Fiber Span FS71C-85 Digital Narrowband Class A Signal Booster User Manual revised

Fiber-Span LLC Digital Narrowband Class A Signal Booster revised

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FS71C 85 User Manual

revised user manual

FS71C-85 Series User Manual| I$Pyright © 2015 Fiber-SpanFS71C-85-USRUser Operation & Maintenance Manual800 MHz Digital Narrowband Repeater UnitFiber-Span, 3434 Route 22 West - Branchburg, NJ 08876 - 908•253•9080, fax 908•273•9086 - www.fiber-span.com

FS71C-85 Series User Manual | IICopyright © 2015 Fiber-SpanCopyright © 2014 Fiber-Span. All Rights Reserved. No part of this publication, or any software included with it may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, including photocopying, electronic, mechanical, recording or otherwise, without the prior written permission of the copyright holder.Fiber-Span provides this document as is, without any warranty of any kind either expressed or implied including, but not limited to, the implied warranties of merchantability and ﬁ tness of a particular purpose. Fiber-Span may make changes or improvements in the equipment, software, or speciﬁ cations described in this document at any time and without notice. These changes will be incorporated in new releases of this document.This document may contain technical inaccuracies or typographical errors. Fiber-Span waives responsibility for any labor, materials, or costs incurred by any person or party as a result of using this document. Fiber-Span and any of its afﬁ liates shall not be liable for any damages (including, but not limited to, consequential, indirect or incidental, special damages or loss of proﬁ ts or date) even if they were foreseeable and Fiber-Span has been informed of their potential occurrence, arising out of or in connection with this document or its use. Fiber-Span3434 Route 22 W., Suite 140Branchburg, New Jersey 08876Tel: (908) 253-9080Fax: (908) 253-9086www.ﬁ ber-span.comLimitation of Liability

FS71C-85 Series User Manual| IIICopyright © 2015 Fiber-SpanWarningsOnly a qualiﬁ ed technician shall be allowed to operate the unit after reading and understanding all the guidelines in this manual.An exclamation point denotes attention to state-ment required.Follow and comply with all site Safety Policies.Do not touch heat sink while equipment is in operation, as surface may be very HOT.Terminate every RF port with a 50 Ohm load.Note: Factory limit is set to +37 dBm composite output power for both UL & DL paths. Part 20 & 90 Signal BoostersTHIS IS A 90.219 CLASS A DEVICE”“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. You MUST register Class B signal boosters (as deﬁ ned in 47 CFR 90.219) online at HYPERLINK “http://www.fcc.gov/signal-boosters/registration” www.fcc.gov/signal-boosters/registration. Unauthorized use may result in signiﬁ cant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation.”Part 20 Industrial Boosters“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 signiﬁ cant forfeiture penalties, including penal-ties in excess of $100,000 for each continuing violation.”

FS71C-85 Series User Manual | IVCopyright © 2015 Fiber-SpanRevision HistoryVersion Description Date Author1.0 Initial Release 01-Aug-2014 DT1.1 GUI Screen shots and descriptions updated 01-Feb-2015 HW1.1a pg18 DL Setup 25-Feb-2015 HW1.1k FCC statement clariﬁ ed 10-Aug-2015 HWInformation in this document is subject to change without notice.Please send comments to:E-mail: techinfo@Fiber-Span.comPhone: 908-253-9080 | Fax: 908-253-90861.1L FCC statement updated 12-Oct-2015 HW 1.1mFCC Website Link Correction14-Oct-2015LT1.1nFCC statement update on pg. 31 29-Oct-2015 LT

FS71C-85 Series User Manual| VCopyright © 2015 Fiber-SpanTable of ContentsLimitation of Liability . . . . . . . . . . . . . . . iiWarnings . . . . . . . . . . . . . . . . . . . . iiiRevision History . . . . . . . . . . . . . . . . . iv1Company Information 1Contact . . . . . . . . . . . . . . . . . . . . 12Product Introduction 2Theory of Operation . . . . . . . . . . . . . . . 4Product Applications . . . . . . . . . . . . . . . 53Detailed Description 8Overview . . . . . . . . . . . . . . . . . . . . 8Amplifiers . . . . . . . . . . . . . . . . . . . . 8Duplexers . . . . . . . . . . . . . . . . . . . . 9Alarms . . . . . . . . . . . . . . . . . . . . . 9GUI Interface . . . . . . . . . . . . . . . . . . .10Specifications . . . . . . . . . . . . . . . . . .11Outline Drawings . . . . . . . . . . . . . . . . .124Installation Procedure 14Environment . . . . . . . . . . . . . . . . . . .14Connectorization . . . . . . . . . . . . . . . . .14Anchoring . . . . . . . . . . . . . . . . . . . .14Wall-mount Version. . . . . . . . . . . . . . .14Rack-mount Version. . . . . . . . . . . . . . .14Alarms . . . . . . . . . . . . . . . . . . . .14Grounding . . . . . . . . . . . . . . . . . . . .15

