Avitec CSFT1922 Users Manual

GSM-EDGE Repeaters

PRODUCT DESCRIPTION AND USER'S MANUAL

4.2 Install the Repeater

Instructions in the left column are fast track instructions and can be used by experienced users. Other users are recommended to read the complete text in this installation guide

4.2.1 Unpack the Repeater

Unpack the repeater

Inspect the shipped material before unpacking the equipment, document any visual damage and report according to routines.

A delivery of a repeater from Avitec contains:

! Checklist with delivered items ! Repeater ! Wall mounting kit or rack mounting kit (defined in order) ! 4 bolts for attaching repeater to mounting kit ! Cable cover ! Keys to repeater and cable cover ! CD containing Product Description and User’s Manual ! Any other specifically ordered item

4.2.2 Mount the Repeater

Mount the repeater on a wall, on a pole or in a rack

Ensure proper ventilation

Mount the repeater in an accessible location and in a location that fulfils the environmental requirements.

The repeater can be mounted on the wall, on a pole or in a 19 inch rack. The Repeater is delivered with a wall mounting kit or a rack mounting kit.

The repeater needs to be mounted tightly to eliminate vibrations

Wall mounting kit Rack mounting kit

Mount the repeater so that heat can be dispersed from it. The repeater wall mounting

kit ensures an optimum airflow between the wall and the repeater itself. Do not block this air channel as it will cause the MTBF of the repeater to drop dramatically, or even in the worst case cause the repeater to fail completely.

If possible use a wall in the shadow to minimize the overall sun loading. If sufficient shielding cannot be obtained, an additional sun shield should be mounted.

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Example of a sun shield

4.2.3 Ensure Proper Grounding

Connect the grounding protection

Ensure that good grounding protection measures are taken to create a reliable repeater site. Make sure to use adequately dimensioned grounding cables. The minimum recommended conductive area for a grounding cable is 16mm

The antenna cabling should be connected to ground every 10m by a reliable grounding kit.

Make sure the grounding product used is suitable for the kind and size of cable being used.

Connect the repeater box bolt to the same ground.

Ground

Ground connector on repeater

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4.2.4 Ensure Good EMV Protection (Lightning)

Caution

If insufficient Electro magnetic Protection is provided,

or if EMV measures are not taken, warranties issued by Avitec are not valid.

Connect the lightning protection

The lightning hazard to electric and electronic equipment consists in the interferences of direct lightning current infections and high surge voltages induced by the electromagnetic field of nearby lightning channels or down conductors. Amplitudes from cloud-to-earth lightning amounts to several 10kA and may last longer than 2 ms. The damage caused depends on the energy involved and on the sensitivity of the electronics systems.

Ensure that lightning protection measures are taken to create a reliable repeater site. Protect all coaxial cables and power cables from the transients caused by lightning. Fit all cables with suitable lightning protection devices.

For detailed information please refer to IEC 61024-1 and 61312-1 for international standards for protection of information systems against LEMP, Lightning Electromagnetic Pulse, including radio transmitters. They define proper planning, installation and inspection of effective lightni ng protection systems.

The top of the mast must be higher than the antennas and be properly grounded

Antennas

The grounding path must have reliable continuity and be correctly dimensioned

Primary Protective Devices

Equipotential Grounding Bars

Repeater

Secondary Protective Devices

Protective Device

The Avitec repeaters comply with the EN standard ETS 301 498-8 which stipulates demands on lightning/surge protection for typical infrastructure telecom equipment installations.

Several lightning protection devices should be used in series with declining threshold voltages to help attenuate the pulse component which makes it through the first layer of protection.

The primary protective device is part of the site installation and is not supplied by Avitec. Coaxial lightning protection is normally one of these three types: Gas

230V AC/48V DC

capsule, High-pass and Bandpass.

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PRODUCT DESCRIPTION AND USER'S MANUAL

There also need to be a protective device installed on the power supply cord.

