ADC Telecommunications DLC1902A Digivance 1900 MHz 20 Watt System User Manual 75158

ADC Telecommunications Inc Digivance 1900 MHz 20 Watt System 75158

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Date Submitted2003-08-22 00:00:00
Date Available2003-08-22 00:00:00
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Document Title75158.book
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FCC ID: F8I-DLC1902A
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
The NOC/NEM interface is a command line interface that is presented at an NOC terminal. The
NOC/NEM interface is used for remote control and monitoring operations. The NOC/NEM
interface consists of ASCII text strings that are input as standard SET or GET commands which
are followed by the action or information required. A text string response is received from the
specified system or systems to confirm the requested action or to report the requested
information. Examples of several typical NOC-NEM interface commands and the responses
received are shown in Figure 2-19. The NOC/NEM interface requires only a VT100 terminal/
emulator or a PC-type computer that is loaded with a communication software such as
Procomm Plus. While primarily intended for use at the NOC, the NOC/NEM interface
commands may also be input from the EMS computer.
Figure 2-19. NOC/NEM Interface Typical Commands
11 SPECIFICATIONS
Refer to Table 2-6 for the Digivance 1900 MHz 20 Watt System nominal specifications. All
specifications apply after a five minute warm-up period.
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications
PARAMETER
SPECIFICATION
REMARKS
Optical - Host and Remote Unit
Fiber type
9/125, single-mode
Number of fibers required
Direct
With WDM
Forward path wavelength
1550 nm
Reverse path wavelength
1310 nm
The wavelength division multiplexer (WDM) is an accessory.
Page 2-27
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications, continued
PARAMETER
SPECIFICATION
Optical transmit power output
Host Unit
Remote Unit
0 dBm
+2 dBm
Optical budget
25 dB
Optical receive input
–15 dBm maximum
Optical connectors
Industry standard SC
REMARKS
For optical BER of 10–6
Host, remote, and WDM
Optical - Host and Remote WDM
Passband
1310 nm ± 20 nm
1550 nm ± 20 nm
Forward path insertion loss
Host WDM
Remote WDM
0.7 dB
0.3 dB
Does not include connector loss
Reverse path insertion loss
Host WDM
Remote WDM
0.3 dB
0.7 dB
Does not include connector loss
Isolation
> 30 dB minimum
Return loss (Reflectance)
< –50 dB
All input ports
RF Forward Path - 1900 MHz
System bandwidth
Frequency range
AD
DBE
BEF
EFC
Out-of-band emissions
Primary
Secondary (see Note 1)
Gain of forward path
(Host input to Remote antenna
port)
Gain flatness
Band flatness
Channel flatness
20 MHz AD band, 25 MHz
DBE, BEF, and EFC bands
1930 to 1950 MHz
1945 to 1970 MHz
1950 to 1975 MHz
1965 to 1990 MHz
–13 dBm per 1 MHz bandwidth
from 10 kHz to 20 GHz
–98 dBm per 100 kHz from 824
to 849 MHz and from 1850 to
1910 MHz
80.5 dB at band center, room
temperature, and 0 dB attenuation setting
± 1.5 dB across freq. range
±1 dB variation across any 1.25
MHz channel
Gain variation
± 3 dB over temp and unit-tounit
Out-of-band rejection
–40 dB at > ±17.5 MHz from
881.5 MHz
Propagation delay
6 µs
Page 2-28
© 2003, ADC Telecommunications, Inc.
Includes power amplifier.