FS71C-85 Series User Manual | VICopyright © 2015 Fiber-Span5Setup Procedure 16Overview . . . . . . . . . . . . . . . . . . . .16Cautionary Notes . . . . . . . . . . . . . . . . .16Contents of Package. . . . . . . . . . . . . . . .16HRU Control . . . . . . . . . . . . . . . . . . .16Downlink Setup. . . . . . . . . . . . . . . . . .18De-rating Table . . . . . . . . . . . . . . . . . .20HRU Uplink Control . . . . . . . . . . . . . . . .20Uplink Gain Setup. . . . . . . . . . . . . . . . .216Troubleshooting 22HRU Alarms . . . . . . . . . . . . . . . . . . .22Power LED Indicator . . . . . . . . . . . . . . . .23Amplifier Alarms . . . . . . . . . . . . . . . . .23Fan Blockage. . . . . . . . . . . . . . . . . . .23Door Lights . . . . . . . . . . . . . . . . . . .237Warranty Information 24General Warranty . . . . . . . . . . . . . . . . .24Limitations of Warranty . . . . . . . . . . . . . .24Limitations of Damages . . . . . . . . . . . . . .24Return Material Authorization (RMA) . . . . . . . . .248FCC Statement 25Manufacturer’s Notes . . . . . . . . . . . . . . .25Table of Contents (cont’d)

FS71C-85 Series User Manual| 1Copyright © 2015 Fiber-Span1Company InformationFiber-Span is a premier provider of advanced RF ON FI-BER® technologies and solutions for ﬁ ber optic based transmission of high performance radio-frequency wireless voice, data and multiservice networking ap-plications. Fiber-Span offers a full line of ﬁ bered and non-ﬁ bered wireless coverage solutions including Distributed Antenna Systems, Bidirectional Ampliﬁ ers, Digital Nar-rowband DSP based Repeaters and ﬁ ber optic distribu-tion gear. Full featured solutions include redundancy, Network Management Systems and remote web-based access capability. Fiber-Span is addressing public safety needs by pro-viding ﬁ ber optic wireless solutions for police, ﬁ re, emergency, ﬁ rst responder and Homeland Security radio systems applications. Fiber-Span’s solutions for Defense and Military organizations are also leading the way by providing reliable and secure communications links for ground, airborne, shipboard, radar, telemetry, GPS and intelligence solutions in the HF/VHF/UHF and microwave radio frequencies. Fiber-Span’s evolving class of product addresses the growing demand and movement toward the conver-gence of wire line and wireless networks, and the requirement for high performance, high bandwidth RF ON FIBER® solutions and networks. Fiber-Span’s customers are global wireless communica-tion systems original equipment manufacturers (OEM), radio frequency (RF) system integrators, and military system architects. More information about Fiber-Span products is available from the contact info listed below.ContactFiber-Span3434 Rt. 22W, Suite 140Branchburg, NJ 08876908-253-9080Email: techinfo@ﬁ ber-span.comWeb: http://www.ﬁ ber-span.com

FS71C-85 Series User Manual | 2Copyright © 2015 Fiber-Span2Product IntroductionThis manual covers the Digital Narrowband Headend Repeater Unit (DHRU)., model FS71C-85. The DHRU is the off-air interface to the Distributed Antenna System (DAS) and is typically fed donor signals by coaxial cable from one or more off-air antennas. On the DAS side, the HRU may be connected directly via coaxial cable, or op-tionally, to RRUs via BSU (Base Station Interface Unit) and one or more FTUs (Fiber Transceiver Unit).The following diagram illustrates how the DHRU ﬁ ts into the Fiber-Span System Architecture. Figure 1. Fiber-Span System Architecture & Product FamilyDHRU - Digital Headend Repeater UnitIHU - Integrated Headend Repeater UnitBSU - Base Station Interface UnitFTU - Fiber Transceiver UnitRRU - Remote Repeater UnitCRRU - Compact Remote Repeater UnitBTS - Base Transceiver SystemGPS - Global Positioning System