Protective device installed in connection with the power supply

4.2.5 Attach Antenna Cables

Note! Note!

Attach the antenna cables to the repeater antenna connections

For Frequency Translating Repeaters see also 4.2.8 Mount the Coupler For site installation advice and descriptions of antenna installation see 4.1 Prepare

the Site.

Connectors

The connector to the directional coupler (frequency translating repeaters donor unit) is N-type female. Antenna connections are DIN 7/16” connectors, female.

Compatibility

Make sure that cables and connectors are compatible. Using cables and connectors from the same manufacturer is helpful.

Waterproof all outdoor connections

Connectors

All connectors must be clean and dry Waterproof all outdoor connections using silicone, vulcanizable tape or other

suitable substance as moisture and dust can impair RF characteristics. Make sure enough room has been allocated for the bending radius of the cable. RF

cables must not be kinked, cut or damaged in any way Connect the RF cables to the antennas tightly but without damaging threads Fasten cables tight to cable ladder or aluminum sheet

Cable Dimensions

For short length of feeder cables use ½ “, for longer feeder cables use 7/8”. Chose thicker coax cables for lower attenuation. Minimize the length of the coax cables to reduce the attenuation

Jumper Cables

Use jumper cables for easy installation. The RF Coaxial cable can be substituted at each end with a jumper cable.

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4.2.6 Attach Fiber Cable

Caution

Un-terminated optical receptacles may emit laser radiation.

Do not stare into beam or view with optical instruments.

4.2.6.1 Fiber Connector in the Repeater Casing

Select fibre Connect the fiber

cable

4.2.6.2 Fiber Connector in the Opto Module

Select fibre Insert the fiber

into the repeater via the fitting

Attach the fiber to the connector in the Opto Module

Recommended fiber cable is single mode 9/125.

Connect the fibre directly to the FC/APC connector in the casing.

Note! Clean the fiber connector before it is connected to the Opto module, see

instruction below.

Note! This installation is only suitable for indoor use. The IP 65 classification of the

repeater casing is no longer valid.

Recommended fiber cable is single mode 9/125.

The casing of the repeater is equipped with a Pg connector for attachment of a

corrugated hose (NW 17 mm, outer diameter 21.2 mm). The hose, together with the Pg connector, meet the protection standard IP50.

Supplemented by O-rings, the protection standard IP67 is met.

Make sure the fiber is not too sharply bent. Put the excess fiber cable in soft bends

in the repeater. See illustration. Fasten the cable to make sure it is not damaged when the repeater lid is closed.

Note! Clean the fiber connector before it is connected to the Opto module, see

instruction below.

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Make necessary measurements

Mount the hose to the connector

Seal the hose Seal the hose according to the demands at hand. If the IP classification of the casing

Make necessary measurements to ensure a correct installation.

When the cable has been installed, the quality of the optical path should be checked for optical path loss and magnitude and location of any reflections. This can be done with an Optical Time Domain Reflectometer (OTDR). The total return loss should be > 45 dB.

Optical reflections can degrade the noise and linearity of a fiber optic link. In particular, reflections that reach the laser can be a problem. Keep all discrete reflections to > 60 dB. The FC/APC connectors are polished to a return loss >60 dB.

The casing of the repeater is equipped with a Pg connector for attachment of a

corrugated hose (NW 17 mm, outer diameter 21.2 mm). The hose, together with the Pg connector, meet the protection standard IP50. Supplemented by O-rings, the protection standard IP67 is met.

should be maintained O-rings should be used and both ends of the hose should be sealed with for instance silicon (free of acetic acid).

If necessary to access the repeater end of the hose, the power plinth can be loosened (two screws) and moved forward.

The repeater seen from the inside with the conduit marked by an arrow.

