Chapter 4 - Operation and Administration

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.

4.2.6.5.9Concatenation 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).

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Alvarion SW VERSION 5.1 system manual Packet Thershold to Test Up Rate, Packet No On Upper Rate, Concatenation Parameters