On 7/25/2001 at 11:25:55 -0700, Rishi Grover said:

Hi,

I don't know if this is the right forum

No. It isn't. A simple google search would have turned up: http://www.g3m.com/applications/OpticalFiberNetworks.pdf A careful reading of the secion on UPSR would have answered most of your questions. A little thought on how telco circuits work would have answered the rest. -- Dave Israel Senior Manager, IP Backbone Intermedia Business Internet