4RF Aprisa XE User Manual page 146

144 | Configuring the Traffic Interfaces
DCE to DCE Mode 4: RxC (X.21) - No overhead (internal clocking)
DCE clocks
used
RxC RxC is derived from the terminal
clock.
DCE to DCE Mode 5: XTxC
DCE clocks
used
RxC, TxC,
XTxC
Clock passing
RxC - 40 kbit/s overhead (Pass-through clocking)
Clock passing
Aprisa XE User Manual
Comment
Suggested for X.21 Cloud Configuration.
Single clock X.21 system.
Comment
XTxC is transported to RxC and TxC in
both directions