Westell DSP85 Original Series User manual
PRODUCT M
A
N
UAL
W
ESTELL.COM
©Westell Technologies
.
960-1666-MNL
rF
Digital Repeater Line
DSP85 Original Series plus
Modular 250 and 251 Series
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 2 of 73
DISCLAIMER
All information and statements contained herein are accurate to the best of Westell Technologies knowledge. Westell
Technologies makes no warranty with respect there to, including without limitation any results that may be obtained
from the products described herein or the infringement by such products of any property rights of any persons. Use
or application of such information or statements is at the users’ sole risk, without any liability on the part of Westell
Technologies. Nothing herein shall be construed as license or recommendation for use, which infringes upon any
propriety rights of any person. Product material and specifications are subject to change without notice. Westell
Technologies standard terms of sale and the specific terms of any particular sale apply.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 3 of 73
TABLE OF CONTENTS
Preface
Purpose
.............................................................................................................................................................................................................8
Application......................................................................................................................................................................................................8
Document Organization ............................................................................................................................................................................8
Document Conventions .............................................................................................................................................................................9
Product Registration Information.......................................................................................................................................................10
Safety Guidelines.......................................................................................................................................................................................10
Important Safety
Information.................................................................................................................................................................10
Radio
and Television Interference........................................................................................................................................................11
Industry Certifications/Registration Numbers ..............................................................................................................................11
Technical Support......................................................................................................................................................................................11
Acronyms and Abbreviations................................................................................................................................................................11
1
Product Overview
............................................................................................................................ 12
1.1
Product Information .................................................................................................................................................................12
1.2
Functional
Overview...................................................................................................................................................................12
1.3
LED Indicator ................................................................................................................................................................................13
1.4
Local Communication Interface Ports................................................................................................................................13
1.5
EIA232
Pin Specifications .........................................................................................................................................................14
1.6
USB Interface................................................................................................................................................................................14
1.7
Ethernet..........................................................................................................................................................................................14
1.8
Monitoring and Alarms ............................................................................................................................................................14
1.9
Circuit Operational Description............................................................................................................................................15
1.10
Functional Block Diagrams.....................................................................................................................................................15
2
System Optimization Installation
Tips ........................................................................................... 17
2.1
System Setup
Considerations.................................................................................................................................................17
2.2
Suggested Spectrum Analyzer
Setting .................................................................................................................................17
2.3
Important Installation Notes .................................................................................................................................................17
2.4
Installation Tips...........................................................................................................................................................................18
2.4.1
Donor
Antenna .......................................................................................................................................................................18
2.4.2
Antennas...................................................................................................................................................................................18
2.5
Optional Accessories ................................................................................................................................................................19
2.5.1
Outside Donor
Antenna.......................................................................................................................................................19
2.5.2
Inside Omnidirectional
Antenna........................................................................................................................................19
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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2.5.3
Power
Dividers ........................................................................................................................................................................19
2.5.4
Grounding
Kit ..........................................................................................................................................................................19
2.5.5
Lighting Arrestor
.....................................................................................................................................................................19
2.5.6
Directional
Couplers..............................................................................................................................................................19
2.5.7
19” Rack Shelf .........................................................................................................................................................................19
2.5.8
UPS .............................................................................................................................................................................................19
2.5.9
Cross Band Couplers............................................................................................................................................................20
3
Web-based GUI .............................................................................................................................. 21
3.1
Web-based GUI Session..........................................................................................................................................................21
3.2
System
Status ...............................................................................................................................................................................22
3.3
Local Network..............................................................................................................................................................................24
3.4
RF Configuration.........................................................................................................................................................................25
3.5
Program a Filter ..........................................................................................................................................................................26
3.6
Remote Network ........................................................................................................................................................................27
3.7
SNMP
Configuration .................................................................................................................................................................28
3.8
Time
Configuration....................................................................................................................................................................28
3.9
System Health..............................................................................................................................................................................29
3.10
Install and Upload......................................................................................................................................................................30
3.11
Reboot............................................................................................................................................................................................31
3.12
