TRENDnet TEW-740APBO Users Guide - Page 41

TRENDnet User's Guide Queue Data Transmitted Clients to AP Priority Description AC_BK Background. High throughput. Bulk data that requires maximum Low throughput and is not time- sensitive is sent to this queue (FTP data, for example). AC_BE Best Effort Medium Medium throughput and delay. Most traditional IP data is sent to this queue AC_VI Video Minimum delay. Time-sensitive High video data is automatically sent to this queue AC_VO Voice Time-sensitive data like VoIP High and streaming media are automatically sent to this queue parameters for traditional IP data. As an Example, time-sensitive Voice & Video, and multimedia are given effectively higher priority for transmission (lower wait times for channel access), while other applications and traditional IP data which are less time-sensitive but often more dataintensive are expected to tolerate longer wait times. o Aifsn: The Arbitration Inter-Frame Spacing Number specifies a wait time (in milliseconds) for data frames o CWmin: Minimum Contention Window. This parameter is input to the algorithm that determines the initial random back-off wait time ("window") for retry of a transmission. The value specified here in the Minimum Contention Window is the upper limit (in milliseconds) of a range from which the initial random back-off wait time is determined. o CWmax: Maximum Contention Window. The value specified here in the Maximum Contention Window is the upper limit (in milliseconds) for the doubling of the random back-off value. This doubling continues until either the data frame is sent or the Maximum Contention Window size is reached. Once the Maximum Contention Window size is reached, retries will continue until a maximum number of retries allowed is reached. Valid values for the "cwmax" are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The value for "cwmax" must be higher than the © Copyright 2016 TRENDnet. All Rights Reserved. TEW-740APBO value for "cwmin". o Txop: Transmission Opportunity is an interval of time when a WME AP has the right to initiate transmissions onto the wireless medium (WM). This value specifies (in milliseconds) the Transmission Opportunity (TXOP) for AP; that is, the interval of time when the WMM AP has the right to initiate transmissions on the wireless network. o ACM: Admission Control Mandatory, ACM only takes effect on AC_VI and AC_VO. When you do not click Checkbox, it means that the ACM is controlled by the connecting AP. If you click Checkbox, it means that the Client is in charge. o AckPolicy: Acknowledgment Policy, WMM defines two ACK policies: Normal ACK and No ACK. Click "Checkbox" indicates "No ACK" When the no acknowledgment (No ACK) policy is used, the recipient does not acknowledge received packets during wireless packet exchange. This policy is suitable in the environment where communication quality is fine and interference is weak. While the No ACK policy helps improve transmission efficiency, it can cause increased packet loss when communication quality deteriorates. This is because when this policy is used, a sender does not retransmit packets that have not been received by the recipient. When the Normal ACK policy is used, the recipient acknowledges each received unicast packet.  WMM Parameters of Station: This affects traffic flowing from the client station to the access point. o Aifsn : The Arbitration Inter-Frame Spacing Number specifies a wait time (in milliseconds) for data frames o CWmin : Minimum Contention Window. This parameter is input to the algorithm that determines the initial random backoff wait time ("window") for retry of a transmission. The value specified here in the Minimum Contention Window is the upper limit (in milliseconds) of a range from which the initial random backoff wait time is determined. o CWmax : Maximum Contention Window. The value specified here in the Maximum Contention Window is the upper limit (in milliseconds) for the doubling of the random backoff value. This doubling continues until either the data frame is sent or the Maximum Contention Window size is reached. Once the Maximum Contention Window size is reached, retries will continue until a maximum number of retries allowed is reached. Valid values for the "cwmax" are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The value for "cwmax" must be higher than the value for "cwmin". o Txop : Transmission Opportunity is an interval of time when a WME AP has the 41