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CDM-625 Advanced Satellite Modem
Clock Modes and Drop and Insert (D&I)
LOCAL END
USER
EQUIPMENT
SD
TT
RD
RT
ST
A
O
2048 or
1544 KHz
G.703 input (T1/E1)
CDM-625
CDM-570/570L
from high stability
network source
Tx timing mode:
Internal clock locked to G.703
Rx:
Buffer enabled, clocked from ST
SD
Mod
TT
Rx
Demod
Buffer
Notes:
1) The EIA-530 / v.35 interface can
operate at any data rate, with
1 bps resolution
Any desired
bit rate
2) Tx and Rx bit rates can be
Clock
Synth
asymmetrical
Core
3) Works with multiple distant end
modems (STAR networks)
Figure 9-7. G.703 Clock Extension Mode 1
Timing mode:
Usually loop timing (or Rx-Sat)
Rx buffer disabled
END RESULT:
The G.703 signal at
at
, regardless of the link data rate
B
9–12
MN-0000036 (Ref MN/CDM625.IOM)
DISTANT END
RD
Demod
RT
ST
TT
SD
Clock
Synth
Core
2048 or
1544 KHz
G.703 output (T1/E1)
CDM-625
(all ones pattern)
CDM-570/570L
A
is perfectly reproduced
Revision 1
USER
EQUIPMENT
B
O
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