US 4,278,850 AGranted

Monitoring system for optical transmission line repeaters

AssigneeKokusai Denshin Denwa Kabushiki Kaisha

InventorsMasanori Sato, Yasuhiko Niiro, Hiroharu Wakabayashi

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Abstract

The error rate and the operation of repeaters inserted in an optical transmission line are monitored at the terminal station on land by transmitting the test signal and monitoring the response signal of repeaters through the optical data transmission line without utilizing interstitial copper pair. Each repeater has the particular identification code, and the transmission terminal transmits the test code having the repeater identification code and an acknowledgement block with an empty bit position on the time divisional basis with the data to be transmitted. The repeater which finds his identification code in the test code, inserts the response in the acknowledgement block, and repeats the signal including both said test code and the data to be transmitted. The reception terminal analyzes the response signal of each repeater to determine the error rate of each repeaters.

Claims8

Dependent claims

In an optical digital transmission system including a transmitting station coupled by way of a transmission line to a receiving station and at least one intermediate repeater station, the combination therewith of:

(a) optical pulse generating means at said transmitting station for establishing a test signal on a time divisional basis with the data to be transmitted, said test signal comprising an indentification code for identifying a particular repeater station and an acknowledgement block having an empty bit position,
(b) decoding means at said repeater station for decoding said identification code, said decoding means outputting an acknowledgement signal upon recognition of said identification code,
(c) delaying means at said repeater station coupled to the output of said decoding means for delaying said acknowledgement signal to achieve time coincidence with said empty bit position in said acknowledgement block, and
(d) gating means at said repeater station coupled to the outputs of said delaying means and the transmission line for combining said test and data signals with said acknowledgement signal on a time divisional basis for transmission to said receiving station.

1 more element

In an optical digital transmission system including a transmitting station coupled by way of a transmission line to a receiving station, and at least one intermediate repeater station, the combination therewith of:

(a) optical pulse generating means of said transmitting station for establishing a test signal on a time divisional basis with the data to be transmitted, said test signal comprising an identification code for identifying a particular repeater station and an acknowledgement block having an empty bit position,
(b) photoelectric conversion means at said repeater station for converting said optical signals in the transmission line into electrical signals,
(c) regenerative recognition means at said repeater station coupled to the output of said photoelectric conversion means for regenerating said test and data signals,
(d) decoding means at said repeater station coupled to the output of said photoelectric conversion means for decoding said identification code, said decoding means outputting an acknowledgement signal upon recognition of said identification code,
(e) delaying means at said repeater station coupled to the output of said decoding means for delaying said acknowledgement signal to achieve time coincidence with said empty bit position in said acknowledgement block,
(f) gating means at said repeater station coupled to the outputs of said delaying means and said regenerative recognition means for combining said test and data signals with said acknowledgement signal on a time divisional basis, and
(g) electric to photo conversion means at said repeater station coupled between the output of said gating means and the transmission line for converting electrical signals into optical signals for transmission to said receiving station.

4 more elements

Dependencies are inferred from the claim text.