Alarm Configuration .................................................................................................................................................................32
3.13
Email Configuration...................................................................................................................................................................33
3.14
Log Configuration......................................................................................................................................................................34
3.15
Account Credentials..................................................................................................................................................................35
4
Console Interface
............................................................................................................................. 36
4.1
Text Menu Interface (Local Access) ....................................................................................................................................36
4.2
Telnet Session (Remote Access)...........................................................................................................................................40
4.3
Modem Interface (Remote Access with Login) ..............................................................................................................41
4.4
Additional Tips ............................................................................................................................................................................42
Appendix A
Attenuation
and
Dynamic Range
Guidelines................................................................................. 46
A.1
Donor
Port.....................................................................................................................................................................................46
A.2
Server
Port.....................................................................................................................................................................................46
A.3
Dynamic Range Thresholds ...................................................................................................................................................47
A.4
Large Deltas Between In-band and Composite Input Signals .................................................................................47
Appendix B
Band Plans
and
Filter
File
Naming
Conventions............................................................................ 48
B.1
Frequency Band
Plans................................................................................................................................................................48
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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700 MHz Lower A, B and C Band Plan..........................................................................................................................48
700 MHz Upper C Band Plan............................................................................................................................................49
B.1.3
Cellular Frequency Band
Plan .............................................................................................................................................49
B.1.4
AWS Frequency Band Plan................................................................................................................................................50
B.1.5
Canadian PCS Frequency Band Plan..............................................................................................................................50
B.1.6
US PCS Frequency Band Plan...........................................................................................................................................51
B.1.7
Public Safety Bands..............................................................................................................................................................51
B.2
Filter
File
Naming
Conventions ..............................................................................................................................................52
B.2.1
700 MHz Filter Naming
Convention ................................................................................................................................52
B.2.2
Cellular Filter
File
Naming Co
nvent
io
n
.............................................................................................................................53
B.2.3
Canadian PCS Filter
File
Naming
Convention ...............................................................................................................53
B.2.4
US
PCS Filter
File
Naming
Convention............................................................................................................................54
AWS Filter Naming
Convention ........................................................................................................................................56
Appendix C
LTE Attenuator
and
Installation
Notes ........................................................................................... 57
C.1
Important
LTE
Attenuator
and
Installation Notes
-
Donor
and
Server
Isolation ......................................................57
Line of
Sight Propagation Path Loss
Table .....................................................................................................................57
Appendix D
Mechanical and
Electrical Specifications
....................................................................................... 58
D.1
Digital Repeater Mechanical and Electrical Specifications, Original Series.........................................................58
Mechanical
Specifications...................................................................................................................................................58
AC
Power
Specifications......................................................................................................................................................58
Environmental
Requirements ............................................................................................................................................58
Operating Power
Parameters.............................................................................................................................................59
D.2
Digital Repeater Mechanical and Electrical Specifications, Modular Series .......................................................60
Mechanical
Specifications...................................................................................................................................................60
AC
Power
Specifications......................................................................................................................................................60
Environmental
Requirements ............................................................................................................................................60
Operating Power
Parameters.............................................................................................................................................61
Appendix E
Port
Configurations
......................................................................................................................... 62
E.1
Digital Repeater Port Configurations, Original Series .................................................................................................62
Dual-band D2:D1 Port Configuration ...........................................................................................................................62
Dual-band D1:D2 Port Configuration ...........................................................................................................................62
Dual-band D2:D2 Port Configuration ...........................................................................................................................63
Dual-band D1:D1 Port Configuration ...........................................................................................................................63
Single-band D1:D1 Port Configuration........................................................................................................................64
Dual-band D2:S4 Port Configuration............................................................................................................................64
Dual-band D1:S4 Port Configuration............................................................................................................................64
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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Single-band D1:S2 Port Configuration.........................................................................................................................65
E.2
Digital Repeater Port Configurations, Modular Series................................................................................................65
Dual-band D2:D1 Port Configuration ...........................................................................................................................65
Dual-band D1:D2 Port Configuration ...........................................................................................................................66
Dual-band D2:D2 Port Configuration ...........................................................................................................................66
Dual-band D1:D1 Port Configuration ...........................................................................................................................66
MIMO Port Configuration..................................................................................................................................................67
Single-band D1:D1 Port Configuration........................................................................................................................67
Dual-band D2:S4 Port Configuration............................................................................................................................67
Dual-band D1:S4 Port Configuration............................................................................................................................68
Single-band D1:S2 Port Configuration.........................................................................................................................68
Appendix F
Mechanical Configurations........................................................................................................... 69
