10GBASE-S
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as defined by IEEE 802.3ae, is for multimode fiber (MMF) with a 850-nm laser transceiver with a bandwidth of 10 Gbps. It can support up to a 300-meter cable length. The 10GBASE-SR media type is designed for use over dark fiber, while the 10GBASE-SW media type is designed to connect to SONET equipment. IEEE Specification: IEEE 802.3ae