Synchronous fiber optic networks use multiplexed channels on synchronous circuits. This configuration provides a way to accurately know which particular channel the frame is located on and which frames can be fetched without shunting all of the multiplexed signals. In this way, there are different types of channels (low speed and high speed) on the network, and users can make a variety of routing options. The following DOME Fiber Closure manufacturers share the auxiliary operations for sharing SONET signals including the following sections: Segmentation assist operations handle frame generation and error monitoring. This feature will be used by all devices on the line. Line assist operations are used to monitor line status. Path assisted operations are used to control signal transmission and error monitoring between network endpoints.