Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of subscriber loop or terminal
Patent
1994-02-09
1995-09-19
Chin, Stephen
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of subscriber loop or terminal
379 1, 379 10, 379 22, 379 29, 379 31, H04M 124, H04M 308, H04M 322
Patent
active
054523397
ABSTRACT:
A remote measurement 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. A reset routine ensures that the operating system modification mechanism will only boot up the `correct` one of the two quasi-redundant systems available to the RMU's microcontroller after a system modification has been performed. In addition, the temporary insertion of a no-op code field just prior to the beginning of the program prevents the RMU's processor from accidentally booting up a modified system until the system has been verified as operational.
REFERENCES:
patent: 4937851 (1990-06-01), Lynch
patent: 5018184 (1991-05-01), Abrams
patent: 5195124 (1993-03-01), Ishioka
Kennedy Michael
Moser Laura E.
Schillaci Onofrio
Siu Edward K. W.
Chin Stephen
Harris Corporation
Shankar Vijay
Wands Charles
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