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
BBC World Service Television near-continuous direct rebroadcast of BBC1 and schedule pattern timed to UK time (GMT/BST), it had a schedule pattern more synchronised to Central European Time and many of its first-run programmes were timeshifted to more suitable times for viewing in CET, as well as showing specially commissioned "World Service News" bulletins from Television Centre. The BBC World Service News studio looked like the BBC's domestic news, though with different graphics and an on-screen logo. The station also broadcast its own Children's BBC junctions from Presentation Studio A. Outside Europe, BBC World Service Television was the name of the 24-hour news, information