 In Canada the Department of Communications started a lengthy development program in the late 1970s that led to a graphical "second generation" service known as Telidon.Telidon was able to deliver service using the vertical blanking interval of a TV signal or completely by telephone using a Bell 202 style (split baud rate 150/1200) modem.The TV signal was used in a similar fashion to Ceefax, but used more of the available signal (due to differences in the signals between North America and Europe) for a data rate about 1200-bit/s.