WAN Technologies

T1/E1 and T3/E3/DS3:

1. A T1 line employs what type of multiplexing?

Time-Division multiplexing.

2. With what type of media does a T1 line most likely use when it enters a building?

Twister pair.

3. With what type of media would a T3 likely use when it enters a building?

Coax (BNC connectors)

Satellite, ISDN, Cable, DSK, and Dialup:

1. How does the cost of non-terrestrial communications compare with conventional terrestrial networking?

It is a lot more expensive than a conventional terrestrial networking.

2. Other than cost, what is the significant disadvantage of satellite communications?

They’re high in latency.

The communication will be affect in the bad weather condition such as thunderstorm (rain fade).

3. What does the A in “ADSL” represent?

The A stands for asymmetric.

4. What type of media would an ADSL use when it enters a building?

It uses telephone lines.

5. What type of DSL is capable of speeds of up to 100Mbit/s?

VDSL – very high bitrate DSL

Circuit Switching and packet Switching:

1. Which technology, circuit or packet switching, is most like the technology utilized by POTs?

Circuiting Switching.

2. What is the major criticism of circuiting switching?

It is inefficient use of resources because you own your own circuit, and the connect ion is always there.

3. Why is packet switching consider more efficient then circuit switching?

The media is usually shared. People can use it even when you don’t.

Transmission media, Speed and Distance:

1. What are the three major WAN cable types?

Coax, twisted pair, fiber.

2. When was coax cable patented?

1880

3. What type of cable is typically used in a local area network?

Twisted-pair copper.

4. What purpose does the twist in TWP copper cable serve?

It is built-in electromagnetic interference cancellation.

5. What type of cabling would you use for very long distance and very high speed runs?

Optic fiber. Kilometers at high speeds.

6. When you use fiber optic cables, what are two conventional cabling operations that require extra care?

You need to watch the bend radius and terminate it properly.