Extreme Networks WM-4T1i Guide de l'utilisateur télécharger pdf (Page 26)

2-10 WAN Module Installation and User Guide

Configuring the WAN Physical Link

Local Loopback Mode. When the local port is enabled for local loopback, the local

data stream goes into the framer and the framing bits are inserted into the data, but the

data is not transmitted to the remote end. Instead, it is sent back through the local

framer, the framing bits are discarded, and the original data is returned. This mode tests

the local end.

Figure 2-3: Network line loopback mode

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.

Figure 2-4: Network payload loopback mode

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.

XM_012

Remote WAN PortLocal WAN Port

Framer

Data in

Data out

Data in

Framer

XM_013

Remote WAN PortLocal WAN Port

Framer

Data in

Data out

Data in

Framer

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Extreme Networks WM-4T1i Guide de l'utilisateur Page 26