Controller places ap's on same channel

I am studying for the CCNA Wireless, and just acquired a WLC 2125 and some ap's to lab with for a bit. I have the channel and power settings set to global, and there are 2 1142's attached to the controller in local mode. Both are accept clients and roaming seems to work as it should. However, I also have an autonomous ap thrown in the mix (another 1142) to see how the controller reacts. It appears quite content to place one of the controller-based ap's on the exact same channel as the autonomous ap 3 feet away from it. The controller sees it as a rogue at -27 RSSI on the same channel, so it's by no means a ghost. Any ideas on settings I should check? I figured the controller would try to balance on 1,6,11 based on the environment as well as its members. Here is a screen shot of what I am seeing.

Q. I have set the Radio Resource Management (RRM) to the default settings on my WLC. However, I cannot find my RRM to automatically adjust the channel and power levels. Why?
A. RRM possibly does not work for any of these reasons
The RRM works only if an AP hears RF signals from at least 3 nearby APs, with a third neighbor that transmits a signal strength greater than -65dbm. If any of these condition fails, the RRM does not work.
The auto RRM feature includes channel adjustment, power adjustment, and coverage hole detection. These features do not work if they are either disabled or the method of assignment is chosen as manual.
While a fresh AP boots up, it initially keeps power at the default value of 1 (highest). When it sees 3 or more APs with power levels greater than -65 dBm (in the same RF-Mobility-Domain and same channel), it attempts RRM first (change channels). If not successful because the channels are manually fixed or there are more APs than channels available, the AP drops its power level.
Refer to Radio Resource Management: Concepts for more information on how RRM works
http://www.cisco.com/en/US/products/ps6366/products_qanda_item09186a008064a991.shtml

Similar Messages

How to use the same channel to send a file and messages to the server

I'm trying to develop a simple program that will send and receive files from the server and in the same time I need to communicate with the server through the messages
I'm using TCP Socket
my problem is
I have only one channel
so, I have no option, either I can use it for sending the file itself or sending the message .. but not both !
my question is : How can I use the same channel for sending and receiving (file & message)
I would appreciate for any clue or hint
best

kajbj wrote:
kmarwani wrote:
Thanks for reply
yes, that what I'm thinking to do
but, in case of sending binary file, if I attached a flag on its header, will it corrupt the file ?
bestThe other end would of course need to decode the messages that you get, and only write the "data" part to the file.Thanks
I'm gonna try to hard-code what you suggest and i will post what happen with me here
even though I'm not sure how can I add header to a binary file and remove it from the file at other end. (coz I read it as stream and send as array without touching its contents)
this how I'm sending the file
ConnSocket = CSocket.accept();
ToClient = new DataOutputStream(ConnSocket.getOutputStream());
File myFile = new File("abc.jpg");
FileInputStream myFileInStream = new FileInputStream(myFile);
BufferedInputStream mybuffInStream = new BufferedInputStream(myFileInStream);
myBytArray = new byte[(int) myFile.length()];
mybuffInStream.read(myBytArray, 0, myBytArray.length);
ToClient.write(myBytArray, 0, myBytArray.length);
ToClient.flush();
myFileInStream.close();best

[svn] 4290: Bug: BLZ-288 - Consumer is only receiving first pushed message when Consumer and RemoteObject that is used to push the messages use different channel sets but same channel .

Revision: 4290
Author: [email protected]
Date: 2008-12-11 14:24:37 -0800 (Thu, 11 Dec 2008)
Log Message:
Bug: BLZ-288 - Consumer is only receiving first pushed message when Consumer and RemoteObject that is used to push the messages use different channel sets but same channel.
QA: Yes
Doc: No
Checkintests Pass: Yes
Details:
* The bug app was arguably generating bogus test data (messages with duplicate ids), and 99.9% of applications won't be configured this way (using multiple ChannelSets with overlapping Channels, pointing at the same server) but it's still worth making this work just right anyways.
Ticket Links:
http://bugs.adobe.com/jira/browse/BLZ-288
Modified Paths:
flex/sdk/trunk/frameworks/projects/rpc/src/mx/messaging/ConsumerMessageDispatcher.as

Remember that Arch Arm is a different distribution, but we try to bend the rules and provide limited support for them. This may or may not be unique to Arch Arm, so you might try asking on their forums as well.

