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Quantum and Evolution Series Installation and Operating Handbook
MIL-STD-188-114A Interface
The modem terrestrial interface is compliant with the interfaces defined in MIL-STD-188-
114A when set in EIA530 RS422 mode.
This MIL-STD document specifies three types of `balanced generators`:
• Type 1 Low offset voltage, for <100kbps. Defined in the 1985 document for compatibility
with older equipment.
• Type 2:3V offset maximum, for 100kbps to 10Mbps. MIL-STD-188-114A specifies this
corresponds to the EIA RS-422A balanced generators.
• Type 3:New terminated voltage generator for >10Mbps.
Strictly the modem is compliant with the Type 2 interface, defined for use from 100kbps to
10Mbps. However this interface will also operate down to 4800bps. The low offset voltage
Type 1 generator is not supported, but as specified for use with older equipment in 1985,
should not be an issue today.
The Type 3 is for data rates above 10Mbit/s – this physical interface is not currently
supported.
Connectors, pin assignments and communication protocols are not standardised in this
MIL-STD document: FED-STD-1030A may be considered equivalent to EIA RS423A and
CCITT V.10 while FED-STD-1020A may be considered equivalent to EIA RS422A and
CCITT V.11.
P3709/P3713 Eurocom D1 Interface
Two versions of Eurocom D1 card are offered.
P3709 is fully pin-for-pin compatible with Eurocom 25 way D-type plug on the P1451 card
for P300.
P3713 provides combined Eurocom D1, EIA530 and G703 balanced interfaces on the
standard EIA530 25 way D-type socket.
Although P3709 hardware supports the interface mode select pins, both cards are
configurable from the front panel or web interfaces.
10-13
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