Dynamic Bandwidth Channel Access or DBS (Cisco)

Instead of a post, I created a short interesting video about the behavior in RF when DBS kicks in.Actually, I created this video in the first place for my internal class, to show colleagues the effect on utilization from other frequencies. But we can here also see the DBCA (Dynamic Bandwidth Channel Access ) behavior […]

WiFi is down, what change did you make?

This weekend I got a call from an educational institute. The WiFi was down. They use an SDA fabric with a fabric-enabled Cisco 9800 WLC for their wireless. The incident occurred right after they made a change from DNAC to push new radius servers to the WLC. The problem was that no client station could […]

Testing RTLS in a non RTLS environment

RTLS (Real Time Location Services) incorporates identification, location, and timing—what, where, and when. The term RTLS generally encapsulates systems providing proximity-based data or actual coordinates In essence, RTLS shows the what, where, and when within a defined locale, quantifying these factors in a way decision-makers can understand. For instance, RTLS could be used to show […]

Wi-Fi Latency requirements

Voice calls require no more than 50% of airtime (PHY) to be used ( including voice calls) on the medium. It should in basics not exceed 50%. So why is that? Because the devices that do the voice call should be on and off the medium fast. If they need to wait it may exceed […]

What we need to know about the standard-power AP class

What we need to know about the standard-power AP class. Last time I wrote a small article about LPI (Low Powered Indoor) and one of the benefits the 6Ghz band brings to us. So what about the second type of device class type? SP (Standard Power) With LPI APs, it doesn’t matter what channels or […]

Cisco Spaces VS CMX counting difference

With the cloud adapting era and the high energy prices a lot of companies to moving their solutions to the cloud.

6Ghz benefits with Power Spectral Density

Wi-Fi 6e gives us a fresh low noisy floor and 24x 20mhz channels to play with in Europe. Currently, there are classes of Wi-Fi 6e Access Points (APs). There is “Standard Power” and Low Power Most APs that hit the market in Europe currently only support Low Power AKA LPI (Low Power Indoor). The change […]

BLE on sidekick spectrum view

BLE’s advertising channels are 37, 38, and 39, and we also see something between 8-9 that’s actually also BLE but one of the data channels, and you see current data go over it. There are actually more data channels used by BLE as well as Zigbee, here is an illustration

CWAP – From the Physical to Data link layer.

I’m currently studying for my CWAP (Certified Wireless Analysis Professional exam.so I need to write something down otherwise it will fright my mind basically. The Mac and LLC header, inside the frame you can see both. Wireless works in the Physical and part in the data link layer ( it does the hand of their […]

Remote Spectrum analysis with Cisco

When there is a problem with a wireless client, and you have determined the coverage is good. A look into the spectrum to troubleshoot the layer 1 characteristics is a good start.This we do to rule out or find any interference on the spectrum. For that we use Chanalyzer. It comes with an accessory to […]