Same Channel on Different WLANs and RTS/CTS

Hi
I have 2 questions about physical layer of wireless lan.
1-) Many WLANs(SSID) use same channel for communication, that means they use same frequency, what prevents the collisions between different wlans but same channel?( I am asking about RF signal collision)
2-) Do rts and cts valid for just one wlan that computer which is generated, belongs to or do rts/cts synchronize all different wlans that use same frequency.
Thanks.

1.) Congestion Avoidance. Before the client transmits, it listens to for energy on the frequency it is transmitting on. If it hears energy, it backs off for a time. Then listens again.
http://en.wikipedia.org/wiki/Carrier_sense_multiple_access_with_collision_avoidance take a look at the diagram on the left
2.) RTS/CTS client sends the RTS, then the AP will send the CTS.
http://en.wikipedia.org/wiki/IEEE_802.11_RTS/CTS
HTH,
Steve

When i open an irc link with a channel name that contains "~" at the end, firefox (14.0.1) opens the same channel name but with "%7E" instead of "~" at the end

when i open an irc link with a channel name that contains "~" at the end firefox (14.0.1) opens the same channel name but with "%7E" instead of "~" at the end
http://img835.imageshack.us/img835/2856/clipboard05nq.jpg

I can not open the image, but I can say something in general about the tilde.<br>
The tilde "~" is an unreserved character and therefore it can be replaced by its percent-encoded form "%7E" inside a URI without changing meaning. See<br>
http://en.wikipedia.org/wiki/Percent-encoding<br>
According to section 2.3 of RFC3986 we should prefer the unencoded form so this behavior seems to be a bit out-dated.<br>

[svn] 4258: Bug: LCDS-522 - Add more configurable reconnect handling for connecting up again over the same channel when there is a connection failure /outage.

Revision: 4258
Author: [email protected]
Date: 2008-12-08 16:33:17 -0800 (Mon, 08 Dec 2008)
Log Message:
Bug: LCDS-522 - Add more configurable reconnect handling for connecting up again over the same channel when there is a connection failure/outage.
QA: Yes
Doc: No
Checkintests Passes: Yes
Details:
* Updates to configuration handling code and MXMLC code-gen to support new long-duration reliable reconnect setting.
Ticket Links:
http://bugs.adobe.com/jira/browse/LCDS-522
Modified Paths:
blazeds/trunk/modules/common/src/flex/messaging/config/ClientConfiguration.java
blazeds/trunk/modules/common/src/flex/messaging/config/ClientConfigurationParser.java
blazeds/trunk/modules/common/src/flex/messaging/config/ConfigurationConstants.java
blazeds/trunk/modules/common/src/flex/messaging/config/ServicesDependencies.java
blazeds/trunk/modules/common/src/flex/messaging/errors.properties
Added Paths:
blazeds/trunk/modules/common/src/flex/messaging/config/FlexClientSettings.java
Removed Paths:
blazeds/trunk/modules/core/src/flex/messaging/config/FlexClientSettings.java

Remember that Arch Arm is a different distribution, but we try to bend the rules and provide limited support for them. This may or may not be unique to Arch Arm, so you might try asking on their forums as well.

Comapre 2 same channels from two different dat filea

Hi ,
I want to compare the wave forms of two same channels names (in my sample data which is in attachment, the same channel names are S1KNSLLE00H3DSZP) from different dat file(S2100044 and S2100041) .
Load the 2 dat files from navigator.
Come to report and open two 2d axis systems to see the wave forms of two different channels ( Like in attachment result.jpg)
I need an autosequence to do the same for all the channels for 2 dat files automatically.
Attachments:
cmp.zip ‏1967 KB
result.JPG ‏158 KB

