A dual input DVB-T/T2 input interface module that enables monitoring of digital terrestrial transmissions.
- 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
- DVB-T SFN Drift monitoring for measuring absolute transmission time of mega frame
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. 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.
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.