F.1
Digital Repeater Mechanical Drawings .............................................................................................................................69
DSP85-250 and DSP85-251 Series Mechanical Drawing ......................................................................................69
DSP85-250 and DSP85-251 Series Mounting............................................................................................................70
Appendix G
Glossary........................................................................................................................................... 72
TABLE OF FIGURES
Figure 1-1: DB-9 Pin Descriptions............................................................................................................................................................14
Figure 1-2: Dual Band Functional Block Diagram..............................................................................................................................15
Figure 1-3: Single Band Functional Block Diagram...........................................................................................................................16
Figure 3-1: User Connection Login..........................................................................................................................................................21
Figure 3-2: System Status............................................................................................................................................................................22
Figure 3-3: System Operations..................................................................................................................................................................23
Figure 3-4: Local Network...........................................................................................................................................................................24
Figure 3-5: RF Configuration......................................................................................................................................................................25
Figure 3-6: Program a Filter .......................................................................................................................................................................26
Figure 3-7: Remote Network .....................................................................................................................................................................27
Figure 3-8: SNMP Configuration..............................................................................................................................................................28
Figure 3-9: Time Configuration.................................................................................................................................................................28
Figure 3-10: System Health ........................................................................................................................................................................29
Figure 3-11: Install & Upload.....................................................................................................................................................................30
Figure 3-12: Reboot.......................................................................................................................................................................................31
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 7 of 73
Figure 3-13: Alarm Configuration............................................................................................................................................................32
Figure 3-14: Email Configuration .............................................................................................................................................................33
Figure 3-15: Log Configuration.................................................................................................................................................................34
Figure 3-16: Account Credentials.............................................................................................................................................................35
Figure 4-1: Null Modem Cable..................................................................................................................................................................36
Figure 4-2: Gender Adapter .......................................................................................................................................................................36
Figure 4-3: Tera Term Pro Web Start Up...............................................................................................................................................36
Figure 4-4: Serial Radio Button.................................................................................................................................................................37
Figure 4-5: Setup ............................................................................................................................................................................................37
Figure 4-6: Serial Port Setup......................................................................................................................................................................37
Figure 4-7: TMI Main Menu........................................................................................................................................................................38
Figure 4-8: Adjust Gain.................................................................................................................................................................................39
Figure 4-9: User Gain ....................................................................................................................................................................................39
Figure 4-10: Selecting Filter Programs...................................................................................................................................................40
Figure 4-11: Default IP Address................................................................................................................................................................40
Figure 4-12: Log In Menu............................................................................................................................................................................41
Figure 4-13: Main Menu ..............................................................................................................................................................................41
Figure 4-14: Control Panel..........................................................................................................................................................................42
Figure 4-15: View Network Status and Tasks......................................................................................................................................42
Figure 4-16: Change Adapter Settings...................................................................................................................................................43
Figure 4-17: Local Area Network..............................................................................................................................................................43
Figure 4-18: Internet Protocol Version 4 (TCP/IPv4) ........................................................................................................................44
Figure 4-19: Enter IP Address ....................................................................................................................................................................44
TABLE OF TABLES
Table P-1: Document Conventions............................................................................................................................................................ix
Table D-1: Acronyms and Abbreviations ..............................................................................................................................................72
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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Preface
This Preface includes the following:
Purpose
Application
Document Organization
Document Conventions
Product Registration Information
Safety Notices
Important Safety Information
Radio and Television Interferences
Industry Certifications/Registration Numbers
Technical Support
Acronyms and Abbreviations
Purpose
The
purpose
of this
document
is to
provide
a
step-by-step procedure
to help the
experienced technician/engineer
install
and
commission
an in-building wireless
enhancement
repeater system using Westell Technologies digital
repeaters.
Following the
procedures
outlined will minimize risks
associated
with
modifying
a live system and prevent
service
interruptions.
This
document assumes
the
technician/engineer understands
the basic
principles
and functionality
involved
with
repeater
and
in-building systems.
It is
geared
to the
practical concerns
of the installer.
Application
This
guide should
be
applied whenever
a
need exists
to add
digital repeater capability
to an
existing system
or
when
this
capability
is
being included
with a new installation.
Document Organization
This manual includes the following chapters:
Chapter 1: Product Overview – Provides an Overview of the DSP85 Original Series plus Modular 250 and 251 Series
Chapter 2: System Optimization Installation Tips – Provides information for optimization of using the system
Chapter 3: Web-Based GUI – Provides information on using the system through a web-based graphical user interface
Chapter 4: Console Interface – Provides information on local access to the repeater through console interface
Appendix A: Attenuation and Dynamic Range Guidelines – Provides information on attenuation and dynamic range
guidelines
Appendix B: Band Plans and Filter File Naming Conventions – Provides information on the band plans and filter file
naming conventions
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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Appendix C: LTE Attenuator and Installation Notes – Provides the LTE Attenuator and installation notes including
donor and server isolation
Appendix D: Glossary – Provides a list of acronyms used in this manual
Document Conventions
Table P-1 lists the conventions used throughout this document.
