HUAWEI 3900 RRU3953, RRU3953w Remote Radio Unit Hardware Description
Below you will find brief information for 3900 RRU3953, 3900 RRU3953w. The RRU is designed for use in cellular network devices and supports a variety of frequency bands and antenna configurations. The RRU is powered by a -48 V DC power supply and can be installed indoors or outdoors. The RRU also provides several ports for connecting to other devices, including CPRI ports, alarm ports, and RF ports.
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RRU3953&RRU3953w
Hardware Description
Issue
Date
Draft B
2015-01-10
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.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address:
Website:
Email:
Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China http://www.huawei.com
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About This Document
Purpose
This document provides reference for planning and deploying an RRU3953&RRU3953w
(referred to as RRU in this document). It presents the exterior and describes the ports, functions, cable types, connector specifications, and cable connections of the RRU.
Product Versions
The following table lists the product versions related to the RRU3953&RRU3953w.
Product Name
DBS3900
Solution Version l SRAN8.0 and later versions l GBSS15.0 and later versions l eRAN6.0 and later versions
Product Version
V100R008C00 and later versions
Intended Audience
This document is intended for: l Base station installation engineers l System engineers l Site maintenance engineers
Organization
1 Changes in RRU3953&RRU3953w Hardware Description
This section describes the changes in RRU3953&RRU3953w Hardware Description.
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This chapter describes the exterior and function of the RRU as well as the ports and indicators on the RRU.
This chapter describes RRU cables.
4 RF Cable Connections for the RRU3953&RRR3953w
RF cable connections for the RRU vary depending on the configurations of the RRU and antenna.
This chapter describes RRU auxiliary devices.
Conventions
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
Indicates a potentially hazardous situation which, if not avoided, could result in equipment damage, data loss, performance deterioration, or unanticipated results.
NOTICE is used to address practices not related to personal injury.
Calls attention to important information, best practices and tips.
NOTE is used to address information not related to personal injury, equipment damage, and environment deterioration.
General Conventions
The general conventions that may be found in this document are defined as follows.
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Convention
Times New Roman
Boldface
Italic
Courier New
Description
Normal paragraphs are in Times New Roman.
Names of files, directories, folders, and users are in boldface . For example, log in as user root .
Book titles are in italics .
Examples of information displayed on the screen are in
Courier New.
Command Conventions
The command conventions that may be found in this document are defined as follows.
Convention
Boldface
Italic
[ ]
{ x | y | ... }
[ x | y | ... ]
{ x | y | ... }
[ x | y | ... ] *
*
Description
The keywords of a command line are in
Command arguments are in italics vertical bars. One item is selected.
.
boldface .
Items (keywords or arguments) in brackets [ ] are optional.
Optional items are grouped in braces and separated by
Optional items are grouped in brackets and separated by vertical bars. One item is selected or no item is selected.
Optional items are grouped in braces and separated by vertical bars. A minimum of one item or a maximum of all items can be selected.
Optional items are grouped in brackets and separated by vertical bars. Several items or no item can be selected.
GUI Conventions
The GUI conventions that may be found in this document are defined as follows.
Convention
Boldface
>
Description
Buttons, menus, parameters, tabs, window, and dialog titles are in boldface . For example, click OK .
Multi-level menus are in boldface and separated by the ">" signs. For example, choose File > Create > Folder .
Keyboard Operations
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The keyboard operations that may be found in this document are defined as follows.
Format
Key
Key 1 + Key 2
Key 1 , Key 2
Description
Press the key. For example, press Enter and press Tab .
Press the keys concurrently. For example, pressing Ctrl + Alt
+ A means the three keys should be pressed concurrently.
Press the keys in turn. For example, pressing Alt , A means the two keys should be pressed in turn.
Mouse Operations
The mouse operations that may be found in this document are defined as follows.
Action
Click
Double-click
Drag
Description
Select and release the primary mouse button without moving the pointer.
