Rssi strength

My Magic Mouse clicking became very stiff, so I recently purchased a new one, which is continually dropping/disconnecting. Also there is a horrible lag between click and effect which in photoshop makes it unworkable.
In Mountain Lion, holding down the option key while checking the bluetooth menulet would show the (weak) strength of the Blootooth connection with graphic bars. When it is very near the computer which is to my left benath the desk (about 1 foot away) it shows nearly full strength, but when I have it in a workable position (3 feet from MacPro) the signal drops to 'very poor'. I no longer see this graphic result in Mavericks. Is there another way to check the strength of signal?
I brought the Mouse back to the Mac Store where I bought it and of course it worked perfectly, so they could see no issue. I've also tried it at home on an iMac where it works but does disconnect occassionally.
Any suggestions?

Snap ! wrote:
My Magic Mouse clicking became very stiff, so I recently purchased a new one, which is continually dropping/disconnecting. Also there is a horrible lag between click and effect which in photoshop makes it unworkable.
In Mountain Lion, holding down the option key while checking the bluetooth menulet would show the (weak) strength of the Blootooth connection with graphic bars. When it is very near the computer which is to my left benath the desk (about 1 foot away) it shows nearly full strength, but when I have it in a workable position (3 feet from MacPro) the signal drops to 'very poor'. I no longer see this graphic result in Mavericks. Is there another way to check the strength of signal?
I brought the Mouse back to the Mac Store where I bought it and of course it worked perfectly, so they could see no issue. I've also tried it at home on an iMac where it works but does disconnect occassionally.
Any suggestions?
I'm getting -68dbm about three feet from MacPro located on the right of and behind my corner workspace desk (it's wood). Since in my last house the machine was positioned on the opposite side (left) and the signal was much stronger, I figure that I will need some kind of booster (D Link was mentioned elsewhere), externalof an antenna to fix it. That worst case level causes jumping of the Magic Trackpad (MT) that's driving me nuts. It's also affecting any wireless BT device (dongle) that happens to be plugged in.
Maybe some combo of USB wireless devices is the issue, too, I never had this many woreless issues and used the wireless keyboard/trackpad for awhile in various locations typically on the left of the machine. I put the MT on the other side of the room (4' away, but in front of the machine) is -61dbm and it works smoothly.
The closest "working level" that doesn't give a problem is when the trackpad is almost directly on top of the machine @-52dbm. As this is a newer machine, I guess I cannot discount the fact that there is an actual defect in the machine. Is there any other way to test it? I do not have a USB 3 card installed as that is a know BT killer.
further research...

Similar Messages

Why was RSSI removed from iOS4?

It appears that the Field Test Mode has been removed from iOS4 which also prevents owners from accessing their RSSI levels. The RSSI level provides a much better indication of the cellular wireless service signal strength than the signal strength bars. Why has this feature been removed from my 3G phone with iOS4, and is there a better way to monitor signal strength that will not use bars that work on a faulty algorithm?

If you developed a phone that had "signal strength issues" that you were blaming on a mis-calibrated "bars" display, would you want to have a direct signal strength display as well, letting users verify that claim for themselves?

RSSI... can i get better than -80 dBm ???

i would like to know if i should be able to get better than RSSI = -80 dBm (signal strength)... i have four bars (usb ec168 modem) whenever verizon is running at it's best here in northeast oklahoma... a former alltel region... my understanding is that RSSI = -80 dBm is the level that is described as "good enough for Rev A / evdo"...
in my research of this subject googling all over... i find that some people will get RSSI in the 70s and 60s... lower being better / stronger signal... can someone tell me why i cannot get these kinds of levels since i often have four bars showing 90-100% ???
when my RSSI drops to less than -80 dBm... higher values such as -85, etc... this is when my evdo drops to 1xrtt and even DO...
appreciate any enlightenment on this subject... thx!
*obviously, verizon (if you are listening...), since i am paying for 3g broadband... i would like to have 3g broadband, rather than the 1xrtt and DO that happens so very often, evenings, during the week!

