Method and system for an extended range ethernet link discovery signaling

摘要

Aspects of a method and system for extended range Ethernet link discovery signaling are provided. A local PHY may detect of one or more active twisted-pair wires in a remote PHY in extended range applications. The local PHY may determine whether to operate as a master or slave based on detected pairs. When operating as a master device, the local PHY may correct twisted-pair wire swap information received from the remote PHY before communicating an encoded link length value to the remote PHY. When operating as a slave device, the local PHY may transmit encoded twisted-pair wire swap information to the remote PHY before recovering a link length value communicated from the remote PHY. The local PHY may communicate supported operating modes based on the link length value to the remote PHY. Moreover, the local PHY may enable establishing a common full duplex operating mode with the remote PHY.

主权项

1. A method for wired communication, the method comprising:
receiving, at a local Ethernet PHY, tone bursts having a frequency of less than 2 MHz, which is outside a range of frequencies for receivers operating to receive Ethernet link pulses, via one or more twisted pairs during one or both of a power up operation or a reset operation of the local Ethernet PHY; detecting in the local Ethernet PHY, based on the received tone bursts, whether the one or more twisted-pairs are active in a remote Ethernet PHY and whether a length of the one or more twisted pairs is greater than 100 meters prior to performing any auto-negotiation procedure; and establishing an operation mode common to the local PHY and the remote PHY via the detected one or more active twisted-pairs based on the detecting, wherein each of the tone bursts comprises approximately a 2 ms square wave having a frequency of approximately 1 MHz.