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CDM-625 Advanced Satellite Modem
Clock Modes and Drop and Insert (D&I)
LOCAL END
USER
EQUIPMENT
SD
TT*
RT
RD
* TT assumed to be
derived from a high
stability source
CDM-625
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 9-8. G.703 Clock Extension Mode 2
9–13
MN-0000036 (Ref MN/CDM625.IOM)
DISTANT END
Demod
RT
Clock
Synth
Core
2048 or
1544 KHz
CDM-625
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 1
USER
EQUIPMENT
SD
TT
ST*
RD
RT
*ST optional
A
O
G.703 output (T1/E1)
(all ones pattern)
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