Table P-1: Document Conventions
Convention Description
WARNING! Indicates conditions or practices that could cause personal injury or death. Before you
work on any equipment, be aware of the hazards involved with electrical and RF circuitry
and be familiar with standard practices for preventing accidents.
CAUTION! Indicates conditions or practices that could cause damage to equipment or property, for
indicating information that is crucial to preventing loss of data or damage to hardware or
software, and actions that could result in catastrophic equipment failure.
NOTE Indicates additional information or comments that may be useful to the user.
Bold Bold typeface indicates equipment labels and provides emphasis.
Click Indicates for the user to press the primary (typically left) mouse button while the pointer is
over the specified location.
Right-click Indicates for the user to press the secondary (typically right) mouse button while the
pointer is over the specified location.
Double-click Indicates for the user to press the primary (typically left) mouse button twice, rapidly,
while the pointer is over the specified location.
Select Indicates for the user to perform a selection on the screen by clicking an active object.
Enter Indicates for the user to type text using the keyboard.
> Indicates a level in a menu. For example, Start>Programs prompts the user to click on
Start, then locate and click Programs, under the Start menu.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
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© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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Product Registration Information
The serial
number
may be
found
on the label on the
bottom panel,
near the
power connectors. Write
this
number
in the
boxes shown below. Retain this manual, along with proof
of
purchase, to serve as
a
permanent record
of
your
purchase.
MODEL NUMBER SERIAL NUMBER PURCHASE DATE
POINT OF SALE COMPANY
Safety Guidelines
The general safety
information
in this
guideline
applies to both
operating
and service
personnel. Specific warnings
and
cautions will be found in other parts of this manual where they apply, but may not appear in this summary. Failure to
comply
with these precautions
or
specific warnings elsewhere
in
the manual violates safety standards
of
design, manufacture,
and
intended
use of
equipment.
Westell Technologies
assumes
no
liability
for the
customer’s failure
to
comply
with
these
requirements:
Grounding:
This digital
repeater system
is
designed
to
operate
from
100 - 240
VAC and should always be operated with
the
ground
wire
properly connected.
Do not
remove
or
otherwise alter
the
grounding
lug on the
power
cord.
Explosive atmospheres:
To
avoid explosion
or fire, do not
operate
this
product
in the
presence
of
flammable
gases or
fumes.
Lightning
danger: Do not install or make
adjustments
to this unit during an electrical storm. Use of a suitable
lightning
arrester, such
as
Westell Technologies CSI-CAP,
is
strongly
recommended.
No user
serviceable
parts inside.
Hazardous voltages
are
present
when the cover is
removed. Opening
the
chassis
will
void your
warranty.
If you suspect a
malfunction
with this product, call your dealer or Westell Technologies
technical
support line at 1.877.844.4274
CAUTION!
Power off before connecting/disconnecting cables.
Important Safety
Information
Antennas used
for the
purpose
of
radiating signals indoors
are
limited
to a
maximum
gain of 3 dBi. The
outdoor
antenna
used
for the
purpose
of
communicating
to the
wireless infrastructure
is
limited
to 14 dBi
gain,
or any
combination
of gain
and loss that
equates
to 14 dB at
input.
Each
antenna
must be
positioned
to
observe minimum separation
requirements
from
all
users
and
bystanders.
The
following guidelines should
be
used when considering separation
distances.
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DSP85 Original Series plus Modular 250 and 251 Series
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Indoor antennas
must be
placed
such that,
under normal conditions, personnel cannot
come within 20 cm (~8 in) from
any inside antenna. Adhering to this
minimum separation
will ensure that the
employee
or
bystander
cannot exceed
RF exposures beyond the maximum
permissible
limit i.e. limits for general
population/
uncontrolled
exposure.
Outdoor antenna must
be
positioned
such
that, under normal conditions, personnel cannot approach closer
than 183 cm
(~6 ft).
A
directional antenna having
a
maximum gain
of 14 dBi is
used, precautions should
be
taken
to
prevent
personnel
from
routinely passing through
the main
radiation beam
at a
distance closer
than specified.
Radio
and Television Interference
This
equipment
has been
tested
and found to
comply
with the limits for a Class A digital
device, pursuant
to Part 15 of
the Federal Communications Commissions (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
instruction manual,
may
cause
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 his own
expense.
