The edge of the optical network has multiple definitions, but it can be somewhat defined as the interface between the core and the customer. The type of service provider also has some bearing on the definition of this particular network region because their responsibilities vary depending where they sit in the pantheon of network operators. In the following section, we will examine the major operators and their views of the network. First, however, we should describe the nature of the device that performs the optical edge function. It is typically a device that performs add-drop multiplexing (ADM) capability, multichannel transport through the use of DWDM, and some form of switching and/or routing. It must offer capacity that is at least equivalent to the bandwidth in a single DWDM lambda, typically 2.488 Gbps. This may provide a sticking point for some customers: ATM is one of the most widely transported protocols over SONET and SDH networks. ATM chipset manufacturers, however, typically build their devices to operate no faster than 622.08 Mbps. This clear disconnect could pose serious problems for operators looking to interface the two efficiently. It is, however, being addressed as awareness is very high.

Let s consider now the companies in the telecommunications industry that are most affected by this evolving technology model. They include the Incumbent Local Exchange Carriers (ILECs), the Competitive Local Exchange Carriers (CLECs), the Interexchange Carriers (IXCs), the Bandwidth Barons, the Internet Service Providers (ISPs),...