Monitor system for multiplex equipment
US4987568A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 1988 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Apr 8, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A monitor system for a multiplex equipment is disclosed, in which a multiplexer and a demultiplexer are monitored by direct comparison of input and output signals thereof. Low-bit-rate output interfaces and high-bit-rate output interfaces include signal-loss detectors respectively. Low-bit-rates input interfaces and high-bit-rate input interfaces, on the other hand, include signal-loss detectors or frame alignment-loss detectors and selectors for loop outputs of the output interfaces of respective speeds back upon the input sides of the input interfaces of respective speeds. An economical monitor circuit for detecting a fault of a multiplex converter and accurately is thus configured without using any bipolar signal switching circuit or low- or high-bit-rate B/U converters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.