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21CN - First customers go live on BT's next generation network in South Wales

BT engineer

BT has successfully migrated more than 75,000 end users to 21CN voice services in South Wales. To prepare for UK-wide voice migration to 21CN a further ~200,000 end users’ voice services will be migrated to 21CN over the next few months.

The transfer of the first customer lines to BT's new next generation network began at Wick in the Vale of Glamorgan. To reach this important milestone by BT had to:

  • re-build around ten per cent of the UK’s core national communications infrastructure
  • install 21CN equipment at over 100 sites across the UK
  • lay more than 2,300 kilometres of new fibre optic cable in South Wales
  • invest more than 1,500 man years in developing new IT systems to support the new network

conduct around half a million tests prior to the start of end user migration. This included carrying more than 80 million test calls over an IP trunk network link and more than 300 trialists testing end to end calls.