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3 RRU Cables
Exterior
The CPRI optical cable is categorized into the multi-mode optical cable and single-mode optical
cable. When the distance between the BBU and the RRU is shorter than 100 m, a multi-mode
optical cable is required. When the distance between the BBU and the RRU is longer than 100
m, a single-mode optical cable is required. A single-mode optical cable connects the BBU to the
ODF and the ODF to the RRU to transmit CPRI signals.
A multi-mode optical cable is a multi-mode cable with a DLC connector at each end.
3-8
Figure 3-8 Multi-mode optical cable
(1) DLC connector
When a multi-mode optical cable is used for connection between the BBU and RRU, the branch
cables on the BBU side and RRU side are 0.34 m and 0.03 m long respectively. When a multi-
mode optical cable is used for connection between RRUs, the branch cables on both RRU sides
are 0.03 m long.
A single-mode optical cable has a DLC connector at one end and two FC connectors at the other
end, as shown in
Figure 3-9 Single-mode optical cable
(1) DLC connector
(3) Label on the branch cable
When a single-mode optical cable is used for connection between the BBU and the ODF, the
branch cables on the BBU side and ODF side are 0.34 m and 0.8 m long respectively.
When a single-mode optical cable is used for connection between the ODF and RRU, the branch
cables on the BBU side and ODF side are 0.03 m and 0.8 m long respectively.
The CPRI optical cable must be connected to the optical module in the CPRI port on the BBU or RRU. The
multi-mode optical cable and single-mode optical cable are used for the multi-mode optical module and single-
mode optical module respectively.
3-10
shows the multi-mode optical cable.
(2) Branch cable
Figure
3-9.
NOTE
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Hardware Description
(3) Label on the branch cable
(2) Branch cable
(4) FC connector
Issue 02 (2010-10-25)
RRU3908 V2
Figure
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