Power savings in multiple technology physical layer devices supp

Details Power savings in multiple technology physical layer devices supp Power savings in multiple technology physical layer devices supp

1997-04-08

1999-05-25

Vu, Huy D.

Multiplex communications

Channel assignment techniques

Only active channels transmitted

370465, H04J 317, H04J 316

Patent

active

059075538

ABSTRACT:
A Physical Layer Device is disclosed having power savings features operable during auto-negotiation for multiple technologies. Excessive power consumption is alleviated by decreasing the power required by the receiver(s) during parallel detection. The Physical Layer Device includes at least one port, with each port including a parallel detection receiver for receiving data and messages from a connected device, the data and messages including autonegotiation fast link pulses indicating a technology capability of the connected device, a cycler for enabling the parallel detection receiver for a fraction of an autonegotiation period and a controller for controlling the cycler. The enabling of the receiver for each port, whether a multiple or single port device, is staggered to prevent more than one receiver from being enabled at one time. Accordingly, the receivers are enabled for a brief period of time to check for the presence of the required signals, and then disabled for a much greater period of time before being enabled again. Further, the Physical Layer Devices contains multiple ports that can stagger the enabling of their receivers so that only one port's receiver is active at any given time.

REFERENCES:
patent: 5355375 (1994-10-01), Christensen
patent: 5432775 (1995-07-01), Crayford
patent: 5546549 (1996-08-01), Barrett et al.
patent: 5610903 (1997-03-01), Crayford

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