Westell DSP85 PGAW User Manual

PRODUCT

M A

N UAL

DSP85 Series Digital Repeater

User’s Guide

WESTELL.COM

©Westell Technologies. 960-1666-MNL

rJ1

Digital Repeater Line DSP85 Series

DISCLAIMER

All information and statements contained herein are accurate to the best of Westell Technologies knowledge. Westell Technologies makes no warranty with respect there to, including without limitation any results that may be obtained from the products described herein or the infringement by such products of any property rights of any persons. Use or application of such information or statements is at the users’ sole risk, without any liability on the part of Westell Technologies. Nothing herein shall be construed as license or recommendation for use, which infringes upon any propriety rights of any person. Product material and specifications are subject to change without notice. Westell Technologies standard terms of sale and the specific terms of any particular sale apply.

WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and QUALIFIED INSTALLERS. You must have an FCC LICENSE or express consent of an FCC Licensee to operate this device. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for Each continuing violation.”

WARNING! Changes and Modifications not expressly approved by Westell can void your authority to operate this equipment under Federal Communications Commission’s rules.

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TABLE OF CONTENTS

Preface ............................................................................................................................................................................... ix

Purpose.................................................................................................................................................................................................................. ix

Application ........................................................................................................................................................................................................... ix

Document Organization ................................................................................................................................................................................. ix

Document Conventions ................................................................................................................................................................................... x

Product Registration Information ............................................................................................................................................................... xi

Safety Guidelines ............................................................................................................................................................................................... xi

Important Safety Information ....................................................................................................................................................................... xi

Industry Certifications/Registration Numbers ...................................................................................................................................... xii

Canadian Compliance Information............................................................................................................................................................ xii

Technical Support............................................................................................................................................................................................ xiii

Acronyms and Abbreviations ...................................................................................................................................................................... xiii

1 Product Overview ................................................................................................................................................... 13

1.1 Product Information ........................................................................................................................................................................ 13

1.2 Functional Overview........................................................................................................................................................................ 13

1.3 LED Indicator ...................................................................................................................................................................................... 14

1.4 Local Communication Interface Ports ...................................................................................................................................... 15

1.5 EIA232 Pin Specifications .............................................................................................................................................................. 15

1.6 USB Interface ..................................................................................................................................................................................... 15

1.7 Ethernet ................................................................................................................................................................................................ 16

1.8 Monitoring and Alarms .................................................................................................................................................................. 16

1.9 Circuit Operational Description .................................................................................................................................................. 16

1.10 Functional Block Diagrams ........................................................................................................................................................... 16

2 Optimizing the System during Installation ........................................................................................................ 19

2.1 System Setup Considerations ..................................................................................................................................................... 19

2.2 Suggested Spectrum Analyzer Setting .................................................................................................................................... 19

2.3 Important Installation Notes ....................................................................................................................................................... 20

2.4 Installation Guidelines .................................................................................................................................................................... 20

2.4.1 Donor Antenna ............................................................................................................................................................................ 20

2.4.2 Antennas ......................................................................................................................................................................................... 21

2.5 Optional Accessories ...................................................................................................................................................................... 21

2.5.1 Outside Donor Antenna ........................................................................................................................................................... 21

2.5.2 Inside Omnidirectional Antenna ........................................................................................................................................... 21

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2.5.3 Power Dividers ............................................................................................................................................................................. 21

2.5.4 Grounding Kit ............................................................................................................................................................................... 21

2.5.5 Directional Couplers .................................................................................................................................................................. 22

2.5.6 19” Rack Shelf ............................................................................................................................................................................... 22

2.5.7 UPS.................................................................................................................................................................................................... 22

2.5.8 Cross Band Couplers .................................................................................................................................................................. 22

3 Web-based GUI ....................................................................................................................................................... 23

3.1 Web-based GUI Session ................................................................................................................................................................ 23

3.2 System Status .................................................................................................................................................................................... 24

3.3 Local Network .................................................................................................................................................................................... 25

3.4 RF Configuration .............................................................................................................................................................................. 26

3.5 Program a Filter ................................................................................................................................................................................ 27

3.6 Remote Network .............................................................................................................................................................................. 28

3.7 SNMP Configuration ....................................................................................................................................................................... 29

3.8 Time Configuration ......................................................................................................................................................................... 29

3.9 System Health.................................................................................................................................................................................... 30

3.10 Install and Upload ............................................................................................................................................................................ 31

