Method and arrangement for minimizing skew
US6008455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1997 |
| Grant date | Dec 28, 1999 |
| Priority date | — |
| Expiry date | Jan 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
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 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. By conductor is primarily meant an optical fiber, although other conductors such as coaxial conductors or twin wire conductors are conceivable. Since the three fibres are seated together along the major part of their lengths, they can be readily laid in an inst…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.