DBS3900 LTE TDD V600R007C00 RRU3276 Installation Guide Issue Draft A Date 2015-10-30 HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2015. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.
DBS3900 LTE TDD RRU3252/RRU3256 Installation Guide About This Document About This Document Purpose This document describes the process of installing a DC RRU3276 (referred to as RRU in this document). Product Version The following table lists the product version related to this document.
DBS3900 LTE TDD RRU3252/RRU3256 Installation Guide About This Document 5 Installation Process The installation process involves installing an RRU and RRU cables, checking the RRU hardware installation, and powering on the RRU. 6 Hoisting the RRU and Cables onto a Tower This section describes how to hoist the RRU and Cables onto a tower and provides important notes about the installation. 7 Installing the RRU This chapter describes the procedure for installing the RRU.
DBS3900 LTE TDD RRU3252/RRU3256 Installation Guide About This Document General Conventions Convention Description Times New Roman Normal paragraphs are in Times New Roman. Boldface Names of files, directories, folders, and users are in boldface. For example, log in as user root. Italic Book titles are in italics. Courier New Terminal display is in Courier New. Command Conventions Convention Description Boldface The keywords of a command line are in boldface.
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eRelay DBS3900 RRU3252/RRU3256 Installation Guide Contents Contents About This Document .................................................................................................................... ii 1 Change History .............................................................................................................................. 1 2 Installation Preparations ............................................................................................................. 2 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide Contents 8 Installing RRU Cables................................................................................................................ 65 8.1 Cabling Requirements .................................................................................................................................... 66 8.2 Cable Connections .................................................................................................................................
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 1 Change History 1 Change History This chapter describes changes in the RRU3276 Installation Guide. Draft A (2015-10-30) This is a draft. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 2 2 Installation Preparations Installation Preparations About This Chapter This chapter describes the reference documents, tools, and instruments that must be ready before the installation. In addition, it specifies the skills that installation engineers must have. 2.1 Reference Documents Before the installation, you must be familiar with reference documents. 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 2 Installation Preparations Hammer drill (φ 12 bit to φ 14 bit) Electrostatic discharge (ESD) gloves Vacuum cleaner Heat gun Phillips screwdriver (M3 to M6) Flat-head screwdriver (M3 to M6) Rubber mallet Hydraulic pliers Wire stripper Utility knife Cable cutter Level Adjustable wrench (capacity ≥ 32 mm) Torque screwdriver Torque socket Torque wrench 5 mm Capacity: 17 mm, 21 mm, and 32 mm (M3 to M6) Combination wrench (M3 to M6) Capacity:
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 2 Installation Preparations 2.3 Skills and Requirements for Onsite Personnel Onsite personnel must be qualified and trained. Before performing any operation, onsite personnel must be familiar with correct operation methods and safety precautions. Before the installation, pay attention to the following items: The customer's technical engineers must be trained by Huawei and be familiar with the proper installation and operation methods.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 3 Information About the Installation Information About the Installation About This Chapter Before installing an RRU, you must be familiar with its exterior, ports, installation options, physical supports, and installation clearance requirements. 3.1 RRU Exterior This section describes the exterior and dimensions of an RRU. 3.2 RRU Ports This section describes ports on the RRU panels. An RRU has a bottom panel, cabling cavity panel, and indicator panel.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-1 RRU exterior Figure 3-2 shows RRU dimensions. Figure 3-2 RRU dimensions 3.2 RRU Ports This section describes ports on the RRU panels. An RRU has a bottom panel, cabling cavity panel, and indicator panel. Figure 3-3 shows the ports on the RRU panels. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-3 Ports on the RRU panels Table 3-1 describes ports and indicators on the RRU panels. Table 3-1 Ports and indicators on the RRU panels Item Label Description (1) Ports at the bottom ANT0-ANT3 TX/RX ports. ANT0 port supports RET signal transmission.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide Item (2) Ports in the cabling cavity 3 Information About the Installation Label Description RGPS RGPS port, which is optional. CPRI0/IR0 Optical port CPRI1/IR1 RTN(+) Power supply socket NEG(-) (3) Indicators RUN For details, see 3.3 RRU Indicators. ALM ACT VSWR CPRI0/IR0 CPRI1/IR1 If only two RF ports are required, ANT0 and ANT1 are used by default. The RET ports to be used are determined by the software configuration. 