Minimum distance between access points

Is it possible to locate 2 ap's (1200s) so close that they desense each other? I'm having some performance issues in an area where the 1200s are pretty close to each other.
Thanks for any help on this.
Mark

Hi Mark,
It is possible to locate AP's so close that they cause each other problems. Here is a link to a good document for the 1200 AP.
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_tech_note09186a00805190f1.shtml#topic4
Here is an excerpt from the actual doc:
Position the APs Optimally
"The placement of the APs at the correct places is an important factor that accounts in the extension of the coverage area of the AP. Too many APs in the same vicinity can create radio congestion and interference, and reduce the throughput.
A careful site survey can determine the best placement of APs for maximum radio coverage and throughput."
Hope this helps!
Rob
Please remember to rate helpful posts...........

Similar Messages

IPad's Roaming Between Access Points

A company with 460 Cisco Access Points is using iPad Mini's to control lighting and other things, the iPad Mini's are roaming between access points VERY SLOW, they are dropping 45-50 packets between roams. iPad 2's and iPhone's are roaming just fine, if they drop any packets it's a max of 5.
Is there any differance in the NIC's that are in iPad 2's and iPad Mini's? Or is there a setting for fast roaming?

Hi,
It seems that these APs are not aware of each other, I would suggest you look into a controller based solution, that means you need some sort of controller base AP system to get this seamless roaming feature, I also suggest you check whether there's compatibility
issue for the device with product vender.
Yolanda Zhu
TechNet Community Support

Customizing distance between data Points on x-Axis

Hi,
I want to draw a LineChart.
I have these Timestamps [84, 1000, 34000, 34699, 439999] who
are represanting the x-Value of DataPoints along the X-Axis.
Unfortunately the distance between 2 datapoints along the
x-Axis is always the same, that means that between the points with
x-values 84 and 1000 is the same distance along the axis as between
the points with x-values 34699 and 439999.
But the distance between points with x-values of 34699 and
439999 should be much greater than between 84 and 1000.
How can I customize the distance between data Points on a
LineChart to solve my Problem?
I really dont know right now!
Greeting,
Z.

"zidaninho" <[email protected]> wrote in
message
news:gls479$nkt$[email protected]..
> Hi,
>
> I want to draw a LineChart.
> I have these Timestamps [84, 1000, 34000, 34699, 439999]
who are
> represanting
> the x-Value of DataPoints along the X-Axis.
>
> Unfortunately the distance between 2 datapoints along
the x-Axis is always
> the
> same, that means that between the points with x-values
84 and 1000 is the
> same
> distance along the axis as between the points with
x-values 34699 and
> 439999.
> But the distance between points with x-values of 34699
and 439999 should
> be
> much greater than between 84 and 1000.
>
> How can I customize the distance between data Points on
a LineChart to
> solve
> my Problem?
>
> I really dont know right now!
What happens if you convert the time stamps to Dates and use
a DateAxis?

How do I set the transition between access points would be fine?

Hello everyone,
We have an organization Wirless controller 2504 with 20 aironet access-point (700 series)
Once I defined all the access points I noticed that the transition between them is not working fine...
I mean that clients can not walk around in our organization without having to connect to any access point separately.
How do I set the transition between access points would be fine?
Thanks a lot (:

HI Omri,
which software version you have on WLC ?
Is the site survey done propely ?
Remember: It is the client that decides when to roam and which AP to connect to based on what it perceives the signal to be.
If your site survey design is perfect and still have problems while roaming then:
Disable your lower data rates on the 2.4ghz and or 5ghz radio and your clients will roam better. Try to disable everything below 11mbps. and give that a try.May be old device will work in this case.
Regards
Dont forget to rate helpful posts

Distance between all points

Hi all, I am trying to find the distance between all points in an array. I was able to get the all possible combinations but i am not getting the expected ouput.
For eg, if i have four points, total number combinations are going to be 6 and i want to find distance in all six combinations.
Please help me where i did mistake. Please find the attached vi.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13
Solved!
Go to Solution.
Attachments:
Find distance between all points.vi ‏17 KB

