In SMF light follows a single path through the fiber while in MMF it takes multiple paths resulting in differential mode delay (DMD). 10GBASE-LR is a 10-gigabit Ethernet optical standard that operates at 1310 nm over single-mode fiber (SMF), supporting link distances of up to 10 km. I presume my course material is correct for the CCNA exam, but I am sure there is a reason why websites are. Maximum distance over copper cable is 100 meters but because of its bandwidth requirements, higher-grade cables are required. The adoption of 10GbE has been more gradual than previous revisions of Ethernet: in 2007, one million 10GbE ports were shipped, in 2009 two million ports were shipped. 10GBase-LW A variation of the 10GBase-LR that is specially encoded to operate over SONET links 10GBase-SR A Physical layer standard for achieving 10-Gbps data transmission. When choosing a fibre optic cable for a permanent trunk link you should consider three things: 1) what is the distance of the cable run, 2) what bandwidth do I require now, and 3) what might I need in 5, 10 or 15 years time, or what future proofing do I want? Installation costs can be as much as.
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