11.5 (Optional) Installing RRU Power Cables. Huawei BTS3900L LTE, BTS3900L GSM, BTS3900L, BTS3900L WCDMA

BTS3900L (Ver.C)

Installation Guide

Figure 11-21

Installing a BBU power cable

11 Installing the Cables

----End

11.5 (Optional) Installing RRU Power Cables

When an indoor base station is configured with both RFUs and RRUs, RRU power cables need to be installed to feed power into RRUs.

Context

The following table lists the specifications of RRU power cables.

Table 11-1

Specifications of RRU power cables

Base Station Power Device One End

DCDU-03B OT terminal (M4) BTS3900 (Ver.B) and BTS3900L

(Ver.B)

BTS3900 (Ver.C) and BTS3900L

(Ver.C)

DCDU-11B Tool-less female connector (pressfit type)

The Other End

Depending on the port on the RRU

NOTE

l

The colors and structures of cables vary according to countries and regions. If cables are purchased locally, the cables must comply with local rules and regulations.

l The type of connector connecting to the power port on the RRU depends on the type of the RRU. For details about how to add a connector to an RRU power cable, see the related RRU installation guide.

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BTS3900L (Ver.C)

Installation Guide 11 Installing the Cables

Procedure

Step 1

Prepare RRU power cables.

1.

Cut the power cable to lengths suitable for the actual cable routes.

2.

Add connectors to the RRU power cables on the DCDU side.

l For details about how to add connectors to RRU power cables for a BTS3900 (Ver.B) or BTS3900L (Ver.B), see Assembling the OT Terminal and the Power Cable.

l For details about how to add connectors to RRU power cables for a BTS3900 (Ver.C) or BTS3900L (Ver.C), see Assembling the Tool-Less Female Connector (Pressfit Type) and the Power Cable(2).

Step 2

Add a correct connector to the RRU power cable on the RRU side and connect the connector to the power port on the RRU. For details, see the related RRU installation guide.

CAUTION

Ensure that the RRU power cable for an RRU added to a running base station must be connected to the RRU first and then to the power equipment. The operations in the reverse sequence may cause component damage or personal injury.

NOTE

When installing RRUs outdoors, use a ground clip to ground RRU power cables near the feeder window before routing them into the equipment room. However, this grounding measure is not required for RRUs installed indoors. As an example, the following figure shows the procedure for installing power cables for

RRUs installed outdoors.

Step 3

Optional:

Route the RRU power cable from the RRU side to the DCDU side through the feeder window. Install a ground clip near the feeder window outside the equipment room, and connect the PGND cable on the ground clip to the external ground bar. The installation procedure of ground clip is as follows:

1.

Use a utility knife to strip 63 mm (2.48 in.) long jacket off the power cable to expose the shield layer.

Figure 11-22

Stripping the jacket off the power cable

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2.

Wrap the copper sheet of the ground clip around the shield layer of the power cable, and use cable ties to bind them tightly. Then trim off surplus part from the heads of the cable ties without leaving any sharp edge.

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BTS3900L (Ver.C)

Installation Guide 11 Installing the Cables

Figure 11-23

Wrapping and tying the copper sheet of the ground clip

(1) Hole for a cable tie (12AWG/4 mm

2

or 0.006 in.

2

) (2) Hole for a cable tie ( ≥ 6 mm

2

or 0.009 in.

2

)

3.

Wrap three layers of waterproof tape and three layers of insulation tape around the ground clip.

Figure 11-24

Wrapping the waterproof tape and insulation tape

(1) Waterproof tape

(4) Power cable

(2) Insulation tape

(5) PGND cable -

(3) Cable tie

Issue 07 (2013-11-08)

NOTICE

Trim off surplus part of the cable ties at the position 3 mm (0.12 in.) to 5 mm (0.20 in.) away from the head of the cable tie.

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