Try something like this.
Since I don't have the IMAQ function, I am using complex data for each point, but it would be trivial to adapt it to your data structures instead.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Find distance between all points.png ‏33 KB
Find distance between all pointsMODCA.vi ‏10 KB
Find distance between all pointsFP.png ‏21 KB

How to measure distance between two points uisng uiaccelerometer

Hello all,
I am trying to measure distance between two points.So for that i am used uiaccelerometer but its give only rotation changes. I am moving my whole device from one point to another point so for that all x,y & z changes remain same. So how can get the device movement for that?
Thank you..

UIAccelerometer does not give rotation changes, it senses acceleration in each of the 3 axis in g-force units. Moving in a plane from one point to another and stopping will result in a net g-force in that axis of zero. To get distance one has to measure the initial acceleration and then the time before a deceleration is detected. It gets really complicated in real life since the start and stop are not instantaneous.

Find driving distance between two points without using API by use of Lat & Long?

Using Google geocode API : http://maps.googleapis.com/maps/api/geocode/xml?address=thane&sensor=true
We performed get distance between search criteria entered by user and all related clubs by lat & long stored at db.
2. Two different points such as
(origin: Lat1 & Long1) and (destination: Lat2 & Long2)
We tried for to get distance between these two points,
(Lat2 & Long2) to (Lat1 & Long1)
But distance which we get by calculation is simple straight line distance
Origin Destination
(Lat1 & Long1) (Lat2 & Long2)
3. This is not driving distance as google shows in exact Km
4. For that Google provide another API (distancematrix API)
http://maps.googleapis.com/maps/api/distancematrix/xml?origins=Thane&sensor=true&destinations=khopat&mode=driving&language=en%20-%20EN
5. But there is limit for DistanceMatrix-Service without ClientID and client key
100 elements per query.
100 elements per 10 seconds.
2 500 elements per 24 hour period.
But as element request exceeds it shows : OVER_QUERY_LIMIT error
6. In case of Client ID and Client key
In Distance Matrix 100 000 elements per 24 hour period,a maximum of 625 elements per query and a maximum of 1 000 elements per 10 seconds.
As per this one there is option to get purchase these API but basic question is remain same for us if we are requesting single origin and multiple destination then how element calculation done by google?
But in document google says :
Elements
The information about each origin-destination pairing is returned in an element entry. An element contains the following fields:
Status: See Status Codes for a list of possible status codes.
Duration: The duration of this route, expressed in seconds (the value field) and as text. The textual representation is localized according to
the query's language parameter.
Distance: The total distance of this route, expressed in meters (value) and as text. The textual value uses the unit system specified with the
unit parameter of the original request, or the origin's region.

Any information that you see in a google map webpage can be retrieved using the API. The best way of finding the tags on the webpage is to manually perform the query using an IE webpage. Then capture the source and save to a file so you
can use a text editor to look at results. I often on a webpage use the menu : View - Source and then copy the source to a text file.
jdweng

Trying to figure out difference between Access Point & Gateway

Hello All,
I am trying to figure out how to expand my home network and getting confused by the terms. The following is what I have for equipment"
WRT 130N
WRT 54GS
4 hard wired assorted items hard wired to the 130N
Here is what I want to do and not sure if I can do it:
I would like to use the wireless side of the 54GS to connect to the wireless side of the 130N. By [lacing the 54GS on a different floor of our home we will have four more hard wire ports to utilize for addition hardware we want to network.
My questions are as follows:
Is there a way that using the firmware in the 130N & 54GS to do this> The 54GS is V.7 and the 130N is only about six months old so it's the most current firmware. I am completely confused as to what the difference is between a gateway and an access point.
Today was spent reading everything on the net about after market upgrades and in the end I am only more confused.
Can anyone offer me some advise or guidance?
Thanks,
Ted