Understood. Actually, if you mean the towers are neither VZ or Alltel because the carrier name is not listed, it won't be. Your service may not be from a tower per se either. If there are antennas in the area, that may be where your signal is from.
The towers are listed by the owner and the carriers lease space on them along with the antennas. The sure way to tell is to use your cell phone if you have a VZ phone and do a field test with it since you have a desktop and cannot move it about. The closer you get to the "site" of your signal source, the stronger your signal. evdoforums.com can assist with a list of codes for each brand of cell or smartphone to help you determine this. I also have this if you may need.
Actually, -80dbm is not a bad signal and from my experience, a small percentage get better than that. The best possible is -50.
I wonder why this is even an issue since you have not reported any problem with speeds, connection or any problems that may be associated with the signal strength. If there truly are only 3 towers and no antennas in your area then the reason is more than likely due to congestion.
I have also discovered that the signals, connections, etc. are all improving and doing an update for your PRL if that is possible through your software may just be the fix.
However, if you are insistant on spending money on antennas and/or amps, etc. when the signa isn't anywhere near abnormal, that is your choice. Keep this in mind if you do, you may not have a gain in more than 10 dbm if you have any at all.
So have a great day and good luck.

Weak Airport signal strength after MacBook upgrade to OS 10.5

Today, I finally upgraded my 13-inch 2.16 GHz Core 2 Duo MacBook (2 gig RAM, 160 gig HD) to OS 10.5 from OS 10.4.11. After using install and archive to install the new system, I noticed the Airport signal was down to three bars from the usual four. After completing all the system updates to bring it up to 10.5.8, its still receiving only three bars. We're using a 2Wire wireless DSL modem for Internet service. I was getting the full four bars before the system upgrade, and my wife's 14" G4 iBook is still getting four bars.
What's going on here? Is there an available fix for this? Or am I doomed to going back to OS 10.4.11?
Roger

rmatile wrote:
Today, I finally upgraded my 13-inch 2.16 GHz Core 2 Duo MacBook (2 gig RAM, 160 gig HD) to OS 10.5 from OS 10.4.11. After using install and archive to install the new system, I noticed the Airport signal was down to three bars from the usual four. After completing all the system updates to bring it up to 10.5.8, its still receiving only three bars. We're using a 2Wire wireless DSL modem for Internet service. I was getting the full four bars before the system upgrade, and my wife's 14" G4 iBook is still getting four bars.
Those bars are only an approximation of Wi-Fi signal strength. In Mac OS X 10.5 if you pull down the AirPort menu bar item while holding down an option key you'll see a value "RSSI", which is the actual signal strength. If you were using an AirPort base station, you could use AirPort Utility to see actual signal and noise levels.
In Mac OS X 10.4 I don't think that option key trick works, but you should be able to use the AirPort command-line utility, as describe in the electronic book "Take Control of Your 802.11n AirPort Network" (http://www.takecontrolbooks.com/airport-n):
- Launch Terminal
- Type this command:
cd /System/Library/PrivateFrameworks/\
Apple80211.framework/Versions/Current/Resources/
- Type this command:
./airport -s
You'll see the "RSSI" value in one of the columns. If you compare the "RSSI" values for both OS versions, you may find the "RSSI" values more similar than the AirPort menu bar arcs suggest.
I have no financial connection to Take Control Books.

How to find out the RSSI of a 3g/4g card connected to the RAP?

Environment : This article applies to all Aruba Controller running Aruba OS 5.x and later.
Answer :
The following Remote Access Points RAP 5, RAP 3, RAP 115, RAP 108 and RAP109 supports the use of 3G/4G USB modems for internet Uplink. These modems extend client connectivity to places where an Ethernet uplink is not feasible. To find out the signal strength that your 3g/4g connected RAP is seeing from the cellular tower,
"show ap debug system-status ap-name <name of ap> | include RSSI" can be used to check the information.
Example:
(M3.arubanetworks.com) # show ap debug system-status ap-name randerson-ap70 | include RSSI
3G Uplink RSSI(in dBm) = -51

Understand there is 3G/4G uplink and wired LAN uplink available, can we check with you whether there is a WIFI uplink available? ____

Measuring signal strength between 2 bridges (1310s)

Hi:
I've been experiencing sporadic connectivity issues (losing association between root & non-root bridges, cannot ping remote bridge) at one of my customer's site. I am looking for a tool that will allow me to measure signal strength or noise ratio between 2 1310 wireless bridges. Does anyone know of any tools that will allow me to gather such information? Thanks for any feedback.

