1200 Bps Bell 202T Modem; 4800 Bps Modem; Audio Processing Module; Order Wire Module - Microwave Data Systems MDS 4310 Installation, Operation & Field Maintenance

Division 2, hazardous locations. Please consult with the MDS Marketing Department for
further information on these models.
1200 BPS Bell 202T Modem (Internal)—P/N 03-1815A01
The internal AFSK Bell 202T compatible modem is available for low speed data
requirements. It is used at slower standard speeds (30–1200 bps) and provides compatibility
in a radio system operating with non-MDS brand analog radios. A standard RS-232 C or TTL
compatible interface is provided through the radio's (DB-25) connector.
INTERFACE
4800 BPS Modem(Internal)—P/N 03-1831A01
This intermediate speed digital FSK interface (50–4800 bps asynchronous or 4800 bps
synchronous) can be used in any MDS 4300 Series remote radio. It is compatible with MDS
4100 Series digital master station radios using this modulation technique.
A standard RS-232 or TTL compatible interface is provided through the radio's
INTERFACE
(DB-25) connector.
9600 BPS Modem (Internal)—P/N 03-1833A01
The MDS internal 9600 bit per second (bps) FSK modem provides synchronous or
asynchronous operation where high speed data exchanges are required. The modem is
compatible only with MDS 4100 Series digital master station radio systems operating at
9600 bps. Available with RS-232 or TTL interface provided through the radio's
INTERFACE
(DB-25) connector.
Audio Processing Module (Internal)—P/N 03-2301A01
The Audio Processing Module can be installed to support applications where no keying
circuits are provided by a modem or remote terminal unit (RTU). The assembly senses the
presence of a tone on the transmit audio line and keys the transmitter. The VOX assembly
provides for audio signal pre-emphasis and de-emphasis if needed. This option is mounted in
the Option 1 position on the transceiver's main board. See Appendix J.
Order Wire Module (External)—P/N 02-1297A01
The Order Wire Module option is supplied as an external device that plugs into the radio's
(DB-25) connector. It can be used with a standard four-pin modular telephone
INTERFACE
handset to provide a temporary voice link back to the master site for installation and test
purposes.
The order wire uses a voice-operated transmit (VOX) circuit to key the transmitter when the
operator speaks into the handset. Otherwise, normal operation of the remote transceiver
continues since the order wire option is installed in-line between the transceiver and the
RTU/modem. See Appendix E.
Remote Maintenance Module (Internal)—P/N 03-1958A01
With a Remote Maintenance Module installed in the Option 2 slot, three levels of diagnostics
are available—Mode 1: Local Diagnostics, Mode 2: Advanced Diagnostics, and Mode 3:
Remote Maintenance.
Continued on next page.
MDS 05-2415A01, Rev. A GENERAL 1-11