2012/3/22 Masataka Ohta <mo...@necom830.hpcl.titech.ac.jp>: > William Herrin wrote:
> The entire optics is shared by all the subscribers sharing > a fiber. > Thus, the problem is collision avoidance of simultaneous > transmission, which makes PON time shared with L2 protocols. Hm... i'm thinking one transceiver might malfunction and get stuck/frozen in the "transmitting pulse" state, thus making collision avoidance impossible, kind of like a shorted NIC on a shared bus topology LAN, if just one subscriber's equipment happens to have the right kind of failure, and that's neglecting the possibility of intentional attack. Passive optically-shared fiber networks don't sound so hot in that case. >> So, you share fiber by having one guy control one wavelength (color, >> e.g. red) and another guy control another wavelength (e.g. blue). > That's not a usual PON but WDN PON. -- -JH
