Interface (J5); External Reference Clock (J6); G.703 Interface (J); Send Data (J7) - Comtech EF Data SDM-309B Installation And Operation Manual

SDM-309B Satellite Modem
The engineering service channel is provided on a 25 pin "D" female connector assessable
from the front panel of the breakout panel. Screw locks are provided for mechanical
security of the mating connector.
GROUND
TRANSMIT DATA
RECEIVE DATA
REQUEST TO
SEND/CLEAR TO SEND
TERRESTRIAL ESC DATA
SET READY
Note: RTS and CTS are looped together on the connector.
4.2.1.9.5 G.703 Interface (J5)
The G.703 interface is provided on a 15 pin female "D" connector and is located on the
front of the break-out panel. Screw locks are provided for mechanical security of the
mating connector.
GROUND
RECEIVE DATA
SEND DATA
EXTERNAL CLOCK

4.2.1.9.6 External Reference Clock (J6)

This connector is the interface for the unbalanced external reference clock input. To
activate this connector, SW1 must be in the UNBAL position. If the balanced external
reference clock input is to be used SW1, must be in the BAL position. Switch 1 is
located on the front panel to the right of the external reference clock input.

4.2.1.9.7 Send Data (J7)

This connector is the interface for the unbalanced Send Data input. To activate this
connector SW2 must be in the UNBAL position. If the balanced Send Data input is to be
used, SW2 must be in the BAL position. Switch 2 is located on the front panel to the
right of the send data input.
MN/U-SDM309B Rev. #
Signal Function
GND
TXD
RXD
RTS/CTS
TER_ESC_DSR
Signal Function
GND
T1E1_RD-A
T1E1_RD-B
T1E1_SD-A
T1E1_SD-B
EXC-A
EXC-B
Name Pin Number
1, 7
2
3
4
5
6
Name Pin Number
2, 4
3
11
1
9
7
8
M&C and Interfaces
4-4–21