Westell Inc. CSI-DSP85201CP ユーザーズマニュアル
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Product Introduction
Cellular Specialties, Inc. (CSI) developed the DSP85 and DSP85I 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.
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 omnidirec-
tional, although various other types may be used depending on the coverage application. The CSI DSP
Repeater amplifies both the “uplink” (phone to tower) & “downlink” (tower to phone) signals thus
facilitating communications to and from the intended wireless infrastructure.
tional, although various other types may be used depending on the coverage application. The CSI DSP
Repeater amplifies both the “uplink” (phone to tower) & “downlink” (tower to phone) signals thus
facilitating communications to and from the intended wireless infrastructure.
With a maximum total of +85dB nominal gain on both the up and down links, gain can be adjusted over a
range from +53.5dB to +85dB in 0.5dB 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. There are
also LED indicators near the display to indicate ALARM status, AGC status, UL PWR, DL PWR, OSC,
SHUT DWN and a D/L SIGNAL STRENGTH bargraph.
range from +53.5dB to +85dB in 0.5dB 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. There are
also LED indicators near the display to indicate ALARM status, AGC status, UL PWR, DL PWR, OSC,
SHUT DWN and a D/L SIGNAL STRENGTH bargraph.
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 configuration parameters need change in order
to adapt. Configuration parameters are created at the factory and supplied as files that may be down-
loaded to the repeater. The filter set configurations stored in memory determine the unit’s adaptability to
various field applications. The following pages describe the Cellular and PCS band plans as well as the
convention CSI uses to identify and store the files that make up the filter set. All DSP85-C/P and
DSP85I-C/P 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.
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 configuration parameters need change in order
to adapt. Configuration parameters are created at the factory and supplied as files that may be down-
loaded to the repeater. The filter set configurations stored in memory determine the unit’s adaptability to
various field applications. The following pages describe the Cellular and PCS band plans as well as the
convention CSI uses to identify and store the files that make up the filter set. All DSP85-C/P and
DSP85I-C/P 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.
Terms used in this manual
AGC= Automatic Gain Control
ERP= Effective Radiated Power
APC= Automatic Power Control
FCS= Feedback Cancellation System
AUI= Attachment Unit Interface
FPGA= Field Programmable Gate Array
CPU= Central Processing Unit
LED= Light Emitting Diode
CSI= Cellular Specialties, Inc.
OIP3=
Third-Order Intercept Point
DAS= Distributed Antenna System
RF= Radio Frequency
DHCP= Dynamic Host Configuration SBC= Single Board Computer
Protocol
Protocol
SNMP= Simple Network Management Protocol
DSP= Digital Signal Processing
TMI= Text Menu Interface
EEPROM= Electrically Erasable
USB = Universal Serial Bus
Programmable read-
UHCI = Universal Host Controller Interface
only Memory
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 14dBi gain, or any combination of gain and loss that equates to
14dB 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.
purpose of communicating to the wireless infrastructure is limited to 14dBi gain, or any combination of gain and loss that equates to
14dB 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.
INDOOR antennas must be placed such that, under normal conditions, personnel cannot come within 20 cm (~8.0 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 as defined by section 1.1310 i.e. limits for General Population/Uncontrolled Exposure.
antenna. Adhering to this minimum separation will ensure that the employee or bystander cannot exceed RF exposures beyond the
maximum permissible limit as defined by section 1.1310 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.
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.