Optical transmission device

H - Electricity – 04 – B

Patent

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325/1

H04B 10/12 (2006.01) H04B 10/24 (2006.01)

Patent

CA 2000582

An optical transmission device for interconnecting an optical full duplex transmission line and a half duplex transmission line. When a start bit of a data block of an electrical signal received from the half duplex transmission line is detected, a maintaining signal to maintain the same transmission direction is generated during which the data block can be transmitted. An optical signal is received from the optical full duplex transmission line and converted into an electrical signal. Similarly, a maintaining signal to maintain the same transmission direction is generated. In response to either one of the two maintaining signals, passage or stopping of signals by a driver for sending out an electrical signal to the half duplex transmission line and a receiver for receiving an electrical signal from the half duplex transmission line are controlled. Possible interference of data is prevented and the transmission direction is changed over in this manner. Further, the level of an optical signal is monitored, and when the optical signal level becomes lower than a reference level, an abnormality warning data is transmitted succeeding to the data block.

L'invention est un dispositif de transmission optique servant à interconnecter une ligne de transmission duplex optique et une ligne de transmission semi-duplex. Quand le bit de départ d'un bloc de données faisant partie d'un signal électrique reçu de la ligne de transmission semi-duplex est détecté, un signal de maintien servant à maintenir la direction de la transmission, durant lequel le bloc de données peut être transmis, est produit. Un signal lumineux est reçu de la ligne de transmission duplex optique et est converti en un signal électrique. De même, un signal de maintien servant à maintenir la direction de transmission est produit. En réponse à l'un ou l'autre de ces deux signaux de maintien, le dispositif de l'invention contrôle le passage ou le blocage des signaux pour permettre à un émetteur de transmettre un signal électrique à la ligne de transmission semi-duplex et à un récepteur de recevoir un signal électrique de cette même ligne de transmission. Les perturbations des données sont évitées et la direction de la transmission est inversée de cette façon. De plus, le niveau des signaux lumineux est surveillé et, quand il devient inférieur à un niveau de référence donné, un signal d'anomalie est transmis après le bloc de données.

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