Multiplex communications – Channel assignment techniques – Using a separate control line or bus for access control
Patent
1999-04-14
2000-10-31
Nguyen, Chau
Multiplex communications
Channel assignment techniques
Using a separate control line or bus for access control
370462, 370445, H04L 1240, H04J 302
Patent
active
06141350&
ABSTRACT:
A novel auto-negotiation system capable of performing auto-negotiation using negative link pulses. The auto-negotiation system operates in a network transceiver for interconnecting multiple hub communication devices having different operating speeds and link partners provided on a transmission medium. The network transceiver comprises physical layer devices for supporting data exchange between the hub devices and the link partners, and an auto-negotiation device that transmits and receives link pulses of a prescribed polarity carrying auto-negotiation information to and from the link partners to select a mode of communication between the hub devices and the link partners. A reverse polarity detection and correction circuit is provided for supporting auto-negotiation operations when link pulses received from a link partner have a reverse polarity. In a preferred embodiment, the reverse polarity detection and correction circuit comprises a polarity detector for detecting polarity of the link pulses received from the link partner, and a link pulse detector for distinguishing link pulses from data received from the link partner. A polarity reversing circuit responsive to the polarity detector and the link pulse detector reverses polarity of the received link pulses.
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Mahale Dinesh
Runaldue Thomas J.
Advanced Micro Devices , Inc.
Lee Chiho Andrew
Nguyen Chau
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