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APPENDIX A
PATTON MODEL 2450 SPECIFICATIONS
DDS Type: Dedicated
Transmission Format: Synchronous, full duplex
Maximum Operating
Distance: 18000 feet (3.4 miles) over 26 AWG twisted
pair
DTE Interface: RS-232 (DB-25 female), RS-422/530 (DB-
25 female), V.35 (M/34 female or DB-25
female)
DDS Line Interface: RJ-48S jack
Standards: AT&T 62310 compliant
DDS Line Rates: 56 and 64 Kbps
DTE Rates: 56 and 64 Kbps
Transmission Line: 4-wire
Applications: DDS, point-to-point or multipoint; Clear
Channel, point-to-point; campus-area point-
to-point
Indicators: LED indicators for TD, RD, CD, No Signal,
Error and Test Mode
Diagnostics: V.54 compliant local and remote loopback
tests; V.52 compliant 511/511E BER test
Power Supply: 120 VAC, 60 Hz or 230 VAC, 50 Hz to 10
VAC, 1A wall mount transformer
Dimensions: (RS-232 version) 1.65”H x 4.18”W x 3.55”D;
(V.35 version w/ screws) 1.65”H x 4.18”W x
3.96”D
APPENDIX B
CABLE RECOMMENDATIONS
The following statements apply to the Model 2450 when used as a
short range modem over private twisted pair:
All Patton Electronics Company Short Range Modems (SRMs) are
tested to the distances published in our Catalogs and Specification
Sheets on twisted-pair cable with the following characteristics:
Wire Gauge Capacitance Resistance
19 AWG 83nF/mi or 15.72 pF/ft. .0163Ω/ft.
22 AWG 83nF/mi or 15.72 pF/ft. .0326Ω/ft.
24 AWG 83nF/mi or 15.72 pF/ft. .05165Ω/ft.
26 AWG 83nF/mi or 15.72 pF/ft. .08235Ω/ft.
We fully expect that the Short Range Modems will operate on lines
with specifications different from those tested, but to reduce the
potential difficulties in the field, one should ensure that the cable being
used has similar or better characteristics (lower capacitance or lower
resistance).
Wire with capacitance of 20pF/ft. or less is suitable for all our Short
Range Modems . However, distances may vary from those published in
our catalog. Variations in wire resistance will also affect distance but
not functionality. Wire should be 26 AWG or larger (smaller AWG#).
Patton products are designed to withstand normal environmental
noise and conditions however, other environmental factors too
numerous to discuss in this format may affect proper operation of the
SRM’s.
Selection of the proper SRM for an application is critical to
maintaining Customer Satisfaction and should be taken seriously.
Certain models are better suited for particular applications and
environments than others.
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