3.11 Reboot .................................................................................................................................................................................................. 32

3.12 Alarm Configuration ....................................................................................................................................................................... 33

3.13 Email Configuration......................................................................................................................................................................... 34

3.14 Log Configuration ............................................................................................................................................................................ 35

3.15 Account Credentials ........................................................................................................................................................................ 36

4 Console Interface .................................................................................................................................................... 37

4.1 Text Menu Interface (Local Access) ........................................................................................................................................... 37

4.2 Telnet Session (Remote Access) ................................................................................................................................................. 42

4.3 Modem Interface (Remote Access with Login) .................................................................................................................... 44

4.4 Additional Tips .................................................................................................................................................................................. 45

Appendix A Attenuation and Dynamic Range Guidelines ................................................................................. 49

A.1 Donor Port .......................................................................................................................................................................................... 49

A.2 Server Port .......................................................................................................................................................................................... 49

A.3 Dynamic Range Thresholds ......................................................................................................................................................... 50

A.4 Large Deltas between In-band and Composite Input Signals ....................................................................................... 50

Appendix B

Band Plans

and Filter File Naming Conventions ................................................................................. 51

B.1 Frequency Band Plans .................................................................................................................................................................... 51

B.1.1 700 MHz Lower A, B and C Band Plan ................................................................................................................................ 51

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B.1.2 700 MHz Upper C Band Plan .................................................................................................................................................. 52

B.1.3 Cellular Frequency Band Plan ................................................................................................................................................. 52

B.1.4 AWS Frequency Band Plan ...................................................................................................................................................... 53

B.1.5 Canadian PCS Frequency Band Plan .................................................................................................................................... 53

B.1.6 US PCS Frequency Band Plan ................................................................................................................................................. 54

B.1.7 Public Safety Bands .................................................................................................................................................................... 54

B.2 Filter File Naming Conventions .................................................................................................................................................. 55

B.2.1 700 MHz Filter Naming Convention .................................................................................................................................... 55

B.2.2 Cellular Filter File Naming Convention ............................................................................................................................... 56

B.2.3 Canadian PCS Filter File Naming Convention .................................................................................................................. 57

B.2.4 US PCS Filter File Naming Convention ................................................................................................................................ 58

B.2.5 AWS Filter Naming Convention ............................................................................................................................................ 60

Appendix C LTE Attenuator and Installation Notes ................................................................................................ 61

C.1 Important LTE Attenuator and Installation Notes - Donor and Server Isolation .................................................... 61

C.1.1 Line of Sight Propagation Path Loss Table ........................................................................................................................ 61

Appendix D Mechanical and Electrical Specifications ........................................................................................ 62

D.1 Digital Repeater Mechanical and Electrical Specifications .............................................................................................. 62

D.1.1 Mechanical Specifications .................................................................................................................................................. 62

D.1.2 Electrical Specifications........................................................................................................................................................ 63

D.1.3 Power Requirements ............................................................................................................................................................ 63

D.1.4 Environmental Requirements ............................................................................................................................................ 63

D.1.5 Operating Power Parameters ............................................................................................................................................ 64

Appendix E Port Configurations ............................................................................................................................... 65

E.1 Digital Repeater Port Configurations, Original Series ....................................................................................................... 65

E.1.1 Dual-band D2:D1 Port Configuration ................................................................................................................................. 65

E.1.2 Dual-band D1:D2 Port Configuration ................................................................................................................................. 65

E.1.3 Dual-band D2: D2 Port Configuration ................................................................................................................................ 66

E.1.4 Dual-band D1:D1 Port Configuration ................................................................................................................................. 66

E.1.5 Single-band D1:D1 Port Configuration .............................................................................................................................. 67

E.1.6 Dual-band D2:S4 Port Configuration .................................................................................................................................. 67

E.1.7 Dual-band D1:S4 Port Configuration .................................................................................................................................. 68

E.1.8 Single-band D1:S2 Port Configuration ............................................................................................................................... 68

E.2 Digital Repeater Port Configurations ....................................................................................................................................... 69

E.2.1 Dual-band D2:D1 Port Configuration ................................................................................................................................. 69

E.2.2 Dual-band D1:D2 Port Configuration ................................................................................................................................. 69

E.2.3 Dual-band D2:D2 Port Configuration ................................................................................................................................. 70

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E.2.4 Dual-band D1:D1 Port Configuration ................................................................................................................................. 70

