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Maximum Wireless Speed for Cleints with Cisco 5520 Controller and 3802 Series APs

Zohaib Khan
Level 1
Level 1

 

Hi

We have following controller and Access Point in our wireless environment,

 

Model No.    AIR-CT5520-K9

Software Version    8.2.151.0

 

Access Point:

AIR-AP3802E-E-K9

 

We have 2 Gbps internet up-links for these wireless clients, we want to to get maximum download speed. Load on this wireless network is not much, there are approx 150 clients and on each access point there are not more then 20 client and approx 5 Ghz clients but their connection speed maximum 867mbps and total 76 Accesspoints.

 

What setting we can use the get better speed.

 

Thanks

 

We are using Channel Width for 5Ghz is 80MHz and encryption AES.

 

 

 

 

We are using Channel Width for 5Ghz is 80MHz and encrtyption AES.

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Accepted Solutions

Leo Laohoo
Hall of Fame
Hall of Fame

Zohaib Khan wrote: 

We have 2 Gbps internet up-links for these wireless clients, we want to to get maximum download speed.


Ok, this statement requires several factors to be enabled: 

1.  AP3800 is mGIG capable.  The AP must be connected to a "full" mGIG-capable port (not mGIG-lite). 

2.  The switching up to the core (and controller) must be >5 Gbps.  

3.  How "dirty" is the 802.11ac channel (noise, SNR, RSSI, etc.). 

4.  Distance between wireless client(s) and the AP(s). 

5.  Wireless NIC antennas and "full" 802.11ac compliant (not 802.11ac NIC card with just one antenna). 

6.  Wireless client battery size/power and CPU. 

 

The wireless client may say it's 802.11ac "complaint" but, in serious terms, they seldom can push > 200 Mbps.  Why?  Battery life, CPU and the number of antennas.  The higher the throughput, the bigger the CPU and battery requirement.  I'm going to sound like Yoda, but high CPU means high thermal effects, high thermal effects equates to high power consumption (think battery), large battery means it won't fit in the palm of your hand and you'll need asbestos gloves just to hold it or protect your "family jewels" from becoming eggs benedict.  

View solution in original post

3 Replies 3

Mitch D
Level 1
Level 1

867 mbps is pretty good. Most of your clients are not going to support the very high throughput data rates.

 

You need wifi adapters that support 3 or 4 spacial streams which are pretty rare.

 

Check this out for channel width and spacial streams correlation to theoretical data rates. 

Hello,

 There are some things to consider here.

First lets consider your AP maximum capacity. 3802 AP is a Wave 2 802.11ac Access Point. According to the attached, it can gets in 5.0 GHz with 80 MHz channel and 3 spatial Streams and 256 QAM a Data rate of 2.34 Gbps up to 3.47 Gbps. In terms of Throughput it can gets 1.52 Gbps up to 2.26 Gbps. The Throughput is lower because we have network overhead.

 But, most important, to achieve this level of speed you need to have optimal Wireless condition. In terms of coverage, you need to have at least -64 dBm which means to be almost standing under the Access Point with no interference.

 Another thing to consider is Client Capacity. Usually, 3 Spatial Stream is very difficult to see out there. Probably does not exist in Smartphone yet. You may see this in powerful Laptops.

 That´s it. You can get more then 1 Gbps Throughput but considering all this requirements.

 One more thing, here we are talking about Air interface speed, I mean, communication between client and Access Points. Of course, if you have 150 and 2 Gbps you need to divide this 2 Gbps per 150 to give you an idea how fast you can surf on the web. This is not a perfect rule considering that each application have different demand. 

 

-If I helped you somehow, please, rate it as useful.-

Leo Laohoo
Hall of Fame
Hall of Fame

Zohaib Khan wrote: 

We have 2 Gbps internet up-links for these wireless clients, we want to to get maximum download speed.


Ok, this statement requires several factors to be enabled: 

1.  AP3800 is mGIG capable.  The AP must be connected to a "full" mGIG-capable port (not mGIG-lite). 

2.  The switching up to the core (and controller) must be >5 Gbps.  

3.  How "dirty" is the 802.11ac channel (noise, SNR, RSSI, etc.). 

4.  Distance between wireless client(s) and the AP(s). 

5.  Wireless NIC antennas and "full" 802.11ac compliant (not 802.11ac NIC card with just one antenna). 

6.  Wireless client battery size/power and CPU. 

 

The wireless client may say it's 802.11ac "complaint" but, in serious terms, they seldom can push > 200 Mbps.  Why?  Battery life, CPU and the number of antennas.  The higher the throughput, the bigger the CPU and battery requirement.  I'm going to sound like Yoda, but high CPU means high thermal effects, high thermal effects equates to high power consumption (think battery), large battery means it won't fit in the palm of your hand and you'll need asbestos gloves just to hold it or protect your "family jewels" from becoming eggs benedict.  

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