In order to
maintain compliance with FCC regulations shielded cables must be used with this equipment. Operation with
non-approved
equipment or unshieled cabled
is
likely to result
in
interference to radio and television reception. Changes and modifications
not
expressly approved
by Westell Technologies can void
your authority
to
operate
this
equipment under
FCC rules.
Industry Certifications/Registration Numbers
FCC
NVRCSI-DSP85-C/P, NVRCSI-DSP85201CP, NVRCSI-DSP85-U7C, NVRCSI-DSP85-PS7,
NVRCSI-DSP85-PSS8,
NVRCSI-DSP25XCP, NVRCSI-DSP25XU7C, NVRCSI-DSP25XAWS, NVRCSI-DSP25XS8,
NVRCSI-DSP25XL7
IC
4307A-DSP25XHCP, 4307A-DSP25XS8,
4307A-DSP25XAW
UL
Power supply:
UL60950-1
Technical Support
If you suspect a malfunction with this product or have a technical question, call your dealer or the Westell
Technologies In-Building Wireless Support Line at: (603) 626-6677, Toll Free (USA) 1-877-844-4274, press option 2
Acronyms and Abbreviations
Refer to the Glossary at the end of this manual for definitions of the acronyms and abbreviations used in this manual.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
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© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
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1
Product Overview
1.1
Product Information
Westell Technologies developed its digital repeaters for use within enclosed structures where sufficient signal from
local cell sites to
operate
cell
phones
is
unavailable. Adequate signal must
be
available outside
the
structure
as a
prerequisite
to achieving
in-building coverage.
The digital
repeater
is
connected
to an
external antenna, usually
on the
roof, and to one or more
internal antennas placed strategically throughout
the
area where wireless service
is desired.
The
external
antenna typically is
directional,
such as a Yagi. Internal
antennas
are typically
omnidirectional,
although
various
other
types
may be used
depending
on the
coverage application.
The Westell DSP
repeater amplifies
both the
uplink
(phone
to
tower) and downlink (tower
to
phone) signals thus facilitating communications
to
and from the intended
wireless infrastructure.
With a
maximum
total of 85 dB
nominal
gain on both the uplink and
downlink,
gain can be
adjusted
over a range from
53.5
dB to 85 dB in 0.5 dB
steps. Control
of the
repeater
is
achieved utilizing
a
computer connected
to
COM port
1 or 2 or
via a
crossover Ethernet cable connected
to the
Ethernet
port.
A
specific filtering
process
modifies
each
amplification
chain. This process digitally
converts
the
assigned spectrum
and
then applies digital signal processing (DSP) techniques. DSP
is
used to create passbands that selects the RF energy
passing
through
either the uplink or
downlink
paths. After the digital
processing
is
complete,
the
information
is
converted
back
to an
analog signal
that is
applied
to the
remaining stages
of
amplification.
The
resulting signals emitted
by the
repeater
are specific to the network service
providers’ requirements.
If these
requirements
change, only the DSP
configur
ation
parameters
need
change
in
order
to
adapt. Configuration parameters
are
created
at the
factory
and
supplied
as files that
may be
downloaded
to the
repeater.
The filter set
configurations
stored in
memory determine
the unit’s
adaptability
to
various field applications.
The
appendices describe
the
band plans
as well as the
convention
Westell
uses
to
identify
and
store the
files that make
up the
filter
set. All Westell
repeaters
are
shipped with
an
active filter
set
that
is
programmed
according
to the
ordering parties’
specifications. In
most cases,
the
installer
will not be
required
to
program
a filter.
1.2
Functional
Overview
Westell
digital repeaters incorporate
the
following features
for
convenient operation, access, protection,
and control:
Network configuration
and control using either a Web page style GUI
through
any
standard browser
or a menu
driven user interface using
the
serial port. The
GUI
does
not
require Internet
access
User gain control (affects
all passbands)
Automatic
gain control
Automatic power
control
Overdrive protection
(PA limiting)
Under/Over voltage
protection
Fault
protection
Alarm notification
- local/remote
Upgrade support
- local/remote
External interfaces
- USB/Ethernet/Serial
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DSP85 Original Series plus Modular 250 and 251 Series
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Re-loadable filters
- local/remote
Web-based monitoring
and
control
- local/remote
Persistent status
and
error
information
1.3
LED Indicator
Westell automatic safety precautions are built into the amplifier system. In the case of a catastrophic system event,
a
shutdown circuit
is
incorporated
that will
disable
all
emissions should
the
uplink
input or
downlink
input be
overdriven
or
should
an
oscillation
or
output overpower event occur.
