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LOS basically indicates the loss in the signal
amplitude.

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Posted by crouse

RED or Loss of signal (LOS) in E1 or T1 is basically indicates the loss in the signal amplitude.

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Posted by HamidAliKhan

Yes sagitraz is right.

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Posted by waqqas1

LOS basically indicates the loss in the signal
amplitude.

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Posted by sagitraz

RED: Loss of signal (LOS): The equipment shall assume "loss of signal" when the incoming signal amplitude is, for a time duration of at least 1 ms, more than 20 dB below the nominal amplitude. The equipment shall react within 12 ms by issuing AIS.

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Posted by bretpark