FS71C-85 Series User Manual| 3Copyright © 2015 Fiber-SpanThe DHRU is used to provide cost-efﬁ cient wireless signal distribution in areas that have poor coverage. Fiber-span has included additional unique hardware in the DHRU that allows it to both power a local passive DAS plus feed ﬁ ber-optic transceivers (FTU). The downlink port is tapped off the output of the downlink ampliﬁ er. The uplink frequencies are com-bined prior to ampliﬁ cation in the uplink ampliﬁ er. The separate downlink and uplink ports are present on the bottom of the wall mount unit or the rear of the subrack version along with the (Donor) Antenna port and a DAS port. Most applications for simple coverage enhancement solutions would require a Bi-Directional Ampliﬁ er (BDA). The DHRU is Fiber-Span’s technology equivalent to the BDA, with the additional functionality of a DSP processore that digitally ﬁ lters the incoming signals with precise narrowband ﬁ lters centered around each incoming individual channel. The DHRU also allows for local coverage via a downlink power ampliﬁ er plus a direct connection to ﬁ ber-optic transceivers for feeding a ﬁ ber DAS.The DHRU ampliﬁ es RF frequencies in both the downlink and uplink paths with duplexers that provide both downlink and uplink frequency bands on a single distributed antenna system. The following block diagram better illustrates how the DHRU is conﬁ gured.Figure 2. DHRU - Internal Block Diagram

FS71C-85 Series User Manual | 4Copyright © 2015 Fiber-SpanTheory of Operation The ampliﬁ ers used in the RRU provide a set amount of gain. Gain is deﬁ ned as the ratio in the amount of RF power of the output and input of the ampliﬁ er. If +20dBm of RF power is required at the RF Out port of the RRU and 0dBm is input to the RF Input port at the FTU, the gain must be set to 20dB.When multiple RF carriers are input to an RF ampliﬁ er, the RF output power will be the input power plus the gain.Power Output = Power input + Gain (in decibels)Power Output = Power input x Gain (in Watts)As seen in the following ﬁ gure, the output power tracks the input power linearly. Eventually as the input power increases, the ampliﬁ er output power reaches the out-put power limit. When this happens, intermodulation products are generated at the ampliﬁ er output. The intermodulation products with the most likelihood of generation are 2nd and 3rd order. For every 1dB increase in input RF power, the 3rd order intermodula-tion products increase 3dB. If one were to plot the 3rd order output power on a graph as in the preceding ﬁ gure, the slope of the 3rd order products would intersect the line of the output power plotted vs. the input power. This point is deﬁ ned as the 3rd Order Intercept point and is used by ampli-ﬁ er manufacturers to characterize the maximum output power of an RF ampliﬁ er.The RF output power of the ampliﬁ ers is deﬁ ned as the total RF output power inside the bandwidth of the duplexers. This RF output power is divided into the number of dominant RF carriers at the output of the ampliﬁ er.Figure 3. HRU Output Power vs Input Power (IP3 Plot)

FS71C-85 Series User Manual| 5Copyright © 2015 Fiber-SpanProduct ApplicationsThe DHRU has several typical applications:• As a single unit to provide coverage for a single band of wireless service;• As multiple units amplifying coverage for multiple services;• As an ampliﬁ er to feed ﬁ ber-optic transceivers and provide RF wireless coverage using coaxial cable fed from the HRU.The following diagrams help illustrate a typical cover-age solution for a single band of wireless serviceFigure 4. Typical DHRU RF Amplification System (Simplified)Indoor AntennasBroadbandRF SplitterCoaxial CableDirectional AntennaHRUAntenna PortDAS PortDonor Site

FS71C-85 Series User Manual | 6Copyright © 2015 Fiber-SpanFigure 5. Typical HRU Multi-Service Signal Distribution SystemIndoor AntennasBroadbandRF SplitterCoaxial CableDirectional AntennaBase Station Interface UnitDonor SiteBSUHRU HRUHRU

FS71C-85 Series User Manual| 7Copyright © 2015 Fiber-SpanFigure 6. Typical DHRU-to-Multiple RRU Signal Distribution SystemAntennaPortDAS PortDownlinkPortUplinkPortAC PowerFTUHRUFiber-Optic Transceiver UnitTo DASTo DASTo DASTo DASTo DASDLAmpULAmpPowerSupplyRRURRURRURRU

