Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
2004-12-07
2009-10-13
Nguyen, Hanh (Department: 2416)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S395100, C370S469000, C370S419000, C375S240000
Reexamination Certificate
active
07602806
ABSTRACT:
Signaling and coding methods and apparatus for long-range 10 and 100 mbps Ethernet transmission. In accordance with the method, a physical layer (PHY) device is provided that includes the long-range capabilities. In operation, the PHY measures the distance to a companion PHY, and if it is within the specification limits, communicates with the companion device in the normal way. If the distance is above the specification limits, the PHY checks to see if the companion PHY is similarly enabled, and if so, switches to a long-range signaling method. In a preferred embodiment, NRZ coding with pre-emphasis on the first bit of two or more bits of the same value is used for a first range exceeding the specification limit, and PAM4 coding is used for a second range exceeding the first range. Various embodiments are disclosed.
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Hao Jianbin
Yang Kewei
Yao Fei
Zhu Ning
Analogix Semiconductor, Inc.
Blakely , Sokoloff, Taylor & Zafman LLP
Nguyen Hanh
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