A viewdata system which is developed by the British Telecom. Prestel contains as much as 170 000 “frames” of information (as compared with 100 frames transmitted via Ceefax).; 一種可視數(shù)據(jù)系統(tǒng)，由英國電報公司開發(fā)。Prestel 包含多達170 000 “幀” 信息(通過 Ceefax傳輸?shù)臑?00幀)。參閱teletex。