Editor’s Note: This is the last of a four-part deep dive series into High Density Experience (HDX), Cisco’s latest solution suite designed for high density environments and next-generation wireless technologies. For more on Cisco HDX, visit www.cisco.com/go/80211ac. Read part 1 here. Read part 2 here. Read part 3 here.
If you’ve been a long time user of Wi-Fi, at some point you have either observed someone encounter (or have personally suffered from) so called “sticky client syndrome”. In this circumstance, a client device tenaciously, doggedly, persistently, and stubbornly stays connected to an AP that it connected to earlier even though the client has physically moved closer to another AP.
Surprisingly, the reason for this is not entirely…errr…ummm…unreasonable. After all, if you are at home, you don’t want to be accidentally connecting to your neighbor’s AP just because the Wi-Fi device you’re using happens to be closer to your neighbor’s AP than to your own.
However, this behavior is completely unacceptable in an enterprise or public Wi-Fi environment where multiple APs are used in support of a wireless LAN and where portability, nomadicity, or mobility is the norm. In this case, the client should typically be regularly attempting to seek the best possible Wi-Fi connection.
Some may argue that regularly scanning for a better Wi-Fi connection unnecessarily consumes battery life for the client device and will interrupt ongoing connectivity. Therefore the “cure is worse than the disease”. But this is true only if the client is very aggressively scanning and actually creates the complete opposite of being “sticky”.
The fundamental issue with “stickiness” is that many client devices simply wait too long to initiate scanning and therefore seeking a better connection. These devices simply insist on maintaining an existing Wi-Fi connection even though that connection may be virtually unusable for anything but the most basic functionality. Read More »
Tags: 3G, 4G, access point, AP, beacon, cellular, client, connection quality, device, environment, experience, feature, HD, HDX, high density, IT, LAN, mobile, mobility, monitor, network, performance, retransmission, roaming, solution, sticky client, sticky client syndrome, usability, user, wi-fi, wifi, wireless, wlan
Editor’s Note: This is the second of a four-part deep dive series into High Density Experience (HDX), Cisco’s latest solution suite designed for high density environments and next-generation wireless technologies. For more on Cisco HDX, visit www.cisco.com/go/80211ac. Read part 1 here. Read part 2 here.
The 802.11ac wireless networking standard is the most recent introduction by the IEEE (now ratified), and is rapidly becoming more accepted and reliable industry standard. The good news is that the client and vendor adoption rate for 802.11ac is growing at a much higher pace as compared to when 802.11n was introduced back in 2009. There has been an accelerated growth seen with the mobile and laptop devices entering the wireless market embedded with an 802.11ac WiFi chipset. Unlike in the past, laptop, smartphone and tablet manufacturers are now acknowledging the fact that staying up to date with the latest Wi-Fi standards is as important for the bandwidth hungry users as having a better camera or a higher resolution display.
With the launch of the new 802.11ac AP 3700, Cisco introduces the Cisco HDX (High Density Experience) Technology. Cisco HDX is a suite of solutions aimed towards augmenting the higher performance, more speed and better client connectivity that 802.11ac standard delivers today.
ClientLink 3.0 features as an integral part of Cisco HDX technology designed to resolve the complexities that comes along with the new BYOD trend driving the high proliferation of 802.11ac capable devices.
So what is ClientLink 3.0 technology and how does it work?
ClientLink 3.0 is a Cisco patented 802.11ac/n/a/g beamforming technology Read More »
Tags: 802.11, access point, antenna, AP, beamforming, cell size, Cisco, client, client connectivity, ClientLink, device, downlink, hardware, HD, HDX, high density, IEEE, Industry Standard, LAN, mobile, mobility, network, rf, smartphone, software, solution, tablet, technology, wi-fi, wifi, wireless, wlan
Editor’s Note: This is the second of a four-part deep dive series into High Density Experience (HDX), Cisco’s latest solution suite designed for high density environments and next-generation wireless technologies. For more on Cisco HDX, visit www.cisco.com/go/80211ac. Read part 1 here.
With any new technology comes a new set of obstacles to overcome. 802.11ac is no exception. Last week we talked about CleanAir for 802.11ac and why spectrum intelligence still matters. Another challenge is scalability. In this post I will give you some details on new HDX feature, Turbo Performance, which allows the AP 3700 overcome common scaling issues to scale amazingly well.
