Read Panasonic KX-TDA6178X / KX-TDA6178XJ Service Manual online
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KX-TDA6178X/KX-TDA6178XJ
5.2.6.
Power Supply
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V, but is switched over to -45V for ports 1-8, depending on circuit distance.
Current is set as 26mA.
Preset voltage is -26V, but is switched over to -45V for ports 1-8, depending on circuit distance.
Current is set as 26mA.
5.2.7.
Dial Pulse Detection
When a telephone initiates pulse dialing, this feature detects the pulse-dialing signal.
When the telephone initiates dialing, changes in voltage is detected in SLIC, and this information is transmitted to the ITA/ITB pin of
SLIC (27, 36pin) as Make=L/Break=H signal. This digital signal is received by CODEC IC and recognized as dialing signal. Both
10pps and 20pps can be received. The dialing speed is analyzed by software.
When the telephone initiates dialing, changes in voltage is detected in SLIC, and this information is transmitted to the ITA/ITB pin of
SLIC (27, 36pin) as Make=L/Break=H signal. This digital signal is received by CODEC IC and recognized as dialing signal. Both
10pps and 20pps can be received. The dialing speed is analyzed by software.
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