On 29/02/2016 5:55 PM, David Lochrin wrote: > Just for the record... Analogue or digital, 1980's synchronous modem or 2020 > fibre, no matter what the technological cleverness any communication channel > is subject to Shannon's Law. True. > This states that the maximum channel capacity is a function of transmitted > power, bandwidth, and signal-to-noise ratio. True,
However, Shannon's law is silent on the number of channels that a medium can carry. Fibre can carry many more channels than copper, coax or radio. Fibre modems, using Wavelength-division multiplexing can, currently, handle up to 160 channels. This means that a basic 10 Gbit/s system over a single fiber pair can be expanded to over 1.6 Tbit/s. [*] And just for the record, you don't have to change the fiber, just the boxes at either end. [*] https://en.wikipedia.org/wiki/Wavelength-division_multiplexing -- Regards brd Bernard Robertson-Dunn Sydney Australia email: [email protected] web: www.drbrd.com web: www.problemsfirst.com Blog: www.problemsfirst.com/blog _______________________________________________ Link mailing list [email protected] http://mailman.anu.edu.au/mailman/listinfo/link