As mentioned above, you can look at the RSSI values; the traditional instrument-of-choice would be something like a spectrum analyzer ($$$ - possible to rent) connected to the antenna.
A spectrum analyzer will give you a sweep of the band and show you the signal strength in terms of db(microvolts) or dBm (power relative to a milliwatt) and will also show any persistent interference. Since you are seeing the direct signal, it can also be used to tweak the aim of the antennas as well (remember that there may also be differences in elevation as well as azimuth, so check the up-down as well as the left-right).
You will usually need someone at the other end to assist in verifying that you are looking at the correct signal.
If your bridges support a mode that permit simultaneous AP & bridge operation, something like NetStumbler (free, http://www.netstumbler.com )can give you signal and interference information. I don't think it supports bridge mode signaling (it might, I don't know), that's why it might be necessary to flip on AP mode for the testing.
Good Luck
Scott

SNR and RSSI Values.

HI ,
What is the tha average ,minimum and maximum values of SNR(Signal to noice ratio ) and RSSI (Received Signal Strength Indicator ) in cisco access points   .
And how it is depends on the client connectivity with the Access point.
Thanks & Regards,
Sinjish.K

I am not really sure what you asking here, but My guess is your trying to get a grasp on what SNR and RSSI
values are how they relate to clients, and how they relate to connectivity. If this is the case read on. otherwise well ingore this post..
SNR (Signal-to-Noise Ratio) is a ratio based value that evaluates your signal based on the noise being seen. So let's look at the components of the SNR and they see how to determine it. SNR is comprised of 2 values and is measured as a positive value between 0db and 120db and the closer it is to 120db the better: Signal Value and Noise Value typically these are expressed in decibels (db).
     So we will look at the Signal (Also known as RSSI) first this value is measured in decibels from 0 (zero) to -120 (minus 120) now when looking at this value the closer to 0 (zero) the stronger the signal is which means it's better, typically voice networks require a -65db or better signal level while a data network needs -80db or better. Normal range in a network would be -45db to -87db depending on power levels and design; since the Signal is affected by the APs transmit power & antenna aswell as the clients antenna (I'll explain this later.)
     Now to the Noise side of this equation, noise is any signal (interference) that is not WiFi traffic such as cordless phones, microwaves, radar, etc. This value is measured in decibels from 0 (zero) to -120 (minus 120) now when looking at this value the closer to -120 (minus 120) is better because that means there is little to no interference. Typical environments range between -90db and -98db.
     So to calculate your SNR value you add the Signal Value to the Noise Value and it generates (or should) a positive number that is expressed in decibels (db); for example lets say your Signal value is -55db and your Noise value is -95db.
                    -55db + -95db = 40db this means you have an SNR of 40, my general rule of thumb is that any SNR above 20 is good.
RSSI (Recieved Signal Strength Indicator) is a more common name for the Signal value; meaning it is the strength that the device is hearing a specific device or signal.RSSI is most common used in bridge links where on client laptops they just call it Signal.
As for your question about the maximum and minimum supported by cisco access points that is hard to answer because the antennas attached to the access points also factor into it. In general the Cisco APs have the following maximum transmit powers: 802.11a/n is 40mw or 14dbm, 802.11b is 100mw or 20dbm, 802.11g is 50mw or 17dbm; although in some cases countries and specific channels can alter these limits.
The last three things I will kind of explain is the EIRP, Free Space Path Loss, and Client side.
EIRP (Effective Isotropic Radiated Power) is the actual amount of signal leaving the antenna and is a value measured in db that is based on 3 things:Transmit Power (db), Cable Loss (db), & Antenna Gain (dbi). To determine EIRP follow this equation: - Cable Loss + Antenna Gain = EIRP. For example we have a Cisco 1242AG access points running at full power with a 6dbi antenna on the 802.11a radio and a 2.5dbi antenna on the 802.11bg radio.
802.11a EIRP = 17db (40mw) - 0db + 6dbi = 23db = 200mw of actual output power
802.11bg EIRP = 20db (100mw) - 0db + 2.5dbi = 22.5db = 150mw (approx) of actual output power
based on the example above in theory if you were to measure it right at the antenna you could get an RSSI of -23 or -22.5 respectively.
Free Space Path Loss is a measure of how much signal power you lose over a given distance typically you lose about 0.020 db per foot in an outdoor or wide open office; doors, walls, glass, and etc. affect this. This is why as you walk away from an AP your signal gets weaker.
All this relates to the client because it determines the signal the client recieves, also keep in mind that when looking at the client you have to account for it's antenna as well. much like the EIRP... So if a client card has a 2 dbi antenna (although they are typically either 0dbi or 2.2dbi) that boosts the incoming signal. as shown here assuming the actual raw RSSI signal being seen is -68db (not the value displayed in the client window).
Actual RSSI + Antenna Gain = Displayed RSSI
-68db + 2db = -66db
I hope all this helps with your question...
Please rate useful posts.
Thanks,
Kayle

