User Manual

DXU-21
External Sync. (Freq. Ref.)
This interface is used for connecting an external frequency reference. It uses a
generic synchronization port for the synchronization information.
Optional Output
This interface enables control of up to eight devices, which can be of various
types. These outputs are accessed through the upper backplane connector.
Optional Input
This interface enables connection of up to eight internal cabinet signals, such
as alarms. These inputs are accessed through the upper backplane connector.
IOM Bus
This interface consists of three individual I2C ports. It is used to communicate
with the CDU, CXU, TMA-CM and cabinet ID.
An I2C bus is reserved for reading a memory device which identifies the source
for the system.
The interface is accessed through the lower backplane connector.
Y Links
This interface is used for communication with the dTRUs and sTRUs. The Y
interface consists of 12 separate Y links.
The Y links are accessed through connectors located on the front of the DXU.
EPC Bus (Optical Cable)
This interface is used for communication with the power supply equipment
in the RBS, such as PSUs and BFU.
The optical communication interface is accessible through connectors located
on the front of the DXU. The connectors are marked ‘‘EPC’’.
Note: Not used in ECU-equipped cabinets.
GPS
This interface is used for interfacing an external sync./frequency source, such
as GPS. It is accessed through a connector of type 8-pin RJ-45, located on the
front of the DXU. The connector is marked ‘‘GPS’’.
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N/LZT 720 0244 Uen R3A