E.2.5 MIMO Port Configuration ........................................................................................................................................................ 70

E.2.6 Single-band D1:D1 Port Configuration .............................................................................................................................. 71

E.2.7 Dual-band D2:S4 Port Configuration .................................................................................................................................. 71

E.2.8 Dual-band D1:S4 Port Configuration .................................................................................................................................. 72

E.2.9 Single-band D1:S2 Port Configuration ............................................................................................................................... 72

Appendix F Mechanical Configurations ................................................................................................................... 73

F.1 DSP85-250 and DSP85-251 Series Mechanical Drawing ................................................................................................. 73

F.2 DSP85-250 and DSP85-251 Series Mounting ....................................................................................................................... 74

Appendix G Acronyms and Abbreviations ........................................................................................................... 76

TABLE OF FIGURES

Figure P-1: Product Registration Information .............................................................................................................................................. xi

Figure 1-1: DB-9 Pin Descriptions ................................................................................................................................................................. 15

Figure 1-2: Dual Band Functional Block Diagram ..................................................................................................................................... 17

Figure 1-3: Single Band Functional Block Diagram .................................................................................................................................. 18

Figure 3-1: User Connection Login ................................................................................................................................................................. 23

Figure 3-2: System Status ................................................................................................................................................................................... 24

Figure 3-3: Local Network .................................................................................................................................................................................. 25

Figure 3-4: RF Configuration ............................................................................................................................................................................. 26

Figure 3-5: Program a Filter .............................................................................................................................................................................. 27

Figure 3-6: Remote Network............................................................................................................................................................................. 28

Figure 3-7: SNMP Configuration ..................................................................................................................................................................... 29

Figure 3-8: Time Configuration ........................................................................................................................................................................ 29

Figure 3-9: System Health .................................................................................................................................................................................. 30

Figure 3-10: Install & Upload............................................................................................................................................................................ 31

Figure 3-11: Reboot .............................................................................................................................................................................................. 32

Figure 3-12: Alarm Configuration ................................................................................................................................................................... 33

Figure 3-13: Email Configuration .................................................................................................................................................................... 34

Figure 3-14: Log Configuration ........................................................................................................................................................................ 35

Figure 3-15: Account Credentials .................................................................................................................................................................... 36

Figure 4-1: Null Modem Cable ......................................................................................................................................................................... 37

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Figure 4-2: Gender Adapter .............................................................................................................................................................................. 37

Figure 4-3: Tera Term Pro Web Start Up ...................................................................................................................................................... 37

Figure 4-4: Serial Radio Button ........................................................................................................................................................................ 38

Figure 4-5: Setup ................................................................................................................................................................................................... 38

Figure 4-6: Serial Port Setup ............................................................................................................................................................................. 39

Figure 4-7: TMI Menus ........................................................................................................................................................................................ 40

Figure 4-8: Adjust Gain........................................................................................................................................................................................ 41

Figure 4-9: User Gain ........................................................................................................................................................................................... 41

Figure 4-10: Selecting Filter Programs .......................................................................................................................................................... 42

Figure 4-11: Default IP Address ....................................................................................................................................................................... 43

Figure 4-12: Login Screen .................................................................................................................................................................................. 43

Figure 4-13: Main Menu ..................................................................................................................................................................................... 44

Figure 4-14: Control Panel ................................................................................................................................................................................. 45

Figure 4-15: View Network Status and Tasks ............................................................................................................................................. 45

Figure 4-16: Change Adapter Settings.......................................................................................................................................................... 46

Figure 4-17: Local Area Network ..................................................................................................................................................................... 46

Figure 4-18: Internet Protocol Version 4 (TCP/IPv4) ............................................................................................................................... 47

Figure 4-19: Enter IP Address ........................................................................................................................................................................... 47

TABLE OF TABLES

Table P-1: Document Conventions .................................................................................................................................................................... x

Table A-1: Dynamic Range Thresholds ......................................................................................................................................................... 50

Table B-1:

Table B-2: Cellular Filter File Naming Convention.................................................................................................................................... 56

Table B-3:

Table B-4: US

Table C-1: Line of Sight Propagation Path Loss Table ............................................................................................................................ 61

Table D-1: Mechanical Specifications ............................................................................................................................................................ 62

700 MHz Filter Naming

Canadian PCS Filter

PCS Filter

File

Naming

Convention ........................................................................................................................................... 55

Naming

Convention .......................................................................................................................... 57