Press the primary mouse button twice continuously and quickly without moving the pointer.
Press and hold the primary mouse button and move the pointer to a certain position.
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Hardware Description Contents
Contents
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Hardware Description 1 Changes in RRU3953&RRU3953w Hardware Description
1
Changes in RRU3953&RRU3953w Hardware
Description
This section describes the changes in RRU3953&RRU3953w Hardware Description.
Draft B (2015-01-10)
This is a draft.
Compared with issue Draft A (2014-09-30), this issue does not include any new information.
Compared with issue Draft A (2014-09-30), this issue includes the following changes:
Topic
Change Description
Added information about the positions of the
RRU label and nameplate.
Compared with issue Draft A (2014-09-30), no information is deleted from this issue.
Draft A (2014-09-30)
This is a draft.
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RRU3953&RRU3953w
Hardware Description 2 RRU Introduction
2
RRU Introduction
About This Chapter
This chapter describes the exterior and function of the RRU as well as the ports and indicators on the RRU.
This section describes the exterior and dimensions of an RRU.
This section describes main functions of an RRU.
2.3 RRU Technical Specifications
This section describes six indicators on an RRU. They indicate the running status of the RRU.
An optical module transmits optical signals between an optical port and an optical fiber.
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2.1 RRU Exterior
This section describes the exterior and dimensions of an RRU.
shows the exterior of an RRU.
Figure 2-1 RRU exterior
2 RRU Introduction
shows RRU dimensions.
Figure 2-2 RRU dimensions
You can obtain the RRU frequency band and power supply information from the configuration label on the cover plate and obtain the RRU name from the nameplate on the side of RRU that
accommodates the conversion bracket. Figure 2-3 shows the positions of the configuration label
and nameplate on the RRU.
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NOTE
The actual label and nameplate may differ from what is shown in the figure.
Figure 2-3 Positions of the label and nameplate
2 RRU Introduction
(1) Configuration label
(4) Power supply module
(2) Nameplate
(5) Module name -
(3) Frequency band
2.2 RRU Functions
This section describes main functions of an RRU.
The Remote Radio Unit (RRU) consists of the high-speed interface unit, signal processing unit, power amplifier, duplexer, extension ports, and power module.
shows the functional structure of the RRU.
Figure 2-4 Functional structure of an RRU
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NOTE
For details about the extension ports, see 2.4 RRU Ports .
The RRU performs the following functions: l Receives downlink baseband data from the BBU and sends uplink baseband data to the
BBU.
l Receives RF signals from the antenna system, down-converts the signals to intermediate frequency (IF) signals, amplifies the IF signals, performs analog-to-digital conversion, and up-converts RF signals to the transmit (TX) band.
l Multiplexes receive (RX) and TX signals on the RF channel so that these signals can share the same antenna channel, and filters the RX and TX signals.
l Provides a built-in Bias Tee (BT). Besides receiving and transmiting RF signals, RRU RF ports A and B transmit coupled RF signals and OOK signals to antennas through the builtin BT. The RF ports A, B, C, and D also supply DC power to the tower mounted amplifier
(TMA).
l The RRU can be powered by the AC/DC power module. In this case, this RRU is called
AC RRU. For details about the AC/DC power module, see AC/DC Power Module User
Guide or OPM15M User Guide .
2.3 RRU Technical Specifications
This section describes technical specifications of an RRU, including supported modes, frequency bands, RF specifications, engineering specifications, and antenna capabilities.
For details about technical specifications of an RRU, see section "Technical Specifications of
RRUs" in the 3900 Series Base Station Technical Description .
2.4 RRU Ports
This section describes ports on the RRU panels. An RRU has a bottom panel, cabling cavity panel, and indicator panel.
shows the ports on the RRU panels.
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Figure 2-5 Ports on the RRU panels
2 RRU Introduction
describes ports and indicators on the RRU panels.
