Trango Systems, Inc. GigaPlus User Manual Rev 3.1 30
For HP ODU models the TR spacing can be customized via a software command as long
as the new TR spacing and channel bandwidths are within the diplexer range.
See Appendix A for more information
Channel Sizes from 3.5 MHz to 80 MHz
Across all the frequency bands, the system can support channel sizes as low as 3.5 MHz.
The table below shows the various channels supported and the Ethernet capacities for
each in non-ACM mode. ACM capacities will be slightly less due to the ACM overhead.
Adaptive Coding and Modulation
Adaptive coding and modulation provides error-free hitless changing of the modulation
level for a fixed channel width to allow the link to be maintained during heavy weather
related fading conditions. Instead of the link dropping and no traffic passing, the link
will be maintained with a lower capacity until the fading condition is removed, at which
time the link will return to the normal modulation level.
The transitions between modulation levels are controlled by thresholds which are user-
modifiable and each transition is made without dropping packets since both ends of the
link coordinate the transition automatically.
The Figure below shows the Adaptive Coding and modulation in action.
Figure 9 Adaptive Coding and Modulation (ACM)
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