Example

Channel 1 23:59:40 on 23:59:48 off
Channel 1 23:59:50 on 00:00:10 off

Channel 2 00:00:10 on 00:00:15 off

Channel 3 23:59:40 on 00:00:25 off

Channel 8 23:59:50 on 00:00:30 off

http://www.youtube.com/watch?v=3iX6CnsFSmQ