ADC Digivance User manual

ADCP-75-110
Issue 2B
July 2001
Digivance™
800/1900 MHz Indoor Coverage Solution
Installation and Operation Manual
DRAFT
1175170 Rev A
FCC ID: F8I-DVICS1900-1

ADCP-75-110 •Issue 2B •July 2001
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COPYRIGHT
 2001, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
ISSUE DATE REASON FOR CHANGE
Issue 1 04/2001 Original
Issue 2 06/2001 Changes in LED operation, new power cable maximum length recommendations, and update to
specifications table
Issue 2B 07/2001 Updated to cover 1900 MHz version of product
TRADEMARK INFORMATION
ADC and FiberGuide are registered trademarks of ADC Telecommunications, Inc.
Digivance is a trademark of ADC Telecommunications, Inc.
LC is a trademark of Lucent Technologies Inc.
TORX is a registered trademark of Textron, Inc.
DISCLAIMER OF LIABILITY
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no
event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits and ADC further
disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of
liability applies to all products, publications and services during and after the warranty period.
This publication may be verified at any time by contacting ADC’s Technical Assistance Center at 1-800-366-3891, extension
63475 (in U.S.A. or Canada) or 952-946-3475 (outside U.S.A. and Canada), or by e-mail to [e-mail].
ADC Telecommunications, Inc.
P.O. Box 1101, Minneapolis, Minnesota 55440-1101
In U.S.A. and Canada: 1-800-366-3891
Outside U.S.A. and Canada: [phone]
Fax: [phone]

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TABLE OF CONTENTS
Content Page
1 SYSTEM FUNCTIONAL OVERVIEW AND UNIT DESCRIPTIONS ........................................ 1
1.1 System Functional Overview ....................................................... 1
1.2 Digital Host Unit Description ....................................................... 3
1.3 Digital Remote Unit Description ..................................................... 7
1.4 Digital Expansion Unit Description ................................................... 9
1.5 Terms and Definitions............................................................12
1.6 Specifications .................................................................13
2 INSTALLATION PLANNING AND SYSTEM DESIGN................................................16
2.1 Base Station Interface Requirements..................................................16
2.2 Locating and Mounting Requirements .................................................18
2.3 Powering Requirements ..........................................................19
2.4 Optical Options and Requirements ...................................................20
2.5 Coaxial Cable Requirements .......................................................20
2.6 System Expansion Planning........................................................20
2.7 DRU Antenna Options ............................................................21
2.8 External Alarm System Reporting Requirements ..........................................23
2.9 Frequency Band Selection Requirements (1900 Mhz) ......................................23
2.10 Maintenance Requirements........................................................24
2.11 System Design Recommendations ...................................................24
3 DIGITAL HOST UNIT INSTALLATION PROCEDURE................................................27
3.1 System Plan Review and Pre-Installation Cable Routing .....................................27
3.2 Tools and Materials .............................................................27
3.3 Unpacking and Inspection .........................................................28
3.4 Frequency Band Selection Procedure (1900 Mhz DHU Only) .................................28
3.5 Mounting Procecure ............................................................29
3.6 Chassis Ground Procedure.........................................................32
3.7 Coaxial Cable Connections ........................................................33
3.8 Ports 1–6 OpticalConnections ......................................................34
3.9 DC Power Connections ...........................................................35
3.10 Exterma; Alarm System Connections ..................................................37
3.11 AC Power Connections ...........................................................38
3.12 Create As-Built Drawing ..........................................................39
4 SYSTEM OPERATION ..................................................................40
4.1 Tools and Materials .............................................................40
4.2 Turn-Up System and Verify Operation .................................................40
4.3 Correct Installation Problems.......................................................43
4.4 Test System Performance .........................................................45
5 SYSTEM MAINTENANCE PROCEDURES ......................................................46
5.1 Tools and Materials .............................................................46
5.2 Fault Detection and Alarm Reporting..................................................46
(continued)

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TABLE OF CONTENTS
Content Page
5.3 Fault Isolation and Troubleshooting.................................................. 47
5.4 Test Procedures ............................................................... 50
5.5 DHU or DEU Fan Replacement...................................................... 54
6 GENERAL INFORMATION ............................................................... 57
6.1 Warranty/Software ............................................................. 57
6.2 Software Service Agreement....................................................... 57
6.3 Repair/Exchange Policy .......................................................... 57
6.4 Repair Charges................................................................ 57
6.5 Replacement/Spare Products ...................................................... 58
6.6 Returned Material.............................................................. 58
6.7 Customer Information and Assistance................................................. 58

