I just tried both links. They work for me. Perhaps you can just go to SMPTE.org and do a search for the document numbers through the main site.
Here’s another link to a page where the relevant document info appears at the bottom of the page:
http://standards.smpte.org/search?hits=80&resource-type=HWCIT&submit=Go&sortspec=smptes-number&group-code=smptes&format=standard&smptes-subject=Television&FIRSTINDEX=480