User-controlled electronic modification of operating system firm

Details User-controlled electronic modification of operating system firm User-controlled electronic modification of operating system firm

1994-02-09

1996-04-02

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

379 27, 379 34, H04M 1100

Patent

active

055048013

ABSTRACT:
A remote test unit for testing and conditioning one or more telephone lines includes multiple electronically erasable flash memory banks, which contain respective versions of the operating system employed by the test unit's micro-controller. An operating system modification routine employed by the host processor of a remote site allows the functionality of the remote test unit to be selectively modified by electronically installing an upgraded or downgraded version of the operating system, or by electronically selectively activating or deactivating one or more operational features of the currently active operating system.

REFERENCES:
patent: 4001559 (1977-01-01), Osborne et al.
patent: 4459436 (1984-07-01), Rubin
patent: 4536617 (1985-08-01), Perry
patent: 5111497 (1992-05-01), Bliven et al.
patent: 5155847 (1993-02-01), Kirouac et al.
patent: 5268928 (1993-12-01), Herh et al.
patent: 5301050 (1994-04-01), Czerwiec et al.

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