Communication line transient protection
US4751607A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Aug 11, 1986 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Aug 11, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/28
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The severity of the problems of transmitting high speed data over a regular twisted wire pair are legendary. These problems arise from a variety of conditions, including the capacitance of the wire (which increases with length) and the propensity of unshielded wire to pickup high induced voltages. An arrangement is disclosed that is suitable for short, as well as long, wire distances and which also effectively eliminates the interference problem caused by induced voltages, including those causes by electrostatic discharge. This arrangement passes two twisted wire pairs through a series of ferrite cores. The twisted wire pairs coming out of the ferrite cores are terminated such that one of the pairs is connected to ground while the signal carrying twisted pair is connected to a small signal balun coil, pulse shaping circuit and low pass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.