Convention ....................................................................................................................................... 58

Table D-2: Electrical Specifications ................................................................................................................................................................. 63

Table D-3: Power Requirements ...................................................................................................................................................................... 63

Table D-4: Environmental Requirements ..................................................................................................................................................... 63

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Table D-5: Operating Power Parameters ......................................................................................................................................................64

Table G-1: Acronyms and Abbreviations ..................................................................................................................................................... 76

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Preface

This Preface includes the following:

 Purpose

 Application

 Document Organization

 Document Conventions

 Product Registration Information

 Safety Guidelines

 Important Safety Information

 Industry Certifications/Registration Numbers

 Technical Support

 Acronyms and Abbreviations

Purpose

The purpose of this document is to provide a procedure to help experienced technicians/engineers install and commission an in-building wireless enhancement repeater system using Westell Technologies digital repeaters. This document was written to address the practical concerns of the installer. Following the procedures in this manual will minimize risks associated with modifying a live system and will prevent service interruptions. This document assumes the technician/engineer understands the basic principles and functionality involved with repeater and in-building systems.

Application

Apply this

guide when

adding

digital repeater capability

to an

existing system

as part of a

new installation.

Document Organization

This manual includes the following chapters:

Chapter 1: Product Overview – Provides an overview of the DSP85 Repeater Series

Chapter 2: Optimizing the System during Installation – Provides information for optimization of the system

Chapter 3: Web-Based GUI – Provides information about using the system through a web-based graphical user

interface

Chapter 4: Console Interface – Provides information about local access to the repeater through console interface

Appendix A: Attenuation and Dynamic Range Guidelines – Provides information about attenuation and dynamic

range guidelines

Appendix B: Band Plans and Filter File Naming Conventions – Provides information about the band plans and filter file naming conventions

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Convention

Description

DANGER!

Description of an imminent hazard that, if not avoided, may result in severe injury or death.

WARNING!

Description of an imminent hazard that, if not avoided, may result in injury or serious equipment damage.

CAUTION

Description of an imminent hazard that, if not avoided, could result in equipment damage.

IMPORTANT

Additional information that is very important for the user to know. More critical than a note, but does not contain a Danger!, Warning! or Caution.

NOTE

Additional information or comments that may be beneficial for the user to know.

Bold

Bold typeface indicates commands, buttons, keyboard keys, user interface elements, and provides emphasis.

Command1 > Command2

The > symbol between commands indicates a succession of commands. For example, select Start > Settings.

Key1+Key2

A plus sign between key names indicates simultaneous keyboard commands. Press and hold down the first key while pressing the second key. For example, Ctrl+X.

DSP85 Series

Appendix C: LTE Attenuator and Installation Notes – Provides the LTE Attenuator and installation notes including donor and server isolation

Appendix D: Mechanical and Electrical Specifications– Provides mechanical and electrical specifications for this product

Appendix E: Port Configurations – Details and illustrates the port configurations for each repeater type

Appendix F: Mechanical Configurations – Details and illustrates the mechanical configuration for each repeater type

Appendix G: Acronyms and Abbreviations – Provides a table of acronyms and abbreviations used in this manual and a definition for each

Document Conventions

Table P-1 lists the conventions used throughout this document.

Table P-1: Document Conventions

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Product Registration Information

The product serial number is located on the label on the bottom panel, near the power connectors. Record the serial number, model number, purchase date and point-of-sale company in the boxes in Figure P-1 below. Retain this manual, along with proof of purchase, to serve as a permanent record of your purchase.

Figure P-1: Product Registration Information

Safety Guidelines

The general safety information in this section applies to both operating and service personnel. Specific warnings and cautions are located in other parts of this manual to which they apply, but may not appear in this summary. Failure to comply with these precautions or specific warnings elsewhere in the manual violates safety standards of design,

manufacture, and intended use of equipment. Westell Technologies assumes no liability for the customer’s failure to

comply with these requirements:

Grounding: This digital repeater system is designed to operate from 100 - 240 VAC and must always be operated with the ground wire properly connected. Do not remove or otherwise alter the grounding lug on the power cord.

Explosive atmospheres: To avoid explosion or fire, do not operate this product in the presence of flammable gases or fumes.

Lightning danger: Do not install or adjust this unit during an electrical storm. We strongly recommend the use of a suitable lightning arrester.

There are no user-serviceable parts inside the repeater.

DANGER!

