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SDM-309B Satellite Modem
DROP DATA OUTPUT
TERRESTRIAL TX DATA
TERRESTRIAL RX DATA
INSERT DATA INPUT
PRIMARY COMMON
PRIMARY NORMALLY OPEN
PRIMARY NORMALLY CLOSED
SECONDARY COMMON
SECONDARY NORMALLY OPEN
SECONDARY NORMALLY CLOSED
DATA SET READY
4.2.2.11 Rear Panel Switches
Switch 1 through switch 3 are used to select signals through the BNC connectors or the
DB15 connectors. Switch 4 is used to select normal or loopback conditions. Switch 5 is
used to select DCE or DTE Drop Data Output pin selection. Figure 4-13 shows the
layout of the rear panel switches. Table 4-3 describes their function. Figure 4-14 and
Figure 4-15 is the schematic diagram for the breakout panel.
4.2.2.11.1 Drop Data Input
The drop data input signal has two input sources. The BNC connector has the
unbalanced input signal and the DB15 connector has the balanced input signal. To use
the BNC connector input, SW1 position 1 & 2 must be closed (close to PCB) and SW1
position 3 & 4 must be open (away from PCB). To use the DB15 connector input, SW1
position 1 & 2 must be open and SW1 position 3 & 4 must be closed. The switch pack is
located on the rear of the breakout panel.
4.2.2.11.2 Drop Data Output
The drop data output signal has two outputs. The BNC connector has the unbalanced
output signal and the DB15 connector has the balanced output signal. To use the BNC
connector output, SW1 position 5 & 6 must be closed (close to PCB) and SW1 position 7
& 8 must be open (away from PCB). To use the DB15 connector output, SW1 position 5
& 6 must be open and SW1 position 7 & 8 must be closed.
4.2.2.11.3 Insert Data Input
The insert data input signal has two input sources. The BNC connector has the
unbalanced input signal and the DB15 connector has the balanced input signal. To use
the BNC connector input, SW2 position 1 & 2 must be closed (close to PCB) and SW2
position 3 & 4 must be open (away from PCB). To use the DB15 connector input, SW2
position 1 & 2 must be open and SW2 position 3 & 4 must be closed.
MN/U-SDM309B Rev. #
M&C and Interfaces
DDO-A
37
DDO-B
38
TER_TXDAT
5
TER_RXDAT
7
IDI-A
39
IDI-B
40
PRI_COM
10
PRI_NO
43
PRI_NC
27
SEC_COM
11
SEC_NO
44
SEC_NC
28
DSR
48
4-4–39
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