4RF Aprisa XE User Manual - page 118
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Configuring the traffic interfaces | 117
DTE to DCE Mode 3: RxC (X.21) - 40 kbit/s overhead (Pass-through clocking)
DTE
clocks
used
DCE
clocks
used
Clock passing
Comment
RxC
RxC
40 kbit/s of overhead used to
transport RxC from the DTE to
DCE.
Preferred option for X.21.
DTE to DCE Mode 5: RxC
→ RxC - 40 kbit/s overhead (Pass-through clocking)
DTE
clocks
used
DCE
clocks
used
Clock passing
Comment
RxC and
TxC
RxC and
TxC
40 kbit/s of overhead used to
transfer RxC from the DTE to
the DCE RxC and TxC.
Receiver derived clock system.