The VB253 provides full dual path redundancy with autonomous operation and deep signal analysis on both signal paths for unprecedented switching decision making.

Local autonomous operation, remote control by NMS or triggers or both in addition to a SuperLocal mode for complete local override provides for any requirements during operational challenges.

The VB253 has multiple layers of redundancy, from the EC dual power AC chassis to magnetically latched broadcast grade signal relays. All to protect against any contingency, even a complete power loss and also to provide component upgrade or swaps without signal interruption. The VB253 card provides 2 inputs of post modulator signals and one output for the transmit stage.

The switch also provides a tap to feed the VB252-SMA card with signals from the two different production chains for real-time analysis of both signals. If any problem in any parameter is detected, pre-set rules apply and the unit will check the opposite input for the same failure and switch if no failure is detected. To avoid switch flapping, rules for a minimum time to switch back or manual switchback can also be set. All the parameters in the comprehensive ETR290 engine can be utilised for switch triggering, including detailed CA system validation checks and all pri 1-2-3 parameters.

The VB253 system can in normal operations be totally independent and make its own switching decisions, but can also be controlled from any NMS system with extensive Eii (External Integration Interface) parameters or SNMP triggers.

The VB253 also features a unique SuperLocal feature to avoid NMS control when situations where uncertainty on control parameters occur, and then illuminated front panel controls can be used to force the unit to switch or to stay latched. All parameters can be controlled via the built-in web GUI. The web GUI also gives a visual overview of parameters used in switch decisions and system status.

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