Nortel 15000 用户指南

Monitoring and Troubleshooting

302768-C Rev 00

6-9

 

OAM alarm notification tells the IP protocol that the PVC has received an OAM 
alarm and that the service record is down. By default, OAM alarm notification is 
disabled; that is, OAM alarms are ignored and no message is sent to the 
upper-layer protocol. You can enable and disable OAM alarm notification at any 
time.

To enable OAM alarm notification for a PVC, navigate to the PVC prompt (for 
example,

 or 

) and enter:

For example, the following command enables OAM alarm notification on
PVC 11/1/0/32:

pvc/11/1/0/32#

 oam-notification enabled

pvc/11/1/0/32#

To disable OAM alarm notification for a PVC, navigate to the PVC prompt and 
enter:

For example, the following command disables OAM alarm notification on
PVC 11/1/0/32:

pvc/11/1/0/32#

 oam-notification disabled

pvc/11/1/0/32#

You can use fractional loopback to isolate problems with FT1 connections. 
Fractional loopback is the transmission of ANSI-standard 127-octet loop code 
through a fractional T1 (FT1) link to a device that returns the code to the sender. 
The Versalar 15000 detects and generates FT1 loopback codes as specified in 
ANSI T1.403 Annex B.

 You can perform loopback testing on a T3 interface, T1 channel, FT1 

interface, or a logical line.