Power shut-off and recovery circuit for data communication devic

Details Power shut-off and recovery circuit for data communication devic Power shut-off and recovery circuit for data communication devic

1998-05-01

1999-08-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327 20, H03L 700

Patent

active

059364424

ABSTRACT:
A power shut-off and recovery circuit for data communication devices is provided. The power shut-off and recovery circuit has a power control circuit for polling a plurality of ports. The power control circuit determines how many of the ports are in an operational mode and compares the number of active ports to a predetermined number of ports. If the number of active ports is less than the predetermined number of ports, the power control circuit de-asserts an ENABLE signal. If the number of active ports is greater than or equal to the predetermined number of ports, the power control circuit asserts the ENABLE signal. A source transfer circuit is provided for selectively disengaging the data communication device from a power source in response to the ENABLE signal. The power control circuit re-polls all the ports and updates the ENABLE signal accordingly.

REFERENCES:
patent: 5465926 (1995-11-01), Brown

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