4RF Aprisa XE User Manual page 142

140 | Configuring the Traffic Interfaces
HSS Clocking DTE to DCE 'Pipe Mode'
DTE to DCE Mode 2: RxC + TxC - 56 kbit/s overhead (Pass-through clocking)
DTE DCE
clocks clocks
used used
RxC and RxC and
TxC TxC
Clock passing
56 kbit/s of overhead is used to
transport RxC and TxC from HSS
DTE to HSS DCE.
Aprisa XE User Manual
Comment
This is the preferred dual external
clock system.
Both clocks travel in the same
direction from DTE to DCE. This
mode is used when it is important
that the externally supplied RxC and
TxC are maintained independently.
This is almost only required in
cascaded (that is, multi-link)
networks.
This mode cannot be used in
conjunction with any interface
conversion to / from X.21.