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8.7. 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 by the RING terminal in HIC, and this
information is transmitted to the HOOK terminal (Example: 3-pin IC200A) as Make=L/Break=H
signal. This digital signal is received by CODEC IC (Example: 35-pin IC201) and recognized as
dialing signal. Both 10pps and 20pps can be received. The dialing speed is analyzed by software.
8.8. HOOK DETECTION
The off-hook status is detected when the telephone is off-hook. The off-hook status is detected
when the telephone is off-hook.When a telephone is off-hook, change in voltage is detected by
the RING terminal in HIC, and this information is transmitted to the HOOK terminal (Example: 9-
pin IC200A) as OFF-HOOK=L/ON HOOK=H signal. This digital signal is received by CODEC IC
(Example: 35-pin IC201) and recognized as off-hook signal. The off-hook status is analyzed by
software.
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