A method of creating physical links between the enichiting and receiving points.




Public switch telephone network offerces two types of services.

1. DILT-UP SERVICES: The customer pays on per-use bases.

2. LEASED DETECATED SERVICES: The customer is geranted exclusive access.

The PSTN maintains large numbers of path but not nearly enough to service all customers simultaneously. When a customer request, a path is switch in to the service which customers need. When the customer hangs up, the path is reused by another customer for other customers.


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