APPENDIX A
PATTON MODEL 222N SPECIFICATIONS
Date Rates:
19,200 bps (according to the RS-
232 interface)
Transmission Format:
Asynchronous
Transmission Mode:
Full/half duplex
Power:
AC power not required, derives
approximately 3mA from RS-232
data and control voltages
Surge Protection:
Compliant with IEC 801.5 level 2,
1kV (Model 222NS Only)
Factory Switch Setting:
DCE; data is received from the
remote short range modem via
RX+ and RX-, and is sent to the
DTE from the Model 222N via pin 3
of the RS-232 interface; (the RS-
232 interface is the DB-25
connector closest to the DTE/DCE
switch).
Dimensions:
2.20" x 1.75" x .75"
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APPENDIX B
PATTON MODEL 222N CABLE RECOMMENDATIONS
The Patton Model 222N operates at frequencies of 20kHz or less
and has been performance tested by Patton technicians using twisted-
pair cable with the following characteristics:
Wire Gauge
Capacitance
Resistance
19 AWG/.9mm
83nf/mi or 15.72 pf/ft.
.0163 Ohms/ft.
22 AWG/.6mm
83nf/mi or 15.72 pf/ft.
.0326 Ohms/ft.
24 AWG/.5mm
83nf/mi or 15.72 pf/ft.
.05165 Ohms/ft.
To gain optimum performance from the Model 222N, please keep
the following guidelines in mind:
•
Always use
twisted pair
wire—this is not an option.
• Use twisted pair wire with a capacitance of 20pf/ft or less.
• Avoid twisted pair wire thinner than 26 AWG (i.e. avoid higher
AWG numbers than 26)
• Use of twisted pair with a resistance greater than the above
specifications may cause a reduction in maximum distance
obtainable. Functionality should not be affected.
• Environmental factors too numerous to mention can affect the
maximum distances obtainable at a particular site. Use “maximum
distance” figures as a
general guideline only
.
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