Excludes fiber delay
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications, continued
PARAMETER
SPECIFICATION
Configurable propagation delay
Range
Step size
Up to 63 µs
0.1µs
Spurious
In-band self generated
Free dynamic range
–13 dBm at remote output
60 dB at 30 kHz bandwidth
Transmit peak-to-average
10 dB
Two-tone Intermodulation
–55 dBc at remote output
Two CW tones at 5 Watts each
CDMA Intermodulation
885 kHz to 1.25 MHz
1.25 to 1.98 MHz
1.98 to 2.25 MHz
–45 dBc per 30 kHz
–8 dBm per 30 kHz
–55 dBc per 30 kHz
Absolute level
Nominal composite RF input
signal level
–40 dBm at 0 dB attenuation
–9 dBm at max. attenuation
An input signal level of –40 dBm
provides maximum output power
Configurable input level
Range
Step size
Composite RF Output power
Configurable RF Output
Range
Step size
Transmit path insertion loss
REMARKS
Plus standard propagation delay
31 dB
1 ± 0.5 dB ±10% of attenuation
monotonic
40.5 dBm (11 Watts) at remote
20 Watts at power amplifier outantenna port with –40 dBm input put
31 dB at remote unit
1 ±0.5 dB ±10% of attenuation
monotonic
2.5 dB
RF Reverse Path - 1900 MHz
System bandwidth
A band
B band
20 MHz AD band, 25 MHz
DBE, BEF, and EFC bands
Frequency range
AD
DBE
BEF
EFC
1850 to 1870 MHz
1865 to 1890 MHz
1870 to 1895 MHz
1885 to 1910 MHz
In band spurs (caused by an indi- –75 dBc (1 MHz to 20 GHz and
vidual out-of-band signal)
> 10 MHz out-of-band)
–120 dBc (1930 to 1990 MHz)
–120 dBc (869 to 894 MHz)
Propagation delay
6 µs
Configurable propagation delay
Range
Step size
Up to 63 µs
0.1µs
Required for dual band
Excludes fiber delay
Plus standard propagation delay
Page 2-29
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications, continued
PARAMETER
Gain flatness
Band flatness
Channel flatness
Gain of reverse path
Overall gain
SPECIFICATION
REMARKS
±1.5 dB across frequency range
±1 dB variation across any 1.25
MHz channel
30 dB at band center at room
temperature
3 dB over temperature
ALC not invoked
Out-of-band rejection
–40 dB at > ±17.5 MHz from
836.6 MHz
ALC not invoked
Spurious (in-band self generated)
–110 dBm referred to input
ALC not invoked
Intermodulation
–62 dBc two tones at –50 dBm
System noise figure
8 dB at mid-band
Gain variation
Configurable RF output
Range
Step size
ALC not invoked
ALC not invoked
31 dB
1 ±0.5 dB ±10% of attenuation
monotonic
Blocking dynamic range
70 dB
Level limiting ALC threshold
–40 dBm dB instantaneous
Level limiting ALC range
30 dB
RF Forward and Reverse Path
Modulation Accuracy
Service/Mod Type/Parameter
TDMA/n/4-DQSK/rms EVM
GSM/GMSK/rms phase error
EDGE/8PSK/rms EVM
EIA-97D/CDMA/rho factor
7%
4º
7%
.97%
Physical/Environmental/
Electrical - Host Unit
Dimensions (H×W×D)
3.5 × 17.2 × 15.3 inches
(89 × 437 × 389 mm)
Dimension for width does not
include the mounting brackets
which can be installed for either
19- or 23-inch racks.
Mounting
19- or 23-inch rack
EIA or WECO
Weight
18 lbs. (8.2 kg)
Weather resistance
Indoor installation only
Operating temperature
0º to 50º C (32º to 122º F)
Storage temperature
–40º to 70º C (–40º to 158ºF)
Humidity
10% to 90%
No condensation
External alarm connector
Screw-type terminals
NO and NC relay contacts
Page 2-30
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications, continued
PARAMETER
SPECIFICATION
DC power connector
Screw-type terminal strip
RF coaxial cable connectors
N-type (female)
Service connector
DB-9 (female)
CAN connectors
RJ-45 jack
Power input
± 24 or ± 48 VDC
Power consumption
55 watts
Current rating
1 Amp at –48 VDC
Reliability at 25ºC
MTBF 80,000 hours
REMARKS
RS-232 DTE interface
± 21 to ± 60 VDC
Excluding fans
Physical/Environmental/
Electrical - Remote Unit Outdoor
Cabinet
Cabinet dimensions (H×W×D)
25.6 × 10.13 × 20.75 inches
(674 × 257 × 527 mm)
Mounting
Wall, pole, or pedestal
Pedestal mounting requires pedestal mount kit. (accessory)
Weight
80 lbs (36.3 kg)
Includes modules
Weather resistance
NEMA-3R, removable dust filter
Operating temperature
–30º to 50º C (–22º to 122º F)
Storage temperature
–40º to 70º C (–40º to 158ºF)
Humidity
10% to 90%
No condensation
External alarm connector
Screw-type terminals
External alarm inputs
AC power connection
3/4- or 1/2-inch conduit
Per local code or practice.
