Rx-SOP
Rx-SOP (Receiver Start of Packet detection threshold) - Rx-SOP determines the wireless signal level in dBm from the
clients and as per the threshold limit, client packets may be processed or
dropped.
For e.g.:- If the threshold is set to -70 dBm and the wireless signals from
the clients are up to -70 dBm, then packets will be accepted and processed (i.e.,
demodulated and decoded at the access point radio). If signal strength from
clients are of less than -70 dBm, then clients packets will be dropped.
-- At
the low threshold, the radio will be more sensitive
and hence larger the cell size.
-- At the
high threshold, the radio will be less sensitive
and hence smaller the cell size; which will ensure that the clients are
connected to nearby access point (this will result in enhanced user experience in
the form of high speed and high throughput at the user side).
In case, Rx SOP is set to high threshold value
–
a. Cell overlapping will be less between the
access points
b. Air time transmission will be less for
clients (and thus more airtime will be available for clients)
All the frames received with low RSSI than
the configured threshold will not be decoded by the access point and dump into
the bin as the noise.
Fig-1 - Global configuration of
Rx-Sop for 2.4GHz & 5GHz
To Configure the Rx-SOP globally for both
the 2.4GHz and 5GHz band --
Go to Wireless>Advanced>Rx-Sop
Threshold>Rx-Sop Threshold 802.11a or Rx-Sop Threshold 802.11b >>>
High; Medium; Low or Auto as per requirements.
High
|
Medium
|
Low
|
Auto
|
|
2.4 GHz
|
-79dBm
|
-82dBm
|
-85dBm
|
Radio Default
|
5 GHz
|
-76dBm
|
-78dBm
|
-80dBm
|
Radio Default
|
Fig-2
Note: Rx-Sop is only supported on the
following models of access points:
- 1552
- 1570
- 1600
- 1700
- 2600
- 2700
- 2800
- 3500
- 3600
- 3700
- 3800
Creating Custom RF-Profiles and configuring Rx-SOP per profile
By creating
custom RF-profiles, we can configure one set of access points of large cell
size and another set of access points which are of small cell size.
Cisco wireless
controller comes with the some pre-configured RF-Profiles that is low client
density, typical client density and High Client Density or we can create our
new RF-Profile as per our requirement and put it on the AP group.
Fig-3
To Create new RF-Profile, Go to
Wireless>RF-Profile and Click New
Give Profile name and select the band
802.11a or 802.11b/g
Fig-4
Fig-5
Go to High Density
tab and select Rx-Sop threshold parameters as shown in Fig-6.
Fig-6
Go to WLANs>Advanced>AP
Groups>Select the AP group on which RF-Profile to be put.
Fig-7
This way we can apply the different
RF-Profiles to different AP groups as per our design.
I hope this is being informative to you and
I would like to thank you for viewing.
References:
[1]http://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-0/hdx_final/b_hdx_dg_final/high_density_experience_features_added_in_release_8_0.html
http://www.revolutionwifi.net/revolutionwifi/2014/08/optimized-roaming-rssi-low-check-rx-sop.html
