Avaya X330WAN manual USP Loopback

Using Loopbacks

Note: If the loopback troubleshooting procedure involves using PPP sessions (for example, using ICMP over PPP), disable the PPP “Keep Alive” option using the no keepalive command. This is necessary since the PPP keep alive shuts down the PPP session if it discovers a loop after about 50 seconds.

The X330W-2USP supports the following loopback type:

•USP Loopback - X330W-2USP (V.35 and EIA530A protocols only) sends the remote peer module a request to create a loop through its Line Framer. A loopback signal is used to indicate the request. The USP Loopback is illustrated in Figure 5.6.

Figure 5.6 USP Loopback

X330WAN

CPU

Tx

Rx

Line

Framer

Line Framer

DCE

Use the loopback command from the Serial interface context to instruct X330W-2USP to perform a loopback. For more information about this command, see Chapter 6: X330WAN CLI Commands.

Avaya X330WAN User’s Guide 85