QUOTE(mark @ May 3 2011, 08:26 PM)
Hmm, so if I add another SLAN1236 at Room 3 for CPU 2, it should be enough?
Also, just wondering -- if I'm already protected from Telekom, and protected from TNB (Room 1 + Room 3 protected) - why would I need to protect my LAN cables with SLAN1236?
here the revised setup...

any metal built items able to attract surge... hence the longer cable, the higher exposure toward to environment... that the reasons SD-4C & SLAN1236 designed for long lan cable, furthermore ur house build with metal bar, water pipe, metal grille, etc as those able to attract surge & staics and "jump" into any cables easily...
asuumed u only protect Room3's lan point, dont forget the surge will able to route into ur router, hence router connected to CPU and multisocket which means all of the Room1's equipments still facing the risks...
click the link below and read post #770 to prove that LAN cable able to carry surge...
http://forum.lowyat.net/topic/272679/+760