I'f i'm not mistaken, there is two type of channel limiting modules. cs_chanlimit by Trystan and cs_limit by Rob. The cs_limit module (which i currently used, and works on 1.7.17 too) by Rob can be found from the old modules site but i'm not sure about cs_chanlimit :p
[Edited on 25-10-2006 by n00bie]