Table 2-1 Ports and indicators on the RRU panels
Item
(1) Ports in the cabling cavity
Silkscreen
RTN(+)
NEG(-)
CPRI0
Remarks
Power supply socket, for details about RRU power cable experience and specifications,
.
Optical/electrical port 0, connected to the
BBU
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Item
(2) Bottom ports
(3) Indicator
Silkscreen
CPRI1
ANT_TX/RXA
ANT_TX/RXB
ANT_RXC
ANT_RXD
EXT_ALM
RET
RUN
ALM
ACT
VSWR
CPRI0
CPRI1
2 RRU Introduction
Remarks
Optical/electrical port 1, connected to the
BBU
TX/RX port A, supporting RET signal transmission
TX/RX port B, supporting RET signal transmission
TX/RX port C
TX/RX port D
Alarm monitoring port used for monitoring one RS485 signal and two dry contact signals
Communication port for the RET antenna, supporting RET signal transmission
For details, see 2.5 RRU Indicators .
NOTE l The port for transmitting RET signals is determined by the software.
l Connect the CPRI0 port to the BBU by default in the single-mode scenario.
2.5 RRU Indicators
This section describes six indicators on an RRU. They indicate the running status of the RRU.
For detailed positions of RRU indicators, see 2.4 RRU Ports .
describes RRU indicators.
Table 2-2 RRU Indicators
Indicator Color
RUN Green
Status
Steady on
Meaning
The power input is available, but the board is faulty.
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Indicator
ALM
ACT
VSWR
CPRI0
Color
Red
Green
Red
Red and green
Status
Steady off
Blinking (on for
1s and off for 1s)
Meaning
No power input is available or the board is faulty.
The board is running properly.
Blinking (on for
1s and off for 1s)
Blinking (on for
0.125s and off for
0.125s)
Steady on
The board software is being loaded or the board is not working.
Alarms are generated, and the module must be replaced.
Alarms are generated. The alarms may be caused by faults on the related board or ports.
Therefore, you need to locate the fault before deciding whether to replace the module.
Steady off
Steady on
No alarms are generated.
The board is working properly when TX channels are enabled or software is being loaded to a board that is not started.
The board is running with TX channels disabled.
Blinking (on for
1s and off for 1s)
Steady off
Blinking (on for
1s and off for 1s)
Steady on
No voltage standing wave ratio (VSWR) alarm is generated.
VSWR alarms are generated on the
ANT_TX/RXB port.
Blinking (on for
0.125s and off for
0.125s)
VSWR alarms are generated on the
ANT_TX/RXA port.
VSWR alarms are generated on the
ANT_TX/RXA and ANT_TX/RXB ports.
Steady green
Steady red
Blinking red (on for 1s and off for
1s)
Steady off
The CPRI link is running properly.
An optical module fails to receive or transmit signals possibly because the optical module is faulty or the optical fiber is broken.
The CPRI link is out of lock because of faults on the mutual lock of dual-mode clock sources or mismatched data rates on CPRI ports.
The optical module cannot be detected or is powered off.
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Indicator Color
CPRI1 Red and green
Status
Steady green
Steady red
Blinking red (on for 1s and off for
1s)
Steady off
Meaning
The CPRI link is running properly.
An optical module fails to receive or transmit signals possibly because the optical module is faulty or the optical fiber is broken.
The CPRI link is out of lock because of faults on the mutual lock of dual-mode clock sources or mismatched data rates on CPRI ports.
The optical module cannot be detected or is powered off.
2.6 Optical Modules
An optical module transmits optical signals between an optical port and an optical fiber.
NOTE
The exterior and labels for an optical module in this document are for reference only.
Exterior
The following figure shows the exterior of an optical module.
Figure 2-6 Exterior of an optical module
Optical Module Label
A label is available on each optical module, which provides information such as rate , wavelength , and transmission mode , as shown in the following figure.
