Amphenol Procom CSR-DMT User manual

User Manual
CSR-DMT
channel selective digital TETRA repeater

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CSR-DMT
channel selective digital TETRA
repeater
Rev 3-NM, Issued Nov. 2017

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TABLE OF CONTENTS
TABLE OF CONTENTS...............................................................................................................3
CONTACT INFORMATION..........................................................................................................4
1.0 GENERAL INFORMATION.................................................................................................... 4
1.1 Abbreviations.....................................................................................................................4
1.2 Warnings............................................................................................................................5
1.3 Purpose.............................................................................................................................5
2.0 HARDWARE DESCRIPTION.................................................................................................6
2.1 Block diagram....................................................................................................................6
2.2 Filters characteristics.........................................................................................................6
2.4 Hardware AGC .................................................................................................................. 9
2.5 Connectors, indicators, buttons.........................................................................................9
3.0 INSTALLATION.....................................................................................................................11
3.1 Mechanical installation......................................................................................................11
3.2 Electrical installation........................................................................................................12
3.4 Driver installation............................................................................................................. 12
4.0 CONTROL SOFTWARE...................................................................................................... 12
4.1 System requirements....................................................................................................... 12
4.2 Overview..........................................................................................................................12
4.3 Establishing a connection................................................................................................ 12
4.4 Configuration interface.....................................................................................................13
4.7 Firmware upgrade............................................................................................................ 14
5.0 APPENDIX...........................................................................................................................15
5.1 Technical specifications...................................................................................................15
5.2 CSR-DMT view................................................................................................................ 16
COPYRIGHT ............................................................................................................................. 16

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CONTACT INFORMATION
Procom A/S
Address:
Smedetoften 12
3600 Frederikssund
Denmark
Phone: [phone]
Web: www.amphenolprocom.com
1.0 GENERAL INFORMATION
1.1 Abbreviations
ADC Analog to Digital Converter
AGC Automatic Gain Control
BTS Base Transceiver Station
DAC Digital to Analog Converter
DL Downlink
ESD Electrostatic Discharge
ETSI European Telecommunication Standards Institute
GPRS General Packet Radio Service
GSM Global System for Mobile Communications
GUI Graphical User Interface
IF Intermediate Frequency
LED Light Emitting Diode
LNA Low NoiseAmplifier
LO Local Oscillator
LTE Long Term Evolution Mobile System
MCU Main Controller Unit
OIP3 Output Intercept Point of third order
OutP1dB Output Compression Point at 1dB
PA PowerAmplifier
PM Power Meter
PSU Power Supply Unit
Rev Revision
RF Radio Frequency
RSSI Receive Signal Strength Indicator
RTC Real Time Clock
SMS Short Message Service
TETRA Terrestrial Trunked Radio
UL Uplink
UMTS Universal Mobile Telecommunication System
USB Universal Serial Bus
VCO Voltage Controlled Oscillator
VSWR Voltage Standing Wave Ratio
WCDMA Wide-band Code Division MultipleAccess

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1.2 Warnings
Only qualified personnel can work with this unit.
Before using read all given specifications and manuals. Using the unit follow the recommendations and
rules given in the related documents.
Keep operating manual within easy reach and make them available to all users.
It's the responsibility of the network provider to implement preventing measures to avoid health hazards
that may be associated with radiation from the single or multiple antennas connected to the unit.
Installing and using the unit follow all obligatory regional regulations.
Use this unit only for the purpose specified by the manufacturer.
ESD precautions must be observed.
Make sure the unit settings are in accordance with the intended use and regulatory requirements.
1.3 Purpose
The full band repeater CSR-DMT is a bi-directional digitally controlled amplifier that offers an increase of
signal strength in small and medium-sized rooms.
Generally TETRA repeaters are used in emergency services and government systems to provide signal
coverage for areas with poor or no signal (e.g. blind spot). Procom A/S came across the insufficient
coverage within buildings, airports, tunnels, etc. The digital repeater CSR-DMT series can solve these
problems by amplifying the available signal from an outdoor antenna into weak coverage areas via an
antenna or indoor delivery network with multiple antennas.
CSR-DMT is based on a digital filtering approach thanks to that the CSR-DMT is very flexible in
continuously changing conditions of mobile communication systems. The digital filter can be reconfigured
in a custom desired way:
•Full band (5 MHz) is default configuration (factory settings)
•Additionally it is possible to adjust bandwidth and center frequency of band-segment
•Possible number of band-segments is 1-4
•adjustable gain of individual band-segment
Built-in Automatic Gain Control circuit prevents the occurrence of undesired oscillations, signal
compression and distortion conditions.

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2.0 HARDWARE DESCRIPTION
2.1 Block diagram
Presence of various nodes can be different for different ordering options of CSR-DMT.
2.2 Filters characteristics
In this section digital filter characteristics are described. Digital filter node is purely software based, thanks
to that it is possible to reconfigure selective filters in a desired way without any change to the hardware. In
the next picture some examples of possible filter configuration are given.
Each direction can have up to four band-segments. Each segment bandwidth can be selected from a
range of 25 kHz up to 5 MHz. Bandwidth adjustment steps for bands 25 kHz up to 1MHz is 25 kHz.
Bandwidth adjustment steps for bands 1.1 MHz up to 5 MHz is 100 kHz.
Filters have selectivity properties according to ETSI TETRA standards. All filters can be divided into two
different groups. Filters from first group have better selectivity.
Table 1. Filter groups
Group number
Passband
1
25 kHz - 1 MHz (step 25 kHz)
2
1.1 MHz - 5 MHz (step 100 kHz)
Figure 1. CSR-DMT block diagram

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If needed the repeater pass band can be constructed from two or more segments. For instance using
such a composite method with filters from group 1 (see table above) it is possible to make wideband filter
with best selectivity properties.
Applying composite method it must be taken into account the real transition band in amplitude-frequency
response of the filter. Putting filters pass-bands in “edge to edge” style there will exist a high probability to
get distortions in amplitude and phase of composite filter. To smooth such effects it is recommended to put
particular segments with small offset 50 - 400 kHz. For best modulation performance do not use
composite bands.
Below different examples of bandwidth filters are shown. All filters are demonstrated in base-band with
half-bandwidth. Due to digital nature filter shapes are stable and symmetrical over entire frequency range.

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Figure 3. One 25 kHz segment
Figure 4. One 100 kHz segment
Figure 5. One 5 MHz segment

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2.4 Hardware AGC
Hardware automatic gain control (AGC) circuit is intended to prevent undesired oscillations and spurious
emissions. The repeater can experience oscillating conditions due to wrong installation factors like small
isolation between outdoor donor and indoor coverage antenna isolation. In the case of too high input
signal hardware AGC limits the total output power to a value in dBm specified for each model.
Two orange LEDs (DL and UL separately) show the activity of hardware AGC. If they are active, input
signal is too high or repeater is oscillating.
In case of higher input signal built-in additional digital step attenuator can be used to decrease gain of the
repeater. Also using directional donor antenna or a different faraway BTS could be chosen.
2.5 Connectors, indicators, buttons
SMA connector has a torque 0.5 N/m. N-type connectors have a torque 1.3 N/m. Use appropriate tools
when working with these connectors.
For installation convenience control part (LEDs, USB, RESET button) is placed on inside of the CSR-DMT
in front position. On bottom side of the CSR-DMT RF connectors, power supply input and other additional
connections are placed.

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Figure 6. CSR-DMT bottom view and top view