Question

Consider the following statements for public circuit-switching network:

1. Private branch exchange (PBX) is an application of circuit switching.

2. A switching centre that directly supports subscribers in known as digital PBX.

3. The link between the subscriber and the network, is also referred to as the local loop.

Which of the above statements are correct?

1. 1 and 2 only
2. 1 and 3 only
3. 1, 2 and 3
4. 2 and 3 only
5.

Answer 1

Correct Answer - Option 1 : 1 and 2 only

circuit switching is a method of implementing a telecommunication network in which two network nodes establish a dedicated communication channel (circuit) through the network before the nodes may communicate.

A local loop is a wired connection from a telephone company's central office with integrated services digital network (ISDN) or digital subscriber line (DSL) (option 3 is wrong)

A private branch exchange is a telephone system within an enterprise that switches calls between users on local lines while enabling all users to share a certain number of external phone lines.PBXS can include network switching systems that accommodate analog phones into the enterprise's digital PBX system. (option 1 is correct)

Private branch exchanges used analog technology originally. Today, PBXs use digital technology -- digital signals are converted to analog for outside calls on the local loop using plain old telephone service (POTS). A switching centre that directly supports subscribers is known as digital PBX.(option 2 is correct)