Multiplex unit with means for responding to signal loss in one or more channels
US4302839A · kind A · utility
6Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Oct 9, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/073
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multiplex unit for multiplexing plesiochronous digital signals has a monitoring device for signalling the loss of input signals on one or more channels being multiplexed. Upon recognition of a lost signal in one or more channels, an alarm indication signal is substituted for the information signals in that channel and a synthetic justification signal is produced which replaces the justification information in such channel. The synthetic justification information gives the alarm indication signal the correct pulse repetition rate in the outgoing channel of the multiplex unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.