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Loop limit: 2 KΩ maximum at 48 VDC (nominal 20 mA minimum loop current)
DC resistance
Talk Mode: 300Ω typical
Monitor impedance:39kΩ nominal at 1 KHz
Rotary dial output
Pulsing rate:10pps+0.8pps
Percent break:61%±2%
Interdigit interval:1000 ms typical
Leakage during break:>50 kΩ
DTMF output
Tone frequency error: ±1.2% maximum
Tone level: -8±2dBm combined(typical)
High versus low tone difference: 4 dB maximum
Memory dialing
Memory capacity:12 memories plus last number redialing
Digit capacity: 16 digits per memory
PBX pause duration: 4 seconds
Monitor amplifier power source: 9V transistor; provides 25 hours continuous use, typical
Speaker levels : Low, medium, high
Automatic power shut off: After 5 min. of no audio signal
Speaker phone levels: Low, medium high
Power source : Shared line and battery power
Physical
Length 10-1/4 inches(26.0 cm)
Width 2-3/4 inches(7.0 cm)
Height 3-1/2 inches(8.90 cm)
Weight 560 g typical
Environmental
Temperature: Operating:0 to 50˚C
Storage:-40 to 66˚C
Altitude relative humidity:To 10,000 feet 5 to 95%
