Click image to view larger

DVB-T/T2 Dual Monitoring Blade

VB252

VB252 is a dual input DVB-T/T2 input interface module that enables monitoring of digital terrestrial transmissions. Two modules may be housed in a 1RU chassis together with a controlling VB120 or VB220 probe, providing high monitoring capacity occupying a minimum of rack space.

In addition to monitoring typical RF parameters, the monitoring solution optionally allows advanced analysis of the complex T2-MI protocol; signal integrity is verified layer by layer. This analysis functionality is complemented by the renowned VideoBRIDGE ETSI TR 101 290 monitoring engine to ensure standards conformance at all levels.

DVB-T2 allows signal distribution to transmitter sites via IP in addition to synchronous distribution methods like satellite. The VB120/VB252 combination enables monitoring of up to 50 IP multicasts, thus monitoring IP network distribution together with DVB-T2 transmissions. It is even possible to equip the monitoring chassis with a VB272 satellite interface module, which is valuable if combined IP and satellite distribution to transmitter sites is used.

  • Standards: DVB-T (EN 300-744), DVB-T2 (EN-302-755)
  • Fully compliant with DVB-T2 v1.3.1 including T2-lite and L1 post scrambling
  • Dual input digital terrestrial receiver one input is standard, second input is enabled with optional license
  • Fully independent inputs
  • All bands DVB-T/T2 receiver (47 - 1000 MHz)
  • Symbol rate range: 0.7 to 7.2 Msym/s
  • Full support for MFN and SFN systems
  • Channel bandwidth: 6, 7 or 8 MHz
  • RF inputs: 75 ohms F-connector
  • 1PPS input: 50 ohms SMA connector, female
  • Measured RF parameters: packet error rate, signal level, SNR, pre LDPC BER, pre and post BCH BER, MER
  • SFN drift monitoring using 1PPS input signal
  • Constellation diagram
  • Impulse response diagram with optional license
  • Configurable round-robin testing
  • Fully controlled via backplane by VB120 or VB220
  • LEDs indicating RF signal lock
  • Built-in general purpose alarm relay (GPI)

MONITORING SPECIFICATIONS
Minimum input signal level: -80 dBm
Maximum input signal level: -20 dBm
Level accuracy: +/- 1.5 dB
Maximum MER: >38 dB
MER accuracy: <1.5 dB
Carrier offset: <15 ppm of frequency

RF INPUT
F-connector, female

ALARM RELAY
9-pin D-SUB, male
3-pin relay contacts

MECHANICAL
Standard 19˝ 1RU rack-mount
W x H x D: 19 x 1.7 x 15.75in. (483x43x400 mm)
Weight: 9.3 lbs (4.2 kg) fully populated

ENVIRONMENT SPECIFICATIONS
Operating temperature: 0ºC to 45ºC
Storage temperature: -20ºC to 70ºC
Operating humidity: 5% to 95% non-condensing

CONTROL AND MANAGEMENT
Fully controlled through backplane
Accessible through master VB120 or VB220 user interface

POWER SUPPLY REQUIREMENTS
Draws power from backplane (+5V)
Maximum 5W dissipated per card