Sky viewers will see the extra channels appear from channel 450, while Freesat will see the services added on channel 150. HD viewers on both platforms will see the HD versions of the channels.
Last minute tests took place on satellite during the course of Tuesday, including various test cards and a mock Paralympic schedule dated 30th July...
Freesat viewers with a Humax box will see the extra channels being added automatically during the early hours of Thursday morning as a result of the routine "overnight housekeeping" that Humax boxes undertake every night.
On Freeview, one of the three extra channels will be available on Freeview's HD platform. Channel 304 is expected to come to life shortly. It has been showing a static caption until now. The extra streams will be available on Channel 4's Paralympic website. In addition, the official Paralympics.org website will showcase video content from the events.
Before the extra channels start, Channel 4, Channel 4HD and More 4 will be showing live coverage of tonight's Opening Ceremony. Audio Description will be carried on More 4.
- Check out a516digital.com's Paralympic reception guide - channel numbers and frequencies for all major platforms: http://www.a516digital.com/p/paralympic-coverage.html
ITV1 HD Granada
Meanwhile, there's been further changes to ITV1 Granada HD on satellite. The service has moved frequencies to 10994 H. Sky and Freesat viewers are not required to retune - the service is being automatically switched in the background. ITV1 Granada HD is also distributed outside of the Granada TV region across the North of England, as not all ITV regions currently transmit an HD simulcast.