Multiple WAP based WLAN - are both Antennas 802.11g ??

Posted on 2007-10-01
Last Modified: 2013-11-09
Hi Guys,
I'm deploying a wireless LAN in an old house, lots of thick walls and have opted for a number of Wireless access points to provide internal and external coverage. There will be two external areas separated by the house and three other WAPs to provide futher internal coverage. I'd like to know two things.
1. I'm considering the Netgear WAG102 which has dual antennas. Do both of these support 802.11g so that if I replace one of the stub antennas with an external one this will leave the remaining antenna for indoor receiption. The Netgear specifications are not clear on this and I 'd like clarification. There spec could be read that one is for 2.4Ghz and one for 5Ghz (I'm not a radio technician but I thought this might be the case)

2. I don't need the coverage to be 'roaming free' so have not opted for a managed WLAN. How tolerant are these WAPs to interference and should I deploy with some channel separation or use the same channel and security for all units.

I have deployed single WAP WLANs but never a multiple WAP based WLAN, I'd appreciate any comments on the above.

Question by:TrevorWhite
    LVL 4

    Accepted Solution

    1) The WAG102 appears not to support antenna diversity - this means that one actually is pure 2.4GHz 802.11b/g transmit and receive, and the other is pure 5GHz 802.11a.  So you could have 5GHz 802.11a for outdoors (5GHz absorbs into walls and ovstruction more easily - so save it for the outdoors!), and 2.4GHz for indoors.

    2) Definately use separated channels for 2.4GHz 802.11b/g, using channels 1, 6, and 11 mean there's no overlap.  You could also use channels 2/7/12 or 3/8/13.  For 802.11a, the channels are fully separated already - so just pick different numbers.
    Use the same SSID on all, and see how that goes!

    By the way, antenna diversity is when one antenna transmits - but either one is used to receive, depending on which one gets the best signal.  This helps to avoid 'dead spots'.  WAG102 doesn't seem to support this, though.

    Best of luck!
    LVL 4

    Expert Comment

    Hi Trevor,
    How's the planning for your deployment going?

    Author Comment

    Hi Msquru,
    Sorry have been sooooo busy with various stuff I haven't been servicing my q and a stuff.
    Thanks for your info it was helpfull. I'm going to split the coverage as you suggest (802.11a and 802.11g/b) only problem is that the external antenna (Netgear ANT2409) only appears to support 2.4 Ghz ie 802.11g/b. If the internal coverage for the WAP servicing the external antenna is line of site (IE for the single room in which it is sited) will 802.11a at 5GHz be OK since no walls etc.

    LVL 4

    Expert Comment

    Yes, 802.11a is good for line-of-sight as you suggest.
    Let us know how it went, when you get to try it all out!

    Author Comment

    Hi Guys, Have awarded th epoints to msquru since this chap wants to close the Q.
    I have all the kit now and have checked out off site, all OK.
    I have to deploy around 15 to 20 November, I'm sure all will be well.


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