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Dual QAM/8VSB Monitoring Blade


The VB262 DUAL QAM/8VSB input option offers monitoring of QAM signals as found in QAM cable networks and off-air 8VSB signals. The chassis can be equipped with a single VB120 or VB220 master card that has one or two VB262 input cards under its control.


  • Dual input QAM/8VSB receiver (one input standard, the second is optional)
  • Fully independent inputs
  • Fully compliant with ETS 300 249
  • ITU.T J.83 (Annex A/B/C)
  • QAM modes: 16,32,64,128,256
  • VSB modes: 8VSB
  • Constellation Diagram
  • Wide symbol rate range of 0.87 to 7.0 Mbaud
  • Selectable IF filter (6/8 MHz)
  • Excellent neighbor channel isolation
  • Dual 75 ohm F-connector input
  • SNR
  • Pre-FEC BER
  • Post-FEC BER
  • MER
  • Input signal level
  • Frequency offset
  • Symbol rate offset
  • Spectrum inversion
  • AGC Lock/Carrier lock indication
  • Inputs support round-robin operation
  • Fully controlled via backplane by VB120 or VB220

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