A method and arrangement for minimizing skew

H - Electricity – 04 – L

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H04L 1/22 (2006.01) H04B 1/74 (2006.01) H04L 1/02 (2006.01)

Patent

CA 2243975

At a signal transmission rate of 1 Gb/s, the "bit time" is 1 ns. This corresponds to a bit length in an optical fibre of 0.2 m. In view of the fact that skew shall not exceed one-tenth of a bit length, this means that length differences between different conductors in a transmission line may not exceed 2 cm. With the intention of minimizing the skew that would thus otherwise occur in a transmission line, the transmission line (1) and its conductors (2) have been joined three and three to form a ribbon cable or flat cable where the length difference (5) between different conductors (2) in the transmission line does not exceed 2 cm. By providing transmission lines, such as rolled-up flat ribbon cables for instance, which have been previously cut to precise and appropriate lengths, such as lengths of 10, 20, 30 m for instance, with a largest length deviation between different conductors of ~1 cm, skew can be minimized when using the cables.

A une vitesse de transmission de signaux de 1 Gb/s, la "cadence binaire" est d'1 ns, ce qui correspond, dans la fibre optique, à une longueur binaire de l'ordre de 0,2 m. Etant donné que l'asymétrie ne doit pas dépasser un dixième d'une longueur binaire, ceci signifie que des différences de longueur entre plusieurs conducteurs d'une ligne de transmission ne peuvent excéder 2 cm. Dans le but de minimiser l'asymétrie, laquelle ne manque pas de se produire dans une ligne de transmission (1), on a formé cette ligne (1) en réunissant trois par trois les conducteurs (2) de celle-ci, afin de former un câble de type ruban ou câble plat, dans lequel les différences de longueur (5) entre lesdits conducteurs (2) de la ligne de transmission n'excèdent pas 2 cm. Lors de l'utilisation des câbles, on minimise l'asymétrie en faisant en sorte que des lignes de transmission, telles que par exemple des câbles de type ruban, plats, enroulés, et préalablement coupés aux longueurs précises et appropriées, comme par exemple des longueurs de 10, 20 ou 30 m, présentent, entre les différents conducteurs, une variation dimensionnelle maximale de longueur de l'ordre de ±1 cm.

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