On Tue, 9 Dec 2003, Miguel Mata-Cardona wrote:
As far as I have understood, the idea is to use the fiber as it was coax, doing some kind of FDM (frequency division multiplexing) with the lambdas (somehow the same). This would give us the capability to move at leat n x 10mbps ethernet on the same fiber using diferent lambdas for each customer, until power budget goes down.
The units that I worked with in the past (from an outfit called Quantum Bridge www.quantumbridge.com) worked pretty well, but the deployment model didn't meet my emplolyer's biz model (since it required outside plant). Basically the way it worked was it ran ATM OC-3 (mabe OC-12) down the fiber, using passive optical splitters, to the CPE. The CPE used a TDM style muxing for the return on a different lambda on the same fibre. The CPE itself was interesting too. It provided a 100bt ethernet port (showed up as and ATM pvc at the headend, with the actually allocated bandwidth controllable from 1.5 to 100 megs, as well as 4 DS1 ports. The DS1s were Circuit Emulated over the ATM fabric. Concerptually it was very interesting, and I imagine other POS solutions are similar, as simply using a lambda per customer would not be an efficient utilization of the available bandwidth. -Scott --- Scott Call Router Geek, ATGi, home of $6.95 Prime Rib I make the world a better place, I boycott Wal-Mart