Specifications

M&C and Interfaces SDM-309B Satellite Modem
4-4–36 MN/U-SDM309B Rev. #
4.2.2.10.1 Drop Data Input, Insert Data Output, and Ext. Ref Clk (J1)
The Drop Data Input, Insert Data Output, and External Reference Clock balanced signals
are provided on a 15 pin “D” female connector accessible from the front of the break-out
panel. Screw locks are provided for mechanical security of the mating connector.
Signal Function Name Pin Number
GROUND GND 2, 4
INSERT DATA OUT IDO-A
IDO-B
3
11
EXTERNAL CLOCK EXC-A
EXC-B
7
8
DROP DATA INPUT DDI-A
DDI-B
1
9
Note: The balanced insert data output signals on J1 are selected by SW2. The balanced
drop data input signals on J1 are selected by SW1. The balanced External Clock signals
on J1 are selected by SW3. Refer to Section 4.2.2.11 for further rear panel switch
information.
4.2.2.10.2 Drop Data Output (J2)
The balanced Drop Data Output signals are provided on a 15 pin “D” female connector
accessible from the front of the breakout panel. Screw locks are provided for mechanical
security of the mating connector.
Signal Function Name Pin Number
GROUND GND 2, 4
DROP DATA OUTPUT DDO-A
DDO-B
1
9
DROP DATA OUTPUT DDO-A
DDO-B
3
11
Note: The drop data output signals are connected to SW5 which selects DTE or DCE
operation. Refer to Section 4.2.2.11.7 for further information on SW5. The balanced
drop data output signals on J2 are selected by SW1. Refer to Section 4.2.2.11.2 for
further balanced drop data output selection.
4.2.2.10.3 Insert Data Input (J3)
The balanced Insert Data Input is provided on a 15 pin “D” female connector assessable
from the front panel of the breakout panel. Screw locks are provided for mechanical
security of the mating connector.
Signal Function Name Pin Number
GROUND GND 2, 4
INSERT DATA INPUT IDI-A
IDI-B
3
11