Automated protocol selection for host adapter card

A networking system, comprising:

• a host adapter card including a card connector and a controller, the card connector including four independent transceiver pairs and a predefined mechanical connector configuration, the controller including control logic for detecting whether a single-channel physical connection or a four-channel physical connection is made to the card connector and control logic for communicating over a network using a first, four-channel protocol in response to detecting the four-channel physical connection or using an alternative, single-channel protocol in response to detecting the single-channel physical connection;
• and
• an alternative-network compatibility device including a first connector configured for releasably mating with the card connector and a second connector having a different mechanical connector configuration than the card connector, the alternative-network compatibility device including a transceiver lane from the first connector to the second connector, the transceiver lane of the alternative-network compatibility device being placed in physical connection with one of the four independent transceiver pairs of the card connector when the first connector of the alternative-network compatibility device is mated with the card connector of the host adapter card.