Since the beginning the Access Point market has used tight controls to ensure they follow all applicable laws for RF broadcasting. Even in the era of software defined radios, export compliance requires strict adherence to country laws. This is why AP’s from Cisco have had part numbers applicable to various countries and regulatory domains. More part numbers often equates to more complication.
Now, with Cisco’s Universal Domain Access Points, you can order an AP that can be regulatory domain agnostic. This is a great blog From Sam Clement that describes how to tie a Universal Domain AP to a regulatory domain.
Please take 17 minutes and watch this Ted talk. Sakena Yacoobi has a heart-warming story about how education changes hearts that could have ended short in tragedy many times.
What Sakena shares is not a unique problem in 3rd world countries. It’s a problem in the United States and unfortunately right in my own community. And in your community, too.
Seek not to force your opinion on someone not ready to understand it. Educate and continue support education in your own community and around the world. Thank you Sakena Yacoobi.
“Horses 2” by Steve – originally posted to Flickr as Horses 2. Licensed under CC BY 2.0 via Commons.
I learned recently that horses having eyes on the sides of their heads means they were historically hunted in nature. Like rabbits, they rely on peripheral vision to detect dangers.
When a horse is racing or pulling a carriage, they can get easily get distracted or startled. So this is why they are outfitted with blinders (sometimes called blinkers). To focus their vision to the front, so they don’t get distracted. This reminded me of a problem we tend to have in the WiFi world.
Yes, I’m saying AP’s are kinda like horses. -Jason Grant
Don’t believe me? Consider the following example:
Here we have a decent sized floor with WiFi designed to support a large number of users and devices. Just for this example, we’ll use 2.4 GHz, where we only have 3 non-overlapping channels: 1, 6, & 11. To make it easy to see, I’ve colored the AP’s with the same channel.
See that part I circled in red? This is an area that is covered by multiple AP’s that are using the same channel. in a blog article described it well.
Remember, an AP is like a horse. It has great peripheral vision. It can hear client devices, on the same channel it’s on, that are actually connected to a different AP! See the trouble? An AP needs to read in all client transmissions on it’s channel, even if it’s a transmission intended for a different AP.
Eeek! What do we do? In comes another Cisco Wireless feature called Rx-SOP. This stands for Receiver Start of Packet. Since the marketing folks haven’t come up with a fancier name, I’ve come up with a cool-looking logo for it. What do you think?
How is Rx-SOP like putting blinders on a horse? Great question. Just like blinders restrict a horses vision to just what the operator thinks is important (straight ahead), Rx-SOP allows an AP to ignore incoming packets that aren’t strong enough. This effectively allows you to shrink your AP cell size to minimize co-channel interference.
How to Turn Rx-SOP On
First thing to remember is that Rx-SOP shrinks your effective coverage area. If you shrink it too much you’ll make coverage holes.
|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|
To configure the RX-SOP threshold go to Wireless >Advanced > Rx Sop Threshold. By default Rx-SOP is on “auto” which means it’s effectively off. Each radio is set to Auto, Low, Medium, or High.
The level you set hear instructs the AP to literally ignore incoming packets that are quieter than the configured level.
If you want to use Rx-SOP for only a few AP’s you can use RF profiles. How to do that is described in the High Density Experience (HDX) Design Guide.
Cisco is urging customers to create a Smart Licensing Account today! Smart Accounts will soon be required in order to place orders for products with Smart Licenses. (Pretty smart, eh?)
They are rolling out a mechanism to administer and utilize software licenses. It’s called a Smart License and some products already take advantage of it.
In the first part of calendar 2016, Cisco’s wireless products including controllers, management, and policy will begin to use Smart Licenses.
Smart Licensing is different from CiscoOne. Think of Smart Licensing as the means by which CiscoOne licensing – and other Cisco licensing – is administered and managed.
Smart Licensing is administered via a Smart Account, which is similar to your Cisco.com account. Here’s the starting point for information on Smart Accounts and Smart Licensing: http://www.cisco.com/web/ordering/smart-software-manager/smart-accounts.html. Here’s a page of YouTube videos describing Smart Licensing, Smart Accounts and how to set up a Smart Account: https://www.youtube.com/channel/UCABaWsiDScw_w6kvPcDIjHw
When product orders are placed in Cisco Commerce Workspace (CCW), a Smart Account must be identified!
Please create a Smart Account now and avoid order-entry issues in the coming months.