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VB252: DVB-T/T2 TERRESTRIAL RF INPUT MODULE

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.


Figure - The 1RU Enhanced Chassis populated with one VB120 module controlling two VB252 DVB-T/T2 input modules
giving a total of 4 independent RF inputs
.

In addition to monitoring typical RF parameters, the monitoring solution optionally allows advanced analysis of the complex DVB-T MI protocol; signal integrity is verified layer by layer. The VB252 also support the T2 Lite standard with full analysis of T2 Lite transmissions. All this analysis functionality is complemented by the renowned Bridge Technologies ETSI TR 101 290 monitoring engine to ensure standards conformance at all levels.

Figure - The Channel Impulse Response echo view useful for off-air monitoring and alarming in SFN fringe areas In a typical DVB-T/T2 system transmitter sites are fed via IP infrastructure or via satellite distribution. The Bridge Technologies range of interfaces and interface modules make it easy to monitor the complete signal chain end-to-end.

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 VB270 satellite interface module, which is valuable if combined IP and satellite distribution to transmitter sites is used.


Similarly the VB252 can be used with a VB242 ASI input module, enabling high density ASI and DVB-T/T2 monitoring.

The basic VB252 supports one COFDM RF input. The second input of the VB252 can be enabled by the customer via a software licencing option. This flexibility allows probe capacity to be tailored to individual system needs, and increase as a monitoring system is expanded to include more transport streams.

The Advanced RF Option adds impulse response graphing and analysis to the VB252, making it possible to check reflection conditions at the probe location. Configurable threshold limits determine when an alarm should be raised due to reflection changes in time or power.

Impulse response analysis results are presented as a user-friendly graphical GUI, facilitating reflection measurement interpretation. Licence upgrades are performed by entering a licence key in the regular probe GUI and they can therefore be done remotely.

News TECHNICAL FEATURES
Choice between 50 ohm female SMA (VB252-SMA) or 75 ohm female F-type connectors (VB252)
50 ohm female SMA 1-pulse-per-second GPS input for SFN Drift measurements
9-pin D-Type male connector for relay alarm indication
One red/green LED TS sync indicator per RF input
Supports DVB-T EN 300-744 and DVB-T2 EN-302-755
Frequency range 43 - 1002 MHz
Symbol rate range 0.7 - 7.2 Msym/s
All versions of DVB-T2 supported: 1.1.1, 1.2.1 and 1.3.1
DVB-T2 Base and DVB-T2 Lite profiles supported (1.3.1)
Channel bandwidth: 1.7 (T2-Lite only), 5, 6, 7 and 8 MHz
Round-robin capability across multiple PLPs within one frequency
Capable of monitoring the following RF parameters:
- Channel power RF level
- Modulation Error Rate MER(PLP)
- Signal to Noise Ratio SNR
- Center Frequency Offset
- Spectrum sense
- 1PPS Input Lock
- Pre Viterbi BER (DVB-T)
- Pre Reed Solomon BER (DVB-T)
- Pre LDPC BER (DVB-T2)
- Pre BCH BER (DVB-T2)
- Post BCH FER (DVB-T2)
- Packet Error Rate
- LDPC Iterations count
DVB-T SFN Drift monitoring for measuring absolute transmission time of mega frame
DVB-T2 SFN Drift monitoring by measuring timing of T2MI frame versus received RF super frame
Readout of TPS information (DVB-T)
Readout of signalled L1 and PLP parameters (DVB-T2)
Channel impulse Response diagram
Constellation diagram
SFN Drift monitoring for DVB-T
SFN Drift monitoring for DVB-T2
Extract and display over 30 signalled DVB-T2 L1 Pre information parameters
Extract and display over 20 signalled DVB-T2 L1 PLP information parameters
Extract and display 9 signalled DVB-T2 L1 Post information parameters
News ADDITIONAL RF INPUT OPTION
Enabling the second VB252 RF input
Remote licence upgradeable
News ADVANCED RF OPTION
Constellation diagram
Channel Impulse response diagram with advanced alarming capabilities
Configurable alarm template to verify position of CIR echoes in both time and relative amplitude
Supports alarming on up to 10 CIR echoes
News RF SPECIFICATIONS
  RF power level: -80 dBm to -20 dBm
RF power level accuracy: +/- 1.5 dB
  RF power level resolution: 1 dB
Maximum SNR: > 38dB +/- 1.5dB
Maximum MER: > 38dB +/- 1.5dB
Carrier offset: < 15 ppm of tuning frequency
SFN drift: 0 to 500ms
SFN drift accuracy: +/- 2us
News PRODUCT ORDERING CODES
VB252 DVB-T/T2 COFDM Demodulator interface blade single RF input - 75Ohm F-Connectors
VB252-SMA DVB-T/T2 COFDM Demodulator interface blade single RF input - 50Ohm SMA Connectors
VB252RF-OPT Additional RF input option for VB252/VB252-SMA card for a total of 2
VB252RF-UPGR Advanced RF Option for VB252/VB252-SMA with Impulse Response graphing and alarming
VB252-ARF-OPT Advanced RF Option for VB252/VB252-SMA with Impulse Response graphing and alarming, factory ordered
VB252-ARF-UPGR Advanced RF Option for VB252/VB252-SMA, upgrade license

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