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Dear students,

A Graded Discussion Board for 'Data Communications (CS601)' will be opened on Tuesday 12 August, 2014 and it will be closed on Wednesday 13 August, 2014.

Discussion Topic

A well reputed organization wants to implement a communication network among its head office and three branches in a city. The communication technology should be able to serve with good quality of service (QoS) and reliability. The organization has to choose either Wi-Fi or WiMAX. In your opinion, which of the given technique is more suitable for such scenario? Give two proper reasons to support your answer in either case.

Read the following instructions carefully before sending your comments:

  1. GDB will have weight-age of 5% of your total subject marks.
  2. Your discussion must be based on logical facts.
  3. You should post your comments on the Graded Discussion Board & not on the Regular MDB. Both will run parallel to each other during the time specified above.
  4. Your comments should be relevant to the topic i.e. clear and concise (Maximum 5-7 lines answer).
  5. Books, websites and other reading material may be consulted before posting your comments. (Do not copy the material as it is.)
  6. No extra time will be given for discussion.
  7. You cannot participate in the discussion after the due date or through e-mail.

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Replies to This Discussion

Dear students,

 

A Graded Discussion Board for 'Data Communications (CS601)' will be opened on Tuesday 12 August, 2014 and it will be closed on Wednesday 13 August, 2014.

 

Discussion Topic

 

A well reputed organization wants to implement a communication network among its head office and three branches in a city. The communication technology should be able to serve with good quality of service (QoS) and reliability. The organization has to choose either Wi-Fi or WiMAX. In your opinion, which of the given technique is more suitable for such scenario? Give two proper reasons to support your answer in either case.

 

Read the following instructions carefully before sending your comments:

  1. GDB will have weight-age of 5% of your total subject marks.
  2. Your discussion must be based on logical facts.
  3. You should post your comments on the Graded Discussion Board & not on the Regular MDB. Both will run parallel to each other during the time specified above.
  4. Your comments should be relevant to the topic i.e. clear and concise (Maximum 5-7 lines answer).
  5. Books, websites and other reading material may be consulted before posting your comments. (Do not copy the material as it is.)
  6. No extra time will be given for discussion.
  7. You cannot participate in the discussion after the due date or through e-mail.

 

 

 

Solution:

                       Comparison Table:

Feature

WiMax
(802.16a)

Wi-Fi
(802.11b)

Wi-Fi
(802.11a/g)

Primary
Application

Broadband Wireless
Access

Wireless LAN

Wireless LAN

Frequency Band

Licensed/Unlicensed
2 G to 11 GHz

2.4 GHz ISM

2.4 GHz ISM (g)
5 GHz U-NII (a)

Channel
Bandwidth

Adjustable
1.25 M to 20 MHz

25 MHz

20 MHz

Half/Full Duplex

Full

Half

Half

Radio Technology

OFDM
(256-channels)

Direct Sequence
Spread Spectrum

OFDM
(64-channels)

Bandwidth
Efficiency

<=5 bps/Hz

<=0.44 bps/Hz

<=2.7 bps/Hz

Modulation

BPSK, QPSK,
16-, 64-, 256-QAM

QPSK

BPSK, QPSK,
16-, 64-QAM

FEC

Convolution Code
Reed-Solomon

None

Convolution Code

Encryption

Mandatory- 3DES
Optional- AES

Optional- RC4
(AES in 802.11i)

Optional- RC4
(AES in 802.11i)

Mobility

Mobile WiMax
(802.16e)

In development

In development

Mesh

Yes

Vendor
Proprietary

Vendor Proprietary

Access Protocol

Request/Grant

CSMA/CA

CSMA/CA

  

 

 

 

 

 

 