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Figure 2-7 Optical module label
2 RRU Introduction
(1) Rate (2) Wavelength (3) Transmission mode
Optical Module Type
Optical modules can be classified into single-mode and multimode optical modules, which can be distinguished as follows: l The extraction lever of a single-mode optical module is blue and that of a multimode optical module is black or gray.
l The transmission mode is displayed as "SM" on the label of a single-mode optical module and "MM" on the label of a multimode optical module.
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Hardware Description 3 RRU Cables
3
RRU Cables
About This Chapter
This chapter describes RRU cables.
This section describes RRU cable connections.
An RRU PGND cable connects an RRU and a ground bar, ensuring the proper grounding of the
RRU. The maximum length of an RRU PGND cable is 8 m (26.25 ft).
RRU alarm cable is 5 m (16.4 ft).
The 1/2" RRU RF jumper transmits and receives RF signals between an RRU and an antenna.
A fixed-length RF jumper used by an RRU is 2 m (6.56 ft), 3 m (9.84 ft), 4 m (13.12 ft), 6 m
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3.1 RRU Cables
This section describes RRU cable connections.
lists RRU cables.
Table 3-1 RRU cables
Cable One End
Connector
RRU Power
Cable
(in multimode scenarios)
(in single-mode scenarios)
OT terminal (M6,
16 mm 2 or 0.025
in.
2 )
Tool-less female connector
(pressfit type)
Installation
Position
Ground terminal on the
RRU
NEG(-) and
RTN(+) ports on the RRU
Waterproof
DB15 male connector
EXT_ALM port on the
RRU
DLC connector CPRI0 port on the RRU
CPRI1 port on the RRU
DLC connector
DIN male connector
Waterproof DB9 male connector
Standard AISG male connector
CPRI0 port on the RRU
RF ports on the
RRU
RET port on the RRU
Standard AISG female connector on the AISG multi-wire cable
The Other End
Connector
OT terminal
(M8, 16 mm 2 or
0.025 in.
2 )
Depending on the power equipment
Cord end terminal
DLC connector
DLC connector
DIN male connector
Standard AISG female connector
Standard AISG female connector
Installation
Position
Ground terminal on the ground bar
External power equipment
External alarm device
A CPRI port on a board in the BBU
A CPRI port on a board in the BBU
Antenna system
Standard AISG male connector on the RCU or on the AISG extension cable
Standard AISG male connector on the RCU
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3.2 RRU PGND Cable
An RRU PGND cable connects an RRU and a ground bar, ensuring the proper grounding of the
RRU. The maximum length of an RRU PGND cable is 8 m (26.25 ft).
Exterior
A PGND cable is green or green and yellow with a cross-sectional area of 16 mm 2 (0.025 in.
2 ).
An OT terminal is installed at each end of the cable. Figure 3-1 shows a PGND cable.
Figure 3-1 PGND cable
(1) OT terminal (M6, 16 mm 2 or 0.025 in.
2 ) (2) OT terminal (M8, 16 mm 2 or 0.025 in.
2 )
NOTE l If the customer prepares the PGND cable, a copper-core cable with a cross-sectional area of 16 mm 2
(0.025 in.
2 ) or larger is recommended.
l One OT terminal must be added to each end of the PGND cable onsite.
l You can determine the color of the cable and whether to use corresponding two-hole OT terminals based on local regulations.
shows a two-hole OT terminal.
Figure 3-2 Two-hole OT terminal
3.3 RRU Power Cable
The RRU power cable is a -48 V DC shielded cable. It feeds -48 V DC power to an RRU. The maximum length of power supply that an RRU power cable supports is 100 m (328.08 ft).
NOTE
If a power device provided by the customer is used, the recommended specification of the circuit breaker on this power device is 25 A to 30 A.
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Exterior
3 RRU Cables
A tool-less female connector (pressfit type) needs to be added to one end of the RRU power cable and a corresponding terminal needs to be added to the other end based on the requirements
of the connector on the external power device, as shown in Figure 3-3 .
