TAG | FTTN needn't displace ADSL, says ISP |
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| by Stephen Withers | |
| Tuesday, 08 April 2008 | |
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It is often suggested that installation of a fibre node would involve the removal of existing copper wires serving the premises covered by that node. "If we start from the mistaken belief that we must do a full node cut-over – that is, completely disconnect all of the copper wires leading back to the exchange from every area in which a new node is deployed – the consequences for the industry and consumers will be detrimental and long-lasting," said Hackett. While it might be cheaper to carry out a simultaneous cut-over when a node is installed, Hackett argued that ISPs already pay per-connection fees for ADSL connections and build those costs into their charges, implying that a similar model could be used to move subscribers to (and perhaps from) fibre links. He also claimed there is "strong technical evidence" to show how exchange-based ADSL2+ services can coexist with node-based VDSL2 connections. "Indeed, the critical point of this entire submission is that exchange-based ADSL2+ services can coexist with Node-based VDSL2 services, with practically no performance impact to either service type," added Hackett. VDSL2 can deliver speeds up to 100Mbps over the short distances associated with FTTN. Once the line length reaches around 1.6km (1mi), speeds are similar to ADSL2+. Unlike ADSL, VDSL2 is a symmetric protocol which means subscribers enjoy fast uploads as well as downloads. Providers in Europe and North and South America have already deployed VDSL2 services.
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