ADC DIS190AB Users Manual

3.6 System Expansion Planning

The DEU enables 6-way expansion of any optical port. This makes it possible to add more
DRU’s without having to install additional DHU’s. Each DHU is equipped with six optical
ports. If more than six DRU’s 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 DRU’s to the
DHU through the installation of DEU’s.

The total number of DRU’s that can be served is limited by the cumulative noise effect caused
by antenna combining. This number cannot be determined until the radius distance of coverage
required at the DRU antenna is determined and the path loss attributed to the structure are
known. The system design requires that the carrier to noise differential be greater than the
customer’s desired signal to noise ratio.

If it is likely that the system will be expanded in the future, locate the DHU in such a way that it can
be used as a hub for an expanded system. It should be noted that a DEU can be used as an optical
regenerator. A DRU may sometimes need to be located at a point that is beyond the distance
limitation imposed by the optical fiber. The solution is to install a DEU at the maximum optical
fiber length from the DHU. This provides an additional 500 m, 750 m, or 10 km (depending on the
fiber type) of optical fiber length beyond the DEU for connecting the DRU.

ADCP-75-132 • Issue 2C • August 2006

3.7 DRU Antenna Options

Various antennas, shown in Figure 12, are available from ADC for use with the DRU. All
antennas include a 6-foot (1.8 m) long 50-ohm coaxial cable (equipped with SMA male
connector) for connection to the DRU. The DRU is equipped with an SMA female connector
for connecting the antenna cable.

The DRU antennas are designed for unobtrusive mounting within an office environment. Each
type of antenna provides a specific coverage pattern in order to accommodate the shape of the
area where coverage is required. The ceiling-mount omni directional antenna is designed to
mount in the center of the coverage area. The directional panel antenna is designed to mount
vertically on one side of the coverage area or in the corner of the coverage area. The ceiling
mount hallway antenna is designed to mount in the center of long corridors. Non-ADC
antennas may also be used with the DRU to meet various application requirements, but must
comply with equipment authorization for RF exposure compliance.

Note: To comply with Maximum Permissible Exposure (MPE) requirements, antennas must

be installed to provide at least 20 centimeters (8 inches) of separation from all persons per
FCC 47 CFR part 2.1091 and IC RSS-102, Section 2.5.2.

© 2006, ADC Telecommunications, Inc.

Page 23

ADCP-75-132 • Issue 2C • August 2006

MOUNTING STUD
LENGTH - 1.5 INCHES (38 mm)
DIAMETER - 0.875 INCHES (22 MM)

4 dBi GAIN

CEILING-MOUNT

HALLWAY

DIAMETER - 4.2 INCHES (106.7 MM)
DEPTH - 0.91 INCH (23 MM)

2.5 dBi GAIN CEILING-MOUNT
OMNIDIRECTIONAL

1.4 INCHES
(36 MM)

INCLUDES ADJUSTABLE

MOUNTING BRACKET

(NOT SHOWN)

3 INCHES

(75 MM)

6 INCHES

(152 MM)

5.5 INCHES
(140 MM)

8 dBi GAIN

90 DEGREE DIRECTIONAL PANEL

(WALL/CORNER-MOUNT)

Figure 12. 1900 MHz DRU Antenna Options

18079-A

2.4 INCHES
(61 MM)

0.29 INCH
(7.4 MM)

3.8 External Alarm System Reporting Requirements

The DHU provides normally open (NO) and normally closed (NC) form C dry alarm relay
contacts for reporting minor and major alarms to an external alarm system. A minor alarm is
defined as a high temperature condition. A major alarm is defined as any fault condition
except high temperature. Connections to the alarm contacts are provided through a screw-type
terminal strip. Category 3 or 5 cable should be used for the alarm wires. If an external alarm
system is not in use, no alarm connections are required.

