Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1995-08-04
1998-02-03
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455343, 379 59, H04B 140
Patent
active
057155232
ABSTRACT:
Access control is provided for a fixed cellular terminal using a secondary power source. Upon detecting an interruption of power from a primary power source, a signal is provided to reset a non-volatile memory in the fixed cellular terminal to erase a password previously stored in the memory. A secondary power source supplies power for these functions. Upon the memory reset, a subscriber must again enter a password to use the fixed cellular terminal for gaining access to a radio network. Another embodiment of the invention includes a timer for triggering a timing interval after interruption of the primary power is detected. The memory is reset only if the timing interval expires while the primary power is still below the threshold operating level. In yet another embodiment of the invention, a microprocessor determines whether a call is in progress. The memory is reset only if the call is not in progress when the timing interval expires while the primary power is still below the threshold operating level. If the call is in progress under these conditions, then the reset occurs at the termination of the call.
REFERENCES:
patent: 4940975 (1990-07-01), Ide et al.
MCI Corporation
Vo Nguyen
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