Yes, but does FDL run over the per channel robbed bit signalling or does it run over the T-1 signaling. i.e. Does FDL run using ESF (applies to the whole T-1) or does it run on the robbed bit signaling for specific channels?
FDL is carried in some surplus bits within the ESF frame, not within the payload. Follow this link for a good article describing T1/E1s.
http://www.commsdesign.com/showArticle.jhtml?articleID=16501900
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