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.
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