The need for switching systems and their evolution from analogue to digital so1

After this lesson you will be able to

1. Discuss and historical map in context the transition from an analogue to digital PSTN environment
2. Explain according to telecommunication theory the call set-up process from the moment the handset is off-hook, until the call is completed is explained .
3. Describe the network hierarchy in terms of the impracticability to connect all subscribers together with reference to telecommunication theory.
4. Describe according to telecommunication theory the routing of a call between two subscribers by the recognition of codes and subscriber number allocation.

VIDEO LESSON

Please watch and listen to the following video lesson. For more details please read pages 9-16 of your Learner guide.