access point:
A device that allows wireless-equipped computers and other devices to communicate with a wired network. Also used to expand the range of a wireless network.
gateway:
A device that interconnects networks with different, incompatible communications protocols
Analyzing the network environment that you want to create, is it?
1. wrt130N )))))                                    ((((( wrt54gs ))))                              ((((( 4 devices
2. wrt130N )))))                                    ((((( wrt54gs ----------------------------------------- 4 devices
If it is figure 1. it is not possible, neither figure 2. to get it working that way, because wireless routers can only function as a wireless router, wired router and an access point.
What you can do though is :
wrt54gs- at least fw: 7.50.5   ))))))             ((((( wap54g - in repeater mode - ))))))            (((((( pc
wrt54gs- at least fw: 7.50.5   ))))))             ((((( wap54g - access point client mode- wrt130n - dhcp disabled --------------------- 4 devices
Take note though that wrt54gs has not been know to work with wpa54g access access point client mode
Your best bet is to just wire wrt130n to wrt54gs and change the ip address of the latter to i.e. 192.168.5.1.
" I can do all things through Christ which strengthens me. "

Difference between "access point solution" and "hot spot solution"

Hi to all, i'm Fabio.
My customer has a bookshop and wants to allow to his customers access to the internet using wifi connection.
Here in Italy there are a lot of laws and is very hard to create this type of solution without legal permission, authorization and so on.
However, i'm reading some technical website, and lot of them propose solution based on hot spot and not access point.
Now my question my doubts:
-Is there some difference (technical and "conceptual") between hot spot and access point?
-How are the law outside Italy, in order to satisfy this type of request?
You have to think that here, based on the Italy rules, my customer should become a telecommunication operator to allow him to install ten access point for public use!!!!!!!!
Thanks, Fabio Marino.

Ok Surendrea, in this case i post here what you have to translate from my link
(source: http://www.cdaweb.it/Articoli_Vista/tabid/94/articleid/305/Default.aspx?dnnprintmode=true&mid=421&SkinSrc=[G]Skins%2F_default%2FNo+Skin&ContainerSrc=[G]Containers%2F_default%2FNo+Container):
"Quali soluzioni tecnologiche possono essere adottate per tutelarsi in questo senso? Una esaustiva risposta a tale domanda viene data in questo articolo di 01Net.it. Possiamo sintetizzarne i concetti. I gestori dovrebbero preferire soluzioni di tipo hotspot, invece che access point. Questi ultimi infatti hanno la funzionalità basilare di diffusione del segnale, senza però poter tracciare l'autore di eventuali attività illecite, in quanto non esiste distinzione tra gli utenti collegati e non rimane traccia del traffico prodotto. Gli hotspot, invece, permettono di far autenticare con username e password univoci ciascun utente, e quindi rintracciarlo in caso di necessità, gestire ticket di navigazione, gestire la banda in modo che un singolo utente non la monopolizzi rallentando o intasando la navigazione altrui, separare la rete personale/aziendale da quella del Wi-Fi pubblico, e mantenere traccia di tutto il traffico attraverso i file di log (i registri degli accessi). Ecco la soluzione ideale che consente all'esercente di dimostrare di non essere l'autore di attività illecite."
English version:
"What technological solutions can be adopted to protect themselves in this way? An exhaustive answer to this question is given in this article 01Net.it. We can summarize the concepts. managers should prefer solutions like hotspots, rather than access point. These in fact have the basic functionality of spreading the signal, without being able to trace the perpetrators of any illegal activities, as there is no distinction between connected users, and no trace of the traffic generated. hotspots, however, allow to authenticate with username and passwords each user, and then track it down if needed, manage navigation tickets, manage bandwidth so that a single user does not monopolize the slowing or clogging the navigation of another, separate network and personal business than that of Wi-Fi public, and keep track of all traffic through the log files (access logs). This is the perfect solution that allows operator to demonstrate that it is not the author of any illegal activity."
May be based on this information you can learn something new

