Method and apparatus for transmitting 10BASE-T signals across a

Details Method and apparatus for transmitting 10BASE-T signals across a Method and apparatus for transmitting 10BASE-T signals across a

1997-10-10

2000-10-31

Hsu, Alpus H.

Multiplex communications

Channel assignment techniques

Details of circuit or interface for connecting user to the...

370465, 341 51, 341110, H04L 1266, H03M 734, H03M 100, H04J 316

Patent

active

061413526

ABSTRACT:
A method and apparatus for transmitting waveshape information compatible with IEEE 802.3, 10BASE-T, Ethernet LAN standards across a service interface commercially implemented in a single speed, physical layer device compatible with IEEE 802.3, and 100BASE-X Ethernet LAN standards. The method and apparatus provide support for dual speed, 10/100 Mb/s physical layer devices. The coding of the 10BASE-T information across the physical layer device service interface is based on the observation that all legitimate 10BASE-T waveforms on the medium can be represented by a small group of edge shapes clocked at 20 MHz. This alternate, compact coding of 10BASE-T information is mapped over a service interface implementation which can alternately carry 100BASE-X code-bit information to provide dual speed, 10/100 Mb/s IEEE standards compliant performance, but does not necessarily adhere to the architectural boundaries and signaling primitives defined in the IEEE 802.3 standard.

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"AM/79865/AM79866A Physical Data Transmitter/Physical Data Receiver," Advanced Micro Devices White Paper, Publication #15451, Rev: D, Issue Date: Jun. 1996, 17 pages.

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