Hi RSH,
I appreciate you posting 2 data files and the jpg, but I'm afraid I still have lots of questions before I can advise you. You sent 2 *.dat files which each had 1 channel in them named "Data", which is different from your email text and the jpg you posted. Will your data sets typically have many channels in them? Your posted *.dat files had no time channel and the "Data" channel was not a waveform channel, yet the 2 different "Data" channels were different lengths. Do you want to plot your channels vs. the array index all the time (as is shown in your jpg)?
Do you want to have N sheets in REPORT, one for each channel? Why don't you want to have both "S1KNSLLE00H3DSZP" channels as curves with different colors on the same graph-- wouldn't that make it easier to compare them?
When you drag over the data channel onto a REPORT graph, you will get a reference like "[1]/Data" or "[2]/Data", which is exactly what you want to compare the "Data" channel from 2 arbitrary data files (note that the file name does not show up in the channel references). So it seems to me that the REPORT layout you sent a jpg of already satisfies what you're asking us to create for you. Why do you need a script at all?
Brad Turpin
DIAdem Product Support Engineer
National Instruments

When extending my wifi network using an Extreme as my main and an Express to extend.. does it help to make sure that both devices are on the same channel or does it even make a difference if they are on different channels?

when extending my wifi network using an Extreme as my main and an Express to extend.. does it help to make sure that both devices are on the same channel or does it even make a difference if they are on different channels?

Have you even tried the process in which i have described in my previous post?
Yes, many times. If you are setup to "extend a wireless network, the screen looks like this:
If you click the Wireless Options button, the screen looks like this:
Where is it on this screen that you see a setting to adjust the channel? It sounds like you are confusing "create a wireless network"....which does allow you to adjust channels.....with "exend a wireless network" which does not.
Normally, when you extend a wireless network, AirPort Utility used to always assign the same channel to the extending device. That is no longer the case. It might be the same, or it might be different. You have no control over this, so you have to accept what AirPort Utility thinks is best.

Live event: same channel same port fail to stream two differ stream type

Hi All,
When I create live event in same channel and same port with differ type streaming (unicast and multicast) I can’t start DME so I cannot start broadcast too and video cannot stream..
I did try and used non-dme live event .. the result still same and video not stream in sns. Im ussualy use this way with last dmm version (5.0.2) and to day I use SnS ver 5.2.1 its not running/ video blank......
anybody know what happening ???
thanks
RD

RD,
Lets step back a little and get some more details:
* What type of DME are you using?
* What is connected to the DME providing the LIVE stream?
* Specifically, how do you have the DME configured for your setup?
* Please provide the SCREEN CAPTUREs of your DME configuration on
the SNS
* Have you configured a "Basic" configuration (single channel\port only) on the DME
and SNS with 5.2.1 and have it working? Have you ever got the DME working with SnS 5.2.1
Thanks!
T.

Roaming Network & Same Channel

I have set up a roaming network with an airport extreme & 2 airport expresses via Ethernet. Setup was a breeze using the utility. I have read that on a roaming each base-station should be 4-5 channels removed from the other stations so as to not cause interference. Every station on the roaming network is set to "automatic" for radio mode and radio channel. Out of pure curiosity, I looked to see which channel the base-stations were tuned to and found that two of the three were set to the same channel in 2.4ghz and on the 5ghz a different pair were set to the same channel. Is this normal? Should I manually change? Everything is working perfect, i just don't know if i am missing out on optimal performance.
Jimmy

Setting the Radio Channel to "automatic" usually provides the best channel selections ... but not always. The key for a roaming network is that only the base station adjacent to each other should have their channels set to 4-5 channels apart to prevent interference. Automatic tends to do the trick nicely.
If you can imagine a roaming network that spans over 4 base stations or more, you start running out of channels to choose from if you configure each to have a 4-5 channel separation from each other. Since the 2.4 GHz band only has three really non-overlapping channels, this would get harder as you add more base stations. So, either setting them all to automatic or carefully setting them manually you will still find some operating on the same channels. Again, this is ok as long as they are not near each other.

DVD ROM/CDRW on same channel, no worky

I have a CD-RW (set as SLAVE) and a DVD Rom (set as MASTER) connected to IDE2. Only the DVD is reading media. If I remove the DVD and make the CDRW master, it will then read media. The device manager shows no problems with either device. They work fine independently, just not on the same IDE channel.
Any ideas?

Thanks for the tip.
Both devices work fine on seperate channels.
I've switched my drives' master/slave jumpers back and forth. I've replaced the IDE cable. Checked the BIOS and the Device Manager and there were no conflicts or problems in general. Windows does see both drives (as location 1 and 0). However the CDRW will not read media as either a slave or a master on the same channel as the DVD Rom. The DVD on the other hand can read in either state. Would there be any reason my CDRW wants full priority perhaps? I'm drawing a blank. Oh and the CDRW is a Lite On 40125s

TV's on Same Channel - why a delay?

