Theoretical limit of Ethernet

Discussion in 'Networking Issues' started by techmanblues, May 23, 2005.

  1. techmanblues

    techmanblues Network Guru Member

    Now that SMC is shipping 10Gb switches, I am wondering what is the theoretical limit of the speed of Ethernet? As in CPU and Moore's Law, there has to be a limit before the physical support of Ethernet cabling cannot make the speed any faster. But where? Can it reach terabits per second?
  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    Per Network+ 2005:

    10GBASE-SR (10 Gigabits per second)relies on multimode fiber and transmits signals with wavelengths of 850 nonometers (SR stands for "short reach"). 10GBASE-SR relies on multimode fiber and transmits signals with wavelengths of 850 nanometers; the maximum segment lenght on a 10GBASE-SR network depends on the diameter of the fibers used. It also depnes on the modal bandwith used.

    A second standard defined in IEEE 802.3ae is 10GBASE-LR (LR stands for long reach). 10GBASE-LR carries signals with wavelengths of 1310 nanometers through singlemode fiber. Its maximum segment length is 10,000 meters.

    A third 10-gigabit option is 10GBASE-ER (ER stands for extended reach). Like 10GBASE-LR, this standard requires single mode fiber, through which it transmits signals with wavelengths of 1550 nanometers. It allows for segments up to 40,000 meters, or nearly 25 miles.

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