ElectricalLoop limit2 kΩ maximum at 48 VDC (nominal 20 mA minimum loop current)DC resistanceTalk mode300Ω typicalMonitor impedance39kΩ nominal at 1 kHzRotary dial outputPulsing rate10pps+0.8ppsPercent break61%±2%Interdigit interval1000 ms typicalLeakage during break>50 kΩDTMF outputTone frequency error±1.2% maximumTone level-8±2dBm combined(typical)High versus low tone difference4 dB maximumMemory dialingMemory capacity12 memories plus last number redialingDigit capacity16 digits per memoryPBX pause duration4 secondsMonitor amplifier power source9V transistor; provides 25 hours continuous use, typicalSpeaker levelsLow, medium, highAutomatic power shut offAfter 5 min. of no audio signalSpeaker phone levelsLow, medium highPower sourceShared line and battery powerPhysicalLength10-1/4 inches(26.0 cm)Width2-3/4 inches(7.0 cm)Height3-1/2 inches(8.90 cm)Weight560 g typicalEnvironmentalTemperatureOperating:0 to 50˚C
Storage:-40 to 66˚CAltitude relative humidityTo 10,000 feet 5 to 95%