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Can someone explain in detail a yellow alarm or RAI in E1 or T1?
giritharan 09-January-2008 12:07:25 PM

Comments


In general it indicates the user-network interface
loss.
Posted by HamidAliKhan


Yes It basically indicates the user-network interface
loss.
Posted by waqqas1


RAI: Acronym of Remote Alarm Indication also called Loss of Frame Alignment

It basically indicates the user-network interface
loss.
Posted by sagitraz


YELLOW: remote alarm indication (RAI): The RAI (remote alarm indication) signal indicates loss of layer 1 capability at the user-network interface. RAI propagates towards the network if layer 1 capability is lost in the direction of the user, and RAI propagates toward the user if layer 1 capability is lost in the direction of the network. The transmission of Loss of Frame Alignment (LFA) – also called Remote Alarm Indication (RAI) – and idle data link sequence in m-bits is mandatory. The other use of m-bits is optional, but when a function other than mandatory functions is used, the specification described here should be applied to guarantee the interworking of terminals.
Posted by colinrankin

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