Figure 3-3 RRU power cable
(1) -48 V DC power cable (2) Shield layer (3) Tool-less female connector
(pressfit type)
lists the specifications of an RRU power cable.
Table 3-2 Specifications of an RRU power cable
RRU Type National
Standard
Remote
Distance
RRU3953 or
RRU3953w
European standard
American standard
0~70m
71~100m
0~70m
71~100m
Cross-
Sectional
Area of the
Cable
6mm 2
10mm 2
5.3mm
2
8.2mm
2
OCB Quantity
0
2
0
0
NOTE
When the remote distance of power cables with the cross-sectional area of 10 mm 2 that comply with
European standards ranges from 71 m to 100 m, the power cables must be used with the OCB-01M, for details about the structure, functions, installation, and maintenance of an OCB-01M, see OCB-01M User
Guide .
lists the wire colors of an RRU power cable.
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Table 3-3 Wire Colors of an RRU power cable
Cable Wire Wire Color in Most
Regions
North
American
Standard
Europea n
Standar d
RRU power cable
RTN(+) Black
NEG(-) Blue
Brown
Blue
Wire Color in Other Regions
UK
Blue
Gray
3.4 RRU Alarm Cable
The RRU alarm cable, a shielded straight-through cable, transmits alarm signals from an external device to an RRU so that the base station monitors the operating status of external devices. The
RRU alarm cable is 5 m (16.4 ft).
Exterior
An alarm cable has a DB15 waterproof male connector at one end and eight cord end terminals
at the other end, as shown in Figure 3-4 .
Figure 3-4 Alarm cable
(1) DB15 waterproof male connector (2) Cord end terminal
Pin Assignment
describes the pin assignment for the wires of an RRU alarm cable.
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Table 3-4 Pin assignment for the wires of an RRU alarm cable
RRU
Alarm
Port
Pin of the
Waterpro ofed
DB15
Male
Connecto r
Color Type Cord End
Terminal
Dry contact
X1.2
White and blue
Twisted pair
X2
X1.3
Blue X3
X1.6
X1.7
White and orange
Orange
Twisted pair
X4
X5
Description
SWITCH_INPUT0+
SWITCH_INPUT0-
(GND)
SWITCH_INPUT1+
RS485 X1.10
Twisted pair
X6
SWITCH_INPUT1-
(GND)
APM RX-
X1.11
X1.13
X1.14
White and green
Green
White and brown
Brown
Twisted pair
X7
X8
X9
APM RX+
APM TX-
APM TX+
3.5 CPRI Fiber Optic Cable
CPRI fiber optic cables are classified into multimode fiber optic cables and single-mode fiber optic cables. They transmit CPRI signals.
Multimode fiber optic cables connect the BBU and RRU or interconnect two RRUs. The maximum length of the multimode fiber optic cable between the BBU and RRU is 150 m (492.12
ft) and the multimode fiber optic cable between two RRUs has a fixed length of 10 m (32.81 ft).
A single-mode fiber optic cable consists of the single-mode pigtail and trunk single-mode fiber optic cable, and the single-mode pigtail and trunk single-mode fiber optic cable are interconnected using the ODF. The maximum length of the single-mode pigtail is 20 m (65.62
ft) on BBU side and 70 m (229.66 ft) on RRU side.
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NOTE l The ODF and trunk single-mode fiber optic cable are provided by the customer and must comply with the ITU-T G.652 standard.
l The ODF is an outdoor transfer box for fiber optic cables, which interconnects the single-mode pigtail and trunk single-mode fiber optic cable.
l A multimode fiber optic cable and a single-mode fiber optic cable are connected to a multimode optical module and a single-mode optical module, respectively.
Exterior
Multimode fiber optic cable: The multimode fiber optic cable has a DLC connector at each end, as shown in
.
