Reference Manual

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EN/LZT 720 0244 R1A
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:
• System voltage measurement
• Temperature measurement
• Power on reset
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.