4G RAN (Radio Access Network)
There are two different architectures through which the RU (Radio Unit) and the BBU (Baseband Unit) are connected to each other in a 4G RAN (Radio Access Network). The traditional monolithic base station/Enb architecture consists of radio unit and baseband hardware co-located in a cabinet or shelter at the cell site with the IP-enabled BBU sending and receiving traffic to and from the EPC.
The eNBs are deployed at the bottom of the tower with coax feeder cables carrying the RF signal up and down the tower.
The interface cabling between the RU and the BBU may not be exposed if the two units are both built inside a single cabinet.
In an alternative decoupled architecture, the BBU hardware is located in a cabinet or shelter at the cell site with the IP-enabled BBU sending and receiving traffic from the EPC.
The radio unit is located near antennas on the tower and is connected to the antennas by Coax cable while the RRU is connected to the BBU via a fiber link.
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