Figure 3-5 Multimode fiber optic cable
(1) DLC connector (2) Breakout cable (3) Label on the breakout cable
NOTE l When a multimode fiber optic cable connects a BBU and an RRU, the breakout cable on the BBU side is 0.34 m (1.12 ft) and the breakout cable on the RRU side is 0.03 m (0.098 ft).
l When a multimode fiber optic cable connects two RRUs, the breakout cable on both sides is 0.03 m
(0.098 ft).
shows the connection of the multimode fiber optic cable between a BBU and an
RRU.
Figure 3-6 Connection of the multimode fiber optic cable between a BBU and an RRU
(1) Multimode fiber optic cable between a BBU and an RRU
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Single-mode pigtail: The single-mode pigtail has a DLC connector at one end and an FC, LC, or SC connector at the other end, as shown in
.
Figure 3-7 Single-mode pigtail
(1) DLC connector (2) Breakout cable
(3) Label on the breakout cable
(4) FC connector (5) LC connector (6) SC connector
NOTE l When a single-mode pigtail connects a BBU and an ODF, the breakout cables on the BBU side and
ODF side are 0.34 m (1.12 ft) and 0.8 m (2.62 ft), respectively.
l When a single-mode pigtail connects an RRU and an ODF, the breakout cables on the RRU side and
ODF side are 0.03 m (0.098 ft) and 0.8 m (2.62 ft), respectively.
shows the connection of the single-mode pigtail.
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Figure 3-8 Connection of the single-mode pigtail
3 RRU Cables
(1) Single-mode pigtail between a BBU and an ODF (2) Single-mode pigtail between an RRU and an ODF
Selection Principles
The following table describes the principles for selecting CPRI fiber optic cables.
Table 3-5 Principles for selecting CPRI fiber optic cables
Remote
Distance
Less than or equal to 100 m
(328.08 ft)
Selection Principle
Multimode fiber optic cable
Remarks
Connects the BBU and RRU
When it connects two RRUs, the distance between the two RRUs must be equal to or less than 10 m (32.81 ft).
Multimode fiber optic cable Connects the BBU and RRU Greater than
100 m (328.08
ft) and equal to or less than
150 m (492.12
ft)
Recommended: single-mode fiber optic cable (single-mode pigtail and trunk single-mode fiber optic cable)
The single-mode pigtail at the RRU or BBU side is connected to the trunk single-mode fiber optic cable using the ODF.
Greater than
150 m (492.12
ft)
Single-mode fiber optic cable
(single-mode pigtail and trunk single-mode fiber optic cable)
Pin Assignment
describes the labels on and recommended connections for the breakout cables of a
CPRI fiber optic cable.
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Hardware Description 3 RRU Cables
Table 3-6 Labels on and recommended connections for the breakout cables of a CPRI fiber optic cable
Label
1A
Installation Position
Multimode Fiber
Optic Cable
Between a BBU and an RRU
Multimode Fiber
Optic Cable
Between Two
RRUs
CPRI RX port on the
RRU
CPRI RX port on
RRU 1
Single-Mode Pigtail
RX port on the BBU or
CPRI RX port on the
RRU
1B
2A
CPRI TX port on the
RRU
CPRI TX port on
RRU 1
TX port on the BBU or
CPRI TX port on the
RRU
ODF
2B
TX port on the BBU CPRI TX port on
RRU 0
RX port on the BBU CPRI RX port on
RRU 0
ODF
3.6 RRU RF Jumper
The 1/2" RRU RF jumper transmits and receives RF signals between an RRU and an antenna.
A fixed-length RF jumper used by an RRU is 2 m (6.56 ft), 3 m (9.84 ft), 4 m (13.12 ft), 6 m
(19.68 ft), or 10 m (32.81 ft). A variable-length RF jumper used by an RRU has a maximum length of 10 m (32.81 ft).
NOTE l When the distance between an RRU and an antenna is less than 10 m (32.81 ft), one end of the RF jumper is connected to the ANT-TX/RXA or ANT-TX/RXB port at the bottom of the RRU, and the other end is connected to the antenna.
l When the distance between an RRU and an antenna is greater than 10 m (32.81 ft), one end of the RF jumper is connected to a feeder, and the other end is connected to the antenna.
l If the customer prepares the RF jumper, the length of the RF jumper should be as short as possible and not exceed 2 m (6.56 ft.).
