Patent ID: 8867564
Filing Date: 2014-10-21
Classification: H04L

Abstract:
1. A method for wired communication, the method comprising: detecting in a local physical device (PHY) which of one or more twisted-pairs are active and whether a range of a remote PHY is greater than 100 meters prior to performing any auto-negotiation procedure, wherein said local PHY and said remote PHY are communicatively coupled via said one or more twisted-pairs, said detecting is based on tone bursts received via said one or more twisted pairs during one or both of a power up operation and a reset operation of said local PHY, said tone bursts have a frequency of less than 2 MHz, which is in a cutoff area outside of a range of frequencies for receivers operating to receive Ethernet link pulses; and establishing an operating mode common to said local PHY and said remote PHY based on which of said one or more twisted-pairs are active and based on said detected range of said remote PHY.