The
amplifier
will
periodically attempt
to
recover from
the detected
condition automatically. Warning
light
indicators
are as follows:
Status
LED:
Blinking yellow:
Unit is
migrating
the
database after
an upgrade
Blinking
red: Unit is
programming
the
filter(s)
and
there
is an error condition
Blinking green: Bootup
or unit is
programming
the
filter(s)
and no error
condition
exists
Solid green:
Unit is
operational,
PA is on
Solid yellow:
Unit is
operational,
but AGC is on
Solid red:
Unit has an
error condition
or PA is off
Dark:
Unit is not powered
The
user may check
the
status page
of the GUI for the
nature
of the fault.
NOTE
On
power
up, the
repeater
will
require approximately three minutes
for the
internal
computer
to
boot. During
this time the LED
labeled Power/Fault
or
Status
will
slowly
blink
green on and off at a rate of
approximately
1 Hz. This will indicate that the unit is in the
boot
up process. Filter configuration file loading will show green light blink 2 seconds
on/three seconds off until finished.
Do not
unplug
the unit
while
it is in the
boot
up process.
1.4
Local Communication Interface Ports
To allow monitoring and control, Westell repeaters are equipped with four ports that provide external communication
access (one Ethernet CAT-5, one DB-9 serial, and two USB). The Ethernet CAT-5 port is provided as a primary
communications port to the PC. One serial interface provides communications to local PC. The USB interface provides
a means to download files from a memory device. The DB-9 pin assignments conform to the standard Electronic
Industries Association (EIA232) specification. A diagram of the pin descriptions are provided in Figure 1-1 for
reference.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 14 of 73
Figure 1-1: DB-9 Pin Descriptions
Connecting a serial cable to the COM port and using a terminal emulation program with a PC will allow
communication to the control processor’s Text Menu Interface (TMI).
1.5
EIA232
Pin Specifications
The connection diagram as shown in
Figure 1-1
is for reference only. It is intended to provide a quick source for pinout
information in the
event
it
should
be
necessary
to
adapt
your
serial cable because
of an
unusual connector
configuration.
In the vast
majority
of
cases
this
information
will not be needed.
1.6
USB Interface
The USB
interface conforms
to
Intel’s universal
host
controller interface
(UHCI)
version
1.1 dated
March
21, 1996. This
interface
will
support
data
transfer rates
up to 12
Mbps
and can be used for
software updates
and
filter
file
uploads.
1.7
Ethernet
The
Ethernet
AUI
conforms
to IEEE
802.3
and is
capable
of
supporting 10/100 Mbps communications speeds.
This port is
used
to
provide access
to the GUI.
1.8
Monitoring and Alarms
The DSP85 Series can be monitored via an Ethernet connection using SNMP, SSH and/or HTTP protocols. Public
safety DSP models have dry contacts for traditional alarm panel monitoring as well.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 15 of 73
1.9
Circuit Operational Description
The
repeater
uses a single
down-conversion/up-conversion scheme.
There are
multiple
RF
amplifier stages
prior to each
down-converting mixer.
The
down-converting mixers
are
followed
by a
single
IF
amplifier.
A
digital signal processor
block
then processes the resultant digitized IF signal that was
previously generated
by an
analog-to-digital converter.
The
processed (filtered) digital signal
is fed to a
digital-to-analog converter and then up-converted
to
RF.
A
driver amplifier
and a
final power
amplifier
make up the final gain stages before
application
to the
diplexer.
The
maximum
total
system
gain
(diplexer
input to
diplexer output)
is
nominally
85 dB for either the
downlink
or the uplink paths with both links having
independent manual
and
automatic gain controls
(AGC).
AGC reacts to analog power
detection
on both the input and output of the uplink and downlink RF chains. A control
algorithm continuously monitors
these
detected
values and
dynamically
adjusts various gain stages such that the net
system gain value, entered manually,
is
optimally maintained without either exceeding
FCC
parameters
or
overdriving
the
A/D converters.
The Status or
Power/Fault
LED will provide
immediate
visual indication of the unit’s primary power alarm status. The
repeater features automatic shutdown protection
as a
safety measure should excessive drive
be
applied
to the
input
or an
oscillation condition occur. When
in a
protected mode,
a
control algorithm determines
the
appropriate method
of recovery
to a
normal, previously defined state,
or
maintains
the
protection
until
manually reset.
If
recovery
has been
established,
the LED will be
illuminated green
or
available
to be
reset.
The
events
that
trigger
the
error
will be
saved
in the
event
log.