Excel formula to calculate the distance between multiple points using lat/lon coordinates

I'm currently drawing up a mock database schema with two tables: Booking and Waypoint.
Booking stores the taxi booking information.
Waypoint stores the pickup and drop off points during the journey, along with the lat lon position. Each sequence is a stop in the journey.
How would I calculate the distance between the different stops in each journey (using the lat/lon data) in Excel?
Is there a way to programmatically define this in Excel, i.e. so that a formula can be placed into the mileagecolumn
(Booking table),
lookup the matching sequence (via bookingId)
for that journey in the Waypointtable
and return a result?
Example 1:
A journey with 2 stops:
1 1 1 MK4 4FL, 2, Levens Hall Drive, Westcroft, Milton Keynes 52.002529 -0.797623
2 1 2 MK2 2RD, 55, Westfield Road, Bletchley, Milton Keynes 51.992571 -0.72753
4.1 miles according to Google, entry made in mileage column
in Booking table
where id
= 1
Example 2:
A journey with 3 stops:
6 3 1 MK7 7DT, 2, Spearmint Close, Walnut Tree, Milton Keynes 52.017486 -0.690113
7 3 2 MK18 1JL, H S B C, Market Hill, Buckingham 52.000674 -0.987062
8 3 1 MK17 0FE, 1, Maids Close, Mursley, Milton Keynes 52.040622 -0.759417
27.7 miles according to Google, entry made in mileage column
in Booking table
where id
= 3
I understand that 100% accuracy is not possible, so it will not be an issue.

http://www.cpearson.com/excel/LatLong.aspx
and
http://www.contextures.com/excellatitudelongitude.html

Distance between two points with degrees and minutes

I would like to store several points in the database given degrees and minutes as position. In this example I have point 1 that is E 150, 0/S 30, 0 and points 2 that is E 150, 0/S 30.1. For example if I enter 2 km as distance from position of point 1 I would like the search to return all points witin 2 km.(should return points 2 that is very near)
If I run the query
SELECT c.name
FROM cola_markets_cs c
WHERE
SDO_WITHIN_DISTANCE(c.shape,
SDO_GEOMETRY(2001, 8307, SDO_POINT_TYPE(150.0, 30.1, NULL), NULL, NULL),
'distance=10000 unit=KM')
= 'TRUE';
I get result both position 1 and 2, but if I decrease to distance=1000 no rows is returned.
Can you see what I am doing wrong here?
Can I also combine SDO_WITHIN_DISTANCE with SDO_NN_DISTANCE so I can ask for all points 10 km in distance from the reference point and I can also see the actual distance for each point?
Thank you
I have tested with the following code. Do I save the position wrong..?
CREATE TABLE cola_markets_cs (
mkt_id NUMBER PRIMARY KEY,
name VARCHAR2(32),
shape MDSYS.SDO_GEOMETRY);
INSERT INTO cola_markets_cs VALUES (
1,
'Point 1',
MDSYS.SDO_GEOMETRY(
2001,
8307,
MDSYS.SDO_POINT_TYPE(150.0, 30.0, NULL),
NULL,
NULL
INSERT INTO cola_markets_cs VALUES (
2,
'Point 2',
MDSYS.SDO_GEOMETRY(
2001,
8307,
MDSYS.SDO_POINT_TYPE(150.0, 30.1, NULL),
NULL,
NULL
-- UPDATE METADATA VIEW --
-- Update the USER_SDO_GEOM_METADATA view. This is required
-- before the Spatial index can be created. Do this only once for each
-- layer (i.e., table-column combination; here: cola_markets_cs and shape).
INSERT INTO USER_SDO_GEOM_METADATA
VALUES (
'cola_markets_cs',
'shape',
MDSYS.SDO_DIM_ARRAY(
MDSYS.SDO_DIM_ELEMENT('Longitude', -180, 180, 10), -- 10 meters tolerance
MDSYS.SDO_DIM_ELEMENT('Latitude', -90, 90, 10) -- 10 meters tolerance
8307 -- SRID for 'Longitude / Latitude (WGS 84)' coordinate system
-- CREATE THE SPATIAL INDEX --
-- Must be R-tree; quadtree not supported for geodetic data.
CREATE INDEX cola_spatial_idx_cs
ON cola_markets_cs(shape)
INDEXTYPE IS MDSYS.SPATIAL_INDEX;
--This search only return if distance is 10 000 km...
SELECT c.name
FROM cola_markets_cs c
WHERE
SDO_WITHIN_DISTANCE(c.shape,
SDO_GEOMETRY(2001, 8307, SDO_POINT_TYPE(150.0, 30.1, NULL), NULL, NULL),
'distance=10000 unit=KM')
= 'TRUE';
--According to this search the distance to point 1 is 3331198,72256398,
--this should be zero..
SELECT
c.mkt_id, c.name, SDO_NN_DISTANCE(1) dist
FROM cola_markets_cs c
WHERE SDO_NN(c.shape,
sdo_geometry(2001, 8307,sdo_point_type(150.0, 30.1, NULL), NULL, NULL),
'sdo_num_res=2', 1) = 'TRUE' ORDER BY dist

