Fiber-Span FS71C-85-USR User Operation & Maintenance Manual

Download

FS71C-85 Series User Manual

| I

FS71C-85-USR

User Operation & Maintenance Manual

800 MHz Digital Narrowband Repeater Unit

Fiber-Span, 3434 Route 22 West - Branchburg, NJ 08876 - 908•253•9080, fax 908•273•9086 - www.fiber-span.com

FS71C-85 Series User Manual | II

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-Span

3434 Route 22 W., Suite 140

Branchburg, New Jersey 08876

Tel: (908) 253-9080

Fax: (908) 253-9086

www.ﬁ ber-span.com

Limitation of Liability

FS71C-85 Series User Manual

| III

Warnings

Only 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 statement 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 Boosters

THIS 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 penalties in excess of $100,000 for each continuing violation.”

FS71C-85 Series User Manual | IV

Revision History

Version Description Date Author

1.0 Initial Release 01-Aug-2014 DT

1.1 GUI Screen shots and descriptions updated 01-Feb-2015 HW

1.1a pg18 DL Setup 25-Feb-2015 HW

1.1k FCC statement clariﬁ ed 10-Aug-2015 HW

Information in this document is subject to change without notice.

Please send comments to:

E-mail: techinfo@Fiber-Span.com

Phone: 908-253-9080 | Fax: 908-253-9086

FS71C-85 Series User Manual

| V

Table of Contents

Limitation of Liability . . . . . . . . . . . . . . . ii

Warnings . . . . . . . . . . . . . . . . . . . . iii

Revision History . . . . . . . . . . . . . . . . . iv

1 Company Information 1

Contact . . . . . . . . . . . . . . . . . . . . 1

2 Product Introduction 2

Theory of Operation . . . . . . . . . . . . . . . 4

Product Applications . . . . . . . . . . . . . . . 5

3 Detailed Description 8

Overview . . . . . . . . . . . . . . . . . . . . 8

Amplifiers . . . . . . . . . . . . . . . . . . . . 8

Duplexers . . . . . . . . . . . . . . . . . . . . 9

Alarms . . . . . . . . . . . . . . . . . . . . . 9

GUI Interface . . . . . . . . . . . . . . . . . . .10

Specifications . . . . . . . . . . . . . . . . . .11

Outline Drawings . . . . . . . . . . . . . . . . .12

4 Installation Procedure 14

Environment . . . . . . . . . . . . . . . . . . .14

Connectorization . . . . . . . . . . . . . . . . .14

Anchoring . . . . . . . . . . . . . . . . . . . .14

Wall-mount Version. . . . . . . . . . . . . . .14

Rack-mount Version. . . . . . . . . . . . . . .14

Alarms . . . . . . . . . . . . . . . . . . . .14

Grounding . . . . . . . . . . . . . . . . . . . .15

FS71C-85 Series User Manual | VI

5 Setup Procedure 16

Overview . . . . . . . . . . . . . . . . . . . .16

Cautionary Notes . . . . . . . . . . . . . . . . .16

Contents of Package. . . . . . . . . . . . . . . .16

HRU Control . . . . . . . . . . . . . . . . . . .16

Downlink Setup. . . . . . . . . . . . . . . . . .18

De-rating Table . . . . . . . . . . . . . . . . . .20

HRU Uplink Control . . . . . . . . . . . . . . . .20

Uplink Gain Setup. . . . . . . . . . . . . . . . .21

6 Troubleshooting 22

HRU Alarms . . . . . . . . . . . . . . . . . . .22

Power LED Indicator . . . . . . . . . . . . . . . .23

Amplifier Alarms . . . . . . . . . . . . . . . . .23

Fan Blockage. . . . . . . . . . . . . . . . . . .23

Door Lights . . . . . . . . . . . . . . . . . . .23

7 Warranty Information 24

General Warranty . . . . . . . . . . . . . . . . .24

Limitations of Warranty . . . . . . . . . . . . . .24

Limitations of Damages . . . . . . . . . . . . . .24

Return Material Authorization (RMA) . . . . . . . . .24

8 FCC Statement 25

Manufacturer’s Notes . . . . . . . . . . . . . . .25

Table of Contents (cont’d)

FS71C-85 Series User Manual

| 1

Company Information

Fiber-Span is a premier provider of advanced RF ON FIBER® technologies and solutions for ﬁ ber optic based transmission of high performance radio-frequency wireless voice, data and multiservice networking applications.

Fiber-Span offers a full line of ﬁ bered and non-ﬁ bered wireless coverage solutions including Distributed Antenna Systems, Bidirectional Ampliﬁ ers, Digital Narrowband DSP based Repeaters and ﬁ ber optic distribution gear. Full featured solutions include redundancy, Network Management Systems and remote web-based access capability.

