128 Gigabit Fibre Channel Speed Negotiation

摘要

The FC port state machine enhanced by determining if various lanes are configured to be operated in 128 Gbps mode by operating as parallel lanes as indicated by using a reserved bit in a link training field. If so and if all of the ports are 32 Gbps ports and pass training, then four lanes can be combined to form a 128 Gbps link. If the ports are configured for 128 Gbps only operation and at least one lane does not negotiate to 32 Gbps or fails training, the link is not activated and none of the lanes are activated. If the ports are configured to do either 128 Gbps or independent operation and at least one lane cannot operate at 128 Gbps, then the lanes operate independently at the negotiated and trained speed. If the lanes are configured for only independent operation the transceiver develops independent links as negotiated.

主权项

1. A method comprising:
performing speed negotiation and transmitter training on the ports at one end of four parallel connected Fibre Channel links; determining, after speed negotiation and transmitter training, if the ports at one end of each of the four parallel connected Fibre Channel links are capable of operating as parallel lanes; determining, after speed negotiation and transmitter training, if each of the ports at one end of the four parallel connected Fibre Channel links are configured for 128 Gbps operation; determining, after speed negotiation and transmitter training, if each of the four parallel connected Fibre Channel links has negotiated for 32 Gbps operation; and configuring each of the ports at one end of the four parallel connected Fibre Channel links for 128 Gbps operation upon determining that the ports at one end of each of the four parallel connected Fibre Channel links are capable of operating as parallel lanes, that each of the ports at one end of each of the four parallel connected Fibre Channel links are configured for 128 Gbps operation and that each of the four parallel connected Fibre Channel links has negotiated for 32 Gbps operation.