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4.4
Power Supply
The power supply delivers all the voltages necessary for the DXU-21. The
input voltage, +24 V DC, is supplied through backplane connectors.
4.5
Timing System
The timing system is used for generating a 13 MHz clock signal.
4.6
Miscellaneous Logic
This function contains the following:
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•
•
4.7
Compact Flash Card
The removable Compact Flash Card permits quick and easy change of the
SW and IDB in the DXU.
5
Interfaces
5.1
Signal and Power Interfaces
G.703 Interface
The four G.703 interfaces are connected to the BSC (Protocol GSM-Abis) or
to cascaded base stations. In cascade mode, this interface can control an
external bypass relay. Unused time slots can be through-connected to a
successive base station. The communication speed in E1 interfaces is
2 Mbit/s and in T1, 1.5 Mbit/s.
External Alarm Inputs
Through this interface it is possible to connect up to 15 binary alarms (16
including one dedicated alarm). This interface is found on the upper backplane
connector.
EN/LZT 720 0244 R1A
System voltage measurement
Temperature measurement
Power on reset
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