AP signal strength

Hi All,
How to get the received signal strength of an access point. Is there is any command?. I have 2 APs in bridge mode. I know the transmitted power (100 mw). I am getting intermittent link failure. To analysis the problem I need to know the received singnal power. How can I find the received power of the other AP? Please help me.
Thanks
Anand

Hi,
Additional Info: To view the recieved signal strength using a web configuration utility
go to Cluster > Session and select a item from the display dropdown list
here it displays several fields including the received signal strength as Received Signal Strength Indication
(RSSI) ranging between 0 and 100.

Looking for VZW 4G tab-cell signal strength widget/app?

The 4G signal strength bars in the task bar of the VZW 4G tab don't quantify the strength of the 4G signal and I'm looking for something that will do better.
For background I have a 4G modem [VL600] and use VZAccess Manager which does give a 4G readout [called RSSI] in db so we know its possible to get a value.
I've searched the market for "cell signal widget" and have tried everything that looked promising-nothing worked on the tab.
Anybody got any suggestions for something that may work?
Thanks.
Jim Kirk

I do not think there is a app that can access and read the 4G (LTE) signal information... This was covered at http://forums.androidcentral.com/verizon-htc-thunderbolt-forums/104759-way-see-4g-signal-strength.html and it was reported that this does not seem to be possible at this time.

Antennas gain and RSSI

Hi,
we are using 1240 AP and now have changed antenna to 1728 (Gain 5.2dBi) to increase signal strength, but as show Wi-Fi scanner (inSSIDer)
RSSI stays the similar with old and new antennas.
What's wrong? in AP configuration I changed diversity and external antennas gain.
Valentina

Hi, I have captured with inSSIDer and Xirrus: both programs show similar results (pictures are attached). Signal strength was measured from one place and it should be higher with higher gain antenna (distance is about 1 m in these pictures, but similar results with longer distance). Should we some addtional configurations in AP - and where if yes?
(the highest blue line in both pictures with dipole and then 1728)
Valentina

RSSI & SNR Value

Hello - It is a conceptual question on Wireless SNR & RSSI subject that needs your expertise to shed some lights.
I learned that, for RSSI is the measurement of Power in RF Singal. SNR is the measurement showing how much stronger the wireless signal. I also learned that It’s typically best practice to have the SNR value 20 to 25 dB’s away from the RSSI value. So for example if our RSSI is -61 we would want our SNR value to be around -86, or if our RSSI is -74 we would want the SNR to be -99.
But when i implemented the Cisco Wireless LAN setup, i am observing the below statistics from the Clients.
RSSI : -52
SNR: 41
How the value of SNR is in Positive. Based on my above learning i expected it to be on Negative number and higher than the RSSI ( >-51).
Can you advice where i am wrong?
Thanks in advance
SAIRAM

