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Browse Prior Art Database

Adaptive Network Riser card

IP.com Disclosure Number: IPCOM000014192D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2003-Jun-19

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Adaptive Network Riser Card This invention describes a network riser card that can adapt to either of two MAC (Media Access Control) to Phy (Physical) interfaces that may be present on the motherboard. Two MAC to Phy interfaces exist in the industry. Either of these can be present on a PC Motherboard. If both interfaces appear on one connector then either one needs a card to work with each interface (for a total of 2 cards) or one can have a card that handles both interfaces. This invention describes how to get one card to handle either interface eliminating the need for two different cards. The figure below shows several ways to implement this function given the different type of riser connector used. One proposal is to use a connector with the interfaces muxed. Any one motherboard would only send up one interface to the riser connector. Jordan for Intel based boards and MII (Media independent interface) for others. This will require one set of risers for Intel based boards and one set for others. This is shown on the left hand picture. This invention uses the PnP (plug and play) circuits of the riser along with some glue logic to demux (demultiplex) the proper interface and send it to one of two Phy's on the card. This allows a single card to work with any motherboard regardless of chips set on the motherboard. The other two pictures solve the problem for the case where the 2 interfaces are on the connector and depending upon chip set only one is active. These cards uses the PnP logic to either decode the proper interface and send the signals to a "universal phy" or to pick and activate the proper phy (of 2 on the riser) for use on the LAN (Local Area Network). 1