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Is there any difference between wifi , wimax and wireless mesh technology?

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Is there any difference between wifi , wimax and wireless mesh technology?

pakkyd10
how is the mesh technology used in wifi and wimax ? is it popular now -a-days and are there any present case studies available ? can a comparative study be done on wimax, wifi and wireless mesh technology?

thanks in advance :)
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    OH Smeg

    Exactly the same way in each if the architect has done their job correctly.

    is it popular now -a-days and are there any present case studies available ?

    No it isn't but these are still early days.

    For Case Studies I would suggest Google

    As for the rest of your question this would best be addressed by reading the relevant Text Book for the course you are doing.

    Col

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    pakkyd10

    Thanks a lot for the reply :)
    Just one more thing if u think mesh technology can be used in wifi and wimax in a similar manner then is der any chance of comparing the way the mesh technology is actually implemented in both of them...i mean are there enough points that differentiate the way the mesh tech is used in both of dem ? or is it useless doing such comparisons?


    Thanks in advance :)

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    1 Votes
    robo_dev

    Mesh topology with WiFi is not used all that often; you typically see it in large Metro area WiFi installations or very large enterprise installations.

    Often, the word 'mesh' is somewhat a misnomer, as the fact that a WiFi access point has a second radio for the WAN connection is often just deployed as a low-cost way to connect the unit to the Internet or back to the enterprise WAN.

    Sometimes the way this is done inside the enterprise, would be using Access Points with two radios of very different standards, thus a 802.11g radio at 2.4GHZ would be used for the client communication, and a 5GHZ 802.11a radio would be used for the mesh, or really simply to replace the cost and complexity of having to run an ethernet cable for each access point in a large warehouse or facility. Where the mesh comes into it is because you need to coordinate things like nodes joining the network, devices moving between nodes, failure of nodes, etc.

    Overall, for all intents and purposes, the WAN side of the mesh devices is the same as an ad-hoc wireless network. In the case of a metro-area mesh network the access points are typically using broadband radio, such as GSM and there is some intelligence with respect to how the network connections are maintained (e.g. self-healing meshes and the like).

    WiMax, of course, promises to improve the speed of the mesh network and possibly lower the cost.
    http://en.wikipedia.org/wiki/WiMAX

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    pakkyd10

    thanks a lot for your reply :)
    however , i still feel a bit confused regarding the use of mesh technology in wifi and wimax...my seniors at work tell me that the mesh technology (here i mean the the topology, architecture etc of mesh) is used in wifi in a different way and for wimax in a different way...They say for wifi it is used both at the server side and the client side where as for the wimax it is used only at the server side ? So is dat true ?

    If yes , are there any other points on which they differ in their implementation of mesh technology ?
    If no , can u tell me what is done actually ?
    I am planning to write a technical ppr on the same (i.e wireless mesh technology
    ) and would appreciate if u could help me understand the topic in more detail

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    0 Votes
    robo_dev

    In general, the device to connect client devices to the WLAN are known as access points.

    An access point has two interfaces. In the beginning these were:

    LAN side.......Client Side
    Ethernet ---- 802.11b

    then some vendors created Access Points that could use WiFi for the LAN side as well. To confuse things, these are somewhat similar to the concept of a WLAN bridge:

    e.g.
    LAN side.......Client Side
    802.11b ---- 802.11b

    Fast forward a few years, and we get new technologies that are better and faster for the LAN side connection, such as 802.11a WLAN, offering a higher data rate at 5.4GHZ
    e.g.
    LAN side.......Client Side
    802.11a ---- 802.11b

    Now keep in mind that 802.11a or 802.11b are mostly used for short-range (~100 meter) connectivity.

    How then, would we hook up an Access Point to give WiFi to those in the town square?

    Well, you could setup a DSL circuit:

    LAN side ----- Client side
    DSL-Ethernet ------802.11b

    But that's costly and you need to run wires, so the next steps are:
    LAN side ----- Client side
    GSM or HSPDA ----- 802.11b / g

    Better, but GSM typically gives 1MBs at fairly high cost

    The promised LAN:

    LAN side ------------ Client side
    WiMax (IEEE 802.16) ------ 802.11b/g

    This gives the best of all worlds, as WiMax offers a speed faster than the DSL circuit, often 128MBS, with the convenience of GSM.

    http://en.wikipedia.org/wiki/WiMAX

    The whole 'mesh' concept is just how all these APs are hooked together and talk to each other.
    http://en.wikipedia.org/wiki/Wireless_mesh_network


    Remember WiMax is a carrier technology, like GSM or HSPDA. WLAN/WiFi is a LAN ethernet replacement.