Hazardous voltages are present when the cover is removed. Do not open the repeater enclosure. If you suspect a malfunction with this product, call your dealer or call Westell Technologies technical support line at 1.877.844.4274.

WARNING!

Disconnect/remove power before connecting or disconnecting cables.

Important Safety Information

Antennas used to radiate signals indoors are limited to a maximum gain of 3 dBi. The outdoor antenna used to communicate to the wireless infrastructure is limited to 14dBi gain, or any combination of gain and loss that equals 14 dB at input. Position each antenna to observe minimum separation requirements from all users and bystanders.

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Use the following guidelines when considering separation distances.

 Place indoor antennas such that, under normal conditions, personnel cannot come within 20 cm (~8

in) from any inside antenna. Adhering to this minimum separation ensures that bystanders cannot exceed RF exposures beyond the maximum permissible limit for uncontrolled exposure.

 Position outdoor antennas such that, under normal conditions, personnel cannot approach closer

than 183 cm (~6 ft.). If a directional antenna that has a maximum gain of 14 dBi is used, take precautions to prevent personnel from routinely passing through the main radiation beam at a distance closer than specified.

WARNING! Changes and Modifications not expressly approved by Westell can void your authority to operate this equipment under Federal Communications Commission’s rules.

Industry Certifications/Registration Numbers

FCC

 NVRCSI-DSP85-C/P, NVRCSI-DSP85201CP, NVRCSI-DSP85-U7C, NVRCSI-DSP85-PS7, NVRCSI-

DSP85-PSS8, NVRCSI-DSP25XCP, NVR-DSP251AWS, NVRCSI-DSP25XAWS, NVRCSI-DSP25XS8, NVRCSI-DSP25XL7, NVRDSP-PCSGAWS3, NVRDSP-PCSG, and NVRDSP-AWS3

 4307A-DSP25XHCP, 4307A-DSP25XS8, 4307A-DSP251AWS

 Power supply: UL60950-1

Canadian Compliance Information

This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

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Technical Support

If you suspect a malfunction with this product or if you have a technical question, call your dealer or the Westell Technologies In-Building Wireless Support Line at (603) 626-6677, Toll Free (USA) 1-877-844-4274, press option 2 then option 1, or email us at ibwsupport@westell.com.

Acronyms and Abbreviations

Refer to the Appendix G at the end of this manual for definitions of the acronyms and abbreviations used in this manual.

1 Product Overview

1.1 Product Information

Westell Technologies digital repeaters were developed for use within enclosed structures where sufficient signal strength from local cell sites to operate cell phones is unavailable. Adequate signal strength must be available outside the structure as a prerequisite to achieving in-building coverage. The digital repeater is connected to an external antenna, usually on the roof, and to one or more internal antennas placed strategically throughout the area where wireless service is desired.

The external antenna is typically a directional type, such as a Yagi antenna. Internal antennas are typically omnidirectional, though repeater amplifies both the uplink

various other types may be used, depending on the coverage application. The Westell DSP

(phone to tower) and downlink (tower to phone) signals, facilitating

communications to and from the intended wireless infrastructure.

With a maximum total of 85 dB nominal gain on both the uplink and downlink, gain can be adjusted over a range from 53.5 dB to 85 dB in 0.5 dB steps. The repeater is controlled with a computer connected to COM port 1 or 2 or via a crossover ethernet cable connected to the ethernet port.

A specific filtering process modifies each amplification chain. This process digitally converts the assigned spectrum and then applies digital signal processing (DSP) techniques. DSP is used to create passbands that selects the RF energy passing through either the uplink or downlink paths. After the digital processing is complete, the information is converted back to an analog signal that is applied to the remaining stages of amplification. The resulting signals emitted by the repeater are specific to the network service providers’ requirements. If these requirements change, only the DSP configuration parameters must change. Configuration parameters are created at the factory and supplied as files to be downloaded to the repeater. The filter set configurations stored in memory determine the unit’s adaptability to various field applications. Appendix B describes the band plans and the convention Westell uses to identify and store the files that make up the filter set. All Westell repeaters are shipped with an active filter set that is programmed according to customer specifications. In most cases, the installer will not be required to program a filter.

1.2 Functional Overview

Westell Technologies digital repeaters incorporate the following features for convenient operation, access, protection, and control:

 Network configuration and control using either a web GUI accessed using a web browser or a menu

driven user interface using the serial port. The GUI does not require Internet access.