SNR and RSSI Values.
Unanswered Question
k_sinjish 4 years ago
HI ,
What is the tha average ,minimum and maximum values of SNR(Signal to noice ratio ) and RSSI (Received Signal Strength Indicator ) in cisco access points   .
And how it is depends on the client connectivity with the Access point.
Thanks & Regards,
Sinjish.K
I have this problem too
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Guys - Here is the excellent explanation from Mr.Kyle. Please comment. Thanks
I am not really sure what you asking here, but My guess is your trying to get a grasp on what SNR and RSSI
values are how they relate to clients, and how they relate to connectivity. If this is the case read on. otherwise well ingore this post..
SNR (Signal-to-Noise Ratio) is a ratio based value that evaluates your signal based on the noise being seen. So let's look at the components of the SNR and they see how to determine it. SNR is comprised of 2 values and is measured as a positive value between 0db and 120db and the closer it is to 120db the better: Signal Value and Noise Value typically these are expressed in decibels (db).
So we will look at the Signal (Also known as RSSI) first this value is measured in decibels from 0 (zero) to -120 (minus 120) now when looking at this value the closer to 0 (zero) the stronger the signal is which means it's better, typically voice networks require a -65db or better signal level while a data network needs -80db or better. Normal range in a network would be -45db to -87db depending on power levels and design; since the Signal is affected by the APs transmit power & antenna aswell as the clients antenna (I'll explain this later.)
Now to the Noise side of this equation, noise is any signal (interference) that is not WiFi traffic such as cordless phones, microwaves, radar, etc. This value is measured in decibels from 0 (zero) to -120 (minus 120) now when looking at this value the closer to -120 (minus 120) is better because that means there is little to no interference. Typical environments range between -90db and -98db.
So to calculate your SNR value you add the Signal Value to the Noise Value and it generates (or should) a positive number that is expressed in decibels (db); for example lets say your Signal value is -55db and your Noise value is -95db.
                    -55db + -95db = 40db this means you have an SNR of 40, my general rule of thumb is that any SNR above 20 is good.
RSSI (Recieved Signal Strength Indicator) is a more common name for the Signal value; meaning it is the strength that the device is hearing a specific device or signal.RSSI is most common used in bridge links where on client laptops they just call it Signal.
As for your question about the maximum and minimum supported by cisco access points that is hard to answer because the antennas attached to the access points also factor into it. In general the Cisco APs have the following maximum transmit powers: 802.11a/n is 40mw or 14dbm, 802.11b is 100mw or 20dbm, 802.11g is 50mw or 17dbm; although in some cases countries and specific channels can alter these limits.
The last three things I will kind of explain is the EIRP, Free Space Path Loss, and Client side.
EIRP (Effective Isotropic Radiated Power) is the actual amount of signal leaving the antenna and is a value measured in db that is based on 3 things:Transmit Power (db), Cable Loss (db), & Antenna Gain (dbi). To determine EIRP follow this equation: - Cable Loss + Antenna Gain = EIRP. For example we have a Cisco 1242AG access points running at full power with a 6dbi antenna on the 802.11a radio and a 2.5dbi antenna on the 802.11bg radio.
802.11a EIRP = 17db (40mw) - 0db + 6dbi = 23db = 200mw of actual output power
802.11bg EIRP = 20db (100mw) - 0db + 2.5dbi = 22.5db = 150mw (approx) of actual output power
based on the example above in theory if you were to measure it right at the antenna you could get an RSSI of -23 or -22.5 respectively.
Free Space Path Loss is a measure of how much signal power you lose over a given distance typically you lose about 0.020 db per foot in an outdoor or wide open office; doors, walls, glass, and etc. affect this. This is why as you walk away from an AP your signal gets weaker.
All this relates to the client because it determines the signal the client recieves, also keep in mind that when looking at the client you have to account for it's antenna as well. much like the EIRP... So if a client card has a 2 dbi antenna (although they are typically either 0dbi or 2.2dbi) that boosts the incoming signal. as shown here assuming the actual raw RSSI signal being seen is -68db (not the value displayed in the client window).
Actual RSSI + Antenna Gain = Displayed RSSI
-68db + 2db = -66db
I hope all this helps with your question...
Please rate useful posts.
Thanks,
Kayle
SAIRAM

Connect a Bluetooth device in Windows to a Bluetooth Device in Linux to obtain the RSSI

Here's the situation. I have looked through the forums for information on this question. I do understand there are some compatibility issues between Windows and Linux, hopefully this is easy enough to not be a problem.
I'm trying to acquire the RSSI (Received Signal Strength Indicator) for a Bluetooth card - any card for that matter. Windows Native Drivers will not allow me to access this information through the HCI commands, I've looked. However, Linux does, it's easy, and I now know how. The plan is to get the Windows Bluetooth card to communicate with the Linux Bluetooth card and have the Linux box send the RSSI information to the Windows box.
This program, which I've been working on, needs some help. I would like to put it up to test tomorrow afternoon - when I get off from work. I would like to get some recommendations and suggestions on how to fix the empty parts. And if there's a better way of doing this.
This program is part of another program written in Labview for image recognition.
Attachments:
bluetoothRSSI.vi ‏41 KB

