--- title: "Cisco RX-SOP Explained: Turning Down the Noise | IPTel" description: What Cisco RX-SOP does, how it de-tunes AP receive sensitivity, and when to use it in high-density Wi-Fi without creating coverage holes. image: https://blog.iptel.com.au/hubfs/Stock%20Images/Blog%20Images/RX-SOP%20-%20Turn%20down%20the%20Noise-feature.jpg --- [![IPTellogo-byline-2020-dark-v2-pnd-optimised-500 (1)](https://blog.iptel.com.au/hs-fs/hubfs/IPTellogo-byline-2020-dark-v2-pnd-optimised-500%20(1).png?width=200&height=59&name=IPTellogo-byline-2020-dark-v2-pnd-optimised-500%20(1).png "IPTellogo-byline-2020-dark-v2-pnd-optimised-500 (1)")](https://iptel.com.au) - [Home](https://iptel.com.au/) - [Solutions](https://iptel.com.au/solutions) Technologies - [Cisco Access Manager](https://iptel.com.au/technologies/cisco-access-manager) - [Cisco Catalyst Center](https://iptel.com.au/technologies/cisco-catalyst-center) - [Cisco Meraki](https://iptel.com.au/technologies/cisco-meraki) - [Cisco SDA Fabric](https://iptel.com.au/technologies/cisco-sda-fabric) - 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[Request a Quote](https://iptel.com.au/request-a-quote) - [Managed Services](https://iptel.com.au/managed-services-enquiry) Case Studies - [DP World Video](https://blog.iptel.com.au/hubfs/Case%20Studies/DP%20World_Case_Study.mp4) - [DP World](https://blog.iptel.com.au/dp-world-case-study) - [Backup Assure](https://blog.iptel.com.au/backup-assure-a-disaster-recovery-case-study) [Contact Us](https://iptel.com.au/contact-us) This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. ## Cisco RX-SOP: How to Turn Down the Noise Mar 27, 2026 Cisco RX-SOP is a feature that de-tunes the receive sensitivity of Wi-Fi Access Points. Essentially what the feature is doing is to tell the AP to ignore transmissions it hears below a certain threshold - it's not removing the traffic from the air, but allowing the AP to ignore it and be able to talk over the top of background noise. ![RX-SOP - Turn down the Noise](https://blog.iptel.com.au/hs-fs/hubfs/Stock%20Images/Blog%20Images/RX-SOP%20-%20Turn%20down%20the%20Noise.png?width=1846&height=1031&name=RX-SOP%20-%20Turn%20down%20the%20Noise.png) If you find yourself in the [unlikely situation that there are too many APs](https://blog.iptel.com.au/how-to-review-a-wifi-installation-part-1), then this is a feature that might help. Incorrect AP density is one of the most common issues in Wi-Fi design - worth a read of our eBook, [The Top 8 Secrets to Great Wi-Fi](https://blog.iptel.com.au/top-8-secrets-to-great-wi-fi), which explains this further. One option for networks with too many APs (or a high density designed network), or with a high density of clients, or noise is to use RX-SOP. Here's the run through of what RX-SOP is - and does. Related reading - [Cisco SD-Access Lab](https://blog.iptel.com.au/cisco-sd-access-lab) - [Software Defined Networking Explained](https://blog.iptel.com.au/software-defined-networking) --- ## Cisco RX-SOP: How does it Work? The RX-SOP feature will effectively tell the AP to no longer listen to traffic below a certain threshold – meaning the AP can start transmitting over the top of what is now considered background noise. In tests, setting RX-SOP to -90dBm only makes a mild difference of around 3% improvement in channel utilisation, so it's not a silver bullet or replacement for proper RF design in the first place. The more aggressive settings will definitely have an improvement on channel utilisation, but to an extent you could consider it as masking an underlying problem. Related reading - [Zero Trust Architecture (ZTA) Introduction](https://blog.iptel.com.au/zero-trust-architecture) - [Zero Trust Architecture (ZTA) Deployment](https://blog.iptel.com.au/zero-trust-deployment) --- ## Cisco RX-SOP: What is it Doing? Let's take the technology out of it for the minute, and look at it a different way. Wi-Fi is really akin to people at a dinner party where everyone at the table takes turns to talk – it would be rude to talk over the top of each other so if someone wants to speak, they wait until everyone else has stopped for a moment. [![Wi-Fi Surveys (Instagram)](https://blog.iptel.com.au/hs-fs/hubfs/Blogs/Wi-Fi%20Surveys/Wi-Fi%20Surveys%20(Instagram).png?width=190&height=190&name=Wi-Fi%20Surveys%20(Instagram).png)](https://blog.iptel.com.au/wi-fi-surveys)If you have a very large group, it could take a long time before everyone gets a chance to talk without anyone else talking. Quite often in a dinner party, multiple conversation groups can break out on a large table simultaneously because humans are able to ignore the background noise of conversations they aren't participating in. APs aren't able to do this if the other conversations are loud enough to make out clearly. RX-SOP is sometimes referred to as "ear-muffs" for APs. It will completely ignore the more distant RF signals and pretend it can't hear them and allow the AP to talk over the top when it would normally wait politely for a moment of silence. Related reading - [MAC Address Converter Tool](https://blog.iptel.com.au/mac-address-converter-tool) --- ## Cisco RX-SOP: Sensitivities RX-SOP will improve the network in the downstream direction (from AP to Client). It will now hear more ‘silence’ giving it more transmit opportunities, as it's ignoring the background traffic. The clients though have not changed their