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ABOUT THIS GUIDE
This installation and operation manual provides the following information:
• An overview of the Digivance Indoor Coverage Solution (ICS) and a description of the
basic system components including the Digital Host Unit (DHU), Digital Expansion Unit
(DEU), and the Digital Remote Unit (DRU).
• System requirements for planning the Digivance ICS installation.
• Procedures for installing the DHU.
• Procedures for operating and maintaining the Digivance ICS.
• Product warranty, repair, return, and replacement information
The procedures for installing the DEU and DRU are provided in other publications which are
referenced in the Related Publications section and at appropriate points within this manual.
RELATED PUBLICATIONS
Listed below are related manuals and their publication numbers. Copies of these publications
can be ordered by contacting the ADC Technical Assistance Center at 1-800-366-3891
(in U.S.A. or Canada) or 952-946-3000, extension 63475 (outside U.S.A. and Canada).
Title/Description ADCP Number
Digivance ICS Digital Expansion Unit Installation Instructions 75-111
Provides a description of the DEU and procedures for installing the DEU.
Digivance ICS Digital Remote Unit Installation Instructions 75-112
Provides a description of the DRU and procedures for installing the DRU.
Digivance ICS Local Interface Unit User Manual 75-113
Provides a description of the LIU and procedures for installing the LIU.
Digivance ICS Remote Interface Unit User Manual 75-114
Provides a description of the RIU and procedures for installing the RIU.

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ADMONISHMENTS
Important safety admonishments are used throughout this manual to warn of possible hazards
to persons or equipment. An admonishment identifies a possible hazard and then explains
what may happen if the hazard is not avoided. The admonishments — in the form of Dangers,
Warnings, and Cautions — must be followed at all times. These warnings are flagged by use
of the triangular alert icon (seen below), and are listed in descending order of severity of injury
or damage and likelihood of occurrence.
Danger: Danger is used to indicate the presence of a hazard that will cause severe personal
injury, death, or substantial property damage if the hazard is not avoided.
Warning: Warning is used to indicate the presence of a hazard that can cause severe
personal injury, death, or substantial property damage if the hazard is not avoided.
Caution: Caution is used to indicate the presence of a hazard that will or can cause minor
personal injury or property damage if the hazard is not avoided.
GENERAL SAFETY PRECAUTIONS
The following general admonishments apply throughout the procedures in this manual.
Warning: Wet conditions increase the potential for receiving an electrical shock when
installing or using electrically-powered equipment. To prevent electrical shock, never install
or use electrical equipment in a wet location or during a lightning storm.
Warning: The DRU is powered by 48 VDC power which is supplied over customer-provided
wiring. To prevent electrical shock when installing or modifying the DRU power wiring,
disconnect the wiring at the power source before working with uninsulated wires or terminals.
Danger: This equipment uses a Class 1 Laser according to FDA/CDRH rules. Laser radiation
can seriously damage the retina of the eye. Do not look into the ends of any optical fiber. Do
not look directly into the optical adapters of any digital unit or exposure to laser radiation
may result. An optical power meter should be used to verify active fibers. A protective cap or
hood MUST be immediately placed over any radiating adapter or optical fiber connector to
avoid the potential of dangerous amounts of radiation exposure. This practice also prevents
dirt particles from entering the adapter or connector
Danger: Do not look into the ends of any optical fiber. Exposure to laser radiation may result. Do
not assume laser power is turned-off or the fiber is disconnected at the other end.
Danger: Always allow sufficient fiber length to permit routing without severe bends. Fibers
may be permanently damaged if bent/curved to a radius of less than 2 inches (50 mm).

