Comtech EF Data CDM-570 - Figure 10-3. G.703 Clock Extension Mode 1

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Clocking Modes MN/CDM570L.IOM
10–8
USER
EQUIPMENT
Notes:
1) The EIA-530 / v.35 interface can
operate at any
data rate, with
1 bps resolution
2) Tx and Rx bit rates can be
asymmetrical
3) Works with multiple distant end
modems (STAR networks)
LOCAL END
DISTANT END
G.703 input (T1/E1)
from high stability
network source
EIA-530 / v.35
Interface
SD
RT
RD
TT
ST
CDM-570/570L
Rx
Buffer
Clock
Synth
Core
Demod
Mod
SD
TT
G.703 Port
2048 or
1544 KHz
O
Tx timing mode:
Internal clock locked to G.703
Rx:
Buffer enabled, clocked from ST
USER
EQUIPMENT
G.703 output (T1/E1)
(all ones pattern)
EIA-530 / v.35
Interface
RD
TT
ST
RT
CDM-570/570L
Clock
Synth
Core
Demod
G.703 Port
2048 or
1544 KHz
O
Timing mode:
Usually loop timing (or Rx-Sat)
Rx buffer disabled
SD
END RESULT:
The G.703 signal at is perfectly reproduced
at , regardless of the link data rate
A
B
B
A
Any desired
bit rate
Figure 10-3. G.703 Clock Extension Mode 1