Method and apparatus for supporting physical layer link-suspend operation between network nodes
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United States of America Patent
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Sep 21, 2004
Grant Date -
N/A
app pub date -
Sep 28, 2000
filing date -
Sep 28, 2000
priority date (Note) -
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Abstract
A link-suspend operation between network nodes in a point-to-point data communications link is presented. Individual network links will have a full power operational mode for supporting full high-bandwidth communication, and a low power 'link-suspend' (LS) operational mode for temporary operation when only limited communication is occurring. The communications link is maintained, while cycling transmitter power on and off during idle periods with a duty cycle that substantially reduces physical layer device (PHY) power, using LSPs. LS mode may be negotiated by advertising capabilities between two network devices. Thus, PHYs at either end of a link can notify the other of the capability to support a LS mode of operation and can negotiate parameters for communications using the LS mode. Further, transmitting and receiving continuous idles, valid data frames, and Wake-on LAN (WOL) packets is supported. Similarly, notification of 'wake-up' schemes and detection of suspended WOL network device is supported.
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