WAN technologies

Question 1

T1

Answer 1

T1 circuits were originally used in telephony networks, with the intent of one voice conversation being carried in a single channel
T1 circuit combines 24 DS0s into a single physical connection to offer 1.544 Mbps of bandwidth

Question 2

E1

Answer 2

E1 circuits contain 32 channels, Only 30 of those 32 channels, however, can transmit data (or voice or video).

Question 3

T3

Answer 3

T3 circuit offers an increased bandwidth capacity.
T3 circuit combines 672 DS0s into a single physical connection, which is called a Digital Signal 3 (DS3).
T3 circuit has a bandwidth capacity of 44.7 Mbps.

Question 4

DS(digital signal)

Answer 4

DS1 is synonymous with T1. DS3 and T3 are synonymous

Question 5

OCx

Answer 5

A system that defined data rates in terms of Optical Carrier (OCx) levels

Question 6

SONET(Synchronous Optical Network)

Answer 6

fiber-optic WAN technology that delivers voice, data, and video at speeds starting at 51.84Mbps.
Its a Layer 1 technology
It can be used to transport various Layer 2 encapsulation types, such as Asynchronous Transfer Mode (ATM)

Question 7

Back Bone(Core Layer)*****

Answer 7

AT&T…Internet sevice Provider

Question 8

SDH(Synchronous Digital Hierarchy)

Answer 8

fiber-optic multiplexing standard.
used synonymously with SONET used world wide
Not so widley used in America as SONET mostly used worldwide.

Question 9

DWDM(dense wavelength division multiplexing)

Answer 9

high-speed optical network commonly used in MANs.
The main components of a DWDM system include the following: .
Terminal multiplexer .
Line repeaters .
Terminal demultiplexer

uses as many as 32 light wavelengths on a single fiber, where each wavelength can support as many as 160 simultaneous transmissions

Question 10

Salellite

Answer 10

viable Internet access solution for those who cannot get other methods of broadband.

Question 11

ISDN(Integrated Services Digital Network)

Answer 11

alternative to the slower modem WAN connections

ISDN enables the transmission of voice and data over the same physical connection.

Question 12

Cable

Answer 12

Access provided by cable companies

Question 13

DSL(digital subscriber line)

Answer 13

high-speed data transmission over existing telephone wiring
group of technologies… has data rates and distance limitations.(unequal upstream and downstream speed)
A DSL filter works by minimizing this interference, making for a faster and cleaner DSL connection.
Symmetric DSL (SDSL):upstream and downstream speeds.
Very High Bit-Rate DSL (VDSL): boasts a much higher bandwidth capacity than ADSL or SDSL

Question 14

Cellular-WAN

Answer 14

Tethering allows a smart phone’s data connection to be used by another device, such as a laptop.

Question 15

WiMAX(Worldwide Interoperability for Microwave Access)

Answer 15

Wireless Broadband for small countries

Question 16

LTE(Long Term Evolution)

Answer 16

fourth generation in a long series of products offering similar services.(4G) Upload 50Mbit/s Downloads100Mbit/s

Question 17

HSPA+(High-Speed Packet Access )

Answer 17

a technology offering wireless broadband service.

Question 18

Fibre

Answer 18

is well suited for high-speed data WAN communication

Eliminates near-end crosstalk, EMI, and signal tampering.33

Question 19

Dialup

Answer 19

Using the PSTN(Public Switched Telephone Network) to establish WAN connections.
it’s difficult to share large files or videoconferencing because it is slow

Question 20

PON(passive optical network)

Answer 20

Use fiber cable-This is made possible via unpowered (that is, passive) optical splitters.

Question 21

ATM(Asynchronous Transfer Mode)

Answer 21

a Layer 2 WAN technology that operates using the concept of PVCs and SVCs

• packet-switching technology
• is a circuit-based network technology; uses a virtual circuit to connect two networked devices.

Question 22

WAN Tech Properties

Answer 22

• Circuit Switch: dynamically brings up a dedicated communication link between two parties
• Packet Switch:messages are broken into smaller pieces called packets.(Each packet is assigned source, destination, and intermediate node addresses.)

Datagram packet switching: datagram
packet switching are independently sent, meaning that they can take different paths through the network to reach their intended destination.

Virtual-circuit packet switching: A logical connection is established between the source and the destination device.
The logical communication path between the two devices can remain active for as long as the two devices are available or can be used to send packets once. After the sending process has completed, the line can be closed

• Speed:
• Transmission Media
• Distance