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On the T1.5 interface, what is the difference between AT&Ts Extended Superframe Facility Data Link (ESF FDL) protocol and the ANSI version?

April 26, 2017Data ESF extended facility interface link superframe

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On the T1.5 interface, what is the difference between AT&Ts Extended Superframe Facility Data Link (ESF FDL) protocol and the ANSI version?

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AT&T created and implemented the first ESF FDL protocol named after the defining Technical Reference, TR54016. The AT&T protocol uses a command/response arrangement with the Customer Installation (CI) such as an ESF CSU, Multiplexer or PBX. ANSI defines the ESF FDL protocol in their DS-1 specification, T1.403. The ANSI protocol requires the CI to generate Performance Report Messages (PRMs) at one-second intervals. The advantage of ANSI T1.403 over AT&T TR54016 is the monitoring equipment in the network can be non-intrusive, increasing circuit reliability. TR54016 and ANSI T1.403 conform to ITU Q.921 and can coexist on the same 4Kb/s ESF FDL. AT&T supports equipment conforming to both TR54016 and ANSI T1.403. It is recommended that new CI support both TR54016 and ANSI T1.403.