Asynchronous-to-synchronous data concentration system

Details Asynchronous-to-synchronous data concentration system Asynchronous-to-synchronous data concentration system

1976-11-08

1977-09-13

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

178 531R, 179 15AF, H04L 700

Patent

active

040484408

ABSTRACT:
Asynchronous character-oriented (start-stop) data are transmitted through a synchronous transmission channel at a rate which can exceed the synchronous rate. The excess data rate is accomplished in an input buffer at the transmitter by suppressing occasional stop bits in proportion to the difference between synchronous and asynchronous rates. An output buffer at the receiver detects start bits and thereafter monitors the presence or absence of stop bits. When a stop bit is absent, the output buffer restores it before delivering the character to the data user.
Special control signals not organized into characters, such as, all-space signals are also monitored at both transmitter and receiver to insure that stop bits are not spuriously inserted.

REFERENCES:
patent: 3937882 (1976-02-01), Bingham
patent: 4002844 (1977-01-01), Doussoux

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