Antenna cable connector
N-type female
Fiber optic cable size
0.375 to 0.875 inch (10 to 22
mm) diameter cable
Lightning protection
20 kA IEC 1000-4-5 8/20 µs
waveform
Service connector
DB-9 female (on STM)
Power input
120 or 240 VAC, 50 or 60 Hz
Power consumption
360 Watts
Current rating
5 Amps maximum at 120 VAC
Reliability at 25ºC
MTBF 50,000 hours
9/125, single-mode
RS-232 DTE interface
Excluding fans and air filter
Physical/Environmental/
Electrical - Remote Unit Indoor
Mounting Shelf
Mounting Shelf dimensions
(H×W×D)
14.15 × 17.39 × 15.6 inches
(359 × 442 × 396 mm)
Page 2-31
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 2: Description
Table 2-6. 1900 MHz 20 Watt System Nominal Specifications, continued
PARAMETER
SPECIFICATION
REMARKS
Mounting
19-inch equipment rack
WECO or EIA
Weight
50 lbs. (22.7 kg)
Includes modules
Operating temperature
–30º to 50º C (–22º to 122º F)
Storage temperature
–40º to 70º C (–40º to 158ºF)
Humidity
10% to 90%
No condensation
External alarm connector
Screw-type terminals (on STM)
External alarm inputs
AC power connection
AC power cord with standard 3prong 120 VAC plug.
Antenna cable connector
N-type female (on STM)
Fiber optic cable connector
SC-type (on STM)
Service connector
DB-9 female (on STM)
RS-232 DTE interface
Power input
120 or 240 VAC, 50 or 60 Hz
Operation on 240 VAC requires
power cord with 240 VAC plug.
Power consumption
360 Watts
Current rating
3 Amps maximum at 120 VAC
Reliability at 25ºC
MTBF 50,000 hours
Excluding fans and air filters
Note 1: Required for co-located sites such as dual band. Otherwise, the emissions from one unit
can limit the sensitivity of the other.
Page 2-32
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
SECTION 3: HOST UNIT INSTALLATION
Content
Page
BEFORE STARTING INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
1.1
Tools and Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
1.2
Unpacking and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
FIBER OPTIC CABLE ROUTING AND INSTALLATION GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
WDM MOUNTING PROCEDURE (OPTIONAL ACCESSORY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
HU MOUNTING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
CHASSIS GROUND CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
COAXIAL CABLE CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
OPTICAL CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
7.1
Optical Connections Without WDM or CWDM system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
7.2
Optical Connections With WDM System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
CONTROLLER AREA NETWORK CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
EMS COMPUTER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
10
EXTERNAL ALARM SYSTEM CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
11
DC POWER CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
_________________________________________________________________________________________________________
BEFORE STARTING INSTALLATION
This section provides the installation procedures for the HU, the WDM host module mounting
shelf (accessory), and the WDM host module (accessory). Installation of the RU outdoor
cabinet or RU indoor mounting shelf and the RU electronic modules may proceed separately
from installation of the HU. The mounting procedures for the outdoor remote cabinet are
provided in the 20 Watt Outdoor Remote Cabinet Mounting Instructions (ADCP-75-147) which
are shipped with the cabinet. The installation procedures for the STM and LPA electronic
modules are provided in the 20 Watt Indoor Remote Unit Installation Instructions (ADCP-75149) and the 20 Watt Outdoor Remote Unit Installation Instructions (ADCP-75-148) which are
shipped respectively with the outdoor cabinet and indoor mounting shelf. When all units of the
Digivance system have been installed, refer to Section 4 of this manual for the system turn-up
and test procedures.
Before beginning the installation, review the system design plan with the system engineer.
Make sure each equipment installation site is identified and located and all cable runs are
mapped out.
