Portable testing device for monitoring communication line activity
US4665521A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Jan 25, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY04S40/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
This invention relates to a portable testing device which is used in a system having a host terminal, a plurality of secondary terminals, and a communication line interconnecting the host and secondary terminals for in-house communication. The transmission line includes a transmit line pair, a receive line pair, and a ground line. The testing device is operated in one of three modes which are selected via a switch on the device. The three modes of operation are: PA0 (1) Monitoring the transmit lines from the host and secondary terminals; PA0 (2) Performing "turn-around" functions with the host or secondary terminals; and PA0 (3) Performing "turn-around and load testing" with the host or secondary terminals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.