1.10
Functional Block Diagrams
Figure 1-2: Dual Band Functional Block Diagram
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 16 of 73
Figure 1-3: Single Band Functional Block Diagram
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 17 of 73
2
System Optimization Installation
Tips
2.1
System Setup
Considerations
All
cables should
be
checked
for
shorts
and opens. V
erify that there
are no
cables
with
loose
or
poor connections.
RF
leakage could cause oscillation
to
occur under some
conditions.
The rooftop antenna (donor antenna),
if
directional, should
be
checked
for
proper alignment along the calculated
compass
heading. Typically,
the
directional antenna would
be
aimed
at the
same
site
that your handset uses,
but it
may
not always be
so. It is
critical
the
installer contact
the
service provider
for
information
on,and
approval
of, the cellsite he or shehas
selected
before
the
system
is
turned
on.
If cables and alignment are
acceptable
and a problem persists, it may be necessary to use a spectrum analyzer to
examine the signal
environment
in which the repeater is
operating.
The
existence
of strong adjacent channel signals
within
the
frequency band(s)
can
cause
the AGC to
reduce
the
amplifier’s
gain or
cause alarms.
In
some cases additional
filtering
or
attenuation might
be
required
to
reject these unwanted signals.
In
some instances,
the
donor antenna
can be
reoriented horizontally,
to
place
the
interference source
in an
antenna pattern
null.
There
also
may
be
some cases
where
the
interference
from
outside signals
is so great that they
cannot
be
filtered
or
otherwise reduced
or
eliminated
without
expensive
and possibly
prohibitive measures.
In these cases it may not be practical to use the
repeater
for providing
coverage
to
these
sites.
2.2
Suggested Spectrum Analyzer
Setting
When
troubleshooting
RF issues, and
surveying challenging
RF
environments,
it is
important
to have a spectrum
analyzer
capable
of
measuring the frequency that you are working with.
An
attenuator should
be
used
to
protect the
input
when
connected
to a
source
of RF
power such
as the
repeater
or a
powered
DAS.
Both uplink and downlink should be measured. Downlink should be measured on the donor cable and at the output
(server)
port of the powered up repeater, and uplink at the lead from the DAS (on
fiber-powered
DAS, where the lead would
connect
to the
server
port on the
repeater)
and at the
donor
port with the
repeater powered
up.
Measurements may
also
be
necessary
at
server antenna locations. The spectrum analyzer
will
need
to be
equipped
with a whip
antenna
for this.
Resolution bandwidth (RBW) should
be set at 200 kHz for GSM and 1 MHz for CDMA. If you
cannot select these
values,
the
closest available values should
be used. Video filter
should
be
about one-tenth
of RBW.
Other settings
like span are
whatever
is
appropriate.
One
should
also
make sure
that
there
are no
signals above
the top of the screen.
If you
cannot
see an
adjacent out-of-band signal
when using the 1 MHz RBW
filter,
you can
decrease
the RBW to see the
close-in-frequency signals.
Be
sure
to set the
RBW back when
you
want
to
measure
the
power
level.
2.3
Important Installation Notes
Inadequate
isolation between the outside and inside antennas may cause
regenerative
feedback in the system. This
feedback
can cause the
amplifier
to emit a
continuous
signal at
maximum amplitude
and, in some cases,
interfere
with
normal operation
of the cell
site. Careful consideration
of the
layout
and
placement
of the
system
is imperative.
The
installer
should refer to the Preface
Safety Guidelines
and
Important Safety Information
for proper
antenna
selection
and
installation.
To avoid
serious
injury or death and
damage
to the
repeater,
do not install donor or
server
antennas near overhead power
lines or high
power components. Allow enough distance
so that if
antennas
should fall
they
will not
come
in
contact
with
those
components.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 18 of 73
Close
proximity to
the donor
or
server antennas with the repeater
in
operation may expose the user
or
installer
to
RF
fields
that
exceed
FCC
limits
for
human
exposure.
WARNING
Amplifier
or
handset damage may occur
if a
handset
is
connected directly
to
the repeater
or
the coax that
leads to the repeater.
2.4
Installation Tips
2.4.1
Donor
Antenna
Accurately
determine the
azimuth
to the
donor
cell
site. Obtain
the
donor
site
information
and
approval from
the
service
provider/carrier.
Ensure
that the
radiation path
to the
donor
cell site is as
unobstructed
as possible.
Mount
the
donor antenna
at or
toward
the
edge
of the
roof,
in the
direction
of the
donor site.
