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To: TimF who wrote (7403)	6/24/2000 9:52:00 PM
From: Frank A. Coluccio	Respond to of 12823

twfowler, Dark fiber is fiber that has been installed without the conventional opto-electronics that has traditionally been provided by the incumbent local exchange carrier in support of the synchronous optical network (SONET) architecture. It was sufficient at one time to simply state that dark fiber was fiber that was laid and left dark, i.e., without "any" equipment on it to light it up. In this sense, 'dark' fiber which is dormant, was distinguished from 'lit" fiber, which was active. Today, however, the term 'dark' has also come to mean, in a much looser sense, the fiber that is placed in the ground by competitive carriers like MFNX and delivered to users even when it "is" equipped with opto-electronics such as dense wavelength division multiplexers (DWDMs), optical add-drop muxes (OADMs), optical switches and routers, etc. What makes it "dark," these days, is the fact that it doesn't support the ILEC's SONET, to net it out. Comments, corrections are welcome. FAC