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STANDARDS CERTIFICATION
FCC: This equipment complies with the applicable sections of Title 47 CFR Parts 15, 22, 24,
and 90.
UL/CUL: This equipment complies with UL and CUL 1950 Standard for Safety for
Information Technology Equipment, Including Electrical Business Equipment.
FDA/CDRH: This equipment uses a Class 1 LASER according to FDA/CDRH Rules. This
product conforms to all applicable standards of 21 CFR Part 1040.
LIST OF ACRONYMS AND ABBREVIATIONS
The acronyms and abbreviations used in this manual are detailed in the following list:
A Amperes
AC Alternating Current
AGC Automatic Gain Control
AMPS Advanced Mobile Phone Service
CDMA Code Division Multiple Access
CDRH Center for Devices and Radiological Health
CUL Canadian Underwriters Laboratories
DAS Distributed Antenna System
DC Direct Current
DEU Digital Expansion Unit
DHU Digital Host Unit
DRU Digital Remote Unit
EIA Electronic Industries Association
ERP Effective Radiated Power
ESD Electrostatic Discharge
FCC Federal Communications Commission
FDA Food and Drug Administration
ICS Indoor Coverage Solution
LIU Local Interface Unit
NOC Network Operations Center
PWR Power
RIU Remote Interface Unit
RF Radio Frequency
RSSI Received Signal Strength Indication
RX Receive or Receiver
TDMA Time Division Multiple Access
TX Transmit or Transmitter
UL Underwriters Laboratories
UPS Uninterruptible Power Supply
V Volts
VAC Volts Alternating Current
VDC Volts Direct Current
WECO Western Electric Company

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© 2001, ADC Telecommunications, Inc.
1 SYSTEM FUNCTIONAL OVERVIEW AND UNIT DESCRIPTION
This section provides an overview of the Digivance Indoor Coverage Solution (ICS), a
description of the functions and features provided by the units that comprise the system, a
listing of terms used and their definition, and a table of specifications.
1.1 System Functional Overview
The Digivance ICS is a digitally distributed antenna system that provides in-building coverage
for analog (AMPS) or digital (TDMA or CDMA) cellular phone systems operating within the
800 and 1900 MHz frequency bands. Large buildings typically interfere with the transmission
or reception of cellular phone system signals by imposing high attenuation losses on RF
signals. The Digivance ICS is designed to overcome the attenuation losses that make cellular
communications within buildings or structures difficult or impossible. With the Digivance
ICS, cellular phone RF signals can be distributed to the interior areas of any building or
structure to eliminate dead spots and improve reception.
1.1.1 Basic System Components
The basic components of the Digivance ICS and their functions are shown in Figure 1. The
basic system consists of the Digital Host Unit (DHU), Digital Remote Unit (DRU), and when
additional capacity or longer fiber runs are required, the Digital Expansion Unit (DEU). In
addition, two accessory items, the Local Interface Unit (LIU) and the Remote Interface Unit
(RIU) may be used as needed to interface the DHU with the cellular system Base Transceiver
Station (BTS).
1.1.2 Interface With BTS
The DHU interfaces, either locally or remotely, with the BTS. As referenced in this
publication, the BTS could be either a microcell or a cell site base station. When the BTS
(microcell) is co-located with the DHU, a local interface over coaxial cable is possible. An
interface device, such as the LIU, may be required to provide the proper input and output RF
signal levels between the BTS and the DHU. When the BTS (cell site base station) is not co-
located with the DHU, a remote interface using a donor antenna is required. An interface
device such as the RIU is required to provide the proper input and output RF signal levels
between the donor antenna and the DHU.
The DHU interfaces, as described in the preceding paragraph, with the BTS. In the forward
path, the DHU receives RF signals from the BTS. The DHU digitizes the RF signals and then
converts them to digital optical signals for transport to the DEUs and DRUs. In the reverse
path, the DHU receives digital optical signals from the DRUs and DEUs. The DHU converts
the optical signals back to the original RF signal format for transmission to the BTS.

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© 2001, ADC Telecommunications, Inc.
DRU
DRU
DRU
DRU
DRU
DRU
DRU
DRU
DRU
DRU
DRU
DEU
DEU
DHU
RIU
LIU
REMOTE
BTS
LOCAL
BTS
RF
16417-A
RF
Figure 1. System Overview Functional Block Diagram
1.1.3 Interface With Cellular Phones
The DRUs interface with the cellular phones. In the reverse path, the DRU receives RF signals
from each cellular phone. The DRU digitizes the RF signals and then converts them to digital
optical signals for transport to the DHU. In the forward path, the DRU receives digital optical
signals from the DHU. The DRU converts the optical signals back to the original RF signal
format for transmission to the cellular phones. A small antenna is connected to the DRU to
transmit and receive RF signals from the cellular phones.

