Panasonic KXTA30820 Installation Manual - Page 22

1.5.2 Characteristics Station Loop Limit KX-TA30820 / KX-TA30830 / KX-TA30850 / ...... 40 Ω Single Line Telephone ......... 600 Ω including set Doorphone 20 Ω Minimum Leakage Resistance 15 000 Ω Maximum Number of Station Instruments per Line Each extension port supports one proprietary telephone or one single line telephone. If Parallel Connection is used, the maximum number of single line devices that can be connected in parallel is just one device (one SLT, one fax, one cordless, etc.). Ring Voltage 80 Vrms at 20 Hz depending on the Ringing Load Central Office Loop Limit 1 600 Ω max. Environmental Requirements 0 °C - 40 °C {32 °F - 104 °F}, 10 % - 90 % relative humidity Hookswitch Flash Time Range 204 ms - 1 000 ms Door Opener 60 V DC, 1 A (Max) / 40 V AC, 1 A (Max)* Doorbell/Door Chime 60 V DC, 1 A (Max) / 40 V AC, 1 A (Max)* Dimensions (H×W×D) 284 mm × 368 mm × 95 mm {141/2″ × 111/8″ × 33/4″} Mass (Weight) Approx. 2.5 kg {5.6 lb} * Please make sure these values are not exceeded. 1-6 System Outline