  • +
    0 Votes
    OH Smeg

    Exactly the same way in each if the architect has done their job correctly.

    is it popular now -a-days and are there any present case studies available ?

    No it isn't but these are still early days.

    For Case Studies I would suggest Google

    As for the rest of your question this would best be addressed by reading the relevant Text Book for the course you are doing.

    Col

    +
    0 Votes
    pakkyd10

    Thanks a lot for the reply :)
    Just one more thing if u think mesh technology can be used in wifi and wimax in a similar manner then is der any chance of comparing the way the mesh technology is actually implemented in both of them...i mean are there enough points that differentiate the way the mesh tech is used in both of dem ? or is it useless doing such comparisons?


    Thanks in advance :)

    +
    1 Votes
    robo_dev

    Mesh topology with WiFi is not used all that often; you typically see it in large Metro area WiFi installations or very large enterprise installations.

    Often, the word 'mesh' is somewhat a misnomer, as the fact that a WiFi access point has a second radio for the WAN connection is often just deployed as a low-cost way to connect the unit to the Internet or back to the enterprise WAN.

    Sometimes the way this is done inside the enterprise, would be using Access Points with two radios of very different standards, thus a 802.11g radio at 2.4GHZ would be used for the client communication, and a 5GHZ 802.11a radio would be used for the mesh, or really simply to replace the cost and complexity of having to run an ethernet cable for each access point in a large warehouse or facility. Where the mesh comes into it is because you need to coordinate things like nodes joining the network, devices moving between nodes, failure of nodes, etc.

    Overall, for all intents and purposes, the WAN side of the mesh devices is the same as an ad-hoc wireless network. In the case of a metro-area mesh network the access points are typically using broadband radio, such as GSM and there is some intelligence with respect to how the network connections are maintained (e.g. self-healing meshes and the like).

    WiMax, of course, promises to improve the speed of the mesh network and possibly lower the cost.
    http://en.wikipedia.org/wiki/WiMAX

    +
    0 Votes
    pakkyd10

    thanks a lot for your reply :)
    however , i still feel a bit confused regarding the use of mesh technology in wifi and wimax...my seniors at work tell me that the mesh technology (here i mean the the topology, architecture etc of mesh) is used in wifi in a different way and for wimax in a different way...They say for wifi it is used both at the server side and the client side where as for the wimax it is used only at the server side ? So is dat true ?

    If yes , are there any other points on which they differ in their implementation of mesh technology ?
    If no , can u tell me what is done actually ?
    I am planning to write a technical ppr on the same (i.e wireless mesh technology
    ) and would appreciate if u could help me understand the topic in more detail

    +
    0 Votes
    robo_dev

    In general, the device to connect client devices to the WLAN are known as access points.

    An access point has two interfaces. In the beginning these were:

    LAN side.......Client Side
    Ethernet ---- 802.11b

    then some vendors created Access Points that could use WiFi for the LAN side as well. To confuse things, these are somewhat similar to the concept of a WLAN bridge:

    e.g.
    LAN side.......Client Side
    802.11b ---- 802.11b

    Fast forward a few years, and we get new technologies that are better and faster for the LAN side connection, such as 802.11a WLAN, offering a higher data rate at 5.4GHZ
    e.g.
    LAN side.......Client Side
    802.11a ---- 802.11b

    Now keep in mind that 802.11a or 802.11b are mostly used for short-range (~100 meter) connectivity.

    How then, would we hook up an Access Point to give WiFi to those in the town square?

    Well, you could setup a DSL circuit:

    LAN side ----- Client side
    DSL-Ethernet ------802.11b

    But that's costly and you need to run wires, so the next steps are:
    LAN side ----- Client side
    GSM or HSPDA ----- 802.11b / g

    Better, but GSM typically gives 1MBs at fairly high cost

    The promised LAN:

    LAN side ------------ Client side
    WiMax (IEEE 802.16) ------ 802.11b/g

    This gives the best of all worlds, as WiMax offers a speed faster than the DSL circuit, often 128MBS, with the convenience of GSM.

    http://en.wikipedia.org/wiki/WiMAX

    The whole 'mesh' concept is just how all these APs are hooked together and talk to each other.
    http://en.wikipedia.org/wiki/Wireless_mesh_network


    Remember WiMax is a carrier technology, like GSM or HSPDA. WLAN/WiFi is a LAN ethernet replacement.