The yellow cables are single-mode duplex fiber optic connections. There are two basic types of optical fiber used for 10 Gigabit Ethernet: single-mode (SMF) and multi-mode (MMF). 10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second. It was first defined by the IEEE 802. Unlike previous Ethernet standards, 10GbE defines only full-duplex. Typically, single mode fiber optic cables are made from a single glass fiber strand, resulting in a very narrow core diameter of around 9µm. The standard has a maximum distance of 10 meters, though Cisco currently only offers lengths up to 5m. 10GbE works only in full-duplex mode, which enables the transmission of data in both directions simultaneously on the.
