Chapter 6: Services Menu
Table 23. Modify QoS Queue Parameters Window (Continued)
Column | Description |
|
|
|
|
| Data 2 (best effort): Medium priority |
| queue, with minimum throughput and |
| delay. The queue is used to store most |
| traditional IP data. |
| Data 3 (Background): Lowest priority |
| queue, with high throughput. This queue |
| is used for bulk data that requires |
| maximum throughput and is not time- |
| sensitive, such as FTP packets. |
|
|
AIFS (InterFrame Space) | Specifies the Arbitration |
| Spacing (AIFS) value, which controls the |
| wait time for data frames. The wait time is |
| measured in slots. The range is 1 to 15 |
| slots. |
|
|
cwMin (Minimum | Specifies a value that an algorithm uses to |
Contention Window) | determine the initial random backoff wait |
| time (window) for resending packets. |
| This value is the upper limit (in |
| milliseconds) of a range from which the |
| access point determines the initial random |
| backoff wait time. |
| The first random number the access point |
| generates will be between 0 and this |
| number. |
| If the first random backoff wait time |
| expires before the data frame is sent, a |
| retry counter is increased and the random |
| backoff value (window) is doubled. |
| Doubling continues until the size of the |
| random backoff value reaches the |
| number defined in the maximum |
| contention window. |
| Valid values for this parameter are: 1, 3, 7, |
| 15, 31, 63, 127, 255, 511, and 1023. This |
| parameter must be lower than the cwMax |
| value. |
|
|
132
