10G Fibre Cable OM3








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Let’s face it “Ethernet Rules”. Marketing tells us that 85%+ of the World is networked with Ethernet in some form.

As the industry is flush with the discussions of 10GbE support on copper twisted pair cable one wonders who or what is actually deploying this Ethernet speed today, and in reality what speed are we using on copper or even optical fibre cable, and for what application support or need.

Hence. Part 1 of:- A lighthearted look at Ethernet and the “Need For Speed”.

It will be safe to assume the ratified 10GbE on optical fibre is starting to play some part in a big pipe backbone plane for Data Centres, ISPs, Research and Education Facilities. There is also likely to be areas where 10G is being delivered to Desktops as well… over optical fibre.

Lets start at the top end speed. To deliver 10GbE on fibre for practical distances a high order bandwidth fibre is required. Traditional multimode fibre of 62.5/125, (OM1), & 50/125, (OM2), types, with relatively low order bandwidth capabilities, can only deliver this speed to approximately 30 and 60 metres respectively. This led to the development of a third type of multimode fibre of 50/125 construction, now called OM3. This fibre exhibits high Bandwidth of 2000MHz/Km @ the short wavelength of 850nm. Well suited for the delivery of 10GBASE-S to 300 metres. 10GBASE-S is supported using laser light sources and multimode fibre only.

To deliver 10GbE to greater distances 10GBASE-L is an option although single mode fibre, (OS1), is required.

10GBASE-L, using the longer wavelength laser @ 1310nm and distances up to 10Kms can be achieved providing power budgets are not exceeded.