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Chapter 2 - Managing a Single Device/Cell Performance Parameters Page
AlvariCRAFT Device Manager 148 User Manual
Burst Mode parameters are is not applicable when the Wireless Link Prioritization
Option is enabled.
2.23.8 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 all BreezeACCESS units with HW revision A or B and BreezeNET
B-14/28 units, or 4032 bytes for BreezeACCESS units with HW revision C or
higher and BreezeNET B B-100 units. In an AU, the concatenation process is
performed separately for each destination SU.
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 support concatenated frames with a higher size. 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 unit can support the feature (uses SW version 3.0 or higher).
Burst Mode Option The Burst Mode Option enables or disables the Burst Mode operation
Burst Interval (msec) The Interval defines the burst size, which is the time in which data
frames are sent immediately without contending for the wireless
medium.
The range is 1 to the value of the Maximum Burst Duration defined for
the Sub-Band.