Teletext and to pad out the fixed packet. The vertical caption position is determined by the packet address. In the case of the Ceefax and ORACLE systems and their successors in the UK, the teletext signal is transmitted as part of the ordinary analog TV signal but concealed from view in the Vertical Blanking Interval (VBI) television lines which do not carry picture information. The teletext signal is digitally coded as 45-byte packets, so the resulting rate is 7,175 bits per second per used lines (41 7-bit 'bytes' per line, on each of 25 frames per second). A teletext page comprises
Sbectel service in conjunction with Teletext Ltd, Teletext on 4, on pages 400-499. In September 2007 the bilingual digital text service available on S4C Digidol was launched only to Freeview viewers in Wales. When the first area in Wales (most of South West Wales) completed its Digital Switchover on 9 September 2009, 'Sbectel' also ceased. Partly it has been replaced by service pages from s4c and bbc on the internet, as: Sbectel Sbectel () is the name of S4C's former ancillary teletext service. It was named after the Welsh language S4C programme magazine called Sbec (Welsh for 'peek') which was originally