Hi,
What version of Oracle are you using? I got this using your example:
SELECT
c.mkt_id, c.name, SDO_NN_DISTANCE(1) dist
FROM cola_markets_cs c
WHERE SDO_NN(c.shape,
sdo_geometry(2001, 8307,sdo_point_type(150.0, 30.1, NULL), NULL, NULL), 'sdo_num_res=2', 1) = 'TRUE'
ORDER BY dist ;
MKT_ID NAME DIST
2 Point 2 0
1 Point 1 11085.3285
This is 10.1.0.4
Also:
Can I also combine SDO_WITHIN_DISTANCE with SDO_NN_DISTANCE so I can ask for all points 10 km in distance from the reference point and I can also see the actual distance for each point?
No, but you can add a distance calculation:
SELECT
c.mkt_id, c.name, SDO_GEOM.SDO_DISTANCE(c.shape,sdo_geometry(2001, 8307,sdo_point_type(150.0, 30.1, NULL), NULL, NULL),1) dist
FROM cola_markets_cs c
WHERE SDO_WITHIN_DISTANCE(c.shape,
sdo_geometry(2001, 8307,sdo_point_type(150.0, 30.1, NULL), NULL, NULL), 'distance=10 unit=km') = 'TRUE'
ORDER BY dist ;

L3 connections between Access points and WLC

hi,
we have a customer asking us to configure wireless system as per attached drawing.
WLC is in Data Center which is connected to Data Center Switch ( Cisco 3850), then this DC-Switch is connected to DC-Core ( Cisco Nexus-7K).
this Nexus-7K is connected to many campus Networks. in all campuses there is Cisco 4507 Campus Core which is connected to Nexus-7K.
then from Campus core many distribution switches are connected.
all Vlans for data and wifi is created in Distribution Switches. Distribution Switches are VTP Servers and many access switches with connected APs are connected back to this Distribution Switch.
All Access Points are registered at WLC in Data Center, but wifi clients are not getting ip address from DHCP Server, as well as even if we configured static ip address at wifi clients they are not able to communicate correctly.
please correct me if there is a mistake in this design , or we have a solution to solve this problem please let me know.
attached topology diagram
thanks,
anvar

Hey Anvar,
Too much details about network, to make it simple:
1- APs and WLC can be in separate VLANs (Not a problem)
2- As APs have joined, these two VLANs look fine for me
If your clients can't communicate probably with static IP address
1- From the WLC, ping default gateway for that VLAN
2- If the WLC can reach the gateway, its wired VLAN issue that you need to investigate in the path (maybe using wired device in the same VLAN as the clients in the switch where the APs are connected)
Now, about why the clients are not taking IP:
1- What is your DHCP, where its located? Is it the same one for all clients?
2- Do you have local APs or FlexConnect ?
3- When you run the debugs for DHCP where the process breaks?
Cheers,
Nour

Calculating a distance between random points.

