Panasonic KX-TD500 Installation Manual page 36

4.
Generation of bell signal. (25Hz, 75Vrms)
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 x 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 x 8 conference's circuits.
For CO-to-CO speech amplifier AGC card can be inserted to a free slot of basic or
expansion shelf.
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.
TSW Card Operation
1.
A knob for adjusting volume of external paging is turned with a screwdriver from front of
TSW card.
2.
The LED indicator on the TSW card lights when system resets or TSW local reset occurs.
System Outline
1.6 Specifications
37