Fiber-Span is addressing public safety needs by providing 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 convergence 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 communication 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.

Contact

Fiber-Span

3434 Rt. 22W, Suite 140

Branchburg, NJ 08876

908-253-9080

Email: techinfo@ﬁ ber-span.com

Web: http://www.ﬁ ber-span.com

FS71C-85 Series User Manual | 2

Product Introduction

This 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 optionally, 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 Family

DHRU - Digital Headend Repeater Unit IHU - Integrated Headend Repeater Unit BSU - Base Station Interface Unit FTU - Fiber Transceiver Unit RRU - Remote Repeater Unit

CRRU - Compact Remote Repeater Unit BTS - Base Transceiver System GPS - Global Positioning System

FS71C-85 Series User Manual

| 3

The 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 combined 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 | 4

Theory 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 output 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 intermodulation 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 ampliﬁ 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

| 5

Product Applications

The 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 coverage solution for a single band of wireless service

Figure 4. Typical DHRU RF Amplification System (Simplified)

Indoor Antennas

Broadband RF Splitter

Coaxial Cable

Directional

Antenna

HRU

Antenna Port

DAS Port

Donor Site

FS71C-85 Series User Manual | 6

Figure 5. Typical HRU Multi-Service Signal Distribution System

Indoor Antennas

Broadband RF Splitter

Coaxial Cable

Directional

Antenna

Base Station Interface Unit

Donor Site

BSU

HRU HRUHRU

FS71C-85 Series User Manual

| 7

Figure 6. Typical DHRU-to-Multiple RRU Signal Distribution System

Antenna

Port

DAS Port

Downlink Port

Uplink Port

AC Power

FTU

HRU

Fiber-Optic

Transceiver

Unit

To DAS

Amp

Power Supply

RRU

FS71C-85 Series User Manual | 8

Detailed Description

This section deals with the actual components that are assembled to make up the DHRU. The main subassemblies/subsystems are:

1. RF Ampliﬁ ers - These provide RF signal ampliﬁ cation.

2. Duplexers - These units separate and combine downlink and uplink frequency spectra, and reduce interference.

3. Digital Signal Processor - Provides settable narrowband ﬁ lters around eacch incoming channel.

4. Control Board - Provides the USB interface for GUI Program for setting channel centers, ﬁ lter band-

Overview

Ampli ers

There 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 provides 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 Control (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 products are reduced from what would normally be experienced 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 PA

widths 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 equipment conﬁ guration settings and monitor Alarm Status.

FS71C-85 Series User Manual

| 9

The duplexers used in the HRU perform two speciﬁ c functions:

1. Provide adequate isolation between the downlink and uplink frequency bands to prevent oscillation; and

2. Provide a suitable bandpass characteristic to prevent unwanted interference from/to other donor sites in the area.

The amount of isolation required depends on the overall gain of both the downlink and uplink ampliﬁ ers. As the gain increases, so does the isolation requirement and the size of the duplexers.

Duplexers

Fiber-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 M Hz HRU Frequency Arrangem ents

Passband Spectrum

3 MHz 821-824MHz / 866-869MHz

15 MHz 806-821MHz / 851-866MHz

18 MHz 806-824MHz / 851-869MHz

Alarms

The 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 summary dry 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 Alarm indication for any alarm event/condition in the DHRU.

Figure 7: Alarm Connector Pin-out

Alarm Connector

Pinout

Pin Desc. Function

1 N.C.

Local Summary

Alarm

2 COM

3 -

4 -

5 -

6 -

7 -

8 -

Dry Contact Normally Closed

When Status is OK

FS71C-85 Series User Manual | 10

Figure 8: DHRU Settings and Alarms Status GUI Interface

GUI Interface

A GUI Interface is available for use in DHRU setup and conﬁ guration management. This includes initial conﬁ 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 8 below.

The device interface is set up by choosing the COM port for communications and selecting a device name.

• PA Current 1 (UpLink)

• PA Current 2 (DownLink)

• Power Supply Voltage

Local

Discrete reported Alarms are as follows:

FS71C-85 Series User Manual

| 11

Speci cations

RF Speci cations

Frequency Range 851-869 MHz (Downlink), 806-824 MHz (Uplink)

Gain (typical) 120 dB, adjustable in 1dB steps over a 30dB range

OIP3 63dBm (min)

Noise Figure 7dB

Power per Channel Refer to Derating Table

Pass Bandwidth 3MHz, 15MHz, 18MHz

Input/Output VSWR < 2.0:1

Spurious Emission (max) -20 dBm

RF Connectors N-Female

Dimensions (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 Controls

MTBF 5 Years

Electrical Parameters

Power Consumption 190 Watts (1 ampliﬁ er); 290 Watts (2 ampliﬁ ers)

Primary Power AC Supply 115-230 VAC, 50/60 Hz

The following tables detail the speciﬁ cations of the 800 MHz G-Series DHRU.

