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  1. #1

    Help Please - CPE220s, 5 buildings, no clear line of sight, daisy-chain?

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    Hello!


    Using only CP210s, I would like to propoagte an Internet connection from 1 'main' (POP) building to 4 other 'campus' buildings that are no more than 100 meters from the AP.


    Ideally, I would have the 1 CPE220 set in AP mode and beam the signal to the 4 others with the campus CPEs in client mode, however a clear line of sight exists only between the main and 1 of the campus buildings, however lines of sight exist between all the campus buildings.


    My questions are:


    1. Can I 'daisy-chain' the units in such a way that 'main' feeds 'campus1', 'campus1' feeds 'campus2', 2 to 3, and 3 to 4?


    2. In that configuration, would I require 2 CPEs per campus building; 1 in client and 1 in AP mode? Or could I get by with 1 CPE in a different mode (ie. repeater mode) that would act as both AP and client? In other words, would users be able to connect their WiFi devices to the CP210s in client mode, or will I have connect another AP to each CP210 client via RJ45?


    3. On the TP-Link site (http://www.tp-link.com/us/faq-1162.html) it states the coverage angle for the CP is only 60. Does that refer to the coverage area only between 2 CPEs acting in an AP-Client relationship, or does that coverage apply to regular (Smartphone, Tablet, Notebook, etc...) clients as well? If it is the former, can I expect some sort of 360 radius coverage in close (50m) proximity to the CPE AP?

    4. If they don't do 360 for connected devices, should I look into using additional (potentially 3rd) device per building that's an omni-directional AP?

    5. 100 meters shouldn't be a problem, right?

    6. I'm in Thailand and getting these units is a bit of a pain, so if I over-budget and get 12 of these, I shouldn't need more than that, right?

    7. Any other inputs on achieving my objective would be much appreciated!


    Thanks in advance!

    Cheers,
    Steve
    Last edited by fun_E_mahn; 10-02-2017 at 07:55.

  2. #2
    Members R1D2 is on a distinguished road
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    Quote Originally Posted by fun_E_mahn View Post
    1. Can I 'daisy-chain' the units in such a way that 'main' feeds 'campus1', 'campus1' feeds 'campus2', 2 to 3, and 3 to 4?
    Yes. Main building could be configured as AP, campus1/2/3 as repeaters and campus4 as client. But using repeater mode, each repeater will cut available bandwidth by half and therefore I would not recommend such "daisy-chain" configurations, especially b/c all repeaters would share the same channel. Also, I would use CPE510/520 instead of CPE210/220, since most often the 2.4 GHz band is overcrowded, which might decrease bandwidth even further.

    2. In that configuration, would I require 2 CPEs per campus building; 1 in client and 1 in AP mode? Or could I get by with 1 CPE in a different mode (ie. repeater mode) that would act as both AP and client? In other words, would users be able to connect their WiFi devices to the CP210s in client mode, or will I have connect another AP to each CP210 client via RJ45?
    Using 2 devices - one in client and one in AP mode connected by wire - would be the cleanest solution and even the only one if both neighboring CPEs are outside the 60 (or 45) of the CPE210 (or CPE510).

    3. On the TP-Link site (http://www.tp-link.com/us/faq-1162.html) it states the coverage angle for the CP is only 60. Does that refer to the coverage area only between 2 CPEs acting in an AP-Client relationship, or does that coverage apply to regular (Smartphone, Tablet, Notebook, etc...) clients as well? If it is the former, can I expect some sort of 360 radius coverage in close (50m) proximity to the CPE AP?
    No, there is no 360 coverage for a stable and useful signal outside the 60/45 area, that's why those numbers are given in the specs. Also you could see the signal from the backside of a CPE at short distances, it does not mean that it is useful for data transmission.The antenna's beam is directional and directional is not omnidirectional, even not "some sort of".

    Note that an omnidirectional antenna TL-ANT2410MO has been recently announced for the WBS210, which is a device similar to the CPE210, but it is not available in every country yet and using a WBS210 with this antenna will be more expensive than using CPEs. But if you decide to go with repeater mode, than you could use only one device at campus 1, 2 and 3 buildings.

    4. If they don't do 360 for connected devices, should I look into using additional (potentially 3rd) device per building that's an omni-directional AP?
    For omnidirectional outdoor coverage the EAP110-Outdoor would be suitable (or the WBS210 with TL-ANT2410MO as in answer to question 3). I recommend to use CPE510 for the backhaul and EAP110-Outdoor for distributing the signal locally. The EAP110-Outdoor can even cover an area of 100m, so you probably can reduce the number of EAP110-Outdoor to campus 1 and campus3 (but this depends on many other parameters you didn't mention such as the number of clients to be supported with a WiFi signal).

    5. 100 meters shouldn't be a problem, right?
    No, this distance is no problem for CPE210. Problems might be channel availability (limited AirTime) in the 2.4 GHz band, shared channels in repeater mode, interferences between all devices etc., all related to number of radios in this band.

    6. I'm in Thailand and getting these units is a bit of a pain, so if I over-budget and get 12 of these, I shouldn't need more than that, right?
    See answer to question 4: number of devices needed for stable coverage of such an area depends on many other parameters such as number of clients to be supplied with WiFi, indoor or outdoor coverage, interferences in the buildings if indoor etc.
    Last edited by R1D2; 10-02-2017 at 09:12.

  3. #3
    Thanks for the speedy reply!


    Sold on the CPE510. Last week when I checked, Amazon didn't ship it to Thailand, now it seems they do! As for omni antennas you mentioned, they're not available in Thailand, so I'll have to make do without them and go CPE510 (and EASP110) routes. :-(


    Instead of repeater mode, could I:


    - Have 1 CPE510 act as the AP from main.
    - Have 2 CPE510s at each campus building and a 3rd omni outdoor AP. 1 CPE as client to the preceding AP, and another as CPE AP to feed the next CPE client and the 3rd omni AP for the client devices at/in the campus building to connect to?


    I was thinking all 3 (per building) via RJ45, as follows: CPE Client --> CPE AP --> Omni AP?


    Is this possible?


    My thinking is that because the CPE's are directional, that whether I use repeater or AP/Client mode that I'd need an additional omni AP so clients could reliably connect in and around the proximity of each campus building. The only difference between the 2 modes is requiring 1 vs. 2 CPEs, right?


    Thoughts?

  4. #4
    Members R1D2 is on a distinguished road
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    Yes, correct. If the buildings are on the opposite of each other, you would need an AP<->Client pair for each link. If two buildings would be in the 45 area, you could also use Client<-->AP<-->Client for three buildings, but then bandwidth is shared (same as if you set up an AP at the main building and the middle CPE is acting as a repeater, whereas a repeater will decrease bandwidth further than in a Client/AP setup).

    To feed users in a reliable way, the EAP110-Outdoor should be used. But note that you can feed up to 25-40 users only per outdoor EAP depending on usage pattern/bandwidth demands, interferences, type of connections (802b/g vs. 802.11n) etc. See this thread for an in-depth discussion:
    http://forum.tp-link.com/showthread.php?100353-Gated-Community-Wifi-for-CCTV-and-hotspot

  5. #5

    Help Please CPE220s 5 buildings no clear line of sight daisy chain

    thanks for the help guys which double bull did u use i noticed they have a few on the site?


 

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