1.1
Tools and Materials
The following tools are required to complete the procedures in this section:
• Box cutter
• Pencil or scribe
• Medium size flat-bladed screwdriver
Page 3-1
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
•
•
•
•
•
•
•
•
Phillips screwdriver (#2)
TORX screwdriver (T20 bit)
Pliers
Wire cutters
Wire stripper
Tool kit for attaching N-type male connectors to coaxial cable
Multimeter
Optical power meter
The following materials are required to complete the procedures in this section:
•
•
•
•
•
•
•
•
•
1.2
#18 AWG (1.0 mm) insulated stranded copper wire (for chassis grounding wire)
#18 AWG (1.0 mm) red and black insulated copper wire (for DC power wires)
Category 3 or 5 cable (for external alarm system wires)
#6 ring terminal (1) for #18 wire (for chassis ground wire connection)
#6 fork terminals (2) for #18 wire (for DC power wiring connection)
Single-mode patch cord(s) with SC connectors (1, 2 or 3 depending on the application)
High performance, flexible, low-loss 50-ohm coaxial cable
N-type male connectors
Wire ties
Unpacking and Inspection
This section 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 HU and any accessories:
1. Open the shipping cartons and carefully unpack each component from the protective
packing material.
2. Check each component for broken or missing parts. If there are 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.
FIBER OPTIC CABLE ROUTING AND INSTALLATION GUIDELINES
The outside plant (OSP) fiber optic cables should be routed between the HU and RU and
terminated before the equipment is installed. A diagram of a typical fiber optic cable routing is
shown in Figure 3-1. At the HU, the OSP cable should be terminated at a fiber distribution panel
and spliced to pigtails. Patch cords may then be used to link the HU optical ports to the OSP
cable terminations. Whenever possible, a guideway such as the FiberGuide system should be
provided to protect the fiber optic patch cords from damage and to prevent excessive bending.
The procedures for connecting the OSP cable optical fibers to the HU is provided in Section 7.
Page 3-2
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
HOST SITE
SPLICE
HOST UNIT
TERMINATION
OUTSIDE PLANT
CABLE
FIBER DISTRIBUTION
PANEL
PATCH
CORDS
INDOOR
REMOTE SITE
OUTDOOR
REMOTE SITE
STM
INDOOR
MOUNTING
SHELF
STM
OUTDOOR
CABINET
PATCH
CORDS
INDOOR/OUTDOOR
CABLE WITH
PIGTAIL LEADS
FIBER DISTRIBUTION
PANEL
SPLICE
ENCLOSURE
18626-A
Figure 3-1. Typical Fiber Optic Cable Routing
When routed to the RU outdoor cabinet, the OSP fiber optic cable should be spliced to a
connectorized outdoor-rated cable (consisting of individual jacketed pigtails) which is then
routed into the outdoor cabinet. The individual pigtails can then be connected directly to the
STM optical ports. A connector is provided on the bottom of the RU outdoor cabinet to seal the
cable entry point and provide strain relief. The procedure for routing the fiber cable into an
outdoor cabinet and for connecting the pigtail leads to the STM is provided in the Digivance 20
Watt Outdoor Remote Unit Installation Instructions (ADCP-75-148).
When routed to RU indoor mounting shelf, the OSP cable should be terminated at a fiber
distribution panel and spliced to pigtails. Jumper patch cords may then be used to link the STM
optical ports to the OSP cable terminations. Whenever possible, a guideway such as the
FiberGuide system should be provided to protect the fiber optic patch cords from damage and to
prevent excessive bending. The procedure for connecting the OSP optical fibers to an STM
mounted in the indoor mounting shelf is provided in the Digivance 20 Watt System Indoor
Remote Unit Mounting Shelf Installation Instructions (ADCP-75-149).
Page 3-3
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
WDM MOUNTING PROCEDURE (OPTIONAL ACCESSORY)
A bi-directional wavelength division multiplexer (WDM) system is available as an accessory
item for the Digivance system. If the application does not require the use of a WDM system,
skip this section and proceed to Section 4.
At the HU, the WDM system consists of a WDM host module and a WDM host module
mounting shelf. Each host module can support two HU’s and each host module mounting shelf
can hold two host modules. A fully loaded host module mounting shelf can therefore support
four HU’s.
