Your contact partner for this product is: Michael Hirschmueller ǀ +49 9078 9695-95 ǀ

Redundancy switching unit


The switching system is used in the ASTRA ground control station and consists of 3 switching groups with 6 inputs, 6 outputs and 2 backup outputs which are housed in the two units GTS0731 (group 1+2) and GTS0732 (group 3). Every input, consisting of 3 signals (2x telemetry data, 1x command data), can be switched either to the belonging output or to one of the two backup outputs with blocking.


The switching unit is housed in two 19“ subrack with very good RF shielding and consists of the following sub-assemblies:

-    relay switches SPDT
-    relay switches SP4T
-    I/O boards
-    processor board
-    RS-232 interface
-    voltage monitoring board
-    manual control panel
-    redundant power supply units

All the necessary signal, power supply and earthing connections are provided at the rear.
The mains switch is located on the front panel.


The unit is controlled via a RS-232 interface and via a manual control panel with pushbuttons which is integrated on the front panel.

Special features

The system is equipped with redundant power supply units in order to improve operational safety.
The power supply voltages and the I/O boards are monitored in a processor routine.
A status string can also be requested at any time via the control interface.
The unit is constructed using a modular approach utilising 19” plug-in sub-assemblies which enable ease of installation and maintenance.

Technical datameasured at 25 °C
Configuration:3 switching groups with
6 inputs, 6 outputs and
2 backup outputs
Switching specifications
Impedance:50 Ohm
Frequency range:DC … 100 MHz min.
Insertion loss:0.8 dB max.
Return loss:18 dB min.
Crosstalk:70 dB min.
Input power:1 Watt
Switching elements:latching relays
Switching time:20 ms max.
Switching cycles:1 million min.
Further specifications
Manual control:pushbuttons
RF connectors:BNC female, 50 Ohm
Power supply:195 … 264 VAC, 47 … 63 Hz, redundant
Connector3-pin, with mains filter and fuses
Mains switch:with integrated lamp
Temperature range:
Operating0 … 50 °C
EMC:in accordance with European standard EN 55022 and EN 50082-1/2
6 RU
3 RU
Depthabout 360 mm (without connectors)
Front panel:painted light grey (RAL 7032)