Bandwidth control for differential manchester encoding auto-negotiation signaling

摘要

A network device includes a communication interface and a transmitter coupled to the communication interface. The transmitter is configured to determine to start an auto-negotiation page with a link partner, and transmit, through the communication interface, a start delimiter for the auto-negotiation page. The transmitter transmits the start delimiter by transmitting a first pulse comprising a first encoding violation, followed by a second pulse comprising a second encoding violation. The transmitter may shorten the first pulse and the second pulse relative to a different pre-defined start delimiter to define spectral content for the first pulse and the second pulse that passes different first and second receiver filters in the link partner for different first and second communication standards.

主权项

1. A system comprising:
a communication interface operable to communicate with:
a first receiver according to a first communication standard; anda second receiver according to a second communication standard that is different than the first communication standard; and a transmitter coupled with the communication interface, the transmitter configured to:
determine to start an auto-negotiation page; andtransmit, through the communication interface, a start delimiter prior to the auto-negotiation page, the start delimiter comprising:
a first section comprising a first encoding violation, followed by:a second section comprising a second encoding violation, where:the first section followed by the second section define a start delimiter length adapted to create spectral content for the start delimiter that:
passes sufficiently through a first receiver filter for the first receiver, to allow the first receiver to detect the first encoding violation and the second encoding violation; andpasses sufficiently through a second receiver filter for the second receiver, to allow the second receiver to detect the first encoding violation and the second encoding violation.