Patent ID: 6366143
Filing Date: 2002-04-02
Classification: H04L

Abstract:
A data communication network, comprising:a first communication device, the first communication device having a plurality of ports, a control coupled to the plurality of ports and having a plurality of outputs extending from the control, with each of the plurality of outputs indicative of the status of one of the plurality of ports; a power shut-off and recovery circuit coupled to the first communication device, said power shut-off and recovery circuit having: (i) a first signal detection circuit coupled to the plurality of ports for detecting activity on each port and for generating a first signal indicative of the activity; (ii) a second signal detection circuit coupled to the plurality of outputs for detecting activity on each port and for generating a second signal indicative of the activity; (iii) a power control circuit, coupled to the first and second signal detection circuits, for receiving the first and second signals, respectively, and for selectively asserting an ENABLE signal based on either the first signal or the second signal; and (iv) a source transfer circuit, coupled to receive the ENABLE signal, for selectively disengaging a power source from the communication device.