0无线WiFi 802.11 ABGN标志已解决: 无线视频流的问题

I have a very strange issue which is causing problems playing videos over a wireless-n network. Playing the videos causes the network to drop out after a short period. Sometimes this only lasts for 2-3 秒, which just causes a video stutter. Other times the drop out is more permanent and takes nearly a minute to recover, unless the wireless radio is switched off and back on, whereupon reconnection occurs.


Running a continuous ping during this results in timeouts when the connection drops. The connection is more likely to recover within 2-3 seconds if the video is paused as soon as the problem occurs. Now the strange part. If I simultaneously copy a large file over the wireless at the same time as playing the video then playback is fine and no drop outs occur! This is affecting a wireless connection between a Draytek Vigor2820Vn and 2 different laptops with Intel 5×00 wireless cards. Both laptops are running Windows 7 x64的. I have also tried with an Intel 6300 Wireless card.

I have so far tested and established the following facts (注: 所有的速度都在比特而不是字节给出)…

Wireless Network Draytek Vigor2820Vn Problems Network Layout

1. The direction of the file transfer doesn’t matter, it can be to the client or from the client (e.g. 从A至C或从C至A). It can also be initiated by the client, or by the other end of the transfer (即. initiated by C).
2. The file transfer can be to a different computer from the source of the video, 或同一, it always has the sameprotectiveeffect. (即. file is streaming from C to A, 文件复制从B到A)
3. Playing just 1 与2Mbps的一个比特率的视频似乎并没有表现出的问题? 2 Videos with a total of 4Mbps do suffer. Videos up to and including 13Mbps all exhibit the same issue. Higher rates haven’t been tested but I expect them to have the same problem.
4. There are no other nearby wireless networks effecting network performance, and file transfers work reliably at approx 70Mbps so the connection is not bandwidth limited.
5. Increasing the buffer in WMP to 30 seconds has no benefit. Furthermore the judders in video playback still occur at the same time as the ping timeouts so the buffer doesn’t even seem to be working?
6. The router firmware is up-to-date, and it has had the wireless board replaced without resolving the problem. The issue also occurred with older firmware.
7. The drivers for the wireless cards are up to date. 这个问题也出现了同样的与旧的驱动程序.
8. When the connection cuts off it cuts off ALL wireless clients, even those not involved in the streaming so the issue *seems* likely to be at the router end of the connection, not the client end? (即. when streaming from C to A, B is also cut off temporarily)
9. 一个网上下载的〜300k/sec (2.4Mbps的) doesn’t offer the same protective effect as the ~70Mbps file transfer.
10. The issue occurs even if the client (一台笔记本电脑) is on battery or plugged in. 因此,它似乎不太可能是电源管理相关?
11. Disabled IPv6 without any benefit
12. Tried streaming video from both Windows 2003 (服务器C上) 和Windows 7 (桌上电脑□) 不改变主机, so problem isn’t related to SMB 2.0
13. Tried playback with a variety of players including Media Center 7, Windows媒体播放器 12 x64的, Windows媒体播放器 12 86, MPC-HC x64的 and VLCall exhibit the problem
14. Upgrading to an Intel 6300 wireless card makes no difference
15. The distance from router makes no difference
16. The problem happens faster the more intense the traffic
17. The problem happens significantly less with a shorter wireless key

My best theory is that the router has an obscure issue where it is reducing wireless speed when it detects that the connection is under low usage, but this low speed state isn’t sufficient for the peaks of required bandwidth in variable bit rate video streams and goes into some kind of error state which is only relieved when the video playback is halted. Copying a file is sufficiently intensive to prevent this state being entered, 但一个网上下载的是不是.

Next I’d like to try one of the laptops with Windows XP as the 操作系统 而不是Win7的, 本书虽然是我不希望这有助于. Then I’d like to try a different router / 无线-N WAP which if my theory is correct will cure the problem. 可悲的是我没有无线-N的来源 WAP 或路由器的时刻.

If anyone has any other ideas for things to try/test, or has a similar problem please get in touch!

更新资料 1 (5/一月-2011)

I’m not the only person experiencing this. Googling shows up a range of other people who have had similar issues but as yet no solutions. List of links below

更新资料 2 (23-三月 - 2011)

I’ve updated various parts of the post, 并增加了一系列的下方链接.

I’m at a point now where I need to test my laptop with a different Wireless-N network. If it works then I think I can conclude there is a problem with my router. If it doesn’t work then there is something wrong with either Intel wireless cards, or with Dell Studio laptops!

http://www.sevenforums.com/network-sharing/110061-windows-7-wireless-connections-drop-out.htmlSound similar, 但不完全一样. My adaptor still sees wireless networks as far as I can tell

HTTP://forums.whirlpool.net.au/archive/1300843Some people saying its Intel cards, but others saying changing card didn’t help. Nothing conclusive.

http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/INTEL-5100-5300-Network-Dropouts-Disconnects/m-p/97708Another speculating about Intel drivers, but still with an unresolved issue, 所以不是非常有帮助

http://forums.smallnetbuilder.com/showthread.php?t=1997&page=3Similar sounding problem with a Belkin router. Problem resolved by replacing router.

更新资料 3 (30-五月-2011)

I’ve tested the laptop connected to 2 more wireless-n networks. 它的工作原理没有任何问题. In conclusion there is either a fault with the draytek or there is an incompatibility. Having already sent the draytek back once before I am rather disappointed that draytek failed to resolve the issue.

If you’re thinking of getting a Draytek, consider an alternative. I can recommend the Netgear DGND3700

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