AT&T 1040 - Manual (Page 64)

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Appendix I
Technical specification
Operating temperature 32°F — 122°F
0°C — 50°C
Power adapter input AC120V 60Hz
Power adapter
output DC12V 500mA
Backup battery
(purchased separately) Alkaline 9V, size 1604A
Headset jack 2.5mm, 32 - 150ohm
Wiring limitation No more than 600 feet
REN
0.3B
System signal carrier
frequency 1.7 MHz