BT has announced it will upgrade 199 exchanges to handle ADSL2+ technology capable of download speeds of up to 20Mbps.

According to PC Pro, the telecoms company said the upgrade, which is expected to be completed in spring 2011, will run alongside its current fibre network roll out. The ISP also said that when the upgrade is finished, 75 percent of Brits will have access to either fibre or ADSL2+ net connections.

The proposals cover exchanges in the East Midlands, East of England, North West, North East, South East, Scotland and Wales.

BT also said it was running a trial of a 'priority class of service' that would see communications providers manage their networks on levels of latency and packet loss to ensure business customers get reliable net connections for VoIP services.

In May this year, BT revealed it was increasing its investment in upgrading the UK's aging copper networks to fibre optic cables. The ISP said it expected its £2.5bn investment to ensure two thirds of the UK have access to fibre broadband connections by 2015.

See also: BT launches faster broadband upload speeds

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