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1.1.4 Digital Fiber Optic Transport
The DHU is connected to each DRU unit over a pair of multi-mode fiber optic links. One link
is used to transport the forward path optical signal. The other link is used to transport the
reverse path optical signal. Because the optical signal is digital, no adjustments to the optical
signal level are required at the DRU or the DHU regardless of the length of the optical link.
Either 50 or 62.5 micron core multi-mode fiber optic cable may be used for the optical link. If
50 micron cable is used, the optical link may be up to 750 meters in length. If 62.5 micron
core cable is used, the optical link may be up to 500 meters in length. The fiber optic links are
terminated with LC connectors.
1.1.5 Capacity for Expansion and Extended Runs
The DEU enables 6-way expansion of any optical port. This makes it possible to add more
DRUs without having to install additional DHUs. Each DHU is equipped with six optical
ports. If more than six DRUs are required by the application, a DEU may be connected to one
of the optical ports at the DHU which expands that port to six ports. If still more optical ports
are required, then a second DEU may be connected to the DHU or a second DEU may be
connected to the first DEU. The ability to cascade DEU’s in parallel or in series provides
unlimited flexibility. It is physically possible to connect an unlimited number DRUs to the
DHU through the installation of DEUs. The maximum number of DRUs that can connected to
the DHU is limited only by the cumulative noise effect caused by antenna combining.
1.1.6 Power Requirements
The DHU, DEU, LIU, and RIU are each powered by 120–240 Vac (50–60 Hz) power which is
supplied through a standard three-conductor AC power cord. The DRU is powered by 34–48
Vdc which is supplied by either the DHU, DEU, or an ac/dc wall-mount style converter. When
the DRU is powered by the DHU or DEU, the power is fed through a category 3 or 5 cable
terminated with male RJ-45 connectors.
1.1.7 Fault Detection and Alarm Reporting
LED indicators are provided on the front panel of the various units to indicate if the system is
normal or if a fault is detected. In addition, normally open and normally closed alarm contacts
(for both major and minor alarms) are provided at the DHU for connection to a customer
provided external alarm system. This could be a local system or automatic call-out system.
1.2 Digital Host Unit Description
The DHU, shown in Figure 2, serves as the BTS servicing unit for the Digivance ICS. The
DHU provides the following basic functions:
• RF inputs and outputs
• Optical interface to the DRUs or DEUs
• Digitizing of the cellular forward path RF signal

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• Distribution of the digitized forward path RF signals into six digitized optical signals
• Conversion of up to six reverse path digitized optical signals to six digitized RF signals
• Combining of the six digitized RF signals into a single composite digitized RF signal
• Conversion of the combined digitized RF signal to a composite RF signal
• DC power for powering the DRUs
• Relay contact closures to provide alarm information to an external alarm system
17.2 INCHES
(437 mm)
3.5 INCHES
(89 mm)
11.4 INCHES
(290 mm)
15.3 INCHES
(389 mm)
FRONT PANEL
CABLE MANAGEMENT
TRAY
MOUNTING
BRACKET
(BOTH SIDES)
16418-A
Figure 2. Digital Host Unit
1.2.1 Primary Components
The DHU consists of two electronic circuit board assemblies, a power supply assembly, and a
fan assembly that are mounted within a powder-coated sheet metal enclosure. The metal
enclosure provides a mounting point for the electronic assemblies, serves as a heat sink, and
controls RF emissions. Except for the fan units, the electronic circuit board assemblies are not
user replaceable. The DHU is designed for use within a non-condensing indoor environment
such as inside a wiring closet or cabinet. All controls, connectors, and indicators are mounted
on the DHU front panel for convenient access. Cable management functions for the power and
fiber optic cables are provided by a cable management tray that extends outward from the
DHU front panel.
1.2.2 Mounting
The DHU may be used in both rack-mount and wall-mount applications. For rack mount
applications, a pair of reversible mounting brackets is provided that allow the DHU to be
mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. When rack-mounted,
the front panel of the DHU is flush with the front of the rack. The cable management tray
extends 3.9 inches (99 mm) beyond the front panel. For wall-mount applications, a pair of
holes is provided in the cable management tray which allow the DHU to be mounted on any
flat vertical surface. The DHU should be oriented with the front panel facing upward when
wall-mounted. Fasteners are provided for rack-mount applications.

