Figure 10-4. G.703 Clock Extension Mode 2 - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Clocking Modes
LOCAL END
USER
EQUIPMENT
SD
TT*
RT
RD
* TT assumed to be
derived from a high
stability source
CDM-570/570L
Tx timing mode:
External clock
Rx timing:
Not important
Notes:
1) The modems can be set to any
desired data rate, with 1 bps
resolution
2) Asymmetrical loop timing
supported at distant end

Figure 10-4. G.703 Clock Extension Mode 2

10–9
DISTANT END
Demod
RT
Clock
Synth
Core
2048 or
1544 KHz
CDM-570/570L
Timing mode:
Usually loop timing (or Rx-Sat)
END RESULT:
The G.703 signal at A is generated with
the same accuracy as TT at the local end
Revision 12
MN/CDM570L.IOM
USER
EQUIPMENT
SD
TT
ST*
RD
RT
*ST optional
A
O
G.703 output (T1/E1)
(all ones pattern)