Andrew, I will suggest you to read page 87-91 of second chapter of a book (computer Networks By Andrew S. Tanenbaum) However you can diff. it by 1-you know light signal in fiber propagate in terms of total internal reflection of light. In fiber , different rays will be bouncing at diff angles ,each ray is said to have diff. mode and so a fiber having this property is called Multi mode fiber& its diameter is 50u ,it can be used up to many km without repeater. 2-Now if you reduced diameter of fiber to few(8-10u) wavelengths of light, fiber act like waveguide and light can only propagate in a straight line without bouncing and so called a single mode fiber,single mode fiber are more expensive and are used for longer distances.(up to 100km) Asif Sr Network Engineer Bsc Elect/Communication Engg CCNA,MCP Darren Ward wrote: > I guess one thing to remember is that Multimode uses a LED as a light source > and Singlemode uses a Laser. > > Since the laser provides a more focused and coherent pulse of light it can > travel through fibre over longer distances. > > The multimode cable also has a larger core and does not require as high a > specification grade as single mode. > Single mode is usually of a much higher manufacturing quality and clarity as > well over multimode. > > So in a laymans nutshell multimode uses a LED to communicate via a larger > core fibre over short distances (Up to 2km). > Single mode uses a Laser to communicate and can travel much longer distances > (90km without regeneration using LX) > > I'm no optical engineer either so these are just the basics I've picked up > from study and experience so far. > > Darren > > "Andrew C. Ohnstad" wrote: > > > Pardon the slightly off topicness of this but... > > > > I'm reading up on FDDI and GigE. All this talk of multi-mode and > > single-mode fiber has my head spinning. > > > > Does anyone know of a site that lists in non-electrical engineering terms > > the differences between the two? I've found a distance chart, so I know > > how far I can run each one, but I'm more interested in the 'why' without > > having to do 2 pages of higher math to understand the answer. > > > > Thanks! > > > > =-=Andrew C. Ohnstad, CCNA > > "Traveling At The Speed of Thought" --- Teenage FanClub > > > > ___________________________________ > > FAQ, list archives, and subscription info: http://www.groupstudy.com > > Posting Guidelines: http://www.groupstudy.com/list/guide.html > > ___________________________________ > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html > FAQ, list archives, and subscription info: http://www.groupstudy.com > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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