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Cisco Bug: CSCvu18546 - Spartan Client score shows 200%, actual data rate > max capability, spatial stream mismactched

Last Modified

May 25, 2020

Products (1)

  • Cisco 5500 Series Wireless Controllers

Known Affected Releases

8.10(128.106)

Description (partial)

Symptom:
An Ipad2 4c:b1:99:ab:b3:d2 is associating to Vanc 9120I AP.

On Spartan:

MAC Address
4c:b1:99:ab:b3:d2
AP Name
SR13_AP3802.d6e0 (Ch 36)
Nearest APs
Device Type
Apple-iPad
Performance
Signal Strength: -39 dBm Signal Quality: 53 dB Connection Speed: 144 Mbps Channel Width: 20 MHz
Capabilities
802.11n (5GHz) Spatial Stream: 2
Cisco Compatible
Not Supported
Connection Score
200%


Click 200% icon,

Connection Rates
AP Max Configured
289 Mbps
Client Max Capability
72 Mbps
Client Actual Rate
144 Mbps


Spatial Streams
AP Max Configured
3
Client Max Capability
1


Issue 1, 200% is not right. The max is support to be 100%.

Issue 2, The Actual Rate > Mac Capability, this is by far not realistic:
Client Max Capability
72 Mbps
Client Actual Rate
144 Mbps

Issue 3, 
Client page "802.11n (5GHz) Spatial Stream: 2" conflicts to score page "AP Max Configured
3
Client Max Capability
1" for Spatial Streams.

Here is info from google:
an 802.11n network can achieve 72 megabits per second (on a single 20 MHz channel with one antenna and 400 ns guard interval); 802.11n's speed may go up to 150 megabits per second if there are not other Bluetooth, microwave or Wi-Fi emissions in the neighborhood by using two 20 MHz channels in 40 MHz mode. If more antennas are used, then 802.11n can go up to 288 megabits per second in 20 MHz mode with four antennas, or 600 megabits per second in 40 MHz mode with four antennas and 400 ns guard interval.

Conditions:
na
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