User's Manual

RRU3278

Installation Guide

8 Installing RRU Cables

Issue 05 (2017-03-10)

Huawei Proprietary and Confidential

Procedure

Step 1 Use a screwdriver to remove the dustproof cap from the EXT_ALM port on the RRU.

Step 2 Connect the DB15 connector at one end of the RRU alarm cable to the EXT_ALM port at the

RRU bottom, as shown in Figure 8-22.

Install the waterproof DB15 male connector on the RRU alarm cable with caution, preventing the pin

assignment from being damaged.

Figure 8-22 Installing an RRU alarm cable

Step 3 Connect the eight cord end terminals at the other end of the RRU alarm cable to the alarm

device.



Remove insulated protective tubes from the cord end terminals before connecting the cord end

terminals to devices, as shown in Figure 8-23.



Use insulating adhesive tapes to wrap cord end terminals that are not in use and fix them at a proper

position based on the onsite situations. This prevents false alarm reporting and equipment damage

due to contact of exposed cables. Figure 8-24 shows the method for handling cord end terminals not

in use.