[*] As shown in above figure PSTN Switch consists of interface, Switching and call
control. All the functional entities are shown in one box that means they are
interacting with each other using proprietary protocol. Where as in NGN model
entities are interacting using standard protocols.
[*] In PSTN each node should have call control separately whereas NGN may have
centralised call control
[*] PSTN is dedicated network for providing voice services to the subscribers whereas
NGN is developing with the idea of carrying all kind of traffic over it.
[*] PSTN is working on circuit switched principle whereas NGN is working on Packet
switching.
[*] PSTN provides excellent quality of voice and it is tested in all conditions whereas
NGN will provide good quality of voice and it is to be tested in adverse network
conditions.
[*] In PSTN service integration is very difficult and because of vendor dependent
technologies, it is difficult to introduce services easily. Whereas NGN shall be able to
provide separate service platform for introduction of services without depending upon
underlying network related technologies.
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