3.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide Label ACT VSWR CPRI0/I R0 CPRI1/I R1 Issue Draft A (2012-11-30) Color Green Red Red or green Red or green 3 Information About the Installation Status Description Blinking on for 1s and off for 1s Alarms are generated. The alarms may be caused by the faults on the related modules or ports. Therefore, the necessity for module replacement is uncertain.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide Label Color Status 3 Information About the Installation Description powered off. 3.4 Installation Options This section describes RRU installation options. An RRU can be installed on a pole, U-steel, angle steel, or wall. Installing an RRU on a Pole Figure 3-4 shows the diameter of a metal pole for installing an RRU. Figure 3-4 Diameter of a pole Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation The diameter of a pole for installing an RRU ranges from 60 mm to 114 mm (2.36 in. to 4.49 in.). The recommended diameter is 80 mm (3.15 in.). If the diameter of a pole ranges from 60 mm to 76 mm (2.36 in. to 2.99 in.), a maximum of three RRUs can be installed on the pole and the side-mounted installation must not be adopted.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-6 RRU installed on a pole Installing an RRU on U-steel It is recommended that only one RRU be installed on U-steel. Figure 3-7 shows U-steel specifications. Figure 3-7 U-steel specifications Figure 3-8 shows an RRU installed on U-steel. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-8 RRU installed on U-steel Installing an RRU on Angle Steel Figure 3-9 shows angle steel specifications. Figure 3-9 Angle steel specifications It is recommended that only one RRU be installed on angle steel. Figure 3-10 shows an RRU installed on angle steel. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-10 RRU installed on angle steel Installing an RRU on a Wall The wall on which RRUs are installed must meet the following requirements: When a single RRU is installed, the wall has a capacity of bearing at least four times the weight of the RRU. Expansion bolts must be tightened with a torque of 30 N·m (265.52 lbf·in.) to ensure the bolts work properly and the wall remains intact without cracks in it.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-11 RRU installed on a wall 3.5 Installation Clearance Requirements of an RRU This section describes the requirements for the installation clearance of a single RRU and multiple RRUs and the requirements for the installation spacing between RRUs. The recommended installation clearance ensures normal running and provides an appropriate space for OM.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-12 Recommended clearance for a single RRU Minimum Clearance for a Single RRU Figure 3-13 shows the minimum clearance for a single RRU. Figure 3-13 Minimum clearance for a single RRU Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Minimum Clearance for a Single RRU Installed on a Tower Figure 3-14 shows the minimum clearance for a single RRU installed on a tower. Figure 3-14 Minimum clearance for a single RRU installed on a tower 3.5.2 Clearance for Multiple RRUs This section describes the recommended and minimum clearance for multiple RRUs.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-15 Recommended clearance for multiple RRUs installed in centralized mode Minimum Clearance for Multiple RRUs Installed in Centralized Mode Figure 3-16 shows the minimum clearance for multiple RRUs installed in centralized mode.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-17 Recommended clearance for multiple RRUs installed on a wall in standard mode Minimum clearance for multiple RRUs installed on a wall in standard mode Figure 3-18 shows the minimum clearance for multiple RRUs installed on a wall in standard mode.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Recommended Clearance for Multiple RRUs Side-Mounted on a Wall Figure 3-19 shows the recommended clearance for multiple RRUs side-mounted on a wall. Figure 3-19 Recommended clearance for multiple RRUs side-mounted on a wall 3.5.3 Spacing Between RRUs This section describes the horizontal and vertical installation spacing between RRUs.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Figure 3-21 Minimum horizontal spacing between RRUs Recommended vertical spacing between RRUs Figure 3-22 shows the recommended vertical spacing between RRUs. Figure 3-22 Recommended vertical spacing between RRUs Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 3 Information About the Installation Minimum vertical spacing between RRUs Figure 3-23 shows the minimum vertical spacing between RRUs. Figure 3-23 Minimum vertical spacing between RRUs Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 4 4 Unpacking the Equipment Unpacking the Equipment This chapter describes how to unpack and check the delivered equipment to ensure that all the materials are included and intact. Context When transporting, moving, or installing the equipment, components, or parts, you must: Prevent them from colliding with doors, walls, shelves, or other objects.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 4 Unpacking the Equipment If ... Then ... The outer packing is intact Go to Step 3. The outer packing is severely damaged or soaked Find out the cause and report it to the local Huawei office. The shockwatch label is red Stop unpacking the wooden crate, and then report it to the transportation company. Step 3 Check the type and quantity of the equipment in the cases according to the packing list. If ... Then ...
