Westell Inc. CSI-DSP85201CP ユーザーズマニュアル
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).
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 maintained without
either exceeding FCC parameters or over driving the A/D converters.
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 maintained without
either exceeding FCC parameters or over driving the A/D converters.
LEDs on the front panel display provide immediate visual indications of the unit’s primary power and
major or minor 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 associated LED(s) will either be extinguished or available to be reset. The events
that trigger the error will be saved in the event log.
major or minor 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 associated LED(s) will either be extinguished or available to be reset. The events
that trigger the error will be saved in the event log.
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Optional Accessories
A complete line of accessories is available from Cellular Specialties, Inc. Check with your CSI distributor
for any additional items needed. Below are just a few examples suitable for most in-building needs.
•Outside Donor Antenna
•UPS
PCS - model number: CSI-AY/1.85-1.99/10
Battery backup, 2 hr Single band
Cellular - model number: CSI-AY/806-960/14 1 hour dual band - model number: CS48-985-600
•Inside Omnidirectional Antenna
Quad-band - model number: CSI-AO/700/2.5K/3 Battery backup, 4 hr Single band
•Power Dividers 2 hour dual band - model number: CS48-985-601
2:1 - model number: CSI-SPD2/700-2.5K/N
•Inside Omnidirectional Antenna
Quad-band - model number: CSI-AO/700/2.5K/3 Battery backup, 4 hr Single band
•Power Dividers 2 hour dual band - model number: CS48-985-601
2:1 - model number: CSI-SPD2/700-2.5K/N
3:1 - model number: CSI-SPD3/700-2.5K/N
•Mounting Kit
4:1 - model number: CSI-SPD4/700-2.5K/N 19” rack or wall mountable -
•Grounding Kit - model number: CSI-GKIT model number: CSI-RWM-DSP85
•Lightning Arrestor - model number: CSI-CAP
•Directional Couplers
6dB - model number: CSI-DC6/700-2K/N
•Grounding Kit - model number: CSI-GKIT model number: CSI-RWM-DSP85
•Lightning Arrestor - model number: CSI-CAP
•Directional Couplers
6dB - model number: CSI-DC6/700-2K/N
10dB - model number: CSI-DC10/700-2K/N
15dB - model number: CSI-DC15/700-2K/N
20dB - model number: CSI-DC20/700-2K/N
30dB - model number: CSI-DC30/700-2K/N
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.
•
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 Safety Guidelines section on page 4 and the Important Safety
Information section on page 5 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.
•••••
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.
•••••
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.