Digital data transmission system having frequency or phase modul

Details Digital data transmission system having frequency or phase modul Digital data transmission system having frequency or phase modul

1981-06-08

1983-07-12

Robinson, Thomas A.

H04B 346

Patent

active

043932797

ABSTRACT:
A supervisory channel is provided on a digital transmission system by frequency modulation of the data signal transmitted along a transmission link which includes repeaters. The frequency modulation can be carried out using an elastic store. Each repeater includes means for demodulating the frequency modulation so that each repeater can be addressed and interrogated. Each repeater can also phase modulate the data signals on the return link to a terminal station so that signals indicative of an interrogated condition can be transmitted to the terminal station.

REFERENCES:
patent: 3392242 (1968-07-01), Smith et al.
patent: 3916120 (1975-10-01), Morris
patent: 4079203 (1978-03-01), Dragoo
patent: 4122358 (1978-10-01), Altmann
"3A-RDS 11 GHz Digital Radio System," by A. J. Giger & T. L. Osborne, pp. 18-1 through 18-7.
"A 120 Mb/s Digital Transmission System on Coaxial Cable" by P. J. Wakeling, Point to Point Communications, Jan. 18, 1974, No. 1, pp. 18-29.
"800 MHx S.A.W. Timing Filter for Optical Fibre Transmission System" by J. Minowa and K. Nakagawa, Electronics Letters, Jan. 3, 1980, vol. 16, No. 1.

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