When I have the same channel on 3 TV's, why are they delayed and not the same? I have them all on HD channels, so, it can't be because it's HD vs SD.
Thanks.

If one of the boxes is a DVR. The reason for the delay is the buffer. On the regular box, live programing comes in and is displayed. On a DVR the live programing comes in, is buffered (so you can pause and rewind the live tv) which takes a second or so. So the programing will display about about a second behind the live programing.
====================================================================================
Error exists between keyboard and chair.

Dual APs on same channel?

Hi-
I'd like to boost power in one of our classrooms to accomodate increased simultaneous use of both Chromebooks and iPads. The APs in the classrooms are A1408 AEs. Would adding an additional A1408 in the classroom on the same channel double the power?
Thanks!
Mark

No, that is wrong. You should not need to boost power inside a classroom. What you need to do is split the load between two AP's so the kids all get decent connection.
You can use a second Airport Extreme as long as it is wired back to the main AP, not in extend wireless because that just causes more issues.
You need to use roaming network.
See http://support.apple.com/kb/ht4260
In a roaming network you want each device on a different channel that is not overlapping.

How do I assign midi controls to 2 separate plug ins in the same channel strip?

Hi
I want to set up my Oxygen 2 to control my eq and compressor in the same channel but when I set the 8 knobs to the EQ parameters and then try to do the same to the compressor, I either have to delete the eq controls or have them both assigned to the same knob, which is obviously not what I want to do as changing one knob effects the other plugin. I thought whatever plugin I click would be the one that gets the midi focus, but clearly not, any ideas?
Thanks
Christian.
PS Logic 9 by the way.

Put the effects on two separate auxes and send the sound to both. Install both auxes in the arrangement and assign your knobs for each one. Then you can select each aux track when you want to control its effect. Or use 4 knobs for each.

Automation: Howto move the selected area to another place in the same channel

Dear Forum members,
in my automation plugin i want to move some area from an alpha channel to somewhere else in the same alpha channel. As a user i select an area, call the move tool (the v key) and move it to the destination. Listener.log tells me that this is an ' eventCut' with some parameters. I clean-up the code a little bit and get this:
>
SPErr MoveSelection (double DistanceX, double DistanceY)
PIActionDescriptor descriptor = NULL;
PIActionReference reference = NULL;
PIActionDescriptor descriptor2 = NULL;
PIActionDescriptor result = NULL;
SPErr error = kSPNoError;
error = sPSActionDescriptor->Make (&descriptor);
if (error) goto returnError;
error = sPSActionReference->Make (&reference);
if (error) goto returnError;
error = sPSActionReference->PutProperty (reference, classChannel, keySelection);
if (error) goto returnError;
error = sPSActionDescriptor->PutReference (descriptor, keyNull, reference);
if (error) goto returnError;
error = sPSActionDescriptor->Make (&descriptor2);
if (error) goto returnError;
error = sPSActionDescriptor->PutUnitFloat (descriptor2, keyHorizontal, unitPixels, DistanceX);
if (error) goto returnError;
error = sPSActionDescriptor->PutUnitFloat (descriptor2, keyVertical, unitPixels, DistanceY);
if (error) goto returnError;
error = sPSActionDescriptor->PutObject (descriptor, keyTo, classOffset, descriptor2);
if (error) goto returnError;
error = sPSActionControl->Play (&result, eventCut, descriptor, plugInDialogSilent);
if (error) goto returnError;
returnError:
if (result) sPSActionDescriptor->Free (result);
if (descriptor) sPSActionDescriptor->Free (descriptor);
if (descriptor2) sPSActionDescriptor->Free (descriptor2);
if (reference) sPSActionReference->Free (reference);
return error;
This gives no error, it even removes the selected area from the document, but puts it in neverneverland, instead of moving it e.g. 100 pixels to the right (DistanceX == 100.0).
What am i doing wrong ?
Regards, Christof

Dear Forum members,
I had forgotten to select the correct channel, so please ignore my previous posting. The posted code is working as it should.
Regards, Christof

Controller places ap's on same channel

Similar Messages

Maybe you are looking for