for failure detection.

The voice signal is compressed and filtered into the 300 to 4000 Hz range, and this audio frequency is mixed with the carrier frequency. The carrier frequency is again filtered, amplified and transmitted. The transmission power of these HF carrier frequencies will be in the range of 0 to +32 dbW. This range is set according to the distance between substations.

PLCC can be used for interconnecting private branch exchanges

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