Digital transmission systems

Details Digital transmission systems Digital transmission systems

H - Electricity

04

B

325/11, 325/12,

H04B 3/36 (2006.01) H04B 10/16 (2006.01) H04B 17/02 (2006.01) H04J 3/12 (2006.01) H04L 7/027 (2006.01)

Patent

CA 1168311

ABSTRACT IMPROVEMENTS IN OR RELATING TO DIGITAL TRANSMISSION SYSTEMS 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.

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