How Circuit-Switching Digita
l Networks Work
Group Web Presentation: Week 11
Member
s1160152, s1160153, s1160154, s1160155

About Circuit-Switched Digit
al Networks I
⇨ The central office switch have Digit
al access equipment.
⇨ ISDN can do fast-call setup.
⇨ The dial-up router finds destination
and call selected from a preprogramm
ed table.

About Circuit-Switched Digit
al Networks II
⇨ Every central office is a computerized
switch to route and complete call that
comes from circuit switching.
⇨A switching matrix connects local acces
s lines and long distance services.

About Circuit-Switched Digit
al Networks III
⇨ The CO switch accepts the incoming call a
nd makes a digital connection to the dest
ination.
⇨ The destination router senses the incomin
g call and makes a connection to the LAN.
⇨ The originating router strips off the Eth
ernet data and sends TCP/IP packets acros
s the LAN-to-LAN connection.
⇨ Client devices on each LAN can access ser
vers and services on the other network,bu
t with reduced speed.

Conclusion
⇨ Central Office is very useful.

Key terms
⇨ Central office switch
⇨ Circuit Switching
⇨ LAN,TCP/IP,the CO,client

Questions
⇨ Q:What does the dial-up router select a
destination by?
⇨ A:A preprogramed table.
⇨ Q:What is switch's role?
⇨ A:To route and complete call.
⇨ Q:Does the CO switch accept the incoming
call ?
⇨ A: Yes,it does.