System and method for transmission-line termination by signal cancellation, and applications thereof
US6937056B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2001 |
| Grant date | Aug 30, 2005 |
| Priority date | — |
| Expiry date | Nov 1, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/40032
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An active terminating device (30) for an electrical transmission line with optional line-receiving and line-driving capabilities. The basic device is a two-terminal unit, denoted as a Signal Canceling Unit (SCU), which sensesthe signal available at its terminals (34a, 34b), and applies negative feedback in order to cancel and absorb the signal. When applied to the end of a transmission line (15a, 15b) as part of wired communication network, the SCU functions as a terminator. When connected in the middle of such wired transmission line, the SCU splits the transmission line into two separate and isolated segments. In such a configuration, the SCU can be used to isolate a portion of a network from signal degradation due to noise or bridge-tap. Furthermore, the two isolated segments may each employ independent communications, such that no interference exists between the segments. In another embodiment, line receiver functionality is integrated into the SCU, designated as a Signal Canceling and Receiving Unit (SCRU) (90). The SCRU can perform all the SCU functions, and also serves as a line receiver in the communication network. In yet another embodiment, line driver functionality is in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.