Telephone line unit having programmable read-only memory

Details Telephone line unit having programmable read-only memory Telephone line unit having programmable read-only memory

1990-11-20

1993-11-30

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379400, 379382, 379377, 379212, 379 20, 370 67, H04Q 1104

Patent

active

052673090

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.

REFERENCES:
patent: 3826876 (1974-07-01), Gueldenpfenning et al.
patent: 4081613 (1978-03-01), Reines et al.
patent: 4232199 (1980-11-01), Boatwright et al.
patent: 4232293 (1980-11-01), Harris
patent: 4270027 (1981-05-01), Agrawal et al.
patent: 4706270 (1987-11-01), Astegiano et al.
patent: 4805209 (1989-02-01), Baker, Jr. et al.
patent: 4993019 (1991-02-01), Cole et al.
patent: 5001741 (1991-03-01), Sayer
patent: 5088089 (1992-02-01), Gingell et al.

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