Exterior
An RF jumper has a DIN male connector at one end and a customized connector at the other end.
shows an RF jumper with a DIN male connector at each end.
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RRU3953&RRU3953w
Hardware Description
Figure 3-9 RF jumper
3 RRU Cables
(1) DIN male connector
3.7 RRU AISG Multi-Wire Cable
An RRU AISG multi-wire cable connects an RRU and an RCU to transmit control signals from a base station to an RET antenna. When the RRU is connected to the RET antenna, an AISG multi-wire cable transmits RS485 signals. The length of the AISG multi-wire cable is 5 m (16.40
ft).
NOTE
An RCU is a driving motor used for the phase shifter in the RET antenna. It receives control commands from a base station and runs the commands to drive the stepper motor. Using a gear, the stepper motor drives the adjustable phase shifter in the antenna and changes the downtilt angle.
Exterior
An AISG multi-wire cable has a waterproofed DB9 male connector at one end and a standard
AISG female connector at the other end, as shown in
.
Figure 3-10 AISG multi-wire cable
(1) Waterproofed DB9 male connector (2) Standard AISG female connector
Pin Assignment
describes the pin assignment for the wires of an AISG multi-wire cable.
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RRU3953&RRU3953w
Hardware Description
Table 3-7 Pin assignment for the wires of an AISG multi-wire cable
X1 End (Pin of the
Waterproofed
DB9 Male
Connector)
X2 End (Pin of the
Standard AISG
Female Connector)
Color Type
X1.1
X2.1
White and blue
Twisted pair
Blue
X1.3
X2.3
X1.5
X1.4
-
X2.5
X2.4
White and orange
Orange
-
White and green
-
-
Twisted pair
-
X1.9 and X1.4 are interconnected.
-
-
X2.1 and X2.6 are interconnected.
X2.4 and X2.7 are interconnected.
-
3 RRU Cables
Description
+12 V
RS485 B
RS485 A
GND
GND
+12 V
GND
3.8 RRU AISG Extension Cable
When the distance between an RRU and an RCU is longer than 5 m (16.4 ft), an AISG multiwire cable is not long enough to connect the RRU and the RCU. In this case, an AISG extension cable is used to extend the AISG multi-wire cable for transmitting RS485 signals. The length of the AISG extension cable is 15 m (49.21 ft).
Exterior
An AISG multi-wire cable has a standard AISG male connector at one end and a standard AISG
female connector at the other end, as shown in Figure 3-11 .
Figure 3-11 AISG extension cable
(1) Standard AISG male connector
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(2) Standard AISG female connector
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Hardware Description 3 RRU Cables
Pin Assignment
describes the pin assignment for the wires of an AISG extension cable.
Table 3-8 Pin assignment for the wires of an AISG extension cable
X1 End (Pin of the
Standard
AISG Male
Connector)
X1.1
X2 End (Pin of the
Standard
AISG
Female
Connector)
X2.1
Color
White and blue
Type
Twisted pair
X1.7
X2.7
Blue
White and orange Twisted pair
Orange
White and green Twisted pair X1.3
X1.5
X1.6
X2.3
X2.5
X2.6
Green
White and brown Twisted pair
Brown
Description
+12 V
DC Return
RS485 B
RS485 A
+24 V
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RRU3953&RRU3953w
Hardware Description 4 RF Cable Connections for the RRU3953&RRR3953w
4
RF Cable Connections for the
RRU3953&RRR3953w
RF cable connections for the RRU vary depending on the configurations of the RRU and antenna.
Description of RF Cable Connections
This section describes the RF cable connections for the RRU serving a single sector. The following table lists the RF cable connections for the RRU.