FS71C-85 Series User Manual | 12

Outline Drawings

Figure 9: Outline Drawing - Rack-mount Configuration

Dimensions for the Rack-mount conﬁ guration are as shown below.

FS71C-85 Series User Manual

| 13

Figure 10: Outline Drawing - Wall-mount Configuration

Typical M ounting

Points (4)

FS71C-85 Series User Manual | 14

Installation Procedure

Environment

Fiber-Span’s DHRU is designed to operate in a controlled environment such as a Telecom room. It is recommended that the temperature inside the room

Connectorization

The 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 damaged connector.

If the DHRU is being used as a simple BDA and the downlink port and uplink port are unused, it is recommended 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 connector and is shown below. The female connector (Switchcraft part # EN3C8FX) kit is included with the DHRU.

Alarms

Wall-mount Version

Bolts 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.

Anchoring

does not exceed +50°C and does not drop below -5°C. The humidity must be 10% to 95%.

Alarm Connector

Pinout

Pin Desc. Function

1 N.C.

Local Summary

Alarm

2 COM

3 -

4 -

5 -

6 -

7 -

8 -

Dry Contact Normally Closed

When Status is OK

Rack-mount Version

Install 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

| 15

The 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 local and building regulations.

An illustration of the ground lug is shown below for both the wall-mount and rack-mount versions.

Grounding

Lug

Grounding Lug at Rear of Rack-mount Chassis

Grounding

Lug

Grounding Lug at Bottom of Wall-mount Chassis

Note 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 | 16

Setup Procedure

Overview

Before 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 compliance with FCC mandated operational restrictions.

Cautionary Notes

WARNING: 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 antenna 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 components inside the unit.

WARNING: For DHRUs equipped with fans, make sure

that the fans are not blocked, thereby allowing heat energy to escape the enclosure. An DHRU with a blocked fan will exhibit a much lower MTBF.

Contents of Package

With 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 Connector

Additionally, the following items are recommended for Setup and operation:

• Laptop PC

• 6 ft. cable, USB-A to USB-B

DHRU GUI Software

The 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

| 17

Figure 12: DHRU Alarm & Control GUI Interface

Figure 11: DHRU Signal Paths and Attenuators

Figure 11 illustrates the internal DHRU functional block diagram.

FS71C-85 Series User Manual | 18

Downlink Setup

To setup the downlink, the following equipment is required:

1. RF signal generator

2. Spectrum analyzer

3. Appropriate jumper cables

The 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 antenna 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 frequency 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 level at the RF input port is no greater than -10dBm.

3. At the output Antenna Port, measure the composite RF

4. 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 power

7. For a two tone test, repeat steps 1 - 4 for a second frequency. Reduce the output level per the derating on page 20

NOTE: 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 generators 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

| 19

Figure 13: Downlink Control GUI Interface

The 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 | 20

De-rating Table

After the downlink gain and the output composite power 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 Table

No. of RF Channels Power per Channel (FM), (dBm)

1 37

2 34

4 31

8 28

DHRU Uplink Control

The 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

| 21

Uplink Gain Setup

To set up the uplink, the following equipment is required:

1. RF Signal Generator

2. Spectrum Analyzer

3. Appropriate jumper cables

The 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 dB

b. 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 | 22

Troubleshooting

DHRU Alarms

DHRU 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

| 23

1. POWER AMP CURRENT - Uplink or Downlink

The POWER AMP CURRENT Alarm is triggered when the power ampliﬁ er current draw exceeds the threshold. This could occur when:

• PA ALC Failure causes RF Output Power to exceed +37 dBm

• Internal component failure(s) within the PA

Troubleshooting 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 VOLTAGE

The 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 | 24

Warranty Information

General Warranty

The 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 Warranty

The 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 after 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 products 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 modiﬁ cations made without Fiber-Span authorization, will void all warranty.

Limitations of Damages

The 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

| 25

“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 interference 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

FCC Statement

harmful 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 Notes

To 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 different 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 | 26

Fiber-Span, 3434 Route 22 West - Branchburg, NJ 08876 - 908•253•9080, fax 908•253•9086 - www.fiber-span.com

Fiber-Span FS71C-85-USR User Operation & Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual