Remote return loop control in a data transmission system

Details Remote return loop control in a data transmission system Remote return loop control in a data transmission system

1982-07-14

1985-07-16

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 15, 1791753R, 375 10, H04M 1100, H04Q 900

Patent

active

045299790

ABSTRACT:
In a return loop control system in a data transmission system having data transmission units such as modems connected at opposite ends of a transmission line, a return loop being formed at one of the data transmission units by a command signal from the other data transmission unit when the transmission line, modulator, demodulator, etc. are to be tested. Where a data to be transmitted is sent out a predetermined time period later than the send-out of a signal for establishing a communication status to the transmission line, a command signal for forming a return loop is sent out within the predetermined time period.

REFERENCES:
patent: 3743938 (1973-07-01), Davis
patent: 4064459 (1977-12-01), Markwitz et al.
patent: 4271513 (1981-06-01), Maejima et al.
patent: 4402075 (1983-08-01), Bargeton
patent: 4425662 (1984-01-01), Jeandot

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