3.9 Maintenance Requirements

The Digivance ICS requires no regular maintenance to insure continuous and satisfactory operation.
Maintenance, as it applies to the Digivance ICS, primarily involves diagnosing and correcting
service problems as they occur. Faults and failures arising from within the Digivance ICS will
generate an external alarm response which includes lighting an LED indicator(s) and closing or
opening a set of alarm contacts. When an alarm is reported, it will be necessary to isolate the source

Page 24

© 2006, ADC Telecommunications, Inc.

of the problem by observing the LED indicators on each unit and then performing various tests to
isolate the problem. Once the source of the fault is isolated, the appropriate action can be taken to
correct the problem. The only unit components that can be replaced are the cooling fans which are
mounted in the DHU and the DEU and the modular optical transceivers. The failure of any other
component within a unit will require replacement of the unit. Basic trouble-shooting procedures are
provided in Section 6 of this manual.

3.10 System Design Recommendations

Follow a systematic process when designing an in-building coverage solution. The following
sub sections outline the four phases of the in-building coverage solution design process.
System design and planning services are available from ADC if required. Refer to Section 7 of this
manual for additional information.

3.10.1 Phase One – Initial Evaluation

Qualify the Installation: Confirm that there are no extenuating circumstances that would
prevent a successful installation such as: extreme cellular system issues (blocking, severe
interference, site problems, etc.), building issues, power issues, or safety issues (site should
not present any hazards or conditions that would make operation of the equipment unsafe).

ADCP-75-132 • Issue 2C • August 2006

Analyze the RF Situation: Determine how the system RF link to the outside world will be
provided. Will it be a direct feed from a BTS (microcell) or an over-the-air connection via a
donor antenna? If it is a donor antenna, is the customer within the coverage footprint of a
serving cell or better? The coverage can be determined during the preliminary walkthrough by
checking the downlink Received Signal Strength Indication (RSSI) outside the building with a
unity gain sampling antenna. Sometimes a rooftop reading is needed to obtain a sufficient
signal level. Note that it is an FCC violation to expand the normal coverage footprint of a
cellular site with an in-building product without prior approval of the service provider. In
addition, consider the impact the system will have on traffic, especially the busy hour.
Confirm with the service provider that the expected increase in the volume of calls will be
addressed (if needed), possibly with additional equipment such as additional channels or a
microcell.

Determine the Amount of Building Attenuation: If a donor antenna will provide the RF link
to the BTS, determine if there is enough signal isolation between the donor antenna and the in­building system to avoid a feedback loop and signal degradation. This step can often be
accomplished during the preliminary walkthrough.

Discuss Installation with Building Management and Engineering: Discuss all initially
anticipated Digivance ICS coverage areas (including any obviously desirable cable routings,

equipment installations, power and mechanical requirements) with the authorized client and
building personnel for an initial approval/confirmation. This gives a good estimate of the
extent of the system work needed. Occasionally, some of the system design work can be
accomplished at this point.

© 2006, ADC Telecommunications, Inc.

Page 25

ADCP-75-132 • Issue 2C • August 2006

3.10.2 Phase Two – System Design

Determine forward and reverse path loss and then design for unity gain on the uplink
and maximum power out of the DRU on the downlink: The overall purpose of the

Digivance ICS is to transparently overcome attenuation losses, not to provide additional gain
beyond what is required to bring the signal to unity gain. Complete the following steps to
make this determination:

1. Determine the in-building reverse path (uplink) losses at typical operating frequencies
and distances from the subscriber handset (terminal) to the DRU. This information will
be used to determine the optimal uplink signal level to the outside world.

2. Determine the typical composite cell site Effective Radiated Power (ERP) into the
system. Calculate the interface adjustment required to feed the required downlink signal
level to the DHU in order to drive the DRU output signal at the desired level.

Determine the location of the DHU and its RF and AC power sources: Complete the
following steps to make this determination:

1. Determine where and how the DHU will be mounted.

2. Determine the location of the DHU AC power source.

3. Determine the RF source (local interface with BTS or remote interface with BTS through
donor antenna) for the DHU.

4. If local interface connection with the BTS is required, determine the distance to the
DHU.

5. If a remote interface connection with the BTS is required, determine what type of
antenna is needed and where it can be mounted.

6. Determine the attenuation or amplification requirements for the DHU to BTS interface.

Discuss the design of the Digivance ICS installation with building management and
engineering: Explain the proposed system design with building management and engineering

personnel and obtain final design approval prior to installation.

