LESSON 1.3B 98-366 Networking Fundamentals

UnderstandingUnderstanding WideWide AreaArea NetworksNetworks LESSON 1.3B 98-366 Networking Fundamentals Lesson Overview

In this lesson, you will learn about:

ƒ T1

ƒ T3

ƒ E1

ƒ E3

ƒ DSL

ƒ Cable and its characteristics (speed, availability) LESSON 1.3B 98-366 Networking Fundamentals

Anticipatory Set

ƒ Pass sample cables around the class. Share with another student and answer if and where you have seen these cables before.

ƒ Review how a LAN would be designed for the classroom. How do you imagine the design for a WAN is different? LESSON 1.3B 98-366 Networking Fundamentals T1

ƒ A high-speed communications line that can handle digital communications and Internet access at the rate 1.544 Mbps (megabits per second).

ƒ This high-bandwidth telephone line can also transmit text and images.

ƒ Speed is attained through multiplexing 24 separate 64 Kbps channels into a single data stream.

ƒ Commonly used by larger organizations for Internet connectivity. LESSON 1.3B 98-366 Networking Fundamentals T3

ƒ A T-carrier that can handle 44.736 Mbps (megabits per second) or 672 voice channels. LESSON 1.3B 98-366 Networking Fundamentals E1

ƒ A 2.048 Mbps point-to-point dedicated, digital circuit provided by the telephone companies in Europe.

ƒ The European counterpart of the North American T1 line.

ƒ E1 and T1 lines can be interconnected for international use.

ƒ Uses two wire pairs (one for transmit, one for receive) and time division multiplexing (TDM) to interleave 32 64- Kbps voice or data channels. LESSON 1.3B 98-366 Networking Fundamentals E3

ƒ A carrier service with capacity for 34.368 Mbps

ƒ The E3 lines is the European counterpart to the US T3

ƒ Europe has a counterpart for every T-carrier leased line capability

ƒ A speed capacity of 34.368 Mbps

o Interesting since E1 is faster than a T1 and E2 is faster than a T2 but E3 is slower than a T3

ƒ E2 through E5 lines provide multiple E1 channels LESSON 1.3B 98-366 Networking Fundamentals

DSL - Digital Subscriber Line

ƒ Provides high-speed transmissions over standard copper telephone wiring

ƒ The data throughput of consumer DSL services ranges from 384 Kbps to 20 Mbps in the direction to the customer

o Depends upon technology, line conditions, and service-level.

ƒ The data throughput in the reverse direction—from customer to the service provider—is lower

o Asymmetric digital subscriber line (ADSL) is the most common DSL service provided but still with limited availability

o Symmetric digital subscriber line (SDSL) provides equal speed in both directions LESSON 1.3B 98-366 Networking Fundamentals

Cable Internet Access through CATV

ƒ Has become a viable alternative and many cable companies are offering both a home and a business- class connection. LESSON 1.3B 98-366 Networking Fundamentals Reflection – Class Activity

1. With a partner discuss the similarities and differences between T1, T3, E1, E3.

2. Create a table showing the similarities and differences.

3. Indentify North American (T-carrier) and European (E- carrier).

4. Include such items as number of lines, number of channels, & max data rate.

5. Discuss why such ranges exist and describe situations that would require the various options.