and for more check Wifi and WiMax comparison

on the different websites

also visit

www.wateen.com

WiMAX is similar to the wireless standard known as Wi-Fi, but on a much larger scale and at faster speeds. A nomadic version would keep WiMAX-enabled devices connected over large areas, much like today.s cell phones. We can compare it with Wi-Fi based on the following factors.
IEEE Standards:
Wi-Fi is based on IEEE 802.11 standard where as WiMAX is based on IEEE 802.16. However, both are IEEE standards.
Range:
Wi-Fi typically provides local network access for around a few hundred feet with speeds of up to 54 Mbps, a single WiMAX antenna is expected to have a range of up to 40 miles with speeds of 70 Mbps or more. As such, WiMAX can bring the underlying Internet connection needed to service localWi-Fi networks.
Scalability:
Wi-Fi is intended for LAN applications, users scale from one to tens with one subscriber for each CPE device. Fixed channel sizes (20MHz).
WiMAX is designed to efficiently support from one to hundreds of Consumer premises equipments (CPE)s, with unlimited subscribers behind each CPE. Flexible channel sizes from 1.5MHz to 20MHz.
Bit rate:
Wi-Fi works at 2.7 bps/Hz and can peak up to 54 Mbps in 20 MHz channel.
WiMAX works at 5 bps/Hz and can peak up to 100 Mbps in a 20 MHz channel.
Quality of Service:
Wi-Fi does not guarantee any QoS but WiMax will provide your several level of QoS.
As such, WiMAX can bring the underlying Internet connection needed to service local Wi-Fi networks. Wi-Fi does not provide ubiquitous broadband while WiMAX does.

WiMAX is similar to the wireless standard known as Wi-Fi, but on a much larger scale and at faster speeds. A nomadic version would keep WiMAX-enabled devices connected over large areas, much like today.s cell phones. We can compare it with Wi-Fi based on the following factors. IEEE Standards: Wi-Fi is based on IEEE 802.11 standard where as WiMAX is based on IEEE 802.16. However, both are IEEE standards. Range: Wi-Fi typically provides local network access for around a few hundred feet with speeds of up to 54 Mbps, a single WiMAX antenna is expected to have a range of up to 40 miles with speeds of 70 Mbps or more. As such, WiMAX can bring the underlying Internet connection needed to service localWi-Fi networks. Scalability: Wi-Fi is intended for LAN applications, users scale from one to tens with one subscriber for each CPE device. Fixed channel sizes (20MHz). WiMAX is designed to efficiently support from one to hundreds of Consumer premises equipments (CPE)s, with unlimited subscribers behind each CPE. Flexible channel sizes from 1.5MHz to 20MHz. Bit rate: Wi-Fi works at 2.7 bps/Hz and can peak up to 54 Mbps in 20 MHz channel. WiMAX works at 5 bps/Hz and can peak up to 100 Mbps in a 20 MHz channel. Quality of Service: Wi-Fi does not guarantee any QoS but WiMax will provide your several level of QoS. As such, WiMAX can bring the underlying Internet connection needed to service local Wi-Fi networks. Wi-Fi does not provide ubiquitous broadband while WiMAX does.

Possibly due to the fact both WiMAX and Wi-Fi are based upon IEEE standards beginning with 802. and both have a connection to wireless connection technology, comparisons between the two are frequent. Despite this, both standards are aimed at different applications.

WiMAX is a long range system, covering many kilometers, that uses licensed or unlicensed spectrum to deliver a point-to-point connection to the Internet from an ISP to an end user. Different 802.16 standards provide different types of access, from mobile (analogous to access via a cellphone) to fixed (an alternative to wired access, where the end user’s wireless termination point is fixed in location.)

Wi-Fi is a shorter range system, typically hundreds of meters, that uses unlicensed spectrum to provide access to a network, typically covering only the network operator’s own property. Typically Wi-Fi is used by an end user to access their own network, which may or may not be connected to the Internet. If WiMAX provides services analogous to a cellphone, Wi-Fi is more analogous to a cordless phone.
- See more at: http://www.goingwimax.com/what-is-the-difference-between-wifi-and-w...

