Jimmy Hess 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.
That is a real problem harming healthy development of broadband Internet.
Passive optically-shared fiber networks don't sound so hot in that case.
Worse, as optical fibers are so cheap these days, SS (single star) costs less than PON, because PON requires more complicated wiring. Even worse, if people are deceived to recognize PON cheaper than SS, it is impossible to have optical Internet in sparsely populated area where optical Internet with SS is possible. It can be said that PON was promoted by ILECs only to keep their monopoly. Masataka Ohta