IF in 1:
75 ohm female BNC for 70 MHz IF signals as found in satellite uplink scenarios. First
input terminal. The input signal level should lie in the range -15 dBm to 0 dBm in order to
guarantee a correct level on the up-converted RF out 1 terminal
IF in 2:
75 ohm female BNC for 70 MHz IF signals as found in satellite uplink scenarios. Second
input terminal. The input signal level should lie in the range -15 dBm to 0 dBm in order to
guarantee a correct level on the up-converted RF out 2 terminal
IF out:
75 ohm female BNC carrying either the
IF-1
signal or the
IF-2
signal depending on
redundancy switch state. The insertion loss through the relay is just below 1 dB.
RF out 1:
50 ohm SMA female RF L-band output version of the
IF-1
input signal centered at 1024
MHz + IF input signal frequency e.g.: 1094 MHz for 70 MHz IF input signal.
RF out 2:
50 ohm SMA RF L-band output version of the
IF-2
input signal centered at 1024 MHz +
IF input signal frequency e.g.: 1094 MHz for a 70 MHz IF input signal.
The button interface is described in the table below
Push button Description
Input A / Primary
Pushing this button ensures IF-1 is switched to the output as well as changing
the operating mode to ‘SuperLocal’. The button lights up to indicate the signal
path.
Input B / Secondary
Pushing this button ensures IF-2 is switched to the output as well as changing
the operating mode to ‘SuperLocal’. The button lights up to indicate the signal
path.
Auto
Pushing this button toggles the operating mode of the module between ‘Auto’
(push button and it becomes lit) and ‘Manual’ (hold button until no light). Button
light slowly flashing indicates operating mode ‘SuperLocal’.
The VB273 operates in 3 distinct modes. These are:
•
AUTO: The switching between A and B is done automatically based on the switching criteria
defined in the probe GUI, see chapter 6.16.
•
MANUAL: The switching between A and B is done manually from the GUI or from third party NMS
systems using the Eii interface.
•
SuperLocal: The switching between A and B can only be performed from the front panel or the
probe GUI. No further switching is possible from third party NMS systems until the operating
mode is changed to MANUAL or AUTO. This last mode guarantees no interference from overlying
software control systems and is meant as an override mode in test and fault finding scenarios.
The operating mode can be directly seen via the light of the AUTO button:
• Off: Manual mode
30 VB2xx GigE User’s Manual version 5.4
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