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 User gain control (affects all passbands)

 Automatic gain control

 Automatic power control

 Overdrive protection (PA limiting)

 Under/Over voltage protection

 Fault protection

 Alarm notification - local/remote

 Upgrade support - local/remote

 External interfaces - USB/ethernet/Serial

 Re-loadable filters - local/remote

 Web-based monitoring and control - local/remote

 Persistent status and error information

1.3 LED Indicator

Westell Technologies automatic safety precautions are built into the amplifier system. In the case of a catastrophic system event, a shutdown circuit will disable all emissions if the uplink input or downlink input is overdriven or if an oscillation or output overpower event occurs. The amplifier will periodically attempt to recover from the detected condition.

Status LED states are:

 Blinking yellow: Unit is migrating the database after an upgrade

 Blinking red: Unit is programming the filter(s) and there is an error condition

 Blinking green: Boot up or unit is programming the filter(s) and no error condition exists

 Solid green: Unit is operational, PA is on

 Solid yellow: Unit is operational, but AGC is on

 Solid red: Unit has an error condition or PA is off

 Dark: Unit is not powered

Check the GUI status page for the nature of the fault.

NOTE

On power up, the repeater requires approximately three minutes for the internal computer to boot. During this time, the LED labeled Power/Fault or Status will slowly blink green on and off at a rate of approximately 1 Hz. This will indicate that the unit

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is in the boot up process. A blinking green LED (two seconds on/three seconds off) indicates a filter configuration file is loading.

IMPORTANT

Do not unplug the repeater while it is in the boot-up process.

1.4 Local Communication Interface Ports

To allow monitoring and control, Westell repeaters are equipped with four ports that provide external communication access: one ethernet, one DB-9 serial, and two USB ports. The ethernet port is a primary communications port to the PC. The serial interface provides communications to a local PC. The USB interface provides a means to download files from a memory device. The DB-9 pin assignments conform to the standard Electronic Industries Association (EIA232) specification. A diagram of the pin descriptions is shown in Figure 1-1.

Figure 1-1: DB-9 Pin Descriptions

Connecting a serial cable to the COM port and using a terminal emulation program with a PC will allow communication to the control processor’s Text Menu Interface (TMI).

1.5 EIA232 Pin Specifications

The connection diagram shown in Figure 1-1 is for reference only. It is intended as a resource for pinout information if it is necessary to adapt your serial cable because of an unusual connector configuration. In the majority of cases, this information is not needed.

1.6 USB Interface

This port is used for software updates and filter file uploads.

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1.7 Ethernet

This port is used to provide local or remote access to the GUI.

1.8 Monitoring and Alarms

The DSP85 Series can be monitored via an ethernet connection using SNMP, SSH and/or HTTP protocols. Public safety DSP models have dry contacts for traditional alarm panel monitoring as well.

1.9 Circuit Operational Description

The repeater uses a single down-conversion/up-conversion scheme. There are multiple RF amplifier stages before each down-converting mixer. The down-converting mixers are followed by a single IF amplifier. A digital signal processor block processes the resultant digitized IF signal generated by an analog-to-digital converter. The filtered digital signal is fed to a digital-to-analog converter and then up-converted to RF. A driver amplifier and power amplifier make up the final gain stages before application to the diplexer. The maximum total system gain (diplexer input to diplexer output) is nominally 85 dB for either the downlink or the uplink paths, with both links having independent manual and Automatic Gain Controls (AGC).

AGC reacts to analog power detection on both the input and output of the uplink and downlink RF chains. A control algorithm continuously monitors these detected values and dynamically adjusts various gain stages. The net system gain value, entered manually, is optimally maintained without exceeding FCC parameters or overdriving the A/D converters.

The Status or Power/Fault LED provides immediate visual indication of the unit’s primary power alarm status. The repeater features automatic shutdown protection as a safety measure if excessive drive is applied to the input or an oscillation condition occurs. When in a protected mode, a control algorithm determines the appropriate method of recovery to a normal, previously defined state, or maintains the protection until it is manually reset. If recovery is established, the LED is illuminated green or available to be reset. Events that trigger errors are saved in the event log.

1.10 Functional Block Diagrams

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Figure 1-2: Dual Band Functional Block Diagram

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Figure 1-3: Single Band Functional Block

Diagram

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2 Optimizing the System during Installation

2.1 System Setup Considerations

Check all cables for shorts and opens. Verify that there are no cables with loose or poor connections. RF leakage could cause oscillation to occur under some conditions.

