side of a T1, E1 or T3 link
from loopback mode to normal mode:
disable ports <portlist> [t1 | e1 | t3] loopback
You can also use the following command to return the remote T1 or T3 port to normal
function from loopback mode:
enable ports <portlist> [t1 | t3] loopback remote loopdown
2-12 WAN Module Installation and User Guide