It is funny that Cisco uses M13 muxing on their non-channelized cards, yet
they use 'M23' muxing on their channelized cards. As was suggested, the CSU
chip used determines whether it is single or two-stage interleaved to form
the DS3 signal.
chris
>Cbit is used when you want to use inband signaling for things like network
>management, similar to the Facility Data Link (FDL) of the T1. It is a
>21-bit field. Cbit is part of the M13 frame, which is like the T1 frame,
>except it is called an M frame. The "13" represents a DS1 to DS3
>multiplexer, hence M13.
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