Check the rooftop antenna (donor antenna), if directional, for proper alignment along the calculated compass heading. Typically, the directional antenna is aimed at the same site that your handset uses, but it may not always be. It is critical that the installer contact the service provider for information about, and approval of, the selected cell site before the system is activated.

IMPORTANT

The installation height of the antenna for AWS band (1700/2100 MHz) operations is

limited to 10 meters above ground for compliance with Section 27.50.

If cables and alignment are acceptable and a problem persists, it may be necessary to use a spectrum analyzer to examine the signal environment in which the repeater is operating. The existence of strong adjacent channel signals within the frequency band(s) can cause the AGC to reduce the amplifier’s gain or cause alarms. In some cases, additional filtering or attenuation may be required to reject these unwanted signals. In some instances, the donor antenna can be repositioned horizontally, to place the interference source in an antenna pattern null. There also may be some cases where the interference from outside signals is so great that they cannot be filtered, reduced or eliminated without expensive (and possibly prohibitive) measures. In these cases, it may not be practical to use the repeater for providing coverage to these sites.

2.2 Suggested Spectrum Analyzer Setting

When troubleshooting RF issues and surveying challenging RF environments, it is important to have a spectrum analyzer that is capable of measuring the frequency you are using. Use an attenuator to protect the input when connected to a source of RF power, such as a repeater or a powered DAS.

Measure both uplink and downlink.

Measure downlink on the donor cable and at the output (server) port of the powered repeater.

Measure uplink at the lead from the DAS (on fiber-powered DAS, where the lead would connect to the server port on the repeater) and at the donor port with the repeater power on.

Measurements may also be necessary at server antenna locations. The spectrum analyzer must be equipped with a whip antenna.

Set the resolution bandwidth (RBW) to 200 kHz for GSM and 1 MHz for CDMA. If you cannot select these values, use the closest available values. Set the video filter to about one-tenth of RBW. Set other settings, such as span, to the appropriate values. Ensure that there are no signals above the top of the screen.

If you cannot see an adjacent out-of-band signal when using the 1 MHz RBW filter, decrease the RBW to see the close-in-frequency signals. Set the RBW back when you want to measure the power level.

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2.3 Important Installation Notes

Inadequate isolation between the outside and inside antennas may cause regenerative feedback in the system. This feedback can cause the amplifier to emit a continuous signal at maximum amplitude and, in some cases, interfere with normal operation of the cell site. It is important to consider the layout and placement of the system carefully.

Refer to the Preface Safety Guidelines and Important Safety Information for proper antenna selection and installation.

DANGER!

To avoid serious injury or death and repeater damage, do not install donor or server antennas near overhead power lines or high power components. Allow enough distance so that, if antennas fall, they will not contact those components.

WARNING!

Close proximity to the donor or server antennas with the repeater in operation may expose the user or installer to RF fields that exceed FCC limits for human exposure.

Amplifier or handset damage may occur if a handset is connected directly to the repeater or to the coax that leads to the repeater.

2.4 Installation Guidelines

2.4.1 Donor Antenna

 Accurately determine the azimuth to the donor cell site.

 Obtain the donor site information and approval from the service provider/carrier.

 Ensure that the radiation path to the donor cell site is as unobstructed as possible.

 Mount the donor antenna at or toward the edge of the roof, in the direction of the donor site. Try

to avoid having the RF signal from the donor pass above the location(s) of the service antennas. Normally, service antennas are located behind and below the donor antenna (as viewed from above). This approach will help avoid interference and feedback to and from the service antennas.

 Normally, mounting the donor antenna higher will allow a less obstructed path to the donor site.

However, in high traffic metro areas avoid mounting the donor antenna any higher than necessary as the quality of the donor signal may start to become less stable and it is more likely to encounter adjacent channel interference.

CAUTION

 When possible, shield the donor antenna’s rear by locating it so that HVAC units and/or penthouse

structures are behind the antenna, relative to the donor cell site location.

 Ground system components in accordance with NEC 810-15, 21 as required.

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2.4.2 Antennas

 Use omnidirectional antennas indoors, and locate them centrally with respect to the intended

coverage area to minimize signal leakage to the outside. Use directional antennas indoors only in special cases when higher gain and directionality would be helpful and RF exposure limits will not be exceeded.

