I am not really sure what you asking here, but My guess is your trying to get a grasp on what SNR and RSSI. RSRQ 3GPP DefinitionReference Signal Received Quality (RSRQ) is defined as the ratio N×RSRP/(E-UTRA carrier RSSI), where N is the number of RB’s of the E-UTRA carrier RSSI measurement bandwidth.The measurements in the numerator and denominator shall be made over the same set of resource blocks. 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. As you may have heard, Cisco made the decision to End-of-Sale (EOS) these products last month. A range test was implemented in an indoor environment for 8 meters, one measurement each 1 meter to know the behavior of RSSI vs distance. There is a very long a detailed explanation that could be put forth, but the from a more simple perspective is that industry wide and IEEE Specifications dictate that transmit power is generally expressed as a Positive Number greater than 0 thus the EIRP is measured in Positive dBm, but the same Industry and IEES Specifications dicate that the RSSI or Received Signal Strength as well as Signal be expressed as a Negative Number.. Why they chose to do this is not a simple answer; I admit that as a result it makes it very confusing for some people. As far as I understand, RSSI determines quality of how measurer "hears" the object being measured. 802.11ac - VHT MCS, SNR and RSSI 800ns 400ns 800ns 400ns 800ns 400ns 800ns 400ns 0 BPSK 1/2 6.5 7.2 2 -82 13.5 15 5 -79 29.3 32.5 8 -76 58.5 65 11 -73 1 QPSK 1/2 13 14.4 5 -79 27 30 8 -76 58.5 65 11 -73 117 130 14 -70 2 QPSK 3/4 19.5 21.7 9 -77 40.5 45 12 -74 87.8 97.5 15 -71 175.5 195 18 -68 As far as what is SNR vs RSSI vs ERROR, I will do my best to explain. It has become my one stop shop for quickly determining the SNR requirements for a required throughput (I lie, there are two charts, one for 802.11n and one for 802.11ac.) The RSSI is measured in dBm and is a negative value. There is a concept known as the Signal to Noise Ratio or SNR, that ensures the best wireless functionality. !It's no physically possible that! RSRP, RSRQ, SINR) are also mentioned. And SNR is simply how much RSSI is better than Noise. Any wifi analyzer application on my Android show me RSSI negative values always.Near antenna router value is about -20dBm and far away vaue is about -60dBm.If I convert them in positive value it's phisycally impossible. -55db + -95db = 40db this means you have an SNR of 40, my general rule of thumb is that any SNR above 20 is good. published data rate. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 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. To convert the value of the RSSI register to the real RSSI value just apply the next formula: Rssi_Value = - Rssi_Register / 2. 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. I am hoping that someone may know of an updated table with additional 802.11n data rates that goes up to 300Mbps), http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#q26, Please,can you explain me why with an EIRP of +22.5 dBm/+23 dBm the RSSI is -22.5 dBm or 23 dBm near antenna?Why there is a negative number?thanks. Voice over Wi-Fi handsets are the most common devices that use this criterion, but some handheld data terminals also recommend uniform SNR as a best practice. I think the crux of the issue here is not fully understanding or appreciating the *significant* loss of RF power as it actually transitions from the transmitting antenna element, through the air, and induced into the receiving antenna element. The difference is that RSSI is a relative index, while dBm is an absolute number representing power levels in mW (milliwatts). Ok if my application show me a -20dBm value near to antenna and I consider it as +20dBm then ok ,but if my application show me a -60dBm value far away from antenna router I can't consider it as +60dBm value because it's physically impossible!!! At Aruba, we believe that the most dynamic customer experiences happen at the Edge. SNR is signal to noise ratio. EEM Scripts to Enable/Disable the RLAN Ports on APs Connecte... An End of an Era for Cisco AireOS Controllers. 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. This is why as you walk away from an AP your signal gets weaker. The closer to 0 the better the signal is. 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. Rather it is a relative number that measures how strong a signal is when it's received by a device and it's heavily influenced by many factors. : This article applies to all Aruba controllers and ArubaOS versions. Signal is measured by the receive signal strength indicator (RSSI), which in most cases indicates how well a … This conversion provides for maximum convenience and consistency during the planning process. - Rosalind Franklin, Scott Olsen Our mission is to deliver innovative solutions that harness data at the Edge to drive powerful business outcomes. SNR is also related to RSSI. SNR ¶ Signal-to-Noise Ratio (SNR) is the ratio between the received power signal and the noise floor power level. Please,explain me theoretically with physics why there are 40db attenuation from tx antenna (eirp +20dBm) to rx receiver( -20dBm) when the distance each other is very very near (near field) and frequency is about 2500MHz.Thanks. However, as the number of APs that need to have their RLAN... It’s been a long road for our AireOS wireless controllers. Best point to remember; values greater than 1mW are expressed as positive dBm values, and energies *less than* 1mW are measure in negative values. The following post has the "short version" published by Cisco: https://supportforums.cisco.com/thread/2055709. Noise are the signal you don't want. RSSI level less than -80dBm may not be usable, depending on noise. SINR/SNR – The signal-to-noise ratio of the given signal. Therefore, the greater the RSSI value, the stronger the signal. (Part of Webinar 4). RSRP – The average power received from a single Reference signal, and Its typical range is around -44dbm (good) to -140dbm (bad). Received Signal Strength Indicator (RSSI) is an estimated measurement of how good a device can hear, detect and receive signals from any access point or from a specific router.A signal is indicated through RSSI. This allows the wireless designer to minimize the number of units that are being worked with. For example, for 2 spatial streams, and an 80 MHz channel, to get an MCS of 5 you need at least 24 dBM of SNR or -60 RSSI. 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 . How does RSSI, SNR, SINR, RSRP affect data rate and cell capacity? SNR margin = signal(dBm) - noise(dBm) E.g. RSRP does a better job of measuring signal power from a specific sector while potentially excluding noise and interference from other sectors. 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. Depending on your OS and application, WiFi signal strength is represented either as quality in percentage, or an RSSI value in dBm, i.e. The problem was following : if eirp of router is +20dBm then why RSSI is -20dBm very very close to the router antenna? Considering RSSI is 'Signal + Noise' or 'Singal + Noise + Interference', you would novice that RSRQ is very similar to the definition of SNR or SINR which are the most common indicators of signal quality. The Receive Sensitivity/RSSI requirements have been compiled from various sources and should only be used as a guide as each vendor radio will have their own specifications. 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