InfiniBand uses copper CX4 Gigabit Infiniband Cable for SDR and DDR rates — also commonly used to connect SAS (Serial Attached SCSI) HBAs to external (SAS) disk arrays. With SAS, this is known as an SFF-8470 connector, and is referred to as an "InfiniBand-style" Connector. The latest connectors used with QDR and FDR are QSFP (Quad SFP) and can be copper or fiber, depending on the length required.The passive copper cables provide robust connections up to http://www.fiberyes.com/cx4-cx4-cables eight meters in length and require no power from the connector. The CX4 Gigabit Infiniband Cable are a thinner alternative to the passive six and eight meter cables, and are available up to 15 meters in length. All cables have easy to read serial numbers printed at each end to facilitate installation and network debug.
electrical module that incorporates the complete physical layer functionality from XAUI compliant 4 lanes x 3.125 Gb/s four differential electrical interface to the micro CX4 Gigabit Infiniband Cable interface. The x-mGC is plugged into a X2 hosting system and connects to a 4X InfiniBand cable. The control interface (MDIO)is also integrated. The x-mGC module includes 10Gb/s Ethernet transmitter and receiver ports. The host may control the x-mGC registers using XAUI interface as defined in the X2 MSA. The MUX/DEMUX, XAUI interface and MDIO management functions are all integrated into the module, as is a precision oscillator that removes any need for an external reference clock
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