Patton electronic 222N - Manual (Page 13)

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"
11
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
.
12