CCIR System I

Analog TV systems global map, with System I in light green.

CCIR System I is an analogue broadcast television system. It was first used in the Republic of Ireland starting in December 1961 as the 625-line broadcasting standard to be used on VHF Band I and Band III, sharing Band III with 405-line System A signals radiated in the north and east[1] of the country. The Republic of Ireland slowly extended its use of System I onto the UHF bands.

The UK started its own 625-line television service in 1964 also using System I, but on UHF only – the UK has never used VHF for 625-line television except for some cable relay distribution systems.

Since then, System I has been adopted for use by Hong Kong, Macau, the Falkland Islands, South Africa, Angola, Botswana, Lesotho, Namibia, Tanzania, Saint Helena, Pitcairn Islands.[2]

As of late 2012, analogue television is no longer transmitted in either the UK or the Republic of Ireland. South Africa is still broadcasting in System I, but have plans to end the service at any time.

  1. ^ "405 Lines in Ireland (1961 - 1983)". Irish TV - Over forty years of Irish TV History. 18 May 2007. Archived from the original on 18 May 2007. Retrieved 15 May 2023.
  2. ^ Amadeus Trappe, Raffael (2005). "Weltweite Fernsehsysteme (NTSC, PAL und SECAM)". www.paradiso-design.net. Retrieved 5 June 2023.[permanent dead link‍]