Panasonic KX-TD500 Installation Manual page 35

1.6 Specifications
Doorphone
20 ohms
Minimum Leakage Resistance
15,000 ohms
Maximum Number of Station Instruments per Line
1 for KX-T7420, KX-T7425, KX-T7431, KX-T7433, KX-T7436, KX-T7220, KX-T7230,
KX-T7235, KX-T7250, KX-T7130, KX-T7020, KX-T7030, KX-T7050, KX-T7055 or single
line telephone
2 by Parallel or eXtra Device Port Connection of a proprietary telephone and a single line
telephone
Ring Voltage
75 Vrms at 25 Hz depending on the Ringing Load
Primary Power
120 VAC, 60 Hz, 14 A max.
Central Office Loop Limit
1,600 ohms max.
Environmental Requirements
Temperature range : 0 — 40 °C / 32 — 104 °F
Rel. Humidity :10 — 90%
Hookswitch Flash Timing Range
204 — 1,000 milliseconds
Power Unit Functions
1.
Power supply (+5.9 VDC, ±15 VDC, GND) for a shelf.
2.
External battery interface. (±12V)
Battery power (±12V) is input from KX-A46 / KX-A46D (Battery Backup Adaptor) with a
4-wire cable.
3.
Power failure detection.
A circuit in power unit detects power failures of +5.9VDC, ±15VDC, AC Voltage, and 3
power alarm signals are sent to CPU card as DC alarm, AC alarm and Heat alarm.
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System Outline