Question

Problems with Realtek wireless adapters, 10.41.12.0006, AP3705i

  • 14 June 2019
  • 3 replies
  • 363 views

C35 Controller running 10.41.12.0006
AP AP3705i
Client: Lenovo A485, Windows 10Pro - Realtek 8822BE chipset

We have issues with some clients that have Realtek chipsets when they are on 5ghz and associated with the 3705 AP. They experience extremely high latency: ping times to the nearest switch on the network over 2 seconds. Also some clients are not always able to connect after being off the network for a while.

The clients when at a different site with newer APs(38xx,39xx)) do not have this problem. We'd like to get this solved without having to buy new APs because the 3705 is still supported.

Example:

Suspend laptop. Resume next day.

Windows unable to get a working connecton.

Proto: 5.0n|L,W
RSS: -56
Avg.Rate(Mbps)/Sent/Rec'd: 300/100
Ping time to switch: 1000-2500ms

Disassociate laptop from controller. Laptop does not connect again(Windows 10 doesn't bother trying to reconnect).
Force reconnection from client. Works.

Proto: 5.0n|L,W
RSS: -55
Avg.Rate(Mbps)/Sent/Rec'd: 254/80
Ping time to switch: 500-2800ms

Disassociate. Force reconnection.

Proto: 5.0n|L,W
RSS: -55
Avg.Rate(Mbps)/Sent/Rec'd: 254/80
Ping time to switch: 100-1000ms

Forcing laptop adapter to use 802.11b/g/n on 2.4ghz fixes problem.

802.11b/g/n(2.4)
Proto: 2.4n
RSS: -57
Avg.Rate(Mbps)/Sent/Rec'd: 104/172
Ping time to switch: <5ms

3 replies

Userlevel 7
The 37xx ap's are end of SW support as of December 2018, we won't be coding any future fixes.

Have you been able to update the Realtek drivers to the latest from the Lenovo site?
Ah, I missed that. We'll need to get these on next year's budget.

Yes, the drivers are up-to-date.

I was hoping there were some radio parameters that I could try tweaking.
Userlevel 4
Hi,

try this settings.

disable MFP if enabled.(WLAN Service)
Disable 11k if enabled(WLAN Service)
Radio settings- advanced:
Set DTIM to 1
Enable protection RTC/CTS
Band width try maybe 20Mhz


Good luck.

Regards

Umut Aydin

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