Panasonic KX-TD500 Installation Manual page 36

1.6 Specifications
Power Unit Functions
1.
Power supply (+5.9 VDC, ±15 VDC, GND) for a shelf.
2.
External battery interface. (±12 V)
Battery power (±12 V) is input from KX-A46 (Battery Backup Adaptor) with a 4-wire
cable.
3.
Power failure detection.
A circuit in power unit detects power failures of +5.9 VDC, ±15 VDC, AC Voltage, and 3
power alarm signals are sent to CPU card as DC alarm, AC alarm and Heat alarm.
4.
Generation of bell signal. (25 Hz, 75 Vrms)
CPU Card Functions
1.
Call process and basic shelf main protocol. (Microprocessor 80386EX).
Time switch (TSW) control, detection of system clock alarm, basic shelf power down and
expansion shelf power down alarm, watchdog timer overflow.
2.
System switch interface.
There are Operation Switch (MODE) (10 modes, 0 to 9) and System Switch (SYSTEM) (10
modes, 0 to 9) on the CPU rotary switch.
3.
Terminal interface.
CPU card has two RS-232C terminal interfaces.
CPU Card Operation
1.
Operation Switch (MODE) and System Switch (SYSTEM) are set by turning with
screwdriver.
2.
Reset switch is non-lock push switch.
3.
LED for battery alarm lights when voltage of Lithium-battery becomes too low (less than
2.5V).
4.
LED for watchdog lights when the software is running away.
TSW Card Functions
1.
Time switch.
Capability of switching voice is 768ch
2.
Generation of call progress tones.
Call progress tones are dial tone, busy tone, reorder tone and ringback tone.
3.
Conference circuit.
TSW card has 3-party
4.
Paging interface.
TSW card has 2 pre-amplifier circuits for paging. In order to adjust volume, each amplifier
circuit is equipped with a knob.
5.
Music-in interface.
TSW card has 2 interface circuits for music on hold or BGM.
36
768ch.
8 conference's circuits.
System Outline