behaviour, so the upstream direction (from Client to AP) remains unchanged (they can still hear everything as they did before) but because they don't have receive sensitivities as high as access points, they already had more perceived "silence" and therefore transmit opportunities than the APs did. | **RX-SOP Setting** | **802.11b** **(2.4 GHz)** | **802.11a** **(5 GHz)** | | --- | --- | --- | | Auto | Radio Default | Radio Default | | Low | -85 dBm | -80 dBm | | Medium | -82 dBm | -78 dBm | | High | -79 dBm | -76 dBm | The table above shows the available settings for RX-SOP, in each of the available bands. When a new client turns on, it will send out a probe. Every AP that hears the client will respond with a probe response detailing the SSIDs it supports. The APs with RX-SOP in operation will not respond to weak probe requests, so this will help improve the channel utilisation. It probably goes without saying that this is a feature that will make no difference unless the network has a dense array of APs. The other alternative is to engineer the network with fewer APs in the first place. If you have a very dense array of APs, you might need to understand how you got there and if that's a relevant design for your business and location. RF Design - and often overlooked, RF Tuning are vitally important to a successful Wi-Fi rollout. Related reading - [RF Design Survey](https://blog.iptel.com.au/wifi-predictive-design-wifi-heatmaps) - [Wi-Fi and the Cinema Story](https://blog.iptel.com.au/wifi-and-the-cinema-story) - [RF Tuning and Access Point Power](https://blog.iptel.com.au/access-point-power-caps) --- ## Cisco RX-SOP: FAQs ### What Is Cisco RX-SOP? Receiver Start of Packet (RX-SOP) tells an access point to ignore transmissions it hears below a set signal level. It shrinks the effective cell size from the receive side. ### When Should RX-SOP Be Used? Mainly in high-density areas such as auditoriums and stadiums, where APs hear too many distant clients and neighbouring cells. It is best applied per RF profile to just the areas that need it. ### Does RX-SOP Remove Interference? No. The other signals are still on the air — the AP simply stops trying to decode weak frames. It reduces contention but doesn't fix a poor channel plan or AP layout. ### What Are the Risks of Setting RX-SOP Too High? Clients at the cell edge can be ignored, causing sticky clients, poor roaming or devices that can't connect. Treat it as a fine-tuning tool, not a substitute for good RF design. --- ## Cisco RX-SOP: Conclusion RX-SOP would be useful as a tool in your bag when you have some high channel utilisation areas to take a few percent out. Beware of the more aggressive settings as you might well affect the way in which clients roam – APs will ignore client probe requests, so as you get more aggressive, you’re more likely to affect the roaming behaviour of a client. This should only be an issue in low density areas such as outdoors where a client may still need to roam to an AP that can only just "hear" it so just be careful to not apply the same RX-SOP settings across an entire site if the site has some very low density areas (use RF profiles to apply different RX-SOP settings to each AP group). For a further discussion on Wi-Fi design, have a read of [30 Technical Wi-Fi Thoughts](https://blog.iptel.com.au/30-technical-wifi-thoughts). OTHER READING: - [What is SDA Fabric](https://blog.iptel.com.au/what-is-sda-fabric) - [SDA Fabric Key Concepts](https://blog.iptel.com.au/what-is-sda-fabric) - [Zero Trust Deployment](https://blog.iptel.com.au/zero-trust-deployment) ### Need Help With Your Wi-Fi? Our [Wi-Fi survey and design team](https://iptel.com.au/services/wi-fi-surveys) designs, surveys and fixes enterprise Wi-Fi across Australia, and the free [AP Estimator](https://iptel.com.au/resources/wifi-access-point-estimator) gives you a first AP count. If that would be useful, [get in touch with the IPTel team](https://iptel.com.au/contact-us) or email [sales@iptel.com.au](mailto:sales@iptel.com.au). #### Related Articles ###### [High-Availability Hospital Wi-Fi Design](https://blog.iptel.com.au/high-availability-hospital-wi-fi-design) Aug 17, 2026 ###### [Aged Care Wi-Fi](https://blog.iptel.com.au/aged-care-wi-fi) Dec 9, 2025 ###### [Wi-Fi 7](https://blog.iptel.com.au/wi-fi-7) Feb 26, 2026 Free tool ### How Many Wi-Fi Access Points Do You Need? Work out APs, PoE and switch ports floor by floor, using the same survey grades our Cisco wireless engineers design to. Takes under a minute. [Try the AP Estimator →](https://iptel.com.au/resources/wifi-access-point-estimator?utm_source=blog&utm_medium=cta&utm_campaign=ap-estimator) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Mark McSherry", "url" : "https://blog.iptel.com.au/author/mark-mcsherry" }, "dateModified" : "2026-10-03T07:40:13.292Z", "datePublished" : "2026-03-27T04:50:16.000Z", "headline" : "Cisco RX-SOP Explained: Turning Down the Noise | IPTel", "image" : [ "https://blog.iptel.com.au/hubfs/Stock%20Images/Blog%20Images/RX-SOP%20-%20Turn%20down%20the%20Noise-feature.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.iptel.com.au/cisco-rx-sop-how-to-turn-down-the-noise", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.iptel.com.au/hubfs/IPTel_Solutions_February2020%20-%20Header%20SiteMap/Images/IPTellogo-byline-2020-dark-v2.png" }, "name" : "IPTel Solutions Pty Ltd" } } ```