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 5 5 Installation Process Installation Process The installation process involves installing an RRU and RRU cables, checking the RRU hardware installation, and powering on the RRU. Figure 5-1 shows the process of installing an RRU. Figure 5-1 Process of installing an RRU Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 6 Hoisting the RRU and Cables onto a Tower Hoisting the RRU and Cables onto a Tower About This Chapter This section describes how to hoist the RRU and Cables onto a tower and provides important notes about the installation. 6.1 Installing an RRU on a Tower This section describes the procedure for installing an RRU on a tower and the precautions that must be taken. The RRU can be installed on a pole, U-steel, or angle steel. 6.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Hoist mounting kits onto the tower and then install the mounting kits before hoisting the RRU onto the tower. When hoisting the mounting kits and RRU, protect them from colliding with the tower. Figure 6-1 Hoisting an RRU onto a tower (1) Lifting sling (2) Fixed pulley (3) Traction sling 1.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-2 Binding mounting kits for the RRU Figure 6-3 Binding the RRU (1) Lifting sling Issue Draft A (2012-11-30) (2) Lifting eye (3) Traction sling Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Each sling has a load-bearing capacity of more than 200 kg (441 lb), the diameter of the sling must be less than 25 mm (0.98 in.), and the angle at the top of the lifting sling [by the knot] must not be greater than 60 degrees. When hoisting the RRU and mounting kits onto the tower, protect them from colliding with the tower.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-5 Incorrect binding method - hoisting the RRU by the lifting eye only 3. Installation engineer B pulls the lifting sling downwards, and installation engineer C pulls the traction sling outwards to protect the RRU from colliding with the tower. Step 2 Installation engineer A catches the RRU and mounting kits and install the RRU. Step 3 Remove the lifting sling and traction sling.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-6 Hoisting fiber optic cables onto the tower (1) Lifting sling (2) Fixed pulley (3) Traction sling Before hoisting fiber optic cables onto the tower, connect the fiber optic cables to the RRU or BBU based on the labels on both ends of the cables and determine the hoisting direction. 1.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-7 Binding fiber optic cables (1) Lifting sling (2) Stretch sling (3) Traction sling Do not remove the stretch sling and protection pipe or bind fiber optic cables using one sling, as shown in Figure 6-8. Figure 6-8 Incorrect binding method 3. Installation engineer B rotates the fiber spools at the speed of 5 m (16.4 ft) to 15 m (49.21 ft) per minute to coil the fiber optic cables.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 4. 6 Hoisting the RRU and Cables onto a Tower Installation engineer C pulls the lifting sling downwards, and installation engineer D pulls the traction sling outwards to protect the fiber optic cables from colliding with the tower. Step 2 Secure the fiber optic cables to the tower vertically using cable clips. Step 3 Remove the lifting sling, traction sling, and protection pipe.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-9 Hoisting power cables onto the tower (1) Lifting sling (2) Fixed pulley 1. After climbing up to the tower, installation engineer A secures the fixed pulley to the tower platform support and leads the lifting sling through the fixed pulley. 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-10 Binding cable ties 3. Installation engineer B wraps the power cable connector with a layer of PVC insulation tape, as shown in Figure 6-11. Wrap the PVC insulation tape from 30 mm (1.18 in.) away from one end of the connector until it reaches the other end of the connector. The total length of the wrapped connector is 100 mm (3.94 in.).