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1.2.3 Fault Detection and Alarm Reporting
The DHU is designed to detect internal circuitry faults and optical port faults. Various front
panel Light Emitting Diode (LED) indicators turn from green to red or yellow if a fault is
detected or an optical input is lost. A set of alarm contacts (normally open and normally
closed) are also provided for reporting an alarm to an external alarm system when a fault is
detected. Both major alarm (all fault conditions except high temperature) and minor alarm
(high temperature fault condition) contacts are provided.
1.2.4 RF Signal Connections
The RF signal connections between the DHU and the BTS are supported through two type N
female connectors. One connector is used for coaxial cable connection of the forward path RF
signal. The other connector is used for coaxial cable connection of the reverse path RF signal. In
most installations, the DHU will not connect directly to the BTS but will be connected to an
interface device such as the RIU or the LIU. Additional information concerning the DHU to BTS
interface is provided in the Digivance ICS Remote Interface Unit User Manual (ADCP-75-113) and
in the Digivance ICS Local Interface Unit User Manual (ADCP-75-114).
The DHU requires a composite forward path RF signal level of –20 dBm or lower. An
overdrive limiter protects the system against excessive inputs but does not function during
normal operation. The DHU does not have Automatic Gain Control (AGC).
1.2.5 Optical and Electrical Interface Connections
Operation of the DRUs and DEUs is supported by six optical and six electrical ports. Each optical
and electrical interface connection includes a status LED, a small form factor LC type optical
transceiver, an RJ-45 DC power jack, and a port enable/disable switch. An optical port may be
connected to a DRU, a DEU, or not used. An electrical port may be connected to a DRU or not
used. Unused ports require no connections at all and are disabled via the corresponding port
enable/disable switch. When disabled, the port LED is off, the alarm reporting function is disabled,
the laser is off, and the DC power is off. Enabling the enable/disable switch activates all functions.
1.2.6 Powering
The DHU is powered by 120–240 Vac (50–60 Hz) power which is supplied through a standard
three-conductor AC power cord. The power cord is provided with the DHU and is 98 inches
(2.5 meters ) long. A resetable circuit breaker/On-Off switch is provided at the unit front
panel. The switch applies power to the DHU internal power supply.
1.2.7 Cooling
Continuous air flow for cooling is provided by dual fans mounted on the right side of the housing.
A minimum of 3 inches (76 mm) of clearance space must be provided on both the left and right
sides of the DHU for air intake and exhaust. An alarm is provided that indicates if a high
temperature condition (>50º C/122º F) occurs. The fans may be field-replaced if either fan fails.
1.2.8 User Interface
The DHU user interface consists of the various connectors, switches, terminals, and LEDs that
are provided on the DHU front panel. The DHU user interface points are indicated in Figure 3
and described in Table 1.

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(1) AC POWER CORD
CONNECTOR
(2) AC POWER
ON/OFF SWITCH (3) OPTICAL PORT
LED INDICATOR
(6 PLACES)
(4) OPT/ELEC PORT
ENABLE/DISABLE
SWITCH (6 PLACES)
(5) ELECTRICAL PORT
DC POWER JACK
(6 PLACES)
(6) OPTICAL PORT
OPTICAL ADAPTERS
TX-LEFT - RX-RIGHT
(6 PLACES)
(7) UNIT LED
INDICATOR (10) RF INPUT
CONNECTOR
(8) OVERDRIVE
LED
INDICATOR
(9) ALARM
TERMINAL
STRIP
(11) RF OUTPUT
CONNECTOR
16419-A
NOTE: SHOWN WITHOUT
CABLE MANAGEMENT TRAY
Figure 3. Digital Host Unit User Interface
Table 1. Digital Host Unit User Interface
REF
No. USER INTERFACE DESIGNATION DEVICE FUNCTIONAL DESCRIPTION
1 POWER 3-wire AC power
cord connector
Used for connecting the AC power cord.
2 I/O I/O rocker switch/
circuit breaker
Provides AC power On/Off control and
AC power over current protection.
3 OK/NOK (Ports 1–6) Multi-colored LED
(Red/Green/Yellow)
Indicates if the DRU or remote DEU connected
to the optical port is normal or faulty or if the
reverse path optical input from the DRU or
remote DEU is normal or lost. (see Note)
4 ON/OFF (Ports 1–6) I/O rocker switch Enables or disables corresponding
electrical and optical ports.
5 DC PWR (Ports 1–6) RJ-45 jack (female) Used for connecting a DRU cat 3 or 5 power
cable to the designated DC power jack.
6 FIBER (Ports 1–6) Small form factor
LC-type optical
transceiver
Used for connecting each DEU or DRU
forward path and reverse path optical link
to the designated optical port.
7 UNIT Multi-colored LED
(Red/Green/Yellow)
Indicates if the DHU is normal or faulty.
(see Note)
8 OVERDRIVE Multi-colored LED
(Red/Green/Yellow)
Indicates when the forward path RF input
power is overdriving the DHU digitizing
circuitry. (see Note)
9 MAJOR MINOR Screw-type terminal
connector
(14–26 AWG)
Used for connecting an external alarm
system to the DHU. Includes normally open
(NO), normally closed (NC), and common
(COM) wiring connections.
10 RF IN N-type female RF
coaxial connector
Used for connecting the forward path RF
coaxial cable to the DHU.
11 RF OUT N-type female RF
coaxial connector
Used for connecting the reverse path RF
coaxial cable to the DHU.
Note: A detailed description of LED operation is provided in Section 4.

