Hmm, I’m not getting the link you mentioned. When I browse to the Ceton webpage, select the CableCARD tab, and then click on “Conditional Access,” the only link that’s on the page that comes up is for refreshing the page. There’s nothing about SubExpireTime. None of the other links on the CableCARD page say anything about that, either.
I can send/attach a JPG screenshot if you think that might help.