I haven't worked with BT, so I'll assume the basic connection works (you open a connection and you get the data). I'm also assuming the linux box isn't running LV (if I remeber correctly, BT in 7.1 is only supported on windows XP).
So, to comment on your code:
1. I dislike flat case structures which span across multiple screens. I prefer using stacked ones if necessary. This is obviously matter of personal taste and screen resolution, so it's just an obsrvation.
2. Your connection will run not once for each connection, but until it encounters an error.
3. I made a few other quick modifications. They're ugly, but they should set you on the right path. I may have missed some of your notes.
Try to take over the world!
Attachments:
bluetoothRSSI[1].vi ‏58 KB

Does LabView display the Bluetooth signal strength when running on Windows XP?

I am interested in getting the Bluetooth signal strength in a Windows XP application. I would like to use the Microsoft bluetooth drivers for my application. First, Does LabView display the Bluetooth signal strength when running Windows XP? Secondly, If it does what Windows API(s) does it use to get access to this information?

Hi,
It does not seem like the Bluetooth VIs allow you to display the signal strength and I can definitly enter that as a product suggestion for the Bluetooth functionality in LabVIEW. For now, I would suggest going through the Windows API and searchingn for RSSI - Received Signal Strength Indication. I did not have a lot of luck in my searches through Microsoft, but you can give that a shot and post back with any more headway you make.
Also, you can try going to SourceForge.net. Just doing a search for Bluetooth and RSSI popped up several hits of code that has been developed for Bluetooth applications. Then, you can see about creating a DLL call to a particular function that will return RSSI information to you, to which
you can then use in LabVIEW with the Call Library Node.vi.
Hope this helps and best of luck!
Kileen C.
NI

What is RSSI , SNR and technical specification value in dbm

Hi,
I am little bit confused about RSSI concept and SNR , Signal strength.
One more thing that , what is technical specification of signal strength and SNR and RSSI for 802.11 a,b,g and n
Because as far as application concern , this values get changed eq. voice , video
I need to get the values according to application.

Hi,
RSSI means Receiver Signal Strength Indicator. It's the strength of the signal as perceived as received by the client. It does not have a precise unit of measurement. On client softwares, it's usually a percentage (that has no real meaning). WLC and APs usually show in dbm.
SNR is Signal/Noise ratio. The noise level is usually at -90dbm let's say. This means that if you have a signal at -90dbm, it's completely lost in the noise, it has a SNR of 0.
A signal at -80dbm has a SNR of 10 in the same conditions, it is barely decodable.
However if the noise level is -95 then a signal of -80 will give a SNR of 15 and will be much more decodable.
Noise is usually between -100 and -90 in normal circumstances.
Dbm is another way of expressing power (rather than milliwatts). The advantage of dbm is that you can add or substract antenna gains very easily since those are in db.
20dbm=100mw
The rule is "if you substract 3dbm, divide the mw by 2" and "if you substract 10dbm, divide the milliwats by 10"
So 17dbm = 50mw
13dbm=25mw
10dbm=10mw
The received signal strength which are usually between -40 and -80dbm are then fractions of fractions of microwatts :-)

Airport menu signal strength

I'm wondering why I can't see my wifi network signal strength in Airport menu when I am at home on an Airport Extreme router, but when I'm at work on a Linksys router I can?
See the following link for a visual explanation.
files.me.com/jefflessard/ynayiw
any help is appreciated,
regards,
Jeff

J-F wrote:
I'm wondering why I can't see my wifi network signal strength in Airport menu when I am at home on an Airport Extreme router, but when I'm at work on a Linksys router I can?
That is a little odd. The signal strength is described numerically by the value of "RSSI" and is shown graphically by the fan in the menu bar, but there is no fan to the right of the network name. What do you see if you use your mouse to follow the right-pointing triangle to the right of "Airport"?

Rssi strength

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