PSTN is the global collection of interconnects originally designed to support circuit switched voice communication. The PSTN provides traditional Plain Old Telephone Service (POTS), also known as “landline phone” service , to residences & many other establishments. Parts of the PSTN are also utilized for DSL, voIP & other Internet based network technologies.

1. PSTN
(Public Switched
Telephone Networks)
CREATED BY – RAHUL DAREDIA

2.  PSTN is the global collection of interconnects originally
designed to support circuit switched voice
communication.
 The PSTN provides traditional Plain Old Telephone
Service (POTS), also known as “landline phone”
service , to residences & many other establishments.
 Parts of the PSTN are also utilized for DSL, voIP &
other Internet based network technologies.
CREATED BY – RAHUL DAREDIA

3. DSL (Digital Subscriber line) VoIP(Voice Over IP)
CREATED BY – RAHUL DAREDIA

4.  One PSTN link supports 64 kilobits per
second(kbps) of bandwidth for data.
 In residences, the PSTN phone line typically carries
this bandwidth over a copper cable.
 Traditional dial-up network modems utilize nearly
56 kbps of this bandwidth when connected to a
phone line. The PSTN utilize the SS7 signaling
protocol.
CREATED BY – RAHUL DAREDIA

5.  The public switched telephone network(PSTN) is the
aggregate of the world ‘s circuit switched telephone
networks that are operated by national, regional , or
local telephone operators , providing infrastructure &
services for public telecommunication.
 The PSTN relies on circuit switching. To connect one
phone to another , the phone call is routed through
numerous switches operating on a local, regional,
national or international level.
CREATED BY – RAHUL DAREDIA

6.  In the early days, phone calls traveled as analog
signals across copper wire.
 Every phone call needed its own dedicated copper
wire connecting the two phones.
 That ‘s why you needed operators assistance in
making calls.
 The operators sat at a switchboard, literally
connecting one piece of copper wire to another so
that the call could travel across town or across the
country.
CREATED BY – RAHUL DAREDIA

7.  Long-distance calls were comparatively expensive,
because you were renting the use of a very long piece
of copper wire every time you made a call.
 Beginning in the 1960s, voice calls began to be
digitized & manual switching was replaced by
automated electronic switching.
 Digital voice signals can share the same wire with
many other phone calls.
 The advent of fiber-optic & other high-bandwidth
cables haven’t changed the basic nature of circuit
switching, which still requires a connection or circuit
to remain open for the length of the phone.
CREATED BY – RAHUL DAREDIA

8. CREATED BY – RAHUL DAREDIA

9. CREATED BY – RAHUL DAREDIA

10. https://www.youtube.com/channel/UC8lHcGdQfZ3T7dL0frVYvsQ/fe
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