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VB252 – DVB-T/T2 COFDM digital terrestrial Interface

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 DVB-T MI protocol; signal integrity is verified layer by layer. This analysis functionality is complemented by the renowned Bridge Technologies ETSI TR 101 290 monitoring engine to ensure standards conformance at all levels.

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
Standards: DVB-T (EN 300-744), DBV-T2 (EN-302-755)
Dual input digital terrestrial receiver
Fully independent inputs
All bands DVB-T/T2 receiver (47 - 1000 Mhz)
Symbol rate range: 0,7 to 7,2 Msym/s
Channel bandwidth: 6, 7 or 8 MHz
RF inputs: 75 ohms F-connector
IPPS input: 50 ohms SMB connector, female
Measured RF parameters: packet error rate, sIgnal level, SNR, pre and post BCH BER, MER
SFN drift monitoring using IPPS input signal
Configurable round-robin testing
Fully controlled via backplane by VB120 or VB220
LEDs indication signal lock
Built-in general purpose alarm relay (GPI)
News ADDITIONAL RF INPUT OPTION
Enabling the second VB252 RF input
Remote licence upgradeable
News ADVANCETD RF OPTION
Impulse response diagram
Reflection power measurements
Configurable reflection time and power alarming limits
10 reflections supported
Remote licence upgreadable
Remote licence upgreadable
News MONITORING SPECIFICATIONS
Minimum input signal -80 dBm
Maximum input signal -10 dBm
Level accuracy +/- 1.5dB (average)
Maximum MER >38 dB
MER accuracy <1.5dB (average)
Carrier offset < 15 ppm of frequency
News PRODUCT ORDERING CODES
VB252 VB-T/T2 Demodulator interface blade single RF input
VB252-SMA  
VB252RF Additional RF input option for VB252 card for a total of 2
VB252RF-OPT Advanced RF Option for VB252 with Impulse Response graphing and alarming
VB252-ARF-OPT Advanced RF Option for VB252 with Impulse Response graphing and alarming, factory ordered
VB252-ARF-UPGR Advanced RF Option for VB252, upgrade license


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