 To avoid repeater uplink overload and gain limiting, mount the indoor antennas away from areas

where mobile subscribers frequently use their phones such as desks or dispatch areas.

 To determine the quantity and locations of indoor antennas, use an appropriate phone’s signal meter

to determine areas of weak signals. These are the approximate areas where indoor antennas may be needed. Be aware the signal from an indoor antenna, in most cases, can be expected to penetrate about two standard office sheetrock-type walls to reach users. After two walls, or if the walls are made of other materials, it may be necessary to split the available signal and add more antennas.

2.5 Optional Accessories

A complete line of accessories is available from Westell. Check with your Westell distributor for any additional items needed. Below are just a few examples suitable for most in-building needs:

2.5.1 Outside Donor Antenna

 PCS - model number CSI-AY/1.85-1.99/10

 Cellular - model number CSI-AY/806-960/14

2.5.2 Inside Omnidirectional Antenna

 Quad-band - model number ClearLink-O/698-2.7K/N

2.5.3 Power Dividers

 2:1 - model number ClearLink -SPD2/698-2.7K-LP/N

 3:1 - model number ClearLink -SPD3/698-2.7K-LP/N

 4:1 - model number ClearLink -SPD4/698-2.7K-LP/N

2.5.4 Grounding Kit

 Model number CSI-GKIT

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2.5.5 Directional Couplers

 6 dB - model number ClearLink-DC6/698-2.7K/N

 10 dB - model number ClearLink -DC10/698-2.7K/N

 15 dB - model number ClearLink -DC15/698-2.7K/N

 20 dB - model number ClearLink -DC20/698-2.7K/N

 30 dB - model number ClearLink -DC30/698-2.7K/N

2.5.6 19” Rack Shelf

 Model number CSI-RMS-250

2.5.7 UPS

 Battery backup, two hour single-band, one hour dual-band - model number CS48-985-600

 Battery backup, four hour single-band, two hour dual-band - model number CS48-985-601

2.5.8 Cross Band Couplers

 Quad-band Rack Mount - model number CSI-CM250-7/C/AW/P (700 LTE, Cellular, PCS and AWS)

 Quad-band Wall Mount - model number CSI-CBC/QUAD/N (700 LTE, Cellular, PCS and ASW)

 Tri-band Rack Mount - model number CSI-CM250-U7C/C/P (700 Upper C LTE, Cellular and PCS)

 Tri-band Wall Mount - model number CSI-CBC21/740-1990/N (700 Upper C LTE, Cellular and PCS)

 Tri-band Rack Mount - model number CSI-CM250-L7/C/P (700 Lower A/B/C LTE, Cellular and PCS)

 Tri-band Wall Mount - model number CSI-CBC21/696-1990/N (700 Lower A/B/C LTE, Cellular and

PCS)

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3 Web-based GUI

3.1 Web-based GUI Session

You may access the repeater using a LAN connection and a web browser program such as Internet Explorer, Figure 3-1.

Figure 3-1: User Connection Login

The repeater ships with the default IP address of 192.168.1.100, but you can change it later if you need to.

1. If connecting directly to the repeater from a laptop or PC with a crossover CAT-5e cable or over a LAN, enter the IP address of the repeater into the browser address line to connect.

2. Most users will need to update the TCP/IP settings on their computer to enable connection to a host that has a static IP. Refer to section 4.4 Additional Tips for more information.

a. Select Use the following IP Address and enter the IP address as follows: 192.168.1.x, where

‘x’ is any number from 2 to 254, inclusive, except 100. The subnet mask is 255.255.255.0. Refer questions pertaining to these settings to your IT department, or review section 4.4 Additional Tips.

3. When connection is made, you will be prompted for a user name and password. For the purpose of the GUI session, enter the default user name webuser and the password is csi1234, shown in Figure 3-1. Username and password can be changed as required.

Internet access is not required to use the GUI. If you are connecting using a laptop, verify that your ethernet port has power. Some laptops will not allow ethernet connection when on battery power. If this occurs, connect to AC line power or update the power settings.

NOTE

The GUI screens shown throughout this manual show a dual-band Cell/PCS configuration. They are for illustration purposes only. The actual screen you see will depend on the individual configuration.

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3.2 System Status

After login, the System Status page displays, Figure 3-2. The Navigation Menu on the left side of the page (highlighted in Figure 3-2) shows available operations. Clicking a menu item displays the page for that operation.

Figure 3-2: System Status

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Westell DSP85 PGAW User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual