Telephonic communications – Multi-line or key substation system with selective switching... – Switching or supervision feature
Patent
1989-06-27
1991-01-15
Schreyer, Stafford D.
Telephonic communications
Multi-line or key substation system with selective switching...
Switching or supervision feature
H04M 100
Patent
active
049859153
ABSTRACT:
There is disclosed a data interfacing method in a key-phone system and a subset key-phone system capable of speedily processing an event generated from a key-phone system by use of two data interfacing sections between the key-phone system and subset key-phone. The invention to increase the data interfacing speed includes: a first step for reading a state data of data received from a data receiver 43 and checking whether said received data is effective; a second step for reading the data from said data receiver 43 when the received data in said first step is effective, thereafter checking whether it is null data. If it is null data the system returns to said first step; a third step for processing the read data when it is not null data in said second step and sequentially outputting the first and second processed data to a data transmitter means 45, thereby ending the process; and a fourth step for outputting an error message to the key-phone when a parity error is generated in said first step and, then, ending the process.
REFERENCES:
patent: 4551583 (1985-11-01), Sekiguchi et al.
Bushnell Robert E.
Samsung Electronics Co,. Ltd.
Schreyer Stafford D.
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