HOW TO MAKE THIS

vertical: time (decreasing) 5 minute/7 pixels, horizontal 4.31kHz band per pixel

first eight pixels: 5 minute bar

Every other pixel: the number of bits per symbol in a 4.31kHz band

Red is about 10. Black is 0. (See source)

First black stroke is ISDN, then upstream, a gap, then downstream

STATUS	DIFF FROM AVERAGE