CSI CSI-DSP85-250-L7, Product Manual

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Notes
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AGC = Automatic Gain Control ERP = Effective Radiated Power
APC = Automatic Power Control FPGA = Field Programmable Gate Array
AUI = Attachment Unit Interface LED = Light Emitting Diode
CPU = Central Processing Unit OIP3 = Third-Order Intercept Point
CSI = Cellular Specialties, Inc. RF = Radio Frequency
DAS = Distributed Antenna System SBC = Single board Computer
DHCP = Dynamic Host Confi guration SNMP = Simple Network Management Protocol
Protocol TMI = Text Menu Interface
DSP = Digital Signal Processing USB = Universal Serial Bus
EEPROM = Electrically Erasable UHCI = Universal Host Controller Interface
Programmable read-
only Memory
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 fol-
lowing guidelines should be used when considering separation distances.
INDOOR antennas must be placed such that, under normal conditions, personnel cannot come within 51 cm (~20.0 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 defi ned 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 pass-
ing through the main radiation beam at a distance closer than specifi ed.
Product Introduction
Terms used in this manual
Important Safety Information
Cellular Specialties, Inc. (CSI) developed the DSP85-250, DSP85-251, DSP85I-250 and DSP85I-251 digital repeaters for use
within enclosed structures where suffi cient 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
CSI DSP Repeater amplifi es 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 +85 dB 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.
A specifi c fi ltering process modifi es each amplifi cation chain. This process digitally converts the assigned spectrum and then ap-
plies 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 amplifi cation. The resulting signals emitted by the repeater are specifi c to the network
service providers’ requirements. If these requirements change, only the DSP confi guration parameters need change in order
to adapt. Confi guration parameters are created at the factory and supplied as fi les that may be downloaded to the repeater.
The fi lter set confi gurations stored in memory determine the unit’s adaptability to various fi eld applications. The following pages
describe the band plans as well as the convention CSI uses to identify and store the fi les that make up the fi lter set. All CSI re-
peaters are shipped with an active fi lter set that is programmed according to the ordering parties’ specifi cations. In most cases,
the installer will not be required to program a fi lter.