available characters consisted of upper and lower case alphanumeric characters as well as punctuation and simple arithmetic symbols, using a variant of iso 646 and ccitt standard. this layout was later formalised in the 1981 cept videotex standard as the cept3 profile. by embedding cursor-control characters within the page data, it was also possible to encode simple animations by re-writing parts of the screen already displayed. these were termed "dynamic frames" and could not be created online using conventional editing terminals, but required specialist software and uploading via the "bulk update" facility. no timing options were available beyond that imposed by the available transmission speed, usually 1,200 baud.