Nortel 15000 用户指南
Managing and Troubleshooting the Versalar Switch Router 15000
6-10
302768-C Rev 00
FT1 loopback detection allows remote test equipment to conduct loopback testing
on an FT1 channel or logical line without affecting other logical lines. By default,
loopback detection is enabled.
on an FT1 channel or logical line without affecting other logical lines. By default,
loopback detection is enabled.
We recommend that you perform loopback testing in the following order:
1.
Test the DS3 interface.
2.
If there are no errors, test the DS1 interface.
3.
If the DS1 test results are OK, test the logical line.
The following sections describe how to perform loopback detection and testing.
Enabling or Disabling Loopback Detection
The accept-loopback-request parameter for a T1 or FT1 channel determines
whether the software accepts remote requests to go into loopback mode.
whether the software accepts remote requests to go into loopback mode.
To enable or disable the acceptance of loop-up and loop-down requests from a
remote device, go to the T1 or FT1 prompt and enter:
remote device, go to the T1 or FT1 prompt and enter:
accept-loopback request {enabled
|
disabled}
enabled
(the default setting) allows loopback testing to occur so that the T1 or
FT1 interface accepts remote requests to go into loopback mode. This option is
the default setting.
the default setting.
disabled
prevents loopback testing from occurring.
To prevent slot 2, connector 1, T1 channel 4 from accepting remote loop-up and
loop-down requests, enter:
loop-down requests, enter:
t1/2/1/4#
accept-loopback-request disabled
t1/2/1/4#
Note:
The clear channel T3 access service tests the DS3 interface only.