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CHAPTER
19-1
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
19
Configuring Link Noise Monitoring
About Link Noise Monitoring
Link Noise Monitoring (LNM) feature monitors noise associated with T1/E1 communication links
between a base transceiver station (BTS) and the aggregation node (AN).
T1/E1 links are leased spans (lines) from service providers. Noise in these lines causes data loss.
Significant data loss affects the voice quality. When notified of such issues the system operator can move
the faulty span out of service.
The LNM feature monitors link noise by determining whether the error parameter associated with the
selected link has exceeded its predefined threshold.
The LNM feature is described in the following sections:
• Feature History of Link Noise Monitoring, page 19-1
• Restrictions for Link Noise Monitoring, page 19-1
• Configuration Tasks for Link Noise Monitoring, page 19-2
• Verification Example for Link Noise Monitoring, page 19-5
Feature History of Link Noise Monitoring
Restrictions for Link Noise Monitoring
The LNM feature has the following restrictions and limitations:
Cisco IOS Release Description Required PRE
12.2(33)XNE This feature was introduced on the Cisco
10000 series router for the following line
cards.
• 1-port Channelized OC-12 line card
• 4-port Channelized OC-3/STM-1 line
card
• 2-port Channelized OC-12 shared port
adapter (SPA)
PRE3 and PRE4