Read Panasonic KX-TDA0177XJ / KX-TDA0177X (serv.man2) Service Manual online
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KX-TDA0177XJ / KX-TDA0177X
5.2.14. Bell Signal Transmission
AC 75Vrms bell signal generated onboard is transmitted to the individual port, then control the bell ON/OFF by making a bell relay
in each port (Bell signal ON) and by breaking it (Bell signal OFF).
The 16 ports do not ring simultaneously. They are divided into 4 layers to control ON/OFF. They are divided in to following 4 groups
(The ports in the same group ring simultaneously.): "1, 5, 9, 13", "2, 6, 10, 14", "3, 7, 11, 15" and "4, 8, 12, 16".
in each port (Bell signal ON) and by breaking it (Bell signal OFF).
The 16 ports do not ring simultaneously. They are divided into 4 layers to control ON/OFF. They are divided in to following 4 groups
(The ports in the same group ring simultaneously.): "1, 5, 9, 13", "2, 6, 10, 14", "3, 7, 11, 15" and "4, 8, 12, 16".
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