Telephone line unit having programmable read-only memory
US5267309A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1990 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A line unit, used in a line shelf having a line shelf processor and common logic, is provided with an EEPROM device for storing information relative to the line unit. The stored information includes line unit type identification codes, auto provisioning data, gain and equalization adjustment data and signaling translation tables. The data contained within the EEPROM may be utilized by the line shelf processor to provide automatic initialization and provisioning of the line unit when first inserted into the line shelf, and automatic signaling translation so that line unit signaling becomes compatible with a transmission facility connected to the line shelf. The need for factory preset resistors installed in the line unit may be eliminated by storing within the EEPROM a required gain setting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.