Comtech EF Data CDM-570 - Figure 10-5. G.703 Clock Extension Mode 3

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Clocking Modes MN/CDM570L.IOM
10–10
Notes:
1) The IP interface can be set to
any desired data rate, with 1 bps
resolution
2) Tx and Rx rates can be
asymmetrical
LOCAL END
DISTANT END
G.703 input (T1/E1)
from high stability
network source
IP Interface
CDM-570/570L
Clock
Synth
Core
Demod
Mod
CLK
DATA
G.703 Port
2048 or
1544 KHz
O
Tx timing mode:
Internal clock, locked to
external G.703
Rx:
Buffer disabled
G.703 output (T1/E1)
(all ones pattern)
IP Interface
CDM-570/570L
G.703 Port
O
Timing mode:
Rx buffer disabled
END RESULT:
The G.703 signal at is perfectly reproduced
at , regardless of the exact link data rate
A
B
B
A
Any desired
data rate
CLK
DATA
(HDLC)
Rx clock at desired link data rate
Clock
Synth
Core
Demod
Mod
RT
2048 or
1544 KHz
RD
(HDLC)
ETHERNET ETHERNET
Figure 10-5. G.703 Clock Extension Mode 3