10 MDS 4710B/9710B I/O Guide MDS 05-3316A01, Rev. E
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2.6 Data Interface Connections
The transceiver’s DATA INTERFACE connector is used to connect the
transceiver to an external DTE data terminal that supports the
RS-232-type format. The transceiver supports asynchronous data rates
of up to 9600 bps, depending on the radio’s modem setting. (See
Table 4.) The data interface speed may differ from the data rate used
over the air.
If synchronous data transmission is required, an external synchro-
nous-to-asynchronous converter is required. Contact MDS for addi-
tional information.
Table 5 lists each pin on the
DATA INTERFACE connector and describes its
function.
Table 3. Length vs. loss in coaxial cables at 900 MHz
Cable Type
10 Feet
(3.05 Meters)
50 Feet
(15.24 Meters)
100 Feet
(30.48 Meters)
500 Feet
(152.4 Meters)
RG-8A/U 0.85 dB 4.27 dB 8.54 dB 42.70 dB
1/2 inch HELIAX
0.23 dB 1.15 dB 2.29 dB 11.45 dB
7/8 inch HELIAX
0.13 dB 0.64 dB 1.28 dB 6.40 dB
1 1/4 inch HELIAX
0.10 dB 0.48 dB 0.95 dB 4.75 dB
1 5/8 inch HELIAX
0.08 dB 0.40 dB 0.80 dB 4.00 dB
Table 4. Modem type versus speed
Modem Type Data Speeds Supported
1200 bps (Bell) Up to 1200 bps
4800 bps Up to 4800 bps
9600 bps 9600 bps
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