FS71C-85 Series User Manual | 8Copyright © 2015 Fiber-Span3Detailed DescriptionThis section deals with the actual components that are assembled to make up the DHRU. The main subassem-blies/subsystems are:1. RF Ampliﬁ ers - These provide RF signal ampliﬁ ca-tion.2. Duplexers - These units separate and combine downlink and uplink frequency spectra, and re-duce interference.3. Digital Signal Processor - Provides settable nar-rowband ﬁ lters around eacch incoming channel.4. Control Board - Provides the USB interface for GUI Program for setting channel centers, ﬁ lter band-OverviewAmpli ersThere are two types of ampliﬁ ers that Fiber-Span uses to provide the appropriate amount of gain required to provide coverage solutions:1. LNA – The LNA (low noise ampliﬁ er) ampliﬁ es the uplink RF signals after they pass through the duplexer. A low noise ampliﬁ er with 40dB of gain provides a low noise ﬁ gure.2. Power Amp – The output power ampliﬁ er pro-vides the downlink gain and has some additional features like ALC (automatic level control) and pre-distortion.The ampliﬁ ers that Fiber-Span utilizes are powered from a DC power supply. The RF ampliﬁ ers are type AB broadband. Their current varies with their RF power load. The power ampliﬁ ers employ an Automatic Level Con-trol (ALC) circuit to ensure the RF output power does not destroy the ﬁ nal gain stage of the RF ampliﬁ er. The input signal to the power ampliﬁ er can be reduced to prevent the ALC circuit from becoming active. This is done by adjusting the Attenuator control available on the GUI Interface.The ampliﬁ ers also employ a form of pre-distortion to allow multiple channels to operate at higher levels with reduced intermodulation signal levels. The input RF signal into the ampliﬁ er is pre-distorted such that after ampliﬁ cation, the intermodulation prod-ucts are reduced from what would normally be experi-enced in an ampliﬁ er without pre-distortion.When Power Ampliﬁ er (PA) input exceeds ALC range, the power ampliﬁ er latches in MUTE mode, meaning the PA is OFF, to protect itself from destructive damage. This state requires technical intervention in order to return the PA to the UNMUTED state:1. Correct the cause of high level input. This can be done by performing the following: a. Discover and mitigate any input signal(s) causing the over-driven state b. Reduce gain to an appropriate level 2. Using the GUI, MUTE the PA 3. Using the GUI, UNMUTE the PAwidths etc. and getting alarms in the DHRU. Also provides a single contact closure summary alarm via the circular connector.5. Power Supply - This unit converts AC Primary Power to DC Power as required by the active components.6. GUI-based Monitor & Control Interface - This subsystem offers signiﬁ cant user beneﬁ ts and capabilities. This utility allows the user to optimize the equip-ment conﬁ guration settings and monitor Alarm Status.

FS71C-85 Series User Manual| 9Copyright © 2015 Fiber-SpanThe duplexers used in the HRU perform two speciﬁ c functions:1. Provide adequate isolation between the downlink and uplink frequency bands to prevent oscillation; and2. Provide a suitable bandpass characteristic to pre-vent unwanted interference from/to other donor sites in the area.The amount of isolation required depends on the over-all gain of both the downlink and uplink ampliﬁ ers. As the gain increases, so does the isolation requirement and the size of the duplexers.DuplexersFiber-Span provides duplexers that match the existing frequency bands in use. In the 800MHz SMR spectrum, the downlink and uplink frequency bands are 45MHz apart. The frequency bands are as follows:800 MHz HRU Frequency Arrangem entsPassband Spectrum3 MHz 821-824MHz / 866-869MHz15 MHz 806-821MHz / 851-866MHz18 MHz 806-824MHz / 851-869MHzAlarmsThe alarms inside the DHRU utilizes a dry contact relay that is normally closed when there are no alarms. The following alarm conditions will cause the summarydry contact relay to open: 1. Power Amp Failure - When the PA current falls below its designated threshold level, an alarm is triggered.2. Door Open – When the door is opened, a switch is activated that triggers an alarm. Wall mount only.3. Power Supply – When there is no voltage at the power supply, the summary alarm is triggered.A logical summary output of these alarms is connected to an 8-pin male Switchcraft connector on the bottom of the DHRU. The pin-out of the male Switchcraft connector is shown in Figure 7. When there is an alarm condition, there is an open circuit between pins 1 and 2. This is a Summary Alarmindication for any alarm event/condition in the DHRU.Figure 7: Alarm Connector Pin-outAlarm Connector PinoutPin Desc. Function1N.C. Local Summary Alarm2COM3 -4 -5 -6 -7 -8 -Dry Contact Normally Closed When Status is OK