3.10.3 Phase Three – Installation

Use industry standard practices for cabling, installation, and powering to complete the
following:

1. Install the DHU as described in Section 3 of this manual and adjust the RF interface
levels based on the system design specifications. Additional information concerning the
DHU to BTS interface is provided in the Digivance ICS Remote Interface Unit User Manual
(ADCP-75-178) and in the Digivance ICS 800 and 1900 MHz High Power Conditioning
Panel User Manual (ADCP-75-175).

2. Install a DRU as described in the Digital Remote Unit Installation Instructions (ADCP ­75-112). If a donor antenna is used, install the DHU and RIU close to the donor antenna.

Page 26

© 2006, ADC Telecommunications, Inc.

ADCP-75-132 • Issue 2C • August 2006

3. Conduct an initial performance evaluation and complete the following:

a) Confirm proper isolation, signal quality, and power levels.

b) Make test calls from DRU service area and evaluate call quality (confirm with

service provider if desired).

c) Address performance issues as needed.

4. Install the remaining DRU’s and also any DEU’s as described in the Digital Expansion
Unit Installation Instructions (ADCP-75-111). Test call quality and range of each DRU
as needed.

5. Check powering and alarm functions of entire system per Digivance ICS specifications.

3.10.4 Phase Four - Performance Evaluation

Complete the following to evaluate the performance of the Digivance ICS:

1. Evaluate the forward path (downlink) and reverse path (uplink) RF signal levels and
quality.

2. Make continuous calls from DRU to DRU, checking all service areas, seams, and coverage
boundaries for call quality (both DL and UL). Address all quality issues as needed.

3. Place calls both leaving and entering the building(s), in parking lots, etc. Address all
quality issues as needed.

4. Contact client/service provider to inform them when the Digivance ICS is operational.

© 2006, ADC Telecommunications, Inc.

Page 27

ADCP-75-132 • Issue 2C • August 2006

4 DIGITAL HOST UNIT INSTALLATION PROCEDURE

This section provides the installation procedures for the DHU. Installation of the DEU(s) and
DRU(s) may proceed separately from the installation of the DHU. The installation procedures
for the DEU are provided in the Digital Expansion Unit Installation Instructions (ADCP -75-

111) which are shipped with the DEU. The installation procedures for the DRU, the DRU
antennas, and the AC/DC converter (optional DRU accessory) are provided in the Digital
Remote Unit Installation Instructions (ADCP-75-112) which are shipped with the DRU. When
all units of the Digivance ICS have been installed, refer to Section 5 of this manual for the
system power up and test procedures.

4.1 System Plan Review and Pre-Installation Cable Routing

Before beginning the installation, review the system plan with the system engineer. Make sure
each equipment installation site is identified and located and all cable runs are mapped out.
The coaxial, DC power, and fiber optic cables may be routed between the various equipment
locations before the equipment is installed. Whenever possible, route fiber optic cables
through conduit or a guideway such as the FiberGuide system. Avoid routing fibers through
ladder type cable racks or troughs that do not provide sufficient support to limit bending or
prevent accidental damage. Tie-wrapping is not recommended as a means of securing fiber
optic cables. Make sure to leave sufficient slack at each equipment location for connectorizing
and cable management. The procedures for terminating the cables and for connecting the
cables to the DHU are provided in the sections that follow.

4.2 Tools and Materials

The following tools are required in order to complete the procedures in this section:

• Box cutter

• Pencil or scribe

• Medium and small size flat-bladed screwdrivers

• TORX screwdriver (T20 bit)

• Pliers

• Wire cutters

• Wire stripper

• Tool kit for attaching RJ-45 male connectors to category 3 or 5 cable

• Tool kit for attaching N-type male connectors to coaxial cable

• Tool kit for attaching LC connectors to multimode fiber optic cable

• Drill and assorted drill bits (wall-mount installations only)

• Multimeter

• Optical power meter

• Laser light source

• ESD wrist strap

Page 28

© 2006, ADC Telecommunications, Inc.