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 6 Hoisting the RRU and Cables onto a Tower Figure 6-11 Wrapping the PVC insulation tape 4. Installation engineer C pulls the lifting sling downwards, and installation engineer B pulls the other end of the lifting sling outwards to protect the power cables from colliding with the tower. Step 2 Secure the power cables to the tower vertically using cable clips. Step 3 Remove the cable ties, PVC insulation tape, and lifting sling.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU 7 Installing the RRU About This Chapter This chapter describes the procedure for installing the RRU. The RRU can be installed on a pole, U-steel, angle steel, or wall as required. Do not stand the RRU upright because the load-bearing capacity of the RF ports at the RRU bottom is low. Place a foam pad or cardboard under an RRU to protect the RRU housing from damage during the installation. 7.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU 7.1 Mounting Kits for an RRU This section describes the bracket assembly and the attachment plate for an RRU. Figure 7-1 shows the bracket assembly for an RRU. Figure 7-1 Bracket assembly for an RRU (1) Plastic screw cap (2) M10 nut (3) Spring washer (4) Flat washer (5) M10x150 bolt (6) Auxiliary mounting bracket (7) Hoist clamp on the main mounting bracket (8) Main mounting bracket Figure 7-2 shows the rear view of an RRU.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-3 Single RRU installed on a pole Figure 7-4 shows two RRUs installed on a pole. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-4 Two RRUs installed on a pole If two RRUs are installed on a pole, the minimum distance between the two sets of mounting kits is the height of an RRU. Figure 7-5, Figure 7-6, and Figure 7-7 show multiple RRUs installed on a pole. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-5 Three RRUs installed on a pole in centralized mode Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-6 Four RRUs installed on a pole in centralized mode Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-7 Six RRUs installed on a pole in centralized mode 7.2.1 Installing a Single RRU This section describes the procedure for installing a single RRU on a pole and the precautions that must be taken during the installation. Prerequisites Before you install an RRU on a tower, the RRU and mounting kits are hoisted onto the tower. For details, see 6.1 Installing an RRU on a Tower.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU If the RRU must be installed on the ground, see Figure 7-8 to determine a position. Figure 7-8 Distance between the main mounting bracket and the ground Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then disassemble the mounting kits, as shown in Figure 7-9.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-10 Bracket assembly installed on a pole Step 4 To secure the bracket assembly to the pole, use a torque wrench with an aperture of 16 mm (0.67 in.) to tighten the two M10 nuts with a torque of 40 N·m (354.03 lbf·in.), as shown in Figure 7-11. Figure 7-11 Securing the bracket assembly (1) Plastic screw cap Do not remove the plastic screw caps from the bolts on the mounting kits.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-12 Installing the RRU on the main mounting bracket ----End 7.2.2 Installing Two RRUs This section describes the procedure for installing two RRUs on a pole and the precautions that must be taken during the installation. Procedure Step 1 Install the first RRU, as shown in Figure 7-13. For details, see 7.2.1 Installing a Single RRU.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Step 3 Remove the attachment plate from the rear of the second RRU and then install it on the RRU front, as shown in Figure 7-14. Figure 7-14 Removing the attachment plate from the rear of the second RRU and then installing it on the RRU front 1. Remove the attachment plate from the RRU rear using an inner hexagon screwdriver. 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-15 Installing the second RRU on the main mounting bracket (1) RRU installed in standard mode (2) RRU installed in reverse mode (3) Cabling cavity ----End 7.2.3 Installing Multiple RRUs This section describes the procedure for installing multiple remote radio units (RRUs) on a pole and the precautions that must be taken during the installation. Context Three, four, or six RRUs can be installed on a pole.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-16 Removing an attachment plate from the RRU rear and installing it on one side of the RRU 1. Use an inner hexagon screwdriver to remove the attachment plate from the RRU rear. 2. Install the attachment plate on one side of the RRU, and use a torque screwdriver to tighten the stainless steel screws on the attachment plate with a torque of 5 N·m (44.25 lbf·in.).
