Tdc 461 basic communications quiz 3 name

NAME______________________________

a) they are inherently less susceptible to noise.

b) their high speed makes them pick up less noise.

c) they are transmitted at a much higher voltage.

d) they are regenerated instead of re-amplified.
2) The disadvantage(s) of a 1A2 key telephone systems is/are:

a) 1A2 is electromechanical and requires routine maintenance;

b) 1A2 is difficult for the users to understand;

c) 1A2 has a limited set of features;

d) 1A2 uses heavy bulky wiring;

e) all of the above

(mark all that apply)

a) use a microprocessor to control system functions;

b) are better than PBX for system under 400 stations;

c) use more electricity than 1A2 key systems;

d) are always cheaper than 1A2 key;

e) have less flexibility than 1A2 and digital PBX.
4) A hybrid telephone system is one that:

a) combines features of PBX and Centrex.

b) combines features of a PBX and electronic key systems.

c) use both AC and DC current.

d) is usually implemented using all single line phones.

e) is able to switch calls in both analog and digital form.

7) A digital PBX uses only digital access lines to connect to the CO.

True / False

8) Modern PBX features are implemented using:

(mark all that apply)

a) Central Office provided intelligence;

b) one or more microprocessors;

c) Stored Program Control;

d) only digital station sets.
9) Explain in your own words what a Time Slot is:
10) Most modern PBX do not use attendant consoles.

True / False

(mark all that apply)

a) always sound better than an analog PBX;

b) must be programmed by the user in a high level language;

c) can pass a limited number of analog signals through the switching matrix;

d) is the only type PBX which uses time division multiplexing;

e) none of the above
13) In a PBX using Automatic Route Selection, the second dial tone that the user hears after dialing the digit “9” is the Central Office dial tone.

True / False

True / False

16) Direct Inward Dialing is accomplished by putting Centrex lines in behind a PBX.

True / False