FS71C-85 Series User Manual | 10Copyright © 2015 Fiber-SpanFigure 8: DHRU Settings and Alarms Status GUI InterfaceGUI InterfaceA GUI Interface is available for use in DHRU setup and conﬁ guration management. This includes initial con-ﬁ guration of channel frequencies and ﬁ lter bandwidths, a well as Alarm Monitoring and Control functions. The GUI software runs on a separate PC, which is con-nected to the DHRU via USB cable attached to the USB port on the front panel. The Alarms screen is shown in Figure 8below.The device interface is set up by choosing the COMport for communications and selecting a device name.• PA Current 1 (UpLink)• PA Current 2 (DownLink)• Power Supply VoltageLocalDiscrete reported Alarms are as follows:

FS71C-85 Series User Manual| 11Copyright © 2015 Fiber-SpanSpeci cationsRF Speci cationsFrequency Range 851-869 MHz (Downlink), 806-824 MHz (Uplink)Gain (typical) 120 dB, adjustable in 1dB steps over a 30dB rangeOIP3 63dBm (min)Noise Figure 7dBPower per Channel Refer to Derating TablePass Bandwidth 3MHz, 15MHz, 18MHzInput/Output VSWR < 2.0:1Spurious Emission (max) -20 dBmRF Connectors N-FemaleDimensions (WxHxD in.) 19.00 x 6.95h x 19.30 (Standard Rack-mount version)Weight (lbs) 45 lbs (Standard Rack-mount version)Mounting Method Rack-mount Enclosure (4U) Alarms (Dry Contact Closure or GUI Interface) 1. Summary Alarm normally open, closes upon any alarm within the unit. Pins 1 and 2. 2. GUI Alarms and ControlsMTBF 5 YearsElectrical ParametersPower Consumption 190 Watts (1 ampliﬁ er); 290 Watts (2 ampliﬁ ers)Primary Power AC Supply 115-230 VAC, 50/60 HzThe following tables detail the speciﬁ cations of the 800 MHz G-Series DHRU.

FS71C-85 Series User Manual | 12Copyright © 2015 Fiber-SpanOutline DrawingsFigure 9: Outline Drawing - Rack-mount ConfigurationDimensions for the Rack-mount conﬁ guration are as shown below.

FS71C-85 Series User Manual| 13Copyright © 2015 Fiber-SpanFigure 10: Outline Drawing - Wall-mount ConfigurationTypical Mounting Points (4)

FS71C-85 Series User Manual | 14Copyright © 2015 Fiber-Span4Installation ProcedureEnvironmentFiber-Span’s DHRU is designed to operate in a con-trolled environment such as a Telecom room. It is recommended that the temperature inside the room ConnectorizationThe DHRU is supplied with N-female connectors on all RF ports. It is highly recommended that 3 ft. ﬂ exible jumper cables such as LMR240 be used to connect the DHRU to the larger hard-line coaxial cable, otherwise the strain on the DHRU’s RF ports may result in a dam-aged connector.If the DHRU is being used as a simple BDA and the downlink port and uplink port are unused, it is recom-mended that these ports be terminated with a 50Ω load.NOTE: If DAS Port is NOT used, it MUST be terminated with a 50 Ω load capable of handling 20 Watts.The Alarm port uses an 8-pin male Switchcraft connec-tor and is shown below. The female connector (Switch-craft part # EN3C8FX) kit is included with the DHRU.AlarmsWall-mount VersionBolts of adequate strength are required to mount the wall-mount HRU which weighs approx. 70lbs with dimensions 16”x14”x9”. A total of four (4) bolts are needed to mount the DHRU to the wall. The bolt patterns for the DHRUs are shown in the Outline Drawing. See Figure 10 for example. Anchoringdoes not exceed +50°C and does not drop below -5°C. The humidity must be 10% to 95%.Alarm Connector PinoutPin Desc. Function1N.C. Local Summary Alarm2COM3 -4 -5 -6 -7 -8 -Dry Contact Normally Closed When Status is OKRack-mount VersionInstall the rack-mount DHRU on an EIA standard 19” rack using four 10-32 x ¾” screw with Captive Cup washer (Anixter PN 231157 or equivalent). Weight with 2 power ampliﬁ ers is 44 lbs.

