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M&C and Interfaces
UNBALANCED DDI
BALANCED DDI
UNBALANCED DDO
BALANCED DDO
UNBALANCED IDI
BALANCED IDI
UNBALANCED IDO
BALANCED IDO
UNBALANCED EXC
BALANCED EXC
LOOPBACK
NORMAL
DCE
DTE
4-4–42
-1-
-2-
CLOSED
OPEN
-5-
-6-
CLOSED
OPEN
-1-
-2-
CLOSED
OPEN
-5-
-6-
CLOSED
OPEN
-1-
-2-
CLOSED
OPEN
Drop Data Output/Insert Input
SWITCH POSITION - UP
SWITCH POSITION - DOWN
Drop Data Output Dce/Dte Select
SWITCH POSITION - UP
SWITCH POSITION - DOWN
Table 4-3
Switch 1
Switch Position
-3-
CLOSED
OPEN
Switch Position
-7-
CLOSED
OPEN
Switch 2
Switch Position
-3-
CLOSED
OPEN
Switch Position
-7-
CLOSED
OPEN
Switch 3
Switch Position
-3-
OPEN
CLOSED
Switch 4
Switch 5
SDM-309B Satellite Modem
-4-
OPEN
OPEN
CLOSED
CLOSED
-8-
OPEN
OPEN
CLOSED
CLOSED
-4-
OPEN
OPEN
CLOSED
CLOSED
-8-
OPEN
OPEN
CLOSED
CLOSED
-4-
CLOSED
OPEN
OPEN
CLOSED
MN/U-SDM309B Rev. #
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