The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 1994
Filed:
Dec. 02, 1992
Donald H Bowen, Lilburn, GA (US);
Michael P Harney, Atlanta, GA (US);
David B Lett, Duluth, GA (US);
Scientific-Atlanta, Inc., Norcross, GA (US);
Abstract
A subscriber terminal with a plug-in expansion card provides for memory expansion and security renewal. The subscriber terminal has a memory control bus including data, address, and control lines which are extended to an expansion connector. In addition, the subscriber terminal includes a secure microprocessor and secure microprocessor bus (SMB) which regulate the secure transactions of the subscriber terminal. The SMB is also extended to the external connector. The expansion card plugs into the external connector and can contain numerous combinations of external memory, such as ROM, RAM, EEPROM, Hash EPROM, or other types of memory, to supplement internal memory and/or a secure microprocessor to renew, supplement, or modify security precautions for the terminal. The extended memory of the expansion card is fully controllable by the control microprocessor of the terminal and is downloadable through the expansion connector to allow changes in the program code stored there. The expansion card is inserted into a narrow slot through the outside cover of the subscribers terminal and is guided by a carrier into the external connector. A protective casing on the card includes a pivotable door which permits the card to maintain a slim profile. The door is opened during the insertion process into the external connector by a pair of tongs positioned at an inclined angle on the carrier to expose the terminal end of the expanding card.