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Dell Wireless(DW1530, DW1540) issues with VoIP on 802.11n

We are having issues with VoIP, using Microsoft Lync, over wireless.  We are experiencing static, jitter, dead air, and dropped words during calls.  We have a Cisco wireless infrastructure consisting of a 5508 controller and 2602 access points.  We're currently runng OS version 7.5.102.0, but the issues also occurred when running OS version 7.4.100.0.

On the client side, we've narrowed the issues down to Dell Laptops(Latitude E6430, Latitude D640, Latitude E6420) with Dell Wireless/Broadcom(DW1530, DW1540) network adapters that are 802.11n capable.

Latitude E6430

OS - Windows 7

wireless adapter - DW1540

driver - 5.100.82.112

Latitude D640

OS - Windows 7

wireless adapter - DW1530

driver - 5.100.235.12

Latitude E6420

OS - Windows 8

wireless adapter - DW1530

driver - 6.30.58.26

All of the drivers are the latest offered from Dell.

If we disable high throughput (802.11n) on the access points and force the clients to connect with 802.11a or 802.11g, we don't experience any issues.

If we use another manufacturers 802.11n USB NIC in the same hardware, we don't experience any issues.

This seems to be a compatibility issue between Dell Wireless(Broadcom) 802.11n capable network adapters and Cisco access points.  I'm guessing this issue is with all 802.11n traffic, but we're only noticing it during Microsoft Lync voice calls. 

Has anybody else had this type of problem and found a resolution?

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Dell Wireless(DW1530, DW1540) issues with VoIP on 802.11n

Has anybody else had this type of problem and found a resolution?

I've seen some Intel chips that simply "misbehaves" when operating in 802.11n.  Going to the laptop manufacturer's website to download the firmware is next to useless.  Going to the NIC manufacturer's website to download the LATEST firmware is more reliable.

There's a significant version "gap" between the firmware published with the laptop manufacturer vs the ones with the wireless NIC.

I suggest you go to Broadcom and load the latest firmware in one or two machines just to test.

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