capter 16 Flashcards Preview

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Flashcards in capter 16 Deck (25):
1

what is Customer premises equipment (CPE)?

577

Customer premises equipment (CPE) is service provider equipment that is located on the customer's premises (physical location) rather than on the provider's premises

2

what is channel service unit / Data service unit ( CSU/DSU)

577

A layer 1 device that performs both the channel service unit (CSU) and data service unit (DSU) functions. it connects the serial ports on the customer's router to the provider's network

3

smart jack/ NIU
578

it is installed between the demarcation and the CSU/DSU, it convert codes and protocols into something the customer's equipment required.

4

central office ( CO )
579

is a phone company that connect the customer network to the provider's switching network.

5

3 types of WAN connection, what are they?

580

-dedicated lines ( leased)
- Circuit switching
-Packet switching

6

dedicated lines ( leased)

580

it is a point to point, it uses synchronous serial lines up to 45Mbps, uses high level data link Control ( HLDC ) and Point to point protocol ( PPP )

7

Circuit switching

581

low cost, uses dial-up modems or ISDN, it is used for low-bandwidth data transfers.

8

Packet switching

581

this method allows the user to share bandwidth with other users to save money, but it is very slow.

9

what is the slowest WAN connection?

581

dial-up connection is the slowest.

10

what is the sped of modern dial-up modems?
581

the theoretical speed is 56Kbps.

11

what is Synchronous transmission?

Synchronous transmission is a process where data is transferred in regular intervals that are timed by a clocking signal; allowing for a constant and reliable transmission for time-sensitive data, such as real-time video or voice.

12

what is asynchronous?

asynchronous is a data transmission where the communication can start and stop at any time. Data sent through an asynchronous transmission contains a start bit and stop bit, helping the receiving end know when it has received all of its data.

13

what are T series connections?

582

they are digital connection that we can lease from the telephone company, we use them for leased lines that provide synchronous connection between sites.

14

T1 is the basic of the T series connections, it serves 24 digital signal 0 ( DS0). what is the maximum speed of T1?
582

1.544 Mbps

15

what is synchronous optical network ( SONET)

585

is the standard of synchronous data on optical fiber

16

what is the European version of the T1?
583

it is E1, and it operates at 2.048 and uses 32 channels of 64Kbps. uses DS1

17

what is the Japanese version of T1?
583

it is J1, it operates at 1.544Mbps

18

The T3 connection:
584

it is a 44.736Mbps = 28T1 and 672DS0 channels.
uses DS2

19

Wavelength Division Multiplexing, WDM :

585

Wavelength Division Multiplexing, WDM is a technology that multiplexes several carriers on a single optical fiber by using different wavelengths.

20

what is PON ?

586

A passive optical network (PON) is a new option for network connecting home and business to the internet, it uses point-to-multipoint fiber to the end-points in which unpowered optical splitters are used to enable a single optical fiber to serve multiple end-points.

21

what is the downlink and the uplink speed of the PON?
586

downlink is from 155Mbps to 655Mbps.
the uplink speed is 155Mbps

22

what are some of the wireless types?

586

Bluetooth.
Microwave radio relay.
A communication satellite.

23

Microwave radio relay transmit digital and sometime analog signals. T/F
787

True

24

DSL:


588

Digital Subscriber Line, DSL is a method of having high-speed access to the Internet over standard copper lines.
the digital information is sent over a high bandwidth channel above the baseband voice channel on a single pair of wires.

25

Cable modems:

588

this broudband service sends Ethernet digital signals over a cable modem.