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External Channel Unit
front edge of the card. The JP10 REM setting is used when loop timing is supported by
software on the M&C and will be included in the front panel menu.
Three fault outputs are provided on dry contact Form C relays. These are the COMMON
EQUIPMENT, MODULATOR, and DEMODULATOR faults. They are available on the
FAULT connector on the modem rear panel. Generation of these fault conditions is
described in Section 3.1.5. Fault indicators are also provided on TTL open collector
drivers on the V.35 connector. The TTL MOD fault indicates a MODULATOR fault or
COMMON EQUIPMENT fault, while the TTL DEMOD fault indicates a DEMOD or
COMMON EQUIPMENT fault.
Table C-3 lists the jumper settings for the V.35 interface. These jumpers are factory set
for a specific configuration. Clock selections, signal selections and loop timing can be
changed upon individual needs.
JP1
JP2
JP3
JP8
JP4
JP5
JP6
JP7
JP9
JP10
JP11
JP12
JP13
JP14
JP15
JP16
*Indicates Factory jumper settings for V.35 interface type.
C-C–18
Table C-3 AS/0627-2 Rev E Board Jumper Selection
TX Clock Select
Interface Select
RX Data
RX Clock
Address Set
Address Set
Address Set
Address Set
CTS to RTS
Loop Timing
Asyn Clk Syn (-5)
SCT
RD
RR
DM
SD
SDM-309B Satellite Modem
Normal
Invert
Auto*
V.35 (-2)*
Normal*
Buffer
Normal*
Buffer
1*
0*
1*
1*
V.35 (-2)
V.35* (Processor controller for V.35 &
RS232)
Auto
On
Off*
Cut Shorts
1 to 2 Invert
2 to 3 Normal*
1 to 2 Invert
2 to 3 Normal*
1 to 2 Invert
2 to 3 Normal*
1 to 2 Invert
2 to 3 Normal*
1 to 2 Invert
2 to 3 Normal*
MN/U-SDM309B Rev. #
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