5.7 C-CPU Board (05P0729)/C-IF Board (05P0730)
5-45
HOOK signal
OFF HOOK signal is generated when the handset is off-hook. With OFF HOOK signal;
1) DSC AUTO ACK function does not work.
2) “Occupied Another Controller” message appears on the other control unit. No.1
control unit can be used with this message, but No.2 control unit cannot.
KEY signal
Not used.
5.7.3 Handset
The standard handset for FS-1570/FS-2570 is a condenser microphone HS-2001 with
amplifiers which amplify –43 dBm/2 kΩ signal to –10 dBm/600 Ω. SP signal of –10
dBm/600 Ω is also amplified to 2.5 mW/150 Ω.
Hall IC, U5 detects Hook signal.
Fig.5.7.3 Block diagram of Handset, HS-2001
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