Path protection switch ring system for line saving even though line setting operation was not carried out
US5790520A · kind A · utility
11Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Oct 29, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J2203/006
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A path protection switch ring system has a working line, a protection line, and a plurality of add/drop multiplexers. The add/drop multiplexer has a path-switch unit, an unequipped signal detection unit, and a path-switch control unit. The path-switch unit is used to switch between the working line and the protection line. The unequipped signal detection unit is used to detect an unequipped signal which is output when line setting has not been carried out. The path-switch control unit is used to control the switching operation of the path-switch unit when the unequipped signal is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.