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-18 Installing the second main mounting bracket Step 5 Install the second RRU on the second main mounting bracket, as shown in Figure 7-19. Figure 7-19 Installing the second RRU on the main mounting bracket Step 6 Install the third main mounting bracket and the third RRU, as shown in Figure 7-20. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-20 Installing the third RRU on the main mounting bracket Step 7 Install the second set of mounting kits, as shown in Figure 7-21. The minimum distance between the two sets of mounting kits is the height of an RRU. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-21 Installing the second set of mounting kits Step 8 Install the fourth RRU on the main mounting bracket of the second set of mounting kits, as shown in Figure 7-22. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-22 Installing the fourth RRU on the main mounting bracket ----End 7.3 Installing the RRU on U-Steel This section describes the procedure for installing the RRU on U-steel and the precautions that must be taken during the installation. The RRU installed on U-steel can be mounted to a tower or placed on the ground. It is recommended that only one RRU be installed on U-steel.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-23 Top view of the RRU (1) U-steel If the length of the narrow side of U-steel is less than 40 mm (1.57 in.), install an RRU in mode a or mode b shown in Figure 7-23. Procedure Step 1 Determine a position for installing the main mounting bracket. If the RRU is to be installed on a tower, determine the position for installing the main mounting bracket by referring to 3.5.1 Clearance for a Single RRU.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.) above the ground. Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then disassemble the mounting kits, as shown in Figure 7-25.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-27 Securing the bracket assembly (1) Plastic screw cap Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure 7-28. Figure 7-28 Installing the RRU on the main mounting bracket ----End Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU 7.4 Installing the RRU on Angle Steel This section describes the procedure for installing the RRU on angle steel and the precautions that must be taken during the installation. The RRU installed on angle steel can be mounted to a tower or placed on the ground. It is recommended that only one RRU be installed on angle steel. Prerequisites Before you install an RRU on a tower, the RRU and mounting kits are hoisted onto the tower.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-30 Distance between the main mounting bracket and the ground It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.) above the ground. Step 2 Manually loosen the two M10 nuts on the mounting kits counterclockwise, horizontally remove one end of the M10x150 bolt from the U notch on the auxiliary mounting bracket, and then disassemble the mounting kits, as shown in Figure 7-31.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-32 Bracket assembly installed on angle steel Step 4 To secure the bracket assembly to the angle steel, use a torque wrench with an aperture of 16 mm (0.67 in.) to tighten the two M10 nuts with a torque of 40 N·m (354.03 lbf·in.), as shown in Figure 7-33. Figure 7-33 Securing the bracket assembly (1) Plastic screw cap Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure 7-34.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-34 Installing the RRU on the main mounting bracket ----End 7.5 Installing the RRU on a Wall This section describes the procedure for installing the RRU on a wall and the precautions that must be taken during the installation. Prerequisites The hoist clamp on the main mounting bracket is secured properly.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-35 Marking the anchor points (1) Main mounting bracket (2) RRU It is recommended that the main mounting bracket be 1200 mm to 1600 mm (47.24 in. to 62.99 in.) above the ground. Figure 7-36 Expansion bolt assembly (1) M8x85 bolt (2) Spring washer 8 (3) Plastic tube (4) Flat washer 8 (5) Expansion tube Step 3 Drill holes at the anchor points, and then install expansion bolt assemblies, as shown in Figure 7-37.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-37 Drilling a hole and installing an expansion bolt assembly 1. Use a hammer drill with a φ12 bit to drill holes vertically at the marked anchor points. Ensure that the depth of each hole ranges from 55 mm to 60 mm (2.17 in. to 2.36 in.). Take proper safety measures to protect your eyes and respiratory tract against the dust before drilling holes. 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-38 Securing the main mounting bracket to a wall (1) M8x85 expansion bolts (2) Spring washers (3) Flat washers Step 5 Install the RRU on the main mounting bracket until the RRU snaps shut, as shown in Figure 7-39. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 7 Installing the RRU Figure 7-39 Installing the RRU ----End Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 8 Installing RRU Cables Installing RRU Cables About This Chapter This chapter describes the procedure for installing RRU cables. 