十几天前申请了一个很心仪的工作,之前发了一封信给manager,没有回应,上周开会 碰到了这个mangager,但是没怎么说上话,所以周一发了一封信询问申请的进展,结果 周三被退回,原因如下: The following message to was undeliverable. The reason for the problem: 5.4.7 - Delivery expired (message too old) 'timeout' 我以为是带的附件太大,所以把附件去除了又发了一次,结果今天(周五)又是同样的 理由退回了。请问各位这是怎么一回事呢?难道那个manager把我来信屏蔽了?还是这 个信息是个病毒,但是对方已经收到我的信了呢?心里很着急,机会特别难得。谢谢大 家的帮忙!
【在 b******2 的大作中提到】 : 十几天前申请了一个很心仪的工作,之前发了一封信给manager,没有回应,上周开会 : 碰到了这个mangager,但是没怎么说上话,所以周一发了一封信询问申请的进展,结果 : 周三被退回,原因如下: : The following message to was undeliverable. : The reason for the problem: : 5.4.7 - Delivery expired (message too old) 'timeout' : 我以为是带的附件太大,所以把附件去除了又发了一次,结果今天(周五)又是同样的 : 理由退回了。请问各位这是怎么一回事呢?难道那个manager把我来信屏蔽了?还是这 : 个信息是个病毒,但是对方已经收到我的信了呢?心里很着急,机会特别难得。谢谢大 : 家的帮忙!
Broadcom's chipset uses three techniques to boost speed within the 802.11g s tandard: frame bursting, fast frames, and compression. Frame-bursting client s send multiple data packets during each time period they're allowed on the air. This reduces packet overhead and levels the playing field for "g" clien ts in a mixed "b/g" network, since "g" clients can send three packets of dat a in the same amount of time it takes for a "b" client to send one. Frame bu rsting is probably the technology most
【在 z*****n 的大作中提到】 : Broadcom's chipset uses three techniques to boost speed within the 802.11g s : tandard: frame bursting, fast frames, and compression. Frame-bursting client : s send multiple data packets during each time period they're allowed on the : air. This reduces packet overhead and levels the playing field for "g" clien : ts in a mixed "b/g" network, since "g" clients can send three packets of dat : a in the same amount of time it takes for a "b" client to send one. Frame bu : rsting is probably the technology most
u*w
11 楼
先去找个店打工,做到了有回头客以后再考虑开店。
z*n
12 楼
yes, it increases throughput quite a lot, because a big portion of time in 802.11 MAC protocol is wasted on catching the channel (random-backoff).
【在 w******t 的大作中提到】 : frame burst真的有这么管用?这个frame burst是不是就是对一个超长的packet进行 : fragment然后每两个burst frame之间不用LIFS,只用SIFS?所以只要一个frame竞争上 : 信道之后,其后所有的frame都可以传输了 : : s : client : the : clien : dat : bu
【在 z*****n 的大作中提到】 : yes, it increases throughput quite a lot, because : a big portion of time in 802.11 MAC protocol is : wasted on catching the channel (random-backoff).
z*n
14 楼
嗯,不记得作者和文章了。不过我们可以从802.11 throughput分析的文章里面间接得到答案。 只要看看average interframe timeslot number vs. node number 就可以得出大概的结论。理想情况下,frame burst 模式可以eliminate这些waste。
【在 z*****n 的大作中提到】 : Broadcom's chipset uses three techniques to boost speed within the 802.11g s : tandard: frame bursting, fast frames, and compression. Frame-bursting client : s send multiple data packets during each time period they're allowed on the : air. This reduces packet overhead and levels the playing field for "g" clien : ts in a mixed "b/g" network, since "g" clients can send three packets of dat : a in the same amount of time it takes for a "b" client to send one. Frame bu : rsting is probably the technology most
z*n
18 楼
Basically, yes. The router/AP has to be enabled with this technology. The clients can be normal ones.
【在 a***o 的大作中提到】 : 这样是得router也要同样的技术吧? : : s : client : the : clien : dat : bu : improveme : the