ATIS Telecom Glossary
Tuesday, October 21, 2014

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remote alarm indication (RAI)
A signal transmitted in the outgoing direction when a terminal determines that it has lost the incoming signal. RAI is commonly called the yellow alarm signal. For superframe (SF) operation, an RAI is transmitted by setting the bit-2 position of every channel time slot to zero. For extended superframe (ESF) operation, an RAI is transmitted by introducing a priority message codeword 1 1 1 1 1 1 1 1 00000000 (LtR) in the ESF datalink. [T1.Rpt25-1993]

 

 

 

 

 

 

 

 

 

 



 
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