Ericsson RBS 2106 Hardware Reference Manual page 342

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An I C 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".
External Sync. (GPS/LMU)
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".
GPS/LMU
This interface is identical to the serial line used in the interface "External
sync. 1".
It is possible to use this interface from the backplane together with the
interface "External sync. 0", as an alternative to the GPS interface.
This interface is accessed through the lower backplane connector.
External O&M (EOM)
The EOM bus is designed as a standard Ethernet port and is intended for a
site-LAN to communicate with other units on the site. Both half-duplex and full-
duplex operation at 10 Mbps and 100 Mbps operation are supported.
The EOM bus is accessed through a connector located on the front of the
DXU marked "EOM". The connector is of type 8–pin RJ-45.
EN/LZT 720 0244 R1A