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11.5. POWER FAILURE THROUGH CALL SWITCHING CIRCUIT
11.5.1. Circuit operation
If an AC power failure lasts longer than one second (momentary power failure), the COL is directly connected to the extension.
The COL1 will be connected with EXT101.
11.6. DATA COMMUNICATION CIRCUIT
11.6.1. Composition
This circuit is composed of the ASIC and the data communication interface circuits for the ICM circuit.
11.6.2. Circuit Operation
1) Data Communication of CPU (IC700)
The APT i/f module is built into CPU.
An RX/TX couple signal is shared by eight APT communications; this communicates via the selection signal.
That is, in the APT i/f module, extension 1-8 port switch the port communicates every 4ms respectively with
#101→#102→#103→#104..... →#108→#101.....
When the extension is not connected with APT, it is recognized as an SLT connection and the dummy communication is
established.
Interface block diagram of CPU and ICM
29
KX-TEA308NE
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