The following materials are required in order to complete the procedures in this section:

• Wall-mount fasteners (wall-mount applications only)

• #22 AWG (0.40 mm) category 3 or 5 cable (for power cable and external alarm connections)

• RJ-45 male connectors (for power cable)

• #18 AWG (1.00 mm) insulated stranded copper wire (for chassis grounding wire)

• Ring terminal for #18 wire (for chassis ground wire connection)

• 50 or 62.5 micron core multi-mode or 9 micron core single-mode fiber optic cable

• LC-type field installable connectors

• High performance, flexible, low loss 50-ohm coaxial cable

• N-type male connectors

• Wire ties

4.3 Unpacking and Inspection

This subsection provides instructions for opening the shipping boxes, verifying that all parts
have been received, and verifying that no shipping damage has occurred. Use the following
procedure to unpack and inspect the DHU:

ADCP-75-132 • Issue 2C • August 2006

1. Open the shipping carton and carefully unpack the DHU from the protective packing
material.

2. Check the DHU for broken or missing parts. If there are any damages, contact ADC (see
Section 6 at the end of this manual) for an RMA (Return Material Authorization) and to
reorder if replacement is required.

4.4 Frequency Band Selection Procedure

The 1900 MHz version of the DHU may be configured to operate at any one of four frequency
bands. A DIP switch is provided on the underside of the DHU for selecting the required
frequency band. Use the following procedure to set the DIP switch to provide the required
1900 MHz frequency band:

1. Determine the required frequency band for the DHU (AD, DBE, BEF, or EFC) as
specified in the system design plan.

2. Orient the DHU as shown in Figure 13 and then locate the small hole in the bottom of
the DHU that provides access to the band select DIP switch.

3. Use a non-conductive probe to align the DIP switch sliding handles to provide the
required frequency band (see Figure 13).

Caution: The DIP switches on the connected DRU’s must be set to the same frequency band as the

DHU. Any DRU that is set to a different frequency than the DHU will not function properly.

4. Place the copper sticker provided with the DHU over the small opening that provides
access to the DIP switch.

Note: The copper sticker provides EMI/RFI shielding. Do not use some other type of material

to cover the DIP switch access hole.

© 2006, ADC Telecommunications, Inc.

Page 29

ADCP-75-132 • Issue 2C • August 2006

4.5 Mounting Procedure

ALIGN DIP SWITCH HANDLES AS
SHOWN ON THE LABEL TO PROVIDE
SPECIFIED FREQUENCY BAND

SWITCH POSITIONS AS SEEN THROUGH HOLE

MOVABLE TAB SHOWN WHITE

SWITCH POSITIONS AS SEEN THROUGH HOLE

MOVABLE TAB SHOWN WHITE

FORWARD

REVERSE

1930-1950

1850-1870

BLOCK A,D

1945-1970

1865-1890

BLOCK D,B,E

1950-1975

1870-1895

BLOCK B,E,F

1965-1990

1885-1910

BLOCK E,F,C

BLOCK A,D

BLOCK D,B,E

BLOCK B,E,F

BLOCK E,F,C

Figure 13. 1900 MHz Frequency Band Selection

FORWARD

1930-1950

1945-1970

1950-1975

1965-1990

REVERSE

1850-1870

1865-1890

1870-1895

1885-1910

16816-B

The DHU may be either rack-mounted or wall-mounted. Of the procedures that follow, use
whichever procedure is appropriate for the installation:

Note: To insure that all optical connectors and transceivers remain dust-free during

installation, leave all dust caps and dust protectors in place until directed to remove
them for connection.

4.5.1 Rack Mount Installation

The DHU may be mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. Both US
standard and metric machine screws are included for rack mounting the DHU. When loading the
DHU in a rack, make sure the mechanical loading of the rack is even to avoid a hazardous
condition such as a severely unbalanced rack. The rack should safely support the combined weight
of all the equipment it holds and be securely anchored. In addition, the maximum recommended
ambient temperature for the DHU is 50º C (122º F). Allow sufficient air circulation or space
between units when the DHU is installed in a multi-unit rack assembly because the operating
ambient temperature of the rack environment might be greater than room ambient.

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.

Use the following procedure to install the DHU in the equipment rack:

1. The DHU is shipped with the mounting brackets installed for 19-inch rack installations.
If mounting the DHU in a 19-inch rack, proceed to step 4. If mounting the DHU in a 23­inch rack, proceed to step 2.

2. Remove both mounting brackets from the DHU (requires TORX screwdriver with T20 bit)

Page 30

© 2006, ADC Telecommunications, Inc.