Is there a published maximum number of analog line cards in an NBX 100 chassis? We have a V3000 with a NBX 100 chassis with 2 analog line cards; 3 of the 4 ports in the V3000 have failed. Someone here thinks that the maximum number of line cards in the chassis is two, but I have an extra NBX 100 line card and we are in a pinch until we can replace the V3000.