One network layer exists between the user and the service access points. Customers can be guaranteed control of bandwidth. See Topic 6 . Scalability in capacity is allowed from 512 kbps to transmission speeds close to the utilization of the fiber. Isolated synchronous channels are provided.
Channels are multidirectional.
Billing per usage of resources is possible. See Topic 8 . Circuit Switching vs. Packet Switching 3. Frames and Slots 5. DTM Services 6.