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To: Doughboy who wrote (2284)	11/3/1998 11:57:00 PM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 12823

DougHboy, by going directly to the glass, they are referring to sending IP traffic directly onto the physical medium, the glass, without first going through the usual steps of sending it to Layers 2, and then to Layer 1. Normally, TCP/IP packets (Layers 4/3) are first mapped to a Layer 2 protocol such as Frame Relay [frames] or ATM [cells], and then the Layer 2 Frame or Cell is mapped to a Sonet tributary (e.g., a T-1 or T3) through a convergence process. Then it is pushed down to the photonic sublayer (the glass, or wavelengths supported by the glass). In other words, they will take a short cut and use optical drivers that map the IP payload directly to the optical medium, thus eliminating a considerable amount of network hardware costs as well as other forms of traditional network overhead. HTH, Frank Coluccio