Signal transmit-receive device, circuit, and loopback test method
US7216269B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2002 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Sep 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/243
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A signal transmit-receive device of the invention reduces the number of high-speed signal lines required for connecting a transmitting circuit group and a receiving circuit group, and for running a loopback test on a signal transmit-receive device. The loopback test circuit uses an error detecting circuit, a test signal producing circuit, and a wiring for transmitting error information. The error detecting circuit compares a test signal pattern defined in advance by a first communication device and a received signal pattern. The test signal producing circuit produces the test signal pattern based on error information. If an error is detected, the error signal is transmitted to the test signal producing circuit through the wiring. The test signal producing circuit produces a predetermined test signal pattern if the error signal DE has an L level; upon receiving H level, it sends back the predetermined test signal pattern to the first communication device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.