While 40Gb Ethernet is an emerging technology, there are many options with QSFP+ to QSFP+ cables or for longer distances up to 10,000 kilometers using the LR4 transceiver. Dell also supports breaking out 40Gb QSFP+ ports using QSFP+ DAC Break Out Cables to split out each 40Gb port and connect up to four 10Gb SFP+ DAC connections.
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DELL X8DKW DELL QSFP+ / 4xSFP+, 5m InfiniBand/fibre optic cable 196.9"" (5 m) QSFP+ 4 x SFP+