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1.3 Digital Remote Unit Description
The DRU, shown in Figure 4, serves as the cellular user servicing unit for the Digivance ICS.
The DRU provides the following basic functions:
• RF interface to the cellular users via an external antenna
• Optical interface to the DHU or DEU
• Conversion of the forward path digitized optical signal to a digitized RF signal
• Conversion of the digitized forward path RF signal to the original cellular RF signal
• Digitizing of the cellular reverse path RF signal
• Conversion of the digitized reverse path RF signal to a digital optical signal output
• Transports alarm status via optical link
FRONT PANEL
MOUNTING FOOT
(EACH CORNER)
7.0 INCHES
(178 mm)
7.3 INCHES
(185 mm)
2.1 INCHES
(53 mm)
16420-A
Figure 4. Digital Remote Unit
1.3.1 Primary components
The DRU consists of an electronic circuit board assembly that is mounted within a powder-
coated sheet metal enclosure. The metal enclosure provides a mounting point for the electronic
assembly, serves as a heat sink, and controls RF emissions. The electronic circuit board
assembly is not user replaceable. The DRU is designed for use within a non-condensing
indoor environment such as inside a building. All controls, connectors, and indicators (except
the SMA antenna connector) are mounted on the DRU front panel for convenient access.
1.3.2 Mounting
The DRU is equipped with four integral mounting feet that allow it to be mounted on any flat
horizontal or vertical surface. A typical location for mounting the DRU would be above
ceiling tiles where the optical fiber and power cables can be concealed or on a wall. Slots are
provided in the mounting feet for securing the DRU to the mounting surface.

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© 2001, ADC Telecommunications, Inc.
1.3.3 Fault Detection
The DRU is designed to detect internal circuitry faults or loss of system inputs. A front panel
LED indicator turns from green to red when a fault condition is detected or when the optical
input is lost. The DRU sends the fault information to the DHU or DEU over the fiber optic
link. A corresponding port LED at the DHU or DEU turns from green to red when the DRU
reports a fault.
1.3.4 RF Signal Interface
The RF signal interface between the DRU and the cellular users is provided through an
external antenna connected to a female SMA connector. The antenna must be ordered
separately. Several types of antennas with various RF propagations are available. Non-ADC
antennas may also be used with the DRU to meet various application requirements.
1.3.5 Optical Port
The DRU is equipped with a small form factor LC type optical transceiver that provides a
point for connecting the optical link cables. Depending on the application requirements, the
optical port may be connected to either a DHU or a DEU.
1.3.6 Powering
The DRU is equipped with a female RJ-45 jack that provides a point for connecting a DC
power cable. The DRU is powered by 34–48 Vdc power which is supplied through the RJ-45
connector. Power to the DRU may be supplied by the DHU, DEU, or by a 120 Vac to 48 Vdc
power converter (available separately as an accessory item) plugged into a properly grounded
120 Vac outlet. The ac/dc converter is a UL Listed stand alone Limited Power Supply (LPS)
unit with a rated output of 48 Vdc at 1.2 Amps. When powered by the DHU or DEU, a
category 3 or 5 twisted-pair cable terminated with RJ-45 connectors is required.
1.3.7 Cooling
The DRU is cooled by natural convection air flow. The DRU mounting feet are designed to provide
clearance under the unit so that air can enter the DRU enclosure from the bottom and exit through
the top. A minimum clearance of 3 inches (76 mm) must be provided on all sides of the DRU
(except the bottom) to ensure there is adequate air circulation for cooling. In addition, at least one
surface of the DRU installation area must be open to the interior of the building.
1.3.8 User Interface
The DRU user interface consists of the connectors and the LED that are provided on the DRU
front and rear panels. The DRU user interface points are indicated in Figure 5 and described in
Table 2.

