Optical Network Design and Implementation

Circuit-Switched Networks

Figure 2-7 shows an example of a circuit-switched network from a customer's perspective. Such a topology is also referred to as a point-to-point line or nailed-up circuit. Typically such lines are leased from a local exchange carrier (LEC) or IXC and are also referred to as leased lines. One leased line is required for each of the remote sites to connect to the headquarters at the central site.

Figure 2-7. Leased Lines from a Customer Perspective

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The private nature of leased line networks provides inherent privacy and control benefits. Leased lines are dedicated, so there are no statistical availability ...