8.1 Cabling Requirements Cables must be routed according to the specified cabling requirements to prevent signal interference. 8.2 Cable Connections This section describes the cable connections for a single RRU and multiple RRUs. 8.3 Installation Process This section describes the process of installing RRU cables. 8.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables 8.11 Installing an Optical Fiber Cable This section describes the procedure for installing an optical fiber cable. 8.12 Closing the Cover Plate of an RRU Cabling Cavity This section describes the procedure for closing the cover plate of an RRU cabling cavity. 8.1 Cabling Requirements Cables must be routed according to the specified cabling requirements to prevent signal interference.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Cables must be routed away from heat sources, or heat-insulation materials are added between cables and heat sources. Sufficient slack (recommended for about 0.1 m [0.33 ft.]) is provided in cables at turns or the position close to a device, facilitating cable and device maintenance. Indoor Cabling Requirements Cables are routed indoors through the feeder window.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-1 Securing cables on the cable tray Secure cables on the tower, as shown in Figure 8-2. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-2 Securing cables on the tower Special Cabling Requirements Cabling Requirements for Power Cables Power cables must be installed in the position specified in engineering design documents. If the length of power cables is insufficient, replace the cables rather than adding connectors or soldering joints to lengthen the cables.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables If DC power cables need to be routed close to a device on the tower, secure the cables to the guardrail or pole with cable clips. The device cannot be far away from the position for securing the cables. Cabling Requirements for PGND Cables PGND cables for the base station must be connected to the same ground bar. PGND cables must be buried in the ground or routed indoors.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Do not bind fiber optic cables at turns. Do not stretch, step on, or place heavy objects on fiber optic cables. Keep the cables away from sharp objects. When fiber optic cables are routed, the excess of the cables must be coiled around special devices, such as a fiber coiler. When coiling fiber optic cables, apply even strength. Do not bend the cables with force.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-6 FE/GE cables routed through the cabinet If fiber optic cables need to be routed on the tower platform, lay out the cables on the guardrail with the shortest distance and route the cables along the guardrail. If fiber optic cables need to be routed close to a device on the tower, secure the cables to the guardrail or pole with cable clips. The device cannot be far away from the position for securing the cables.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-7 Cable connections for a single RRU (1) (1) PGND cable (2) RRU RF jumper (3) RRU alarm cable (4) CPRI optical fiber cable (5) RRU power cable (6) RGPS signal cable Figure 8-8 shows the cable connections adopted for a single RRU when the remote electrical tilt (RET) function is provided. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-8 Cable connections for a single RRU (2) (1) PGND cable (2) RRU RF jumper (3) RRU AISG multi-wire cable (4) RRU AISG extension cable (5) CPRI optical fiber cable (6) RRU power cable (7) RGPS signal cable Figure 8-9 shows the cable connections adopted for multiple RRUs when the alarm monitoring function is provided. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-9 Cable connections for multiple RRUs (1) (1) PGND cable (2) RRU RF jumper (3) RRU alarm cable (4) CPRI optical fiber cable or SFP high-speed cable for cascading RRUs (5) RRU power cable (6) RGPS signal cable If you must cascade two or more RRUs in the same cell, for example, to expand the capacity, install the alarm cable to the RRU at the last level.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-10 Cable connections for multiple RRUs (2) (1) PGND cable (2) RRU RF jumper (3) RRU AISG multi-wire cable (4) RRU AISG extension cable (5) CPRI optical fiber cable or SFP high-speed cable for cascading RRUs (6) RRU power cable (7) RGPS signal cable 8.3 Installation Process This section describes the process of installing RRU cables. Figure 8-11 shows the process of installing RRU cables.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-11 Process of installing RRU cables 8.4 RRU Cable List This section describes RRU cable connections. Table 8-1 lists RRU cables. Table 8-1 RRU cables Cable One End The Other End Connector Connected to... Connector Connected to...
eRelay DBS3900 RRU3252/RRU3256 Installation Guide Cable 8 Installing RRU Cables One End Connector The Other End Connected to... Connector Connected to...
