Re: OT: Wireless Signal Strength

I may be totally wrong, but this sounds like RRM is screwing things ?
Have you opened a TAC case ? RRM might have debugs that should help
pinpointing why it is considering getting the signal low.

It might be inferring that somehow noise you are getting is being self
inflicted by the others APs and trying to minimize it by reducing power.
The algorithm is for sure quite complicated. I would double check
that all your APs are configured with the same RF Group Name.

-Carlos

Khurram Noor wrote:
> Yes, this is an important point. As i calculated, 18 out of 24 Aps are using
> channel 1 and the rest of 6 are using channel 6. The first floor and eight
> floor are the one which has most problems, both have only 2 APs convering
> the whole floors and both APs are in different channels, i.e. 1 and 6
> respectively. Again this is dynamic assignment by RRM.
>
> Regards,
> Khurram
>
> On Sun, Dec 26, 2010 at 8:46 PM, Mohammad Saeed <mzsaeed_at_gmail.com> wrote:
>
>> Also try resetting the AP's one by one, what it will possibally do
>> that once w=one AP is UP and its using channel 1, the 2nd AP will
>> startup, detetct that other AP is using channel 1 and will start using
>> channel 6 or other non-overlapping channel.
>>
>> Wassalam,
>>
>> Mohammad Zahid Saeed
>>
>> On Sun, Dec 26, 2010 at 10:17 AM, Khurram Noor
>> <engr.khurramnoor_at_googlemail.com> wrote:
>>> Salam Saeed,
>>>
>>> I checked your idea. I used one D-link wireless router for Wi-Fi
>>> connectivity on the same machine where signal strength problem was
>>> encountered, but it is working fine. even on greater distance.
>>>
>>> The thing with WLC managed AP which is very surprising is that the users
>>> even sitting very close to the APs are encountring this problem. There
>> are
>>> two WLCs, each has 12 APs connected. This problem is particular in areas
>> of
>>> floor were are only two APs on the whole floor. By the way those APs are
>> not
>>> properly placed so i will try changing the position to see if convergance
>>> for wireless network improves.
>>>
>>> Regards,
>>> Khurram
>>> On Sun, Dec 26, 2010 at 4:48 PM, Mohammad Saeed <mzsaeed_at_gmail.com>
>> wrote:
>>>> Assalamualaikum,
>>>>
>>>> If this is problem with all AP's, then its highly unlikely that all
>>>> AP's have started having HW problem at once. I would suspect most
>>>> likely there is some interference problem, check if something has been
>>>> changed/added in the building?
>>>> I would recommend installing a standalone AP (not registering with
>>>> WLC) and connect to that AP to eliminate WLC's are not causing the
>>>> issue. If cleint clnnecting to that AP does not suffer similar signal
>>>> strength issue, then check whats been changed in WLC?
>>>>
>>>> Wassalam,
>>>>
>>>> Mohammad Zahid Saeed
>>>>
>>>> On Sun, Dec 26, 2010 at 1:18 AM, Khurram Noor
>>>> <engr.khurramnoor_at_googlemail.com> wrote:
>>>>> Dear all,
>>>>>
>>>>>
>>>>>
>>>>> I am having a strange problem with a client. He has around 25 access
>>>>> points
>>>>> installed in a 8 floor building. They are using cisco AP 1140 with 2
>>>>> WLCs
>>>>> 5508 for management. Things were fine in the beginning but now the
>>>>> problem
>>>>> is with the signal strength. The signal bars on any system before
>>>>> connection
>>>>> shows excellent strength, but as soon as the system gets connected,
>> the
>>>>> signal strength starts to decrease and becomes poor. this causes
>> latency
>>>>> and
>>>>> timeout. Browsing becomes really slow and wireless users are
>> suffering.
>>>>>
>>>>>
>>>>> Wireless Lan controller runs an algorithm called RRM, which
>>>>> automatically
>>>>> adjust Tx power, channel assignment and many other parameter. If there
>>>>> is
>>>>> someone in this group who know can tell what settings on WLC need to
>>>>> change.
>>>>> Could this be a result of some power issue on the catalyst 4500 switch
>>>>> which
>>>>> is a POE supported? Or is this some malware kind of thing?
>>>>>
>>>>>
>>>>> By the way wired users have no such problem (latency, delay etc)
>>>>>
>>>>> --
>>>>> Khurram Noor
>>>>>
>>>>>
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>>
>>>>>
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>
>
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net