Comtech EF Data SDM-9000, Installation And Operation Manual

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SDM-9000 Satellite Modem Installation
Rev. 4 2–9
2.4.8 DATA I/O (ESC) Interface (J8)
The DATA I/O (ESC) connection is a 50-pin female D connector located on the rear
panel of the modem. Screw locks are provided for mechanical security of the mating
connector.
The J8 connector is used to interface data input/output and ESC signals to and from the
modem. The configuration of J8 depends on the following interface types:
• G.703
• ECL
• PECL
• MIL-STD-188
The DATA I/O pinout will be different for each of the interface configurations. The
interface pinouts are listed in the following sections. Refer to the following Notes for
additional data applying to each condition.
Notes:
1. Backward alarm relay contacts named for normal no-fault condition
(BWOx–C connected to BWOx–NC if no fault).
2. Backward alarm inputs must be grounded or pulled logic low to clear alarm.
3. Signals MF, DF, and DMA are open-collector high-impedance, if faulted. MF
and DF are used by M:N protection switch, if used in redundant system.
4. Relay contacts DF–C and DF–NO named for faulted condition (DF–C connected
to DF–NO unless Demod fault).