4RF Aprisa XE User Manual - page 121
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Configuring the traffic interfaces | 120
DCE to DCE Mode 4: RxC (X.21) - No overhead (internal clocking)
DCE clocks
used
Clock passing
Comment
RxC
RxC is derived from the terminal
clock.
Suggested for X.21 Cloud Configuration.
Single clock X.21 system.
DCE to DCE Mode 5: XTxC
→ RxC - 40 kbit/s overhead (Pass-through clocking)
DCE clocks
used
Clock passing
Comment
RxC, TxC,
XTxC
XTxC is transported to RxC and TxC in
both directions