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Chapter 4 - Operation and Administration
BreezeACCESS VL System Manual
190
4.2.6.5.8.3 Packet Thershold to Test Up Rate
When the number of frames transmitted on the current modulation reaches this
number, the Adaptive Modulation algorithm will test the upper modulation.
The available range is between 10 and 10000.
The default value is 100.
4.2.6.5.8.4 Packet No On Upper Rate
This option indicates the number of frames used by the Adaptive Modulation
algorithm to test upper modulations.
The available range is between 1 and 3.
The default value is 1.
4.2.6.5.9 Concatenation Parameters
The Concatenation mechanism enables bundling several data frames into a single
frame for transmission to the wireless link. This feature improves throughput and
reduces the overhead in the wireless medium, by requiring only one CRC for each
concatenated frame, one RTS/CTS cycle if applicable, and a single waiting period
according to the contention window mechanism before transmission. When
concatenation is enabled, data packets in the queue of the internal bridge can be
accumulated before the concatenated frame is transmitted to the wireless
medium. Data frames can be accumulated up to a maximum frame size of 2200
bytes for units with HW revision A or B, or 4032 bytes for units with HW revision
C or higher. In the AU, the concatenation process is performed separately for
each destination SU.
NOTE
Using the Link Capability exchange mechanism, each unit learns the HW Revision and the SW
Version of the unit(s) associated with it. A concatenated frame with a length exceeding 2200 bytes
may be generated and transmitted only if both the source and destination units have HW Revision
C or higher. If either the source or destination unit uses SW Version 3.0 or 3.1, then the maximum
size of the concatenated frame is 3400 bytes, and the maximum number of data frames that can be
bundled into a concatenated frame is 2 for units with SW version 3.0 and 8 for units with SW
version 3.1.
A frame is a candidate for bundling into a concatenated frame if all the following
conditions are met:
The frame is a data frame
The destination is an entity behind the destination AU/SU.
The destination AU/SU can support the feature (uses SW version 3.0 or
higher).