FS71C-85 Series User Manual| 15Copyright © 2015 Fiber-SpanThe DHRU comes with a grounding lug. A grounding wire of suitable gauge must be used to ground to a common bus bar in the Telecom room according to lo-cal and building regulations.An illustration of the ground lug is shown below for both the wall-mount and rack-mount versions.GroundingGrounding LugGrounding Lug at Rear of Rack-mount ChassisGrounding LugGrounding Lug at Bottom of Wall-mount ChassisNote that the AC power inlet housing at the rear of the Rack-mount chassis contains two in-line slow-blow type fuses (Digi-key P/N F2420-ND).

FS71C-85 Series User Manual | 16Copyright © 2015 Fiber-Span5Setup ProcedureOverviewBefore the unit can be connected to the DAS and powered on, the following cautionary notes must be observed.Strict adherence to these guidelines will ensure com-pliance with FCC mandated operational restrictions.Cautionary NotesWARNING: Before powering the unit on, it is imperative to measure the downlink composite power level at the Antenna port. When connecting directly to an antenna, the maximum downlink antenna gain must not exceed 4.85 dBd and the cable loss from DAS port to antenna must not be less than 5 dB. The maximum uplink an-tenna gain must not exceed -2.15 dBd. WARNING: All RF ports must be properly terminated prior to applying power to these units. Unused RF ports should be terminated with 50 ohms. Failure to properly terminate an RF port may result in damage to the unit.All output ports must be terminated with a 50Ω load capable of handling 20W of power before the HRU is powered on. Alternatively, the HRU can be connected to the in-building system assuming the connections are 50Ω with acceptable VSWR (<2.0:1). This will prevent damage to the unit.Electrostatic Discharge ESD Use caution when touch-ing equipment. Make sure your body has been statically discharged by grounding yourself via an ESD grounding strap. This will prevent damage to sensitive compo-nents inside the unit.WARNING: For DHRUs equipped with fans, make sure that the fans are not blocked, thereby allowing heat en-ergy to escape the enclosure. An DHRU with a blocked fan will exhibit a much lower MTBF.Contents of PackageWith the purchase of any DHRU the following are included when shipped:• DHRU Product• DHRU User Manual• Test Data Sheet showing factory set levels• Outline Drawing• Mating Circular Alarm ConnectorAdditionally, the following items are recommended for Setup and operation:• Laptop PC• 6 ft. cable, USB-A to USB-BDHRU GUI SoftwareThe DHRU software sets all key operational parameters. See Fig 12 for the Alarm / Control Screen: Alarm / Control Settings• Supply Voltage Alarm• Power Ampliﬁ er 1 (Uplink) Current Alarm• Power Ampliﬁ er 2 (Downlink) Current Alarm• Power Ampliﬁ er 1 (Uplink) Output Set (Mute)• Power Ampliﬁ er 2 (Uplink) Output Set (Mute)Diagnostics• RF Power Ampliﬁ er 1 (UL) Current value (mA)• RF PA1 FWD and REV power detector (dBm)• RF Power Ampliﬁ er 2 (DL) Current value (mA)• RF PA2 FWD and REV power detector (dBm)

FS71C-85 Series User Manual| 17Copyright © 2015 Fiber-SpanFigure 12: DHRU Alarm & Control GUI InterfaceFigure 11: DHRU Signal Paths and AttenuatorsFigure 11 illustrates the internal DHRU functional block diagram.