When multiple HU’s require connection to a WDM system, the host module mounting shelf and
the HU’s should be mounted in the equipment rack as shown in Figure 3-2. This configuration
allows the pigtail leads from the two host modules to be connected directly to the optical ports
on any one of the four HU’s.
POWERWORX
FUSE PANEL
HOST UNITS
WDM MOUNTING
SHELF
(WITHOUT MODULES)
18652-A
Figure 3-2. Typical WDM and HU Configuration
The WDM host module mounting shelf may be mounted in either a 19-inch or 23-inch EIA or
WECO equipment rack. Four #12-24 screws are provided for securing the mounting shelf to the
rack. Use the following procedure to install the host module mounting shelf in the equipment
rack and to mount the host modules in the host module mounting shelf:
1. The host module mounting shelf is shipped with the mounting brackets installed for 19inch EIA rack installations. If installing the mounting shelf in a 19-inch EIA rack, proceed
to step 5. If installing the mounting shelf in a 19-inch WECO rack, a 23-inch EIA rack, or
a 23-inch WECO rack, proceed to step 2.
Page 3-4
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
2. Remove both mounting brackets from the mounting shelf (requires Phillips screwdriver)
and save screws for reuse.
3. Locate the extra mounting brackets that are provided with the mounting shelf and select
the brackets that correspond to the rack type. Each mounting shelf includes extra brackets
for installing the mounting shelf in the following rack types:
•
•
•
•
19-inch EIA
19-inch WECO
23-inch EIA
23-inch WECO
4. Install the replacement mounting brackets as shown in Figure 3-3. Use the screws
removed in step 2 to attach the new brackets to the mounting shelf.
16885-A
Figure 3-3. Installing the Replacement Mounting Brackets
5. Position the mounting shelf in the designated mounting space in the rack (per system
design plan) and then secure the mounting brackets to the rack using the four #12-24
machine screws provided as shown in Figure 3-4.
6. Install each host module in the mounting shelf (see Figure 3-4). A rail on the side of the
module fits into a guide within the mounting.
7. Secure each host module to the mounting shelf by twisting the handle on each quarter-turn
fastener 90º.
8. Carefully store the pigtail leads from each host module. The routing and connection
procedures for the pigtails are provided in Section 7.
Page 3-5
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
WDM MOUNTING
SHELF
WDM MODULE
16888-A
Figure 3-4. WDM Host Module Mounting Shelf and WDM Host Module Installation
HU MOUNTING PROCEDURE
The HU 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 HU. When loading
the HU 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 safety support the combined
weight of all the equipment it holds. In addition, maximum recommended ambient temperature
for the HU is 50º C (122º F). Allow sufficient air circulation or space between units when the
HU is installed in a multi-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.
Note: To insure that all optical connectors remain dust-free during installation, leave all dust
caps and dust protectors in place until directed to remove them for connection.
Use the following procedure to install the HU in the equipment rack:
1. The HU is shipped with the mounting brackets installed for 19-inch rack installations. If
mounting the HU in a 19-inch rack, proceed to step 4. If mounting the HU in a 23-inch
rack, proceed to step 2.
2. Remove both mounting brackets from the HU (requires TORX screwdriver with T20 bit)
and save screws for reuse.
Page 3-6
© 2003, ADC Telecommunications, Inc.
ADCP-75-158 • Preliminary Issue A • June 2003 • Section 3: Host Unit Installation
3. Reinstall both mounting brackets so the long side of the bracket is flush with the HU front
panel as shown in Figure 3-5. Use the screws removed in step 2 to re-attach the brackets to
the HU chassis.
REMOVE AND REINSTALL MOUNTING
BRACKETS AS SHOWN FOR
INSTALLATION IN 23-INCH RACKS
18653-A
Figure 3-5. Installing the Mounting Brackets for 23-Inch Rack Installations
4. Position the HU in the designated mounting space in the rack (per system design plan) and
then secure the mounting brackets to the rack using the four machine screws provided (use
#12-24 or M6 x 10 screws, whichever is appropriate) as shown in Figure 3-6.
Note: Provide a minimum of 3 inches (76 mm) of clearance space on both the left and
right sides of the HU for air intake and exhaust.
18654-A
Figure 3-6. HU Rack Mount Installation
Page 3-7
© 2003, ADC Telecommunications, Inc.

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