Figure 4.10: Block diagram
A VB220 (Controller card) must be in the leftmost slot in the chassis, the VB272-SMA must be placed in
the middle slot and the 273 blade in the slot to the right. The RF out 1 and RF out 2 should be connected
to their corresponding connector on the VB272 blade.
The VB273 is built with high reliability and redundancy in mind. The switching operation is performed
by robust bistable relays. This means that if the power should disappear from the chassis or even if the
VB273 module is pulled out of the chassis the signal path remains in its latched position.
The module is remote controllable via the GUI and in addition there is a button interface consisting of 3
push buttons for manual override, this is further explained in chapter 6.16.
LED indicators clearly show the current path of the IF signal as well as the operating mode of the module.
The connectors are:
VB2xx GigE User’s Manual version 5.4 29
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