Table 4-1 RF cable connections for the RRU
RRU Model Specifications of a
Single RRU
Scenario
RRU3953 and
RRU3953w
For details, see section
"Typical Power
Configuration for RRU
Modules" in chapter
"Configuration
Reference" in 3900
Series Base Station
Initial Configuration
Guide .
2T2R
1T2R+1T2R
2T4R
Illustration of
Cable
Connections
See illustration 1 in
See illustration 2 in
See illustration 3 in
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Hardware Description 4 RF Cable Connections for the RRU3953&RRR3953w
Illustration of Cable Connections
Figure 4-1 RF cable connections for the RRU
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Hardware Description 5 RRU Auxiliary Devices
5
RRU Auxiliary Devices
About This Chapter
This chapter describes RRU auxiliary devices.
An Indoor Floor installation Support (IFS06) is used for installing indoor RRUs.
An Outdoor Cable Conversion Box (OCB) interconnects cables of different core diameters.
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Hardware Description 5 RRU Auxiliary Devices
5.1 IFS06
An Indoor Floor installation Support (IFS06) is used for installing indoor RRUs.
Exterior
shows an IFS06.
Figure 5-1 IFS06
(1) Cable tray
(5) Adjustable beam
(2) Ground bar 2
(6) Ground bar 1
(3) Rear foot
(7) Main frame -
(4) Front foot
Function
l It can be installed on the ground.
l The upper and lower adjustable beams on an IFS06 can be moved up and down to fit for heights of RRUs.
l RRUs can be installed on an IFS06 only when the ambient temperature is higher than or equal to the lowest working temperature of the RRU and at least 5°C (41°F) lower than the highest working temperature of the RRU. In this scenario, the IFS06 supports at least three
RRUs. When the ambient temperature is higher than or equal to the lowest working
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Hardware Description 5 RRU Auxiliary Devices temperature of the RRU and at least 10°C (50°F) lower than the highest working temperature of the RRU, the IFS06 supports a maximum of six RRUs.
NOTE
For details about the operating temperature of the RRU, see section "Technical Specifications of
RRUs" in 3900 Series Base Station Technical Description .
Specifications
describes IFS06 specifications.
Table 5-1 IFS06 specifications
Item
Dimensions (H x W x D)
Specification
1730 mm (79 in.) x 600 mm (23.62 in.) x 600 mm (23.62 in.)
Weight 45 kg (99.23 lb)
5.2 OCB
An Outdoor Cable Conversion Box (OCB) interconnects cables of different core diameters.
Power cables shipped with RRUs cannot support long-distance power supply. Therefore, when power supply is far from the equipment, cables with large core diameters are used, and an OCB connects these cables and RRU power cables.
Application Scenario of an OCB
shows the application scenario of an OCB.
Figure 5-2 Application scenario of an OCB
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Hardware Description 5 RRU Auxiliary Devices
For details about the structure, functions, installation, and maintenance of an OCB, see the OCB
User Guide or OCB–01M User Guide .
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Key features
Transmits and receives RF signals through the antenna
Supports indoor, outdoor, and tower-mounted installation
Supports the transmission of RET signals to antennas
Provides a built-in Bias Tee
Frequently asked questions
The RRU receives downlink baseband data from the BBU and sends uplink baseband data to the BBU. It also receives RF signals from the antenna system, down-converts the signals to intermediate frequency (IF) signals, amplifies the IF signals, performs analog-to-digital conversion, and up-converts RF signals to the transmit (TX) band. The RRU also multiplexes receive (RX) and TX signals on the RF channel so that these signals can share the same antenna channel.
You can obtain the RRU frequency band and power supply information from the configuration label on the cover plate.
The RRU cables include PGND cable, power cable, alarm cable, CPRI fiber optic cable, RF jumper, AISG multi-wire cable, and AISG extension cable.
The maximum length of power supply that an RRU power cable supports is 100 m (328.08 ft).
The maximum length of the multimode fiber optic cable between the BBU and RRU is 150 m (492.12 ft).