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ISDB-T(b) Dual Monitoring Blade


The VB256 ISDB-T(b) RF input blade brings support for the latest ISDB terrestrial modulation standards to the VideoBRIDGE product line. With support for all modern ISDB-T system modes, the VB256 includes all the modulation formats needed to monitor modern ISDB-T broadcast systems. Each VB256 includes two independent tuners. One is enabled by default and the other is enabled with the VB256RF-LICENSE. Together with the VB120 or VB220 controllers, this allows up to 4 RF inputs in a 1RU chassis. 

A complete configuration with a fully licensed VB120 provides real-time monitoring and alarming for 4 ISDB-T(b) inputs, 50 IP MPTS/SPTS multicasts, and an ASI TS input and output. ETSI TR 101 290 analysis and monitoring is performed in parallel for the RF inputs, the ASI input and the IP input. If a VB220 is used as the controller, the IP monitoring capacity is increased to 260 MPTS/ SPTS multicasts in addition to the RF inputs.

The combined unit is ideal for networks where IP is used as a carrier from head-end to the transmitter. The built-in round- robin functionality allows sequential analysis of multiple ISDB-T channels, making it possible to monitor all the transmissions available on an antenna using a single VB256. One VB256 module is capable of demodulating two multiplexes (one per input) for ETSI TR 101 290 fault detection and alarm generation in the full frequency band (42-1002 MHz).

2 x independent RF inputs capable of parallel operation

75Ω female F-type connectors

Nine-pin D-Type male connector for relay alarm indication

1 x red/green LED TS sync indicator per RF input

42~1,002 MHz frequency range

Round-robin capability across multiple PLPs within one frequency

Fully controlled via backplane by VB120 or VB220

Supports a full suite of ISDB-T(b) measurements:

  • Channel Power RF Level
  • Modulation Error Rate MER(PLP) PreRS BER-A
  • Signal to Noise Ratio SNR
  • PreRS BER-B
  • PreRS BER-C
  • PER-A
  • PER-B
  • PER-C 


    Frequency Range
    42~1,002 MHz 

    Symbol Rate
    0.87~7.0 Msym/s 

    RF Power Level
    -70dBm to -10dBm

    Return Loss

    ISDB-T system 

    • ISDB-T (ISDB for Terrestrial Television Broadcasting) 
    • ISDB-TSB (ISDB for Terrestrial Sound Broadcasting) 

    ISDB-T system modes 

    1. 1,405 carriers 
    2. 2,809 carriers 
    3. 5,617 carriers 

    Code Rate
    1/2, 2/3, 3/4, 5/6, 7/8 

    DQPSK, QPSK, 16QAM, 64QAM 

    Guard Interval
    1/32, 1/16, 1/8, 1/4 

    Dual 75Ω F-connector, female 


    Rack Mount
    Standard 19 inch 1RU 

    W x H x D
    19 x 1.7 x 15.75 inches (483 x 43 x 400 mm) 

    9.3 pounds (4.2 kg) fully populated 


    Operating Temperature

    Storage Temperature

    Operating Humidity
    5~95% non-condensing 

    Fully controlled through backplane
    Accessible through master VB120 or VB220 user interface 


    Backplane Voltage

    AC Power Required

    Power drawn from backplane

    Maximum dissipation per card