(No fiber is present in this illustration)

Cleaning Optical Connectors

Optical reflections from a discontinuity such as a poor connector interface appear on an RF spectrum analyzer trace as stable variations in the noise floor amplitude that are periodic with RF frequency. If the reflection is bad enough, it could impact the system performance. By far, the most common cause for a large discrete reflection is a dirty optical connector. A bit of dust or oil from a finger can easily interfere with, or block this light. Fortunately, it is very easy to clean the connector.

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Be sure to use the correct procedure for the given connector. When disconnected, cap the FC/APC connector to keep it clean and prevent scratching the tip of the ferrule.

Alternative 1 Swipe the tip of the ferule 2-3 times with a cotton

swab soaked in alcohol. Let it air dry.

Alternative 2 Use a product specially designed for the purpose.

4.2.7 Supply Power to the Repeater

Caution!

The antenna cables must be connected to the repeater before mains power is switched on. Alternatively the

antenna connections on the repeater can be terminated with 50ohm termination plugs.

Note!

Connect the repeater to the power supply

Avitec repeaters can be fed by 110/230 VAC, 50/60 Hz or 48 VDC. Ensure that the

right voltage is used.

Mains power is connected to the repeater via a plinth inside the repeater.

The strain relief fitting is a Pg 13.5 suitable for a 6-12 mm cable diameter.

230VAC or 110 VAC

Connect the power cable to the plinth with the phase linked to the brown cable, neutral linked to the blue and ground to the yellow/green. See illustration below.

Phase

Neutral

Ground

Strain Relief Fitting

Connection Plinth

48 VDC

Connect the power cable to the plinth with negative (-48V) to the uppermost connection and positive (0V) to the middle connection. Leave the lower connection

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empty. See illustration below.

Negative

Positive

-48V 0V

Strain Relief Fitting

Connection Plinth

Recommended cable areas for 48VDC

0 - 10 meters between repeater and power supply

10 – 50 meters between repeater and power supply

Over 50 meters between repeater and power supply

2,5 mm²

4 mm²

Recommendation is to reconfigure the installation, or to make special arrangements to increase cable area

Note!

Back-up battery

Requirements on 48 V power supply

The 48V power supply must comply with SELV requirements, as defined in EN60950, which implies double isolation. The output power needs to be 48VDC +25%/-15%.

For a 2 channel repeater the maximum input current is 8A, for a 4-channel repeater 16A.

In 4-channel repeaters there are two power supplies – one in each part of the box. Each power supply has its own power switch. Both need to be switched on.

Backup Battery

There is a back-up battery installed in connection with the power supply. If there is a power failure the battery will supply enough power for the Control Module in the repeater to send information about the power failure.

The backup battery can be switched on an off separately. The switch is placed adjacent to the mains power switch on the power supply.

In 4-channel repeaters there is a backup battery only in connection to the main power supply unit.

At delivery the back-up battery is connected. It can be replaced by lifting the battery pack out of the crate and disconnecting the cable.

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PRODUCT DESCRIPTION AND USER'S MANUAL

Connector

4.2.8 Mount the Coupler

Caution!

When the coupler is connected the affected base station sector needs to be taken out of service. Turn the base

station off before detaching the cable to the base station cell antenna. It might shut down the whole network –

chose an off-peak time for this installation.

Note!

Mount the coupler

The Coupler is used only in connection with Frequency Translating Repeaters

The connection between the donor unit and the BTS is made using an Avi tec Coupler. The attenuation from the BTS to the repeater is -30 dB. The attenuation through the coupler from the BTS to the antenna is minimal.

Avitec Coupler

The coupler is connected in series with the BTS antenna. J1 and J2 are used for the connection of the coupler in-between the BTS and the cable to the BTS antenna.

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To Antenna

Link Ante nna

RF Coaxial cable

Repeater

7/16 type connector, female

Cap

-30dB Coupler

7/16 type connector

BTS

N-type connector, female

7/16 type connector

N-type connector, female

Coupler connections

J3 or J4 is connected to the repeater donor unit depending on the orientation of the coupler. If J1 is connected to the BTS; J3 is used for connection with the repeater, if J2 is connected to the BTS; J4 is used for connection with the repeater. The connector not used (J3 or J4) must be sealed with a cap to prevent the ingression of dust and water.