FS71C-85 Series User Manual | 18Copyright © 2015 Fiber-SpanDownlink SetupTo setup the downlink, the following equipment is required:1. RF signal generator2. Spectrum analyzer3. Appropriate jumper cablesThe following steps should be observed to properly set up the link. At the Antenna Port, measure the composite RF signal level delivered by the signal generator (or donor an-tenna when in the ﬁ eld).Use a suitable Spectrum Analyzer capable of measuring composite RF within the required bandwidth. The best way to measure the composite signal level is to setup the Spectrum Analyzer to measure the total carrier power within the bandwidth of the downlink ampliﬁ er. Carrier level is not the same as composite power over the bandwidth. 1. Enable a channel in the GUI by setting the test fre-quency and enabling the channel and ticking the AGC column. Set BW to 25kHz, Gain adjust to 0dB and set Squelch to -90 dBm, 2. Ensure that the measured composite RF signal lev-el at the RF input port is no greater than -10dBm.3. At the output Antenna Port, measure the composite RF4. Set gain such that output is approximately +37 dBm (or one channel) by setting the Gain adjust levels in the Downlink GUI page. 5. Measure and verify that the composite RF output power at the DAS port is approximately +37dBm.6. Note: Factory limit is set to +37 dBm composite output power7. For a two tone test, repeat steps 1 - 4 for a second frequency. Reduce the output level per the derat-ing on page 20NOTE: The derating table applies only when the test tones are random (e.g. off air signals) . If test tones are generated by test equipmnet, be sure the two genera-tors do not use a common synchronized clock source. Non-random synchronized signals would require a much more accelerated derating. NOTE: When connecting directly to an antenna, the maximum downlink antenna gain must not exceed 4.85 dBd and the cable loss from DAS port to antenna must not be less than 5 dB. The maximum uplink antenna gain must not exceed -2.15 dBd.

FS71C-85 Series User Manual| 19Copyright © 2015 Fiber-SpanFigure 13: Downlink Control GUI InterfaceThe HRU Downlink Control shown above gives the user the ability to optimize the Gain setting in the Downlink path. Note: Uplink & Downlink’s Bandwidth is factory set per customer’s speciﬁ cations.

FS71C-85 Series User Manual | 20Copyright © 2015 Fiber-SpanDe-rating TableAfter the downlink gain and the output composite pow-er are set, the power-per-channel must be measured to ensure that the downlink signal level is a high enough at the RF Output port and is sufﬁ cient to provide the desired coverage.The table at right summarizes the power-per-channel de-rating requirements for FM type modulation schemes.HRU Derating TableNo. of RF Channels Power per Channel (FM), (dBm)137234431828DHRU Uplink ControlThe DHRU Uplink control and monitoring gives the user the ability to change the gain and set parameters for uplink path optimization. The settings and diagnostics can be implemented via the local USB port. See Figure 14.

FS71C-85 Series User Manual| 21Copyright © 2015 Fiber-SpanUplink Gain SetupTo set up the uplink, the following equipment is re-quired:1. RF Signal Generator2. Spectrum Analyzer3. Appropriate jumper cablesThe following steps should be observed to proper set up the link.1. Using your design link budget, calculate the maximum RF Input the HRU would receive on the DAS port. Factor ALL Channels within band of the HRU at the lowest path loss. The maximum input power should be less than -10 dBm. If this calculated value exceeds -10 dBm, add additional attenuation to the DAS port.a. 800 MHz Free-Space Path Loss at 1 meter = approximately 30 dBb. Antenna Network Loss should be about 20 dB (sum of losses from any antenna, over the coax, and through all passive devices)c. Composite power can be calculated using 10 LOG10 (n) where n = number of channels supported.2. Set Signal Generator to generate a CW Signal within the Uplink band at an amplitude equal to the value calculated above. Use this generated signal as the input for gain measurement and veriﬁ cation.3. Set gain such that output = +37 dBm by increasing or decreasing the UPLINK ATTENUATOR in the GUI. Uplink Bandwidth is factory set per customer’s speciﬁ cations.4. Measure and verify that the composite RF output power at the DONOR port is approximately +37dBm. Note: Factory limit is set to +37 dBm composite output power. When connecting directly to an antenna the maximum uplink antenna gain must not exceed -2.15 dBd. Figure 14: Uplink Control GUI Interface

FS71C-85 Series User Manual | 22Copyright © 2015 Fiber-Span6TroubleshootingDHRU AlarmsDHRU alarms are anunciated with red “LED” indicators in the Graphical User Interface. See ﬁ gure 15 below.Figure 15. Alarm Status Indicators - GUI Interface

