Variables Impacting Performance - Cisco Aironet 1850 Series Deployment Manual

Revised: January 25, 2017,

Variables Impacting Performance

Some early observations show that USB clients can appear to be a bit slow in performance depending on drivers, USB port versions,
and so on. Also, it is observed that some clients have trouble in maintaining an 80 MHz bandwidth in the Dynamic Frequency Selection
(DFS) bands. Table 6: List of 802.11ac Clients and Driver Versions, on page 46
testing.
Table 6: List of 802.11ac Clients and Driver Versions
Spatial Streams
Samsung Galaxy S4 1ss
HTC One 1ss
Linksys AE6000 1ss
2ss
MacBook Air
2ss
Intel 7260
Edimax EW-7822UAC 2ss
Linksys WUMC710 3ss
MacBook Pro 3ss
Wi-Fi is a highly variable technology and there are many factors that could impact performance. Few examples are: environment,
client, channel, AP placement, and client distance from the AP.
Is the spectrum clean?
If you are not seeing the results you expect, you need to first check the coexistence with other Wi-Fi networks. Also, you need to
ensure the entire 80 MHz wide channel or whatever you have bonded together is clear. The easiest way to confirm this is to put your
3600/3700 into SE Connect mode and have a look on Spectrum Expert or Metageek Chanalyzer Pro. This will allow you to see Wi-Fi
and non-Wi-Fi interference on all channels.
What client are you using?
The client will have a big impact on performance. First, you need to check if the client is 1, 2, or 3 spatial stream? Then, check the
interface used? A USB 3.0 client performs much better than a USB 2.0 client. Integrated radios are the best of all, because they can
take advantage of a fast bus speed as well as the built-in antennas of the device. So, it is recommended to use devices such as the
Samsung Galaxy s4 (1x1) or the Apple MacBook Air (2x2) over USB clients. We certainly recommend USB 3.0 products over USB
2.0 products.
46
Interface DFS
Integrated Yes
Integrated Yes
USB 2.0 Yes
Integrated Yes
Mini PCIe Yes
USB 3.0 Yes
Bridge No
Integrated Yes
lists the clients that had reasonable success during
Driver
4.1.2
4.1.2
5.0.7.0
10.8.4
16.1.5
1024.2.618.2103
1.00
10.9