Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-06-13
1989-12-12
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
370 1, 455600, H04B 900
Patent
active
048873098
ABSTRACT:
The present invention relates to optical repeaters in a two-way optical line link, e.g. one included in a teletransmission system. The optical repeaters are implemented such as to provide a system which, inter alia in fault localizing, utilizes the line link transmission capacity optimally by completely optical through-connection of signals on the optical fibre cables. In fault localizing, one repeater at a time is checked, by an end terminal in the link transmitting a test signal including an address for selecting a repeater for testing and a test pattern. An optical amplifier amplifies the test signal in every repeater through which the signal passes, and when it reaches the repeater indicated by the address, a control circuit controls an optical switch such that the test signal is switched (loop connected) and is returned to the transmitting terminal where fault analysis takes place.
REFERENCES:
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4266183 (1981-05-01), Steensma et al.
patent: 4278850 (1981-07-01), Sato et al.
patent: 4300239 (1981-11-01), Wakabayashi et al.
patent: 4369523 (1983-01-01), Seki et al.
patent: 4660973 (1987-04-01), Mannschke
patent: 4783851 (1988-11-01), Inov et al.
Andersson Ove B.
Berg Johan
Granestrand Per O.
Vatsel Armand
Beek L. Van
Griffin Robert L.
Telefonaktiebolaget L M Ericsson
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