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16421-A
REARVIEWFRONTVIEW
(4) ANTENNA CONNECTOR
(1) STATUS LED
(2) 48VDC POWER
CONNECTOR (3) FIBER LINK
OPTICAL ADAPTERS
TX-LEFT - RX-RIGHT
Figure 5. Digital Remote Unit User Interface
Table 2. Digital Remote Unit User Interface
REF
No. USER INTERFACE DESIGNATION DEVICE FUNCTIONAL DESCRIPTION
1 STATUS Multi-colored LED
(Red/Green/Yellow)
Indicates if the status of the DRU is
normal or faulty or if the forward path
optical input is normal or lost. (see Note)
2 48 VDC RJ-45 jack (female) Used for connecting a DC power cable.
3 FIBER
TX RX
Small form factor
LC-type optical
transceiver
Used for connecting the forward path and
reverse path optical links.
4 – SMA-type coaxial
connector (female)
Used for connecting the antenna coaxial
cable lead.
Note: A detailed description of LED operation is provided in Section 4.
1.4 Digital Expansion Unit Description
The DEU, shown in Figure 6, serves as a service expansion unit and line extender for the
Digivance ICS. The DEU provides the following basic functions:
• Optical interface to the DHU and up to six DRUs or DEUs
• Conversion of the forward path digitized optical signal to an electrical bit stream
• Splitting of the electrical bit stream into six separate bit streams
• Conversion of the six forward path electrical bit streams into six digital optical signals
• Conversion of up to six reverse path digital optical signals into six serial bit streams
• Combining of the six reverse path serial bit streams into a single digital composite signal
• Conversion of the single digital composite signal to a digital optical signal
• DC power for powering the DRUs
• Alarm transport via the optical links

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FRONT PANEL
CABLE MANAGEMENT
TRAY
MOUNTING
BRACKET
(BOTH SIDES)
16422-A
3.5 INCHES
(89 mm)
11.4 INCHES
(290 mm)
15.3 INCHES
(389 mm)
17.2 INCHES
(437 mm)
Figure 6. Digital Expansion Unit
1.4.1 Primary Components
The DEU consists of two electronic circuit board assemblies and a power supply that are
mounted within a powder-coated sheet metal enclosure. The metal enclosure provides a
mounting point for the electronic assemblies and serves as a heat sink. Except for the fan
units, the electronic circuit board assemblies are not user replaceable. The DEU is designed for
use within a non-condensing indoor environment such as inside a wiring closet or cabinet. All
controls, connectors, and indicators are mounted on the DEU front panel for convenient
access. Cable management functions for the power and fiber optic cables are provided by a
cable management tray that extends outward from the DEU front panel.
1.4.2 Mounting
The DEU may be used in both rack-mount and wall-mount applications. For rack mount
applications, a pair of reversible mounting brackets is provided that allow the DEU to be
mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. When rack-mounted,
the front panel of the DEU is flush with the front of the rack. The cable management tray
extends 3.9 inches (99 mm) beyond the front panel. For wall-mount applications, a pair of
holes is provided in the cable management tray which allow the DEU to be mounted on any
flat vertical surface. The DEU should be oriented with the front panel facing upward when
wall-mounted. Fasteners are provided for rack-mount applications.
1.4.3 Fault Detection
The DEU is designed to detect internal circuitry faults or loss of system inputs. Various front
panel Light Emitting Diode (LED) indicators turn from green to red or yellow when a fault is
detected or when an optical input is lost. The DEU transports the fault information to the DHU
or supporting DEU over the fiber optic link. A corresponding port LED at the DHU or DEU
turns from green to red when the DEU reports a fault.

