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QMultiFlex-400™ Installation and Operating Handbook
Figure 8-19 – Effect of Non-Linearity on Canceller Suppression
5. There appears to be two challenges in realising a working system:
a. Countering the self-interference of the remote modems to their own IB carriers.
In the test cases, the effect of the self-interference amounted to an equivalent
2dB increase approximately in No.
b.
Ensuring that the hub uplink-downlink signal loop is designed to run linearly to
ensure the suppression performance of the hub canceller is not significantly
compromised.
8.3.6 Troubleshooting Guide
8.3.6.1 Why Can I Not Enable the Hub Canceller?
For the Hub canceller to be enabled, you need the hardware to host it. To verify you have
the hardware, navigate to
Figure 8-20 - QMultiFlex-400™ Hub Modem Unit information
`View > Unit`
menu screen, as follows:
8-19
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