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

Redundancy switching unit


The switching unit is used in the ASTRA ground control station for the switching of a backup signal string to ASTRA 1C/1D or ASTRA 1E/1F.


The switching unit is housed in a 6 U 19“ subrack with very good RF shielding and consists of the following sub-assemblies:

-    relay switches SPDT
-    I/O boards
-    processor board
-    RS-232 interface
-    voltage monitoring board
-    redundant power supply unit

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 pushbutton which is integrated on the front panel.

Special features

The unit 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:10 coaxial switches, SPDT
6 RS-232 switches, 4x SPDT
2 monitor & control switches, 19x SPDT
1 monitor & control switch, 10x SPDT
Switching specifications
Coaxial switches:
Impedance50 Ohm
Frequency rangeDC … 100 MHz
Insertion loss0.1 dB max.
Return loss22 dB min.
Crosstalk95 dB min.
Switching elementslatching relays
Switching time20 ms max.
Switching cycles1 million min.
Data switches:
Switching elementslatching relays
Switching time20 ms max.
Switching cycles1 million min.
Further specifications
Manual control (optional):pushbuttons
Signal connectors:
Coaxial switchesBNC female, 50 Ohm
Data switchesInputs: D-Sub male, 25-pin
Outputs: D-Sub female, 25-pin
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
Height6 RU
Depthabout 360 mm (without connectors)
Front panel:painted light grey (RAL 7032)