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1.4.4 Optical and Electrical Interface Connections
Operation of the DRUs and DEUs is supported by six optical and six electrical ports. Each
optical and electrical interface connection includes a status LED, a small form factor LC type
optical transceiver, an RJ-45 DC power jack, and a port enable/disable switch. An optical port
may be connected to a DRU, a DEU, or not used. An electrical port may be connected to a
DRU or not used. Unused ports require no connections at all and are disabled via the
corresponding port enable/disable switch. When disabled, the port LED is off, the alarm
reporting function is disabled, the laser is off, and the DC power is off. Enabling the
enable/disable switch activates all functions. The DEU also provides one optical port
designated the host port for the optical interface with the DHU or a supporting DEU.
1.4.5 Powering
The DEU is powered by 120–240 Vac (50–60 Hz) power which is supplied though a standard
three-conductor AC power cord. The power cord is provided with the DEU and is 98 inches
(2.5 meters) long. A reset able circuit breaker/On-Off switch is provided at the unit front
panel. The switch applies power to the DEU internal power supply.
1.4.6 Cooling
Continuous air flow for cooling is provided by dual fans mounted on the right side of the sheet
metal housing. A minimum of 3 inches (76 mm) of clearance space must be provided on both
the left and right sides of the DEU for air intake and exhaust. An alarm is provided that
indicates if a high temperature condition (>50º C/122º F) occurs. The fans may be field-
replaced if either unit fails.
1.4.7 User Interface
The DEU user interface consists of the various connectors, switches, and LEDs that are
provided on the DEU front panel. The DEU user interface points are indicated in Figure 7 and
described in Table 3.
16423-A
(2) AC POWER
ON/OFF SWITCH (3) OPTICAL PORT
LED INDICATOR
(6 PLACES)
(4) OPT/ELEC PORT
ENABLE/DISABLE
SWITCH (6 PLACES)
(8) UNIT LED
INDICATOR
(1) AC POWER CORD
CONNECTOR (5) ELECTRICAL PORT
DC POWER JACK
(6 PLACES)
(6) OPTICAL PORT
OPTICAL ADAPTERS
TX-LEFT - RX-RIGHT
(6 PLACES)
(9) HOST PORT
LED
INDICATOR
(7) HOST PORT
OPTICAL ADAPTERS
TX-LEFT - RX-RIGHT
NOTE: SHOWN WITHOUT
CABLE MANAGEMENT TRAY
Figure 7. Digital Expansion Unit User Interface

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Table 3. Digital Expansion Unit User Interface
REF
No. USER INTERFACE DESIGNATION DEVICE FUNCTIONAL DESCRIPTION
1 POWER 3-wire AC power
cord connector
Used for connecting the AC power cord.
2 I/O I/O rocker switch/
circuit breaker
Provides AC power On/Off control and
AC power over current protection.
3 OK/NOK (Ports 1–6) Multi-colored LED
(Red/Green/Yellow)
Indicates if the DRU or remote DEU
connected to the optical port is normal or
faulty or if the reverse path optical input
from the DRU or remote DEU is normal
or lost. (see Note)
4 ON/OFF (Ports 1–6) I/O rocker switch Enables or disables corresponding
electrical and optical ports.
5 DC PWR (Ports 1–6) RJ-45 jack (female) Used for connecting a DRU cat 3 or 5 power
cable to the designated DC power jack.
6 FIBER (Ports 1–6) Small form factor
LC-type optical
transceiver
Used for connecting each DRU or remote
DEU forward path and reverse path optical
link to the designated optical port.
7 HOST PORT Small form factor
LC-type optical
transceiver
Used for connecting the DHU or supporting
DEU forward path and reverse path optical link.
8 UNIT Multi-colored LED
(Red/Green/Yellow)
Indicates if the DEU is normal or faulty.
(see Note)
9 HOST PORT Multi-colored LED
(Red/Green/Yellow)
Indicates if the forward path optical input
from the DHU or supporting DEU is
normal or lost. (see Note)
Note: A detailed description of LED operation is provided in Section 4.
1.5 Terms and Definitions
Refer to Table 4 for a listing of the terms used in this manual and their definition.
Table 4. Terms and Definitions
TERM DEFINITION
Alarm Response The response to an alarm input.
Base Transceiver Station The radio equipment that transmits and receives the voice and
control channels to and from the cellular handsets.
Composite Signal The sum of several combined signals.
Digital Expansion Unit The unit that extends a single optical interface to multiple optical
interfaces or that extends an optical run.
Digital Host Unit The unit that converts and provides the digital source signal to all DEUs
and DRUs and converts summed inputs from DEUs and DRUs.
(continued)