Data transmission system of key telephone system

Details Data transmission system of key telephone system Data transmission system of key telephone system

1987-03-23

1988-03-15

Ng, Jin F.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

371 5, 371 37, 375 17, H03M 700

Patent

active

047318201

ABSTRACT:
Disclosed is a system for transmitting data by a data pulse train obtained by a combination of "0" or "1" bit pulse signals through a pair of lines connected beween a main unit and a key telephone set. The system includes a counter for sampling the pulse train and counting "0" or "1" bit pulse signals; a comparator for comparing a count of the counter with a reference value; and a correcting section for adding "0" or "1" correction pulses so as to set the count to be the reference value when the count is different from the reference value.

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