Information transmission system with modems coupled to a common communication medium
US4617656A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1986 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Jan 2, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A plurality of information processors are coupled by respective modems to a communication medium at points thereof. Transmission and reception of information signals among the modems are effected through a headed located at a predetermined point on the communication medium. A pilot signal generator is provided which sends out a pilot signal having a predetermined reference level through the headend to the communication medium. Each modem is arranged to properly adjust the gain of its transmitting amplifier according to a reception level of the pilot signal for an improvement of signal transmission quality and a reliable detection of a signal collision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.