Panasonic KX-TEA308NE, Service Manual

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10.1.14. OGM Circuit
The 4M Serial Flash ROM is connected to CPU by the memory controller in DSP (in CPU).
A maximum of 3-minute storing of OGM is possible to a serial flash ROM.
10.1.15. Ring Signal Generator Circuit
This section generates the ring signal for the single line telephone. A 20/25Hz square wave is generated by the CPU timer and sent
to low pass filter and the Ring signal is amplified by BELL amplifier circuit, and then passed it through the ringing signal switching
relay to the single line telephone.
10.1.16. SMDR Interface Circuit
This is the RS232C interface port. When the port is connected to a printer. The port can be used to output the SMDR feature
recording messages and the contents of the system program.
10.1.17. Door Phone Interface
An doorphone card interface consists of two intercom paths connected to a crossing point, and address data and CS signals.
10.1.18. Call ID Interface
A CALLID card interface consists of three CALLID signal lines from outside line, and address data and CS signal.
10.1.19. BV Interface
BV card interface consists of two BV telephone call paths connected to a crossing point, and address data and CS signals.
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KX-TEA308NE