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables 8.5 Installing an RRU PGND Cable This section describes the procedure for installing an RRU PGND cable. Context The minimum cross-sectional area of an RRU PGND cable is 16 mm2 (0.025 in.2). The cable has an M6 OT terminal at one end and an M8 terminal at the other end. Procedure Step 1 Prepare an RRU PGND cable. 1. Cut the cable to the required length based on the actual cable route. 2.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-13 Correct direction of an OT terminal Step 3 Label the installed cable by referring to Attaching a Cable-Tying Label. ----End 8.6 Installing an RRU RF Jumper This section describes the procedure for installing an RRU RF jumper. Context The RF ports on the RRU must be connected using RF jumpers to the mapping ANT0 to ANT3 ports on the antenna.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Procedure Step 1 Connect the Type N connector at one end of the RRU RF jumper to the ANT port and use a torque wrench to tighten the connector with a torque of 1 N·m (12.39 lbf·in.), as shown in Figure 8-15.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-16 Waterproofing a connector of the RF jumper (1) PVC insulation tape (2) Waterproof tape Before wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its original length. Before wrapping the PVC insulation tape, do not stretch the PVC insulation tape. Ensure that each layer of tape overlaps more than 50% of the preceding layer.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-17 Waterproofing a dustproof cap (1) Dustproof cap (2) PVC insulation tape (3) Waterproof tape Before wrapping the waterproof tape, stretch the tape evenly until the length of the tape is twice its original length. Before wrapping the PVC insulation tape, do not stretch the PVC insulation tape. Ensure that each layer of tape overlaps more than 50% of the preceding layer.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Procedure Step 1 Connect the DB9 connector at one end of the RRU alarm cable to the RET/EXT_ALM port on the RRU, and connect the eight cord end terminals at the other end to the external alarm device, as shown in Figure 8-18. Figure 8-18 Installing an RRU alarm cable Step 2 Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 1. 8 Installing RRU Cables Connect the waterproofed DB9 connector at one end of the AISG multi-wire cable to the RET/EXT_ALM port on the bottom of the RRU, as shown in Figure 8-19. Figure 8-19 Installing an RRU AISG multi-wire cable 2. Connect the other end of the cable to the standard AISG male connector on the RCU. 3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable. 4.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-20 Installing an RRU AISG multi-wire cable 2. Connect the other end of the AISG extension cable to the standard AISG male connector on the RCU, as shown in Figure 8-21. Figure 8-21 Installing an RRU AISG multi-wire cable 3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable. 4. Label the installed cable by referring to Attaching an L-Shaped Label.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables ----End 8.9 Opening the Cover Plate of an RRU Cabling Cavity This section describes the procedure for opening the cover plate of an RRU cabling cavity. Procedure Step 1 Wear ESD gloves. Take proper ESD protection measures, for example, wear ESD gloves, to prevent electrostatic damage to the boards, modules, or electronic components.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-23 RRU cabling cavity (1) Cover plate (2) Cable diagram on label (3) Cable trough for the optical fiber cable (4) Cable trough for the power cable (5) Waterproof block (6) Clip (7) Cabling cavity - - Step 3 Loosen the screws on the clips, and open the clips, as shown Figure 8-24. Open the clips only for the cables to be installed.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables ----End 8.10 Installing an RRU Power Cable This section describes the procedure for installing an RRU power cable. Prerequisites A tool-less female connector (pressfit type) is added to the RRU power cable on the RRU side. For details, see 11.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to an RRU Power Cable.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Ensure that the exposed shield layer of the power cable is properly tightened using the clip. 2. Connect the other end of the RRU power cable to the output terminal on the DCDU. 3. Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable. 4. Label the installed cable by referring to Attaching a Cable-Tying Label.