Master/Master (Customer Clock); Master/Master (Station Clock) - Comtech EF Data SDM-309B Installation And Operation Manual

SDM-309B Satellite Modem
an exact frame length, causing minimum loss of data. By using very high stability clocks,
the expected time between slips can be many days.
Loss of the buffer clock will mean the buffer will not be emptied and no data will be
available. The buffer clock will normally revert to the low stability internal reference
automatically.

4.3.2.1 Master/Master (Customer Clock)

TX_CLOCK
BUFF_CLK
RX_CLK
EXT_REF

4.3.2.2 Master/Master (Station Clock)

Care should be taken when using this mode. Make sure that the station clock is also used
to synchronize the transmit data. Phasing problems may also occur between the transmit
data and the station clock input and for this reason, it is better to use the TERR clock on
transmit.
TX_CLOCK
BUFF_CLK
RX_CLOCK
EXT_REF
MN/U-SDM309B Rev. #
Modem Settings (Master)
TX_TERR
TX_TERR
NORMAL
N/A
Modem Settings (Master)
EXT_REF OR TX_TERR
EXT_REF OR TX_TERR
NORMAL
SET TO FREQUENCY OF STATION CLOCK.
SDM-309B
M&C and Interfaces
4-4–47