Comtech EF Data CDM-570A Installation And Operation Manual page 562

F.5.2 Clock Extension Mode 2
Figure F-4 shows Clock Extension Mode 2. This is for situations where clock extension needs to
be performed, but there is no local G.703 reference. In this case, the local modem now operates
in an EXTERNAL clock mode and the accuracy of the TX Clock is determined solely by the
accuracy of the equipment connected to the modem.
At the distant end, an E1 or T1 synchronizing signal is generated regardless of the link data rate,
as in Mode 1.
F.5.3 Clock Extension Mode 3
Figure F-5 shows Clock Extension Mode 3. This is very similar to Mode 1 but now, instead of the
EIA-530/V.35 serial interface being used, everything is based around the 10/100 Base T Ethernet
interface.
At the distant end, an E1 or T1 synchronizing signal is generated regardless of the link data rate,
as in Mode 1
.
Clocking Modes
CDM-570A/570AL Satellite Modem with Optional Packet Processor
F–8
Revision 5
MN-CDM570A