Cisco Systems uBR7246VXR Network Router User Manual


 
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The amplitude and shape of the downstream IF carrier does not change after the router is configured, regardless of
modulation scheme used whether 64 or 256-QAM.
Tip By default, Cisco uBR-MC16U or Cisco uBR-MC28U cable interface line cards have no output until the DS freq is set
and the command no cab down rf-shut is applied.