Chapter 2 - Wide Area Networks (WANs) Flashcards Preview

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Flashcards in Chapter 2 - Wide Area Networks (WANs) Deck (37)
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1

WAN

Wide Area Network

2

Typical WAN data transfer rate

1.5 Mbps to 6 Mbps

3

PSTN

Public Switched Telephone Network

4

ISP

Internet Service Provider

5

How are analog signals measured?

In cycles per second, or Hertz.

6

Hare are digital signals measured?

In bits per second (bps)

7

bps

bits per second

8

CO

Central Office

9

Local Loop

The analog portion of voice circuit between the Central Office (CO) and the subscriber.

10

DSO

Digital Signal Level Zero

11

Digital Signal Level Zero (DSO)

The basic level of digital communication upon which all other digital signaling levels are built.

12

Multiplexing

The process of combining several sets of signals onto a high-bandwidth transmission.

13

Channel

A path for communication between two devices.

14

Broadband

A transmission method in which the media bandwidth is allocated to multiple channels and each channel carries a separate signal.

15

Baseband

LAN transmission methods using digital signals at speeds of 2 to 100 Mbps.

16

Mbps

Megabits per second

17

TDM

Time Division Multiplexing

18

FDM

Frequency Division Multiplexing

19

Two multiplexing technologies in use today:

Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM)

20

DSH

Digital Signal Hierarchy

21

Digital Signal Hierarchy (DSH)

A hierarchy established in North America to classify the speed capacity of multiplexing lines.

22

What are the 5 Digital Signal Levels of the DSH?

DS0, DS1, DS2, DS3, & DS4

23

Circuit switching

A technology that uses dedicated physical path to send and receive information.

24

Patch switching

A technology that places addressing information into data packets, instead of relying upon a dedicated physical path.

25

Name 4 circuite-switching WAN technologies

Plain Old Telephone Service (POTS), T1/E1, T3/E3, & ISDN.

26

PADs

Packet assemblers/disassemblers

27

Virtual circuits

A path between hosts that appears to be a discrete dedicated connection when in fact it is not. Describes connections between hosts in a packet-switching network.

28

Name 4 packet-switching WAN technologies

Digital Subscriber Line (DSL), Cable modem, SONET, & ATM.

29

modem (technical name for it)

modulator/demodulator

30

What is a modem?

An analog device that enables computers to communicate over telephone lines by translating digital data into audio/analog signals (on the sending computer) and then back into digital form (on the receiving computer).