802.11a/n; High latency when Channel Bonding is turned on

Unanswered Question
Feb 11th, 2010

AP Type       LWAPP
AP Model     AIR-LAP1252AG-A-K9
IOS Version     12.4(21a)JA2
Radio Detail :  802.11b/g/n  AIR-ANT2422DG-R
Radio Detail :  802.11a/n    AIR-ANT5140V-R

Atheros AR5009 802.11a/g/n


AP - WPA2 AES eap-fast 5.0GHz/54Mb Bonded Channels

Client - WPA2 AES eap-fast 5.0GHz/54Mb Bonded Channels


Getting High Latency when Bonding Channels as well as packet loss.

When unbonding the channels the Latency and Packet loss is minimal.

Ping times: Bonded Channels

Minimum 1ms / Maximum 2765ms / Average 189ms

Packets lost out of 1000 = 509

Ping Times: Unbonded Channels

Minimum 1ms / Maximum 115ms / Average 3ms

Packet's lost out of 1000 = 3


Why do we care? I want to use Bonded Channels to increase throughput.

These Clients are viewing large image files and they need to load quickly.

Thanks for your assistance!


I have this problem too.
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Leo Laohoo Thu, 02/11/2010 - 13:30

From the main page, if you click on "Clients" and the client's MAC address, what is the Signal Strength and the Noise level?

Michael Garcia Thu, 02/11/2010 - 15:29

is this what you're asking for? Also the AP is located within 30 feet away at the most.

Client RSSI is -81dB

Client SNR is 17

i've opened a TAC case. I'm about to deploy 140 devices and I need this working
ASAP. So in the interest of time... I'll post the results of our disgnostics with TAC once this

is complete. Thanks gang!


Leo Laohoo Thu, 02/11/2010 - 15:48

You got this right Michael and the result is not good.  -81dBm Signal Strength and 17 SNR is not a good sign.  It sounds like the client is too far away from the AP or there could be obstacles blocking between the AP and the client.  A good Signal Strength is -65 dBm or lower is better and 25 dBm or higher is better for the SNR.  I could be wrong. 


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