What’s Different with 802.11ac?
802.11ac means higher data rates, which means more packets per second (PPS). There are three reasons for more PPS with 11ac: wider channels, increased modulation and increased aggregation. Channel width doubled to 80 MHz, modulation increased from 64 QAM to 256 QAM, and aggregation increased from 64k to 1MB!
With 802.11n, an AP might have had to push 30,000 1500 byte packets per second through the APs data plane. Today with 802.11ac that could now be 75,000+ PPS. More PPS means more load on the APs CPU, so to really keep up with the demands of 802.11ac, we needed to go back to the drawing board. Read More »
Tags: 802.11ac, access point, aggregation scheduler, antenna, AP, byte, Cisco, cpu, data plane, Enterprise, HD, HDX, high density, increased aggregation, modulation, multi-client, network, networking, packet scheduler, packets per second, performance, pps, qam, radio, scale, technology, wi-fi, wifi, wireless
The guys from No Strings Attached Show just published their podcast we sponsored featuring Jim Florwick yesterday and already the verdict is in: Jim Florwick is awesome.
For those of you who haven’t had the chance to download the podcast yet (What are you waiting for?! Download podcast) or you have a few extra minutes to scan a short blog to decide whether or not you want to download the podcast, I asked Jim what his key takeaways are when it comes to high density design.
Here are Jim Florwick’s 6 tips for HD network design (for the REAL meat, tune into the podcast):
- High density client environments are quite common with today’s users being very connected – today’s users are always connected. With planning, this can be managed quite successfully. Understand the limitations, be aware of how legacy requirements will affect the outcome, and set expectations accordingly. Efficiency is key and removing some of the blockers (legacy) first is essential.
- 802.11ac represents another quantum leap forward in technology and will eventually allow a much richer user experience. It is a transition that must be managed and balanced against your current mission requirements. Evaluate channel/bandwidth requirements carefully. Monitor the mix of client devices operating in your environment and update frequently. Read More »
Tags: 11ac, 802.11, 802.11ac, access point, antenna, bandwidth, Cisco, CLI, client environment, design guide, HD, high density, high density design, high density network, jim florwick, legacy requirements, Mhz, Network design, no strings attached show, OBSS requirement, podcast, RRM; DCA algorithm, technology, wireless design
Last week, we announced at Interop-NY our newest Indoor Access Point, the Aironet 3700 Series. This access Point includes an integrated 802.11ac radio and is the first and only access point to support a 4x4 MIMO on 802.11ac. This latest Wi-Fi Standard will provide wireless networks better performance and coverage, and address the demand for client access including 802.11ac enabled clients. Whether you are in Higher Education, K-12, Healthcare, Manufacturing, Retail or other verticals, we are seeing our customers across industries face the same challenges: more users coming onto the network, more users bringing more devices, more devices that are only wireless connectivity (no Ethernet port), more security, OS and application updates on each of those devices. All this drives the larger problem of high density.
Enter the Cisco HD Experience Technology. Available on the new Aironet 3700 Series Access Points, the Cisco High Density Experience or “HD Experience” Technology is a suite of solutions serving up a feature set designed specifically to alleviate the introduction of more clients, bandwidth hungry applications and high density network strain in order to provide an unparalleled user experience.
Here are the top 7 facts to know about Cisco HD Experience Technology:
1. HD Experience Technology is a suite of solutions only available on the AP3700 that helps OPTIMIZE performance, mitigation, scalability and roaming for High Client Density networks
2. HD Experience is a hardware-based solution on a WiFi chipset designed BY and FOR CISCO. This is *not* software features based on merchant silicon WiFi chipset. HD Experience includes…
3. CleanAir 80 MHz, where Cisco fundamentally retooled the award-winning CleanAir technology to provide the same level of granularity and accuracy of RF interference detection and mitigation across 802.11ac’s 80 MHz bandwidth…but it also detects and mitigates for 802.11a/b/g/n clients as well. Read More »
Tags: access point, Cisco, cleanair, ClientLink, HD, high density, network, rf, roaming, technology, wi-fi, wifi, wireless