Frame Relay Physical Layer Options and Frame Formats
IT Toolbox
FEBRUARY 11, 2017
In addition to these guidelines, the UNI IA acknowledges that other interfaces, such as ISDN, may be used as appropriate. For example, MCI currently offers frame relay as a switched digital service at 56/64 Kpbs, and also as a fractional T1 service, Nx56 or Nx64 Kpbs.
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