C/R (1 bit) (Frame Relay)

Protocol: Frame Relay Frame Relay PCI

Field: command/response

Length: 1 bit

Contents: flow direction indicator.

If frames are sent by the station that initiated the current connections, the C/R bit is set to zero; the respond frame has C/R set to one:

C/R=0 ... command ,

C/R=1 ... response.

The C/R bit is necessary for frame handlers and access nodes in relation the the BECN and FECN indicator bits.