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2-12 WAN Module Installation and User Guide

Configuring the WAN Physical Link

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

XM_015

Local WAN Port Remote WAN Port

Framer

Data in

Data out

Data in

Framer

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Extreme Networks WM-4T1i Guía de usuario Pagina 28