FS71C-85 Series User Manual| 23Copyright © 2015 Fiber-Span1. POWER AMP CURRENT - Uplink or DownlinkThe POWER AMP CURRENT Alarm is triggered when the power ampliﬁ er current draw exceeds the thresh-old. This could occur when:• PA ALC Failure causes RF Output Power to exceed +37 dBm• Internal component failure(s) within the PATroubleshooting Steps:a. Using a Spectrum Analyzer or Power Meter and appropriate protective Power-Rated Attenuator(s), measure the RF Output Port for the alarmed PA (DAS Port for Downlink, Donor Port for Uplink). Be sure to account for the protective attenuator(s) in determining output power.b. If the output power is in excess of +37 dBm, note the value and contact manufacturer Technical Support. The HRU should be switched OFF to prevent potential further damage.2. SUPPLY VOLTAGEThe SUPPLY VOLTAGE Alarm is triggered when the unit’s internal power supply voltage exceeds the high voltage threshold or drops below the low voltage threshold. Troubleshooting Steps:a. Check the source power cable’s connection to the HRU and verify all connections are properly seated.b. Using a Multi-meter, verify the electrical power source (outlet) is within the voltage requirements of the HRU’s speciﬁ cation sheet. The HRU should be removed from the power source to do this. Note the measured voltage.c. Plug the HRU into the power source, switch it on, and re-check the SUPPLY VOLTAGE Alarm status again.d. If the alarm returns, contact manufacturer Technical Support. The HRU should be switched off to prevent further potential damage. The DHRU software sets all key operational parameters. See Fig 15 for the Alarm / Control Screen: Alarm / Control Settings• Supply Voltage Alarm• Power Ampliﬁ er 1 (Uplink) Current Alarm• Power Ampliﬁ er 2 (Downlink) Current Alarm• Power Ampliﬁ er 1 (Uplink) Output Set (Mute)• Power Ampliﬁ er 2 (Uplink) Output Set (Mute)Diagnostics• RF Power Ampliﬁ er 1 (UL) Current value (mA)• RF PA1 FWD and REV power detector (dBm)• RF Power Ampliﬁ er 2 (DL) Current value (mA)• RF PA2 FWD and REV power detector (dBm)

FS71C-85 Series User Manual | 24Copyright © 2015 Fiber-Span7Warranty InformationGeneral WarrantyThe product carries a standard warranty period of one (1) year unless otherwise indicated on the shipping packages as noted in the purchase order agreement.Limitations of WarrantyThe warranty is limited to the repair or replacement of the defective product. Fiber-Span will decide which remedy to provide for defective components at its own discretion. Fiber-Span shall have a reasonable time af-ter determining that a defective product exists to repair or replace the problem unit. The warranty applies to repair or replaced products for the balance of the applicable period of the original warranty or ninety (90) days from date of shipment of a repaired or replaced component, whichever is longer.The Fiber-Span standard warranty does not cover prod-ucts which have been received improperly packaged, altered, or physically damaged. For example, broken warranty seal, labels exhibiting tampering, physically abused enclosure, broken pins on connectors, any modi-ﬁ cations made without Fiber-Span authorization, will void all warranty.Limitations of DamagesThe liability for any defective product shall in no event exceed the purchase price for the defective product. Fiber-Span has no liability for general, consequential, incidental or special damages.Return Material Authorization (RMA)No product may be returned directly to Fiber-Span without ﬁ rst obtaining approval from Fiber-Span. If it is determined that the product may be defective, you will be given an RMA number and instructions on how to return the product. An unauthorized return, i.e., one for which an RMA number has not been issued, will be returned to you at your expense. Authorized returns are to be shipped to the address on the RMA in an approved shipping container. It is suggested that the original box and packaging materials should be kept if a defective product needs to be shipped back to Fiber-Span.To request an RMA, please call Fiber-Span at 908.253.9080.

FS71C-85 Series User Manual| 25Copyright © 2015 Fiber-Span“Changes or modiﬁ cations not expressly approved by the manufacturer could “Void” the user’s authority to operate the equipment”.This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interfer-ence when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions manual, may cause 8FCC Statementharmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at their own expense.The maximum downlink antenna gain must not exceed 4.85 dBd and the cable loss from DAS port to antenna must not be less than 5 dB. The maximum uplink antenna gain must not exceed -2.15 dBd. The antenna(s)used for this device must be installed to provide a sep- aration distance of at least 100 cm from nearby persons.Manufacturer’s NotesTo improve and/or correct equipment performance the following can be performed.1. Re-orient or relocate the receiving antenna.2. Increase the separation between the equipment and receiver.3. Connect the equipment into an outlet on a dif-ferent circuit from that to which the receiver is connected.4. Consult the dealer or an experienced radio/RF technician for help.

FS71C-85 Series User Manual | 26Copyright © 2015 Fiber-SpanFiber-Span, 3434 Route 22 West - Branchburg, NJ 08876 - 908•253•9080, fax 908•253•9086 - www.fiber-span.com

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