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FEATURE FTTDP
One interesting thing we have seen over the last few years is that operators no longer choose a single technology
five years. Once you have recovered the return on that, then make the final investment.’ He continued: ‘For greenfield deployments – where you are connecting new buildings and you’re wiring up those new buildings with something – our firm belief is it is an absolute no-brainer to do FTTH in that scenario. It’s actually cheaper to do FTTH, because given the cost per metre for the materials these days, fibre is actually cheaper.’ FTTdp is attractive not only because it
removes the need to dig up so many streets, it also reduces the initial investment. With its potential for data transmission rates of up to 1Gbps cover copper, G.fast makes the case for FTTdp even stronger. ‘G.fast is the next step in terms of copper
technologies. Compared to VDSL2, it offers a lot more bandwidth,’ said Vanhastel. He continued: ‘Te main difference compared to VDSL2 is that it uses a much larger part of the analogue frequency spectrum’. Te most widely deployed VDSL2 technology deployed today uses frequencies between 0 and 17 MHz. G.fast standards specify the use of the spectrum up to 106 MHz but ‘there are already discussions within the industry about 212MHz which doubles up on the spectrum again,’ said Kelly. He continued: ‘Not all of that increased spectrum will equate to a doubling of the bandwidth, but you will still see an increase over and above what G.fast is predicting at the moment.’
Cross-talk and short distances Te main difficulty with higher frequencies is increasing cross talk between the copper pairs
Issue 3 • Spring 2014 FIBRE SYSTEMS 23
Gualtiero Boffi/ Luka Skywalker /
Shutterstock.com
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