Method and apparatus for four-wire type transmission of digital message signals
US4335455A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1980 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Jun 2, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for the four-wire type transmission of digital message signals between a superordinate system, such as a digital exchange, and a subordinate system, such as a digital subscriber station, along a two-wire transmission line. A regenerator is inserted at a given point in the transmission line which switches the message signal blocks repeatedly and alternately transmitted between the superordinate system and the subordinate system onto a four-wire line within the regenerator. The message signal blocks transmitted from the subordinate system to the superordinate system are separately delayed within the regenerator by a delay time period sufficient to avoid overlap with the time periods during which the message signal blocks transmitted by the superordinate system are received at the regenerator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.