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Context A CPRI optical fiber cable transmits CPRI signals between a BBU and an RRU. Procedure Step 1 Lower the pullers of two optical modules, insert one optical module into the CPRI0 port on the RRU and the other optical module into the CPRI port on the BBU, and raise the pullers, as shown in Figure 8-26.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables To avoid any damage to optical fiber cables, secure the optical fiber cable in the cable clip near the power cable to leave some slack at the bend. Tighten the screws on the cable clip with a torque of 1.4 N·m (12.39 lbf·in.). Step 3 Connect the end labeled 2A and 2B of the optical fiber cable to the optical module on the BBU side. Step 4 Route the cable by referring to Cabling Requirements. Then, use cable ties to bind the cable.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-28 Closing clips Ensure that the exposed shield layer of the power cable is properly tightened using the clip. Step 2 Insert waterproof blocks into vacant cable troughs in the cabling cavity, as shown in Figure 8-29. Figure 8-29 Correct placement of waterproof blocks Step 3 Close the cover plate of the RRU cabling cavity, and use a torque screwdriver to tighten the screws on the cover plate with a torque of 1.4 N·m (12.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 8 Installing RRU Cables Figure 8-30 Closing the cover plate of the RRU cabling cavity (1) Protection screw Before tightening the screws on the cover plate, ensure that cables and waterproof blocks are properly inserted into troughs. Step 4 Take off the ESD gloves, and pack up all the tools. ----End Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 9 9 Checking the RRU Hardware Installation Checking the RRU Hardware Installation This section describes how to check RRU hardware installation after the installation is complete. Table 9-1 provides the checklist for the RRU hardware installation. Table 9-1 Checklist for the RRU hardware installation SN Item 1 The position for each device conforms to the engineering drawing and meets the space requirement.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 10 Powering On an RRU 10 Powering On an RRU This section describes how to check the power-on status of an RRU after all the devices are installed. Figure 10-1 shows the RRU power-on check process. Figure 10-1 Powering on an RRU Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 10 Powering On an RRU The RRU is provided with -48 V DC power and the external voltage ranges from -32 V DC to -60 V DC. When the RRU is working properly, the RUN indicator blinks one second on and one second off, and the ALM indicator is steady off. Issue Draft A (2012-11-30) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 11 Appendix 11 Appendix About This Chapter This section describes the procedure for adding an easy power receptacle (pressfit type) connector. 11.1 Adding an Easy Power Receptacle (Pressfit Type) Connector to an RRU Power Cable This section describes the procedure for adding an easy power receptacle (pressfit type) connector to an RRU power cable. 11.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 11 Appendix Figure 11-2 Stripping off the specified length of sheath from the power cable Step 3 Strip off the sheath from each core wire, as shown in Figure 11-3. Figure 11-3 Stripping off the sheath from each core wire Ensure that the length of the sheath stripped off from each core wire must match the length of the notch in the easy power receptacle (pressfit type) connector, as shown in Figure 11-4.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 11 Appendix Figure 11-5 Stripping off the sheath from the power cable to expose its shield layer Step 5 Use a Phillips screwdriver to loosen the screws, as shown in Figure 11-6. Figure 11-6 Loosening screws Step 6 Connect the blue core wire labeled NEG(-) to the - port and connect the black core wire labeled RTN(+) to the + port on the easy power receptacle (pressfit type) connector. Then, tighten the screws, as shown in Figure 11-7.
eRelay DBS3900 RRU3252/RRU3256 Installation Guide 11 Appendix Figure 11-8 Easy power receptacle (pressfit type) connectors installed in different ways If the wire connections are incorrect, the equipment cannot be powered on. Correctly connect the wires 10 seconds later. Step 7 Confirm that the core wires are securely connected to the connector, as shown in Figure 11-9.
