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Using Loopbacks
Avaya X330WAN User’s Guide 85
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
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.
X330WAN
CPU
Line
Framer
Tx
Rx
DCE
Line
Framer