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I think in short BLUE: alarm indication signal (AIS): The AIS (alarm indication signal) is used to indicate loss of layer 1 capability in the ET-to-TE direction on the network side of the user-network interface. A characteristic of AIS is that its presence indicates that the timing provided to the TE may not be the network clock. AIS is non-framed and coded as all binary ONEs

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Posted by HamidAliKhan

Yes AIS basically indicates the User-Network.

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Posted by waqqas1

AIS basically indicates the User-Network
interface loss in ET-to-TE direction on network.

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Posted by sagitraz

BLUE: alarm indication signal (AIS): The AIS (alarm indication signal) is used to indicate loss of layer 1 capability in the ET-to-TE direction on the network side of the user-network interface. A characteristic of AIS is that its presence indicates that the timing provided to the TE may not be the network clock. AIS is non-framed and coded as all binary ONEs

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Posted by vance