Switch subtending in a synchronous transmission system
US7013348B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2001 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Feb 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0623
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention concerns a switching apparatus comprising a low order switch subtended from a high order switch. In order to compensate for delays incurred by passing a data frame through the high order switch to the low order switch and delays incurred by the operation of the low order switch, the apparatus is arranged to advance the payload of a received data frame with respect to the fixed overhead of the data frame by an amount corresponding to the incurred delays. The low order switch uses the advanced payload to create an output frame, for sending to the high order switch, which is advanced with respect to the data frame that it receives. The apparatus, which is particularly suitable for use in SDH and/or SONET systems, obviates the need to provide an alignment apparatus, such as a VT/TU aligner between the high order switch and the subtended low order switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.