What is GB and CB?

lingling

can anyone to tell me about thattvb now,tvbnow,bttvb3 d* A% h, j. \) D0 w- Q7 q
what is GB and CB?  D, S/ u) p, i$ O# a+ K0 c
0 L9 u0 r0 T% q7 _/ k* W3 f
because i saw a post talk about that5.39.217.77:8898' i1 \2 j  c( t2 @' A& |+ D& A) r
http://www.tvbnow.com/thread-72978-1-1.html