Patent ID: 7602806
Filing Date: 2009-10-13
Classification: H04L

Abstract:
1. An Ethernet PHY adapted to support long-range communication over a twisted pair in at least 10 Mega bits per second (Mbps) and 100 Mbps transmission, the PHY comprising: a first transmitter and a first receiver having an input and an output, respectively, adapted to couple to a media access unit, the first transmitter and the first receiver being configured to handle physical link signaling (PLS) and physical coding sub-layer (PCS); a second transmitter and a second receiver having an input and an output, respectively, coupled to an output and an input of the first transmitter and the first receiver, respectively, the second transmitter and a second receiver being configured to handle physical medium attachment (PMA) and the physical medium dependent (PMD) sub-layer functions; a digital to analog converter (DAC) having an input coupled to the output of the second transmitter and an output coupled to the twisted pair, the DAC being configured to transfer data from the digital to the analog domain with selective pre-emphasis to the twisted pair; an analog to digital converter (ADC) with equalization capabilities configured to transfer analog data received from the twisted pair to digital data, an output of the ADC being coupled to an input of the second receiver; and, an extended auto-negotiation unit having an input coupled to an output of the second receiver and an output coupled to an input of the second transmitter and configured to determine the distance between the PHY and a second PHY and resetting of the signal coding when operating in a long-range mode; wherein the long-range for the 10 Mbps transmission is at least up to 500 meters and wherein the at least up to 500 meters is achieved by sending a stream of symbols, each symbol representing at least 2 bits.