Try to
avoid
having
the RF signal from the
donor
pass
above
the
location(s)
of the
service antennas. Normally
the
service
antennas
will be
behind
and
below
the
donor antenna
if
viewed from above.
This
approach
will help
avoid interference
and
feedback both
to and
from
the
service
antennas.
Normally mounting
the
donor antenna higher
will
allow
a less
obstructed path
to the
donor site. However,
in high
traffic metro areas avoid mounting the donor antenna any higher than necessary
as
the quality
of
the donor
signal
may start
to
become
less
stable
and it is
more likely
to
encounter adjacent channel
interference.
When possible, shield the donor
antenna’s
backside by locating it so that any HVAC units and/or penthouse
structures
are
behind
the
antenna relative
to the
donor
cell site location.
System components should
be
grounded
in
accordance
with NEC
810-15,
21 as required.
2.4.2
Antennas
Use
omnidirectional antennas indoors,
and locate them
centrally
with
respect
to the
intended coverage
area to
minimize
signal
leakage
to the
outside.
Use
directional antennas indoors
only in special cases when
higher
gain
and
directionality would
be
helpful
and RF
exposure limits
will not be exceeded.
To avoid
repeater uplink overload
and gain
limiting, mount
the
indoor antennas
away from areas
where
mobile
subscribers frequently
use
their phones such
as
desks
or
dispatch
areas.
To determine the quantity and locations of indoor antennas, use an appropriate phone’s signal meter to
determine areas of weak signals. These are the approximate areas where indoor antennas may be needed.
Be aware the signal from an indoor antenna, in most cases, can be expected to penetrate about two standard
office sheetrock-type walls to reach users. After two walls, or if the walls are made of other materials,
it may be necessary to split the available signal and add more antennas.
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 19 of 73
2.5
Optional Accessories
A
complete line
of
accessories
is
available from Westell. Check with your Westell distributor for any additional items needed.
Below are just a few
examples suitable
for
most in-building
needs:
2.5.1
Outside Donor
Antenna
PCS -
model number
CSI-AY/1.85-1.99/10
Cellular
-
model number
CSI-AY/806-960/14
2.5.2
Inside Omnidirectional
Antenna
Quad-band
-
model number
ClearLink-O/698-2.7K/N
2.5.3
Power
Dividers
2:1 -
model number
ClearLink -SPD2/698-2.7K-LP/N
3:1 -
model number
ClearLink -SPD3/698-2.7K-LP/N
4:1 -
model number
ClearLink
-
SPD4/
698-2.7K-LP/N
2.5.4
Grounding
Kit
Model number
CSI-GKIT
2.5.5
Lighting Arrestor
Model number
CSI-CAP
2.5.6
Directional
Couplers
6 dB -
model number
ClearLink-DC6/698-2.7K/N
10 dB -
model number
ClearLink -DC10/698-2.7K/N
15 dB -
model number
ClearLink -DC15/698-2.7K/N
20 dB -
model number
ClearLink -DC20/698-2.7K/N
30 dB -
model number
ClearLink -DC30/698-2.7K/N
2.5.7
19” Rack Shelf
Model number CSI-RMS-250
2.5.8
UPS
Battery backup,
two
hour single-band,
one
hour dual-band
-
model number
CS48-985-600
Battery backup,
four
hour single-band,
two
hour dual-band
-
model number
CS48-985-601
Digital Repeater Line
DSP85 Original Series plus Modular 250 and 251 Series
WESTELL.COM
© 2015 Westell Technologies 9 September 2015 Doc. No. 960-1666-MNL rF
1.877.844.4274 Page 20 of 73
2.5.9
Cross Band Couplers
Quad-band Rack Mount
-
model number CSI-CM250-7/C/AW/P (700
LTE,
Cellular,
PCS and AWS)
Quad-band
Wall
Mount
-
model number CSI-CBC/QUAD/N (700
LTE,
Cellular,
PCS and ASW)
Tri-band Rack Mount
-
model number CSI-CM250-U7C/C/P (700 Upper
C LTE,
Cellular
and PCS)
Tri-band
Wall
Mount
-
model number CSI-CBC21/740-1990/N (700 Upper
C LTE,
Cellular
and PCS)
Tri-band Rack Mount
-
model number CSI-CM250-L7/C/P (700 Lower
A/B/C LTE,
Cellular
and PCS)
Tri-band
Wall
Mount
-
model number CSI-CBC21/696-1990/N (700 Lower
A/B/C LTE,
Cellular
and PCS)
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