WiMax, also known as IEEE 802.16, is a wireless digital communications system that is intended for wireless �metropolitan area networks�. WiMAX is also an acronym meaning "Worldwide Interoperability for Microwave Access (WiMAX)and is relatively new in terms of a standards initiative. WiMax is designed to extend local WiFi networks across greater distances, such as on a university campus. The WiFi/802.11 wireless local area, which is the network standard, is limited in most cases to only about 100 to 300 feet; however, Wimax can provide broadband wireless access for up to 30 miles for fixed stations and 3 to 10 miles for mobile stations. WiMax allows for more efficient bandwidth use, interference avoidance, and is intended to allow higher data rates over longer distances. The IEEE 802.16 standard defines the technical features of the communications protocol. The WiMAX Forum offers a means of testing manufacturer�s equipment for compatibility, as well as an industry group dedicated to fostering the development and commercialization of the technology. In the next five years, Wimax will have an enormous impact on the cellular markets, particularly that of third-world countries, as well as that of the United States. The cost-effectiveness of WiMax to that of preexisting systems is much higher. One application that can be used by cellular companies is WiMax�s ability to serve as a high bandwidth �backhaul� for internet or cellular phone traffic from remote areas back to an Internet backbone; WiMax may be an answer to reducing the cost of T1/E1 backhaul as well. The more recent Long Term Evolution (LTE) standard is a similar term describing a parallel technology to WiMAX that is being developed by vendors and carriers as a counterpoint to WiMAX. wifi wimax Possibly due to the fact both WiMAX and Wi-Fi are based upon IEEE standards beginning with 802. and both have a connection to wireless connection technology, comparisons between the two are frequent. Despite this, both standards are aimed at different applications. WiMAX is a long range system, covering many kilometers, that uses licensed or unlicensed spectrum to deliver a point-to-point connection to the Internet from an ISP to an end user. Different 802.16 standards provide different types of access, from mobile (analogous to access via a cellphone) to fixed (an alternative to wired access, where the end user�s wireless termination point is fixed in location.) Wi-Fi is a shorter range system, typically hundreds of meters, that uses unlicensed spectrum to provide access to a network, typically covering only the network operator�s own property. Typically Wi-Fi is used by an end user to access their own network, which may or may not be connected to the Internet. If WiMAX provides services analogous to a cellphone, Wi-Fi is more analogous to a cordless phone. What is 4G ? Although the term �4G� has been tossed around a lot in relation to WiMAX, the reality is that the International Telecommunications Union has not yet to define what �4G� actually means. According to most of telecommunication professionals, the main technologies that are associated with this position include WiMAX, Long Term Evolution (LTE) and Ultra Mobile Broadband (UMB). To better understand the nature of the players involved in so-called 4G technologies, Wikipedia provides some helpful definitions for LTE and UMB (for a definition of WiMAX, see above) : Ultra Mobile Broadband : An ultra fast technology that supports more than an order of magnitude increase in broadband data throughput rates to economically deliver IP-based voice, multimedia, broadband, information technology, entertainment, and consumer electronic services within most kinds of devices. A platform that supports several wireless services within a full mobility environment and thus differentiates itself from Wi-Fi, WiMAX, UWB, etc. Ultra high-speeds that are in the order of 100s of megabits per second; next-generation capabilities, beyond 3G. Long Term Evolution : 3GPP LTE (Long Term Evolution) is the name given to a project within the Third Generation Partnership Project to improve the UMTS mobile phone standard to cope with future requirements. Goals include improving efficiency, lowering costs, improving services, making use of new spectrum opportunities, and better integration with other open standards. The LTE project is not a standard, but it will result in the new evolved release 8 of the UMTS standard, including mostly or wholly extensions and modifications of the UMTS system. What is the Wimax Forum ? The WiMAX Forum has more than 500 members comprising the majority of operators, component and equipment companies in the communications ecosystem. is an industry-led, not-for-profit organization formed to certify and promote the compatibility and interoperability of broadband wireless products based upon the harmonized IEEE 802.16/ETSI HiperMAN standard. The founding members of the WiMAX Forum committed themselves early to the process of creating a collaborative standards body. The WiMAX Forum has organized a number of working groups to address critical areas of focus in bringing WiMAX Forum Certified products to the marketplace. Here are some of the working groups : * Application Working Group (AWG) * Certification Working Group (CWG) * Evolutionary Technical Working Group (ETWG) * Global Roaming Working Group (GRWG)

see the attachment

Attachments:

Thank u 

So WiMax, Wifi is only for limited range right, Wimax he hoga if they want alot of area to be covered in city.

 But something is difficult here, connection between cities will be different not wimax, so if its offices it can be wifi with multiple points in office.

The bandwidth and range of WiMAX make it suitable for the following potential applications:

  • Providing portable mobile broadband connectivity across cities and countries through a variety of devices.
  • Providing a wireless alternative to cable and digital subscriber line (DSL) for "last mile" broadband access.
  • Providing data, telecommunications (VoIP) and IPTV services (triple play).
  • Providing a source of Internet connectivity as part of a business continuity plan.
  • Smart grids and metering

Yes answer is WiMax as Three branches are in same city. 

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