Hi everyone,
so my situation is like this :
1) I have created a graph containing random points (3 different series). And the graph have three buttons .The first button will plot 30 random points on the chart. the second and third button will plot random point with different colour.
What I am trying to do now is I need to choose one random point from the 30 points, and calculate the distance from the chosen point to the qrand or qinit..
How can I do that? I really have no idea. Help!
public void ForBtn1()
Random qrand = new Random();
int[,] points = new int[100, 2];
int qinitx, qinity;
for (int i = 0; i < 30; i++)
int pointx = qrand.Next(0, 100);
int pointy = qrand.Next(0, 100);
points[i, 0] = pointx;
points[i, 1] = pointy;
qinitx = points[0,0];
qinity = points[0, 1];
chart1.Series["Initial Point"].Points.AddXY(pointx, pointy);
chart1.Series["Initial Location"].Points.AddXY(qinitx,qinity);
//To initialize random points and initial point
private void button1_Click(object sender, EventArgs e)
ForBtn1();
private void chart1_Click(object sender, EventArgs e)
//To initialize rand_config
private void button2_Click(object sender, EventArgs e)
Random qrand = new Random();
int[,] points = new int[100, 2];
int qrandx, qrandy;
qrandx = qrand.Next(0,100);
qrandy = qrand.Next(0,100);
chart1.Series["Random Configuration"].Points.AddXY(qrandx, qrandy);
private void button3_Click(object sender, EventArgs e)

i cannot attach the photo here .. i dont know why. but here's the photo . check this link.. i uploaded it to fb..
https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-xpa1/v/t1.0-9/11054299_811876005567689_3794441462666954824_n.jpg?oh=7c9576e4f1f9b2a7e2ac9cf744383051&oe=55AC5BD5&__gda__=1438193773_becbb041c6c51cfc4db4b38c2d18e7a2

Distance between GPS points

I have an application where I am collecting GPS data and all is well, had no problem writing the drivers for gps communication but now I need to calculate displacement between my long and lat readings. Is there a labview function developed to do this or do I need to figure out the calculations and code it myself. I am trying to not reinvent the wheel.
Paul
Paul Falkenstein
Coleman Technologies Inc.
CLA, CPI, AIA-Vision
Labview 4.0- 2013, RT, Vision, FPGA

There is a vi for the Garmin GPS, here.
Here is an application in the Developper's Zone
You may want to check out this thread
Message Edited by JoeLabView on 06-13-2007 08:48 AM

Certificate between Access point and Wireless client

Hi;
is there anyway to configure a certificate between the wireless AP and clients to secure my username and the password.
my setup is WLC5508/AP1142/ACS5.4
I need the client to trust the certifcate before entering the UN/PW

Hello,
As per your query i can suggest you the following solution-
LAP authorization can be performed in two ways:
Using the Internal Authorization list on the WLC
Using the MAC address database on an AAA server
The behaviors of the LAPs differ based on the certificate used:
LAPs with SSCs—The WLC will only use the Internal Authorization list and will not forward a request to a RADIUS server for these LAPs.
LAPs with MICs—WLC can use either the Internal Authorization list configured on the WLC or use a RADIUS server to authorize the LAPs
This document discusses LAP authorization using both the Internal Authorization list and the AAA server.
For more information refer to the link-
http://www.cisco.com/en/US/products/ps6366/products_configuration_example09186a00808c7234.shtml
http://technet.microsoft.com/en-us/library/cc759077(v=ws.10).aspx
Hope this will help you.

Minimum distance between access points

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