Typical
Networking
Mode
Antenna Type and
Quantity of RRUs
Cable Connection
4-way RX diversity l One RRU
l One SRXU
l Two antenna jumpers and one DC
power cable
l The DIN connectors of the two antenna
jumpers are linked to the ANT_RXC
and ANT_RXD ports at the bottom of
the SRXU.
l One end of the DC power cable is
connected to the RET/PWR_SRXU
port at the bottom of the RRU, and the
other end is connected to the
PWR_SRXU socket at the bottom of
the SRXU.
2.3.7 Alarm Cable of the RRU
The cable transmits the 2-channel Boolean alarm signals and 1-channel RS485 signals from
external devices to the RRU. Thus, the external signals are monitored.
Appearance
The cable has a DB15 male connector at one end and eight cord end terminals at the other end,
as shown in Figure 2-13.
NOTE
If the cord end terminals of the cable do no match the ports on the external devices, cut off the cord end
terminals and make proper terminals on site.
Figure 2-13 Alarm cable
Pin Assignment
The cable can transmit 2-channel Boolean alarm signals and 1-channel RS485 signals. Table
2-12 describes the pin assignment for the wires of the alarm cable.
2 RRU and SRXU Hardware
RRU
User Guide
2-18 Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
Issue 01 (2008-04-18)
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