! J1 and J2 are DIN 7/16 connectors, one male and one female ! J3 and J4 are N-type connectors, female

1. Disconnect the antenna from the base station

2. Decide whether to connect a filter in series with the antenna cable (between the

coupler and the antenna) to prevent any disturbances from the repeater to reach the antenna

3. Attach the coupler in-between the base station and the antenna cable. (J1 and

J2).

4. Attach the coupler connector closest to the base station to the repeater donor

antenna connector

5. Attach a cap to the connector closest to the antenna connection

6. Turn the base station back on and verify that it is operational.

7. Seal the coupler with rubber tape. Start on the base station antenna cable and

wrap to the base station port cable. Wrap in a circular motion downwards. Cover the coupler and its connecting parts completely. This will provide a weather resistant seal. Complete by adding three layers of PVC tape for UV protection.

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PRODUCT DESCRIPTION AND USER'S MANUAL

4.2.9 Connect External Alarms

Connect external alarms

If the repeater is equipped with an external alarm interface card the connector plinth for the external alarms is located at the bottom of the repeater.

The strain relief fitting in is a Pg 13.5 suitable for a 6-12 mm cable diameter. Connect the alarm cords to the plinth according to the pin layout below (in the

standard version pins 14 – 18 are not used).

Pin # Signal

1 External alarm 1A 2 External alarm 1B 3 External alarm 2A 4 External alarm 2B 5 External alarm 3A 6 External alarm 3B 7 External alarm 4A 8 External alarm 4B 9 Alarm +15V 10 Alarm 0V 11 Relay A 12 Relay B 13 GND 14 NC 15 NC 16 NC 17 NC 18 NC

External Alarm

Four external alarm sources can be connected to the repeater. These alarms operate on a voltage between 12 and 24VDC. The presence or absence of this voltage will trigger the alarm depending on how the alarm polarity has been configured via software.

The alarms can be configured active-low or active-high, so that the alarm is given either in the presence or absence of applied power. Active high means that an applied voltage of between 12 and 24 V will cause the external alarm indicator to turn red. Active low means that when there is no voltage the alarm indicator will turn red.

The repeater can supply +15 VDC to an external alarm source through pin 9 and 10. The maximum allowed load is 50mA.

The repeater contains a relay (pin 11 and 12) that can be connected to an external device to indicate an alarm. The relay can be configured to trigger on any number of internal and external alarms. The maximum current that can be supplied is 50mA.

For configuration of external alarms see section 4.4.4 Alarm Configuration.

4.2.10 Close Repeater

Close repeater Close lid and lock repeater, or continue with the next section: Start-up the Repeater

GSM-EDGE Repeaters

PRODUCT DESCRIPTION AND USER'S MANUAL

4.3 Start-up the Repeater

Caution!

Make sure the antenna cables or 50 ohm terminations are connected to the repeater’s antenna connectors

before the repeater is turned on.

Install the RMC Install the RMC software on a computer from a CD or a diskette. Connect to the LMT

port

Switch the repeater on

Open the repeater and connect the computer to the LMT port via a DB9 male connector with serial RS232 interface.

LMT port

The communication parameters are set automatically by the RMC. Switch the repeater on by using the power switches on the power supply.

Note! See caution above!

Power switches

There are two switches. One is for the battery and one is for the mains.

Note! Always switch on both switches when the repeater should be switched on.

Note!

Check power supply LEDs

The power switch has two positions; “on” and “stand by”. In the stand by position the repeater is still connected to the mains power but not operational.

On 4-channel models both mains power supplies need to be switched on.

Power Supply LED

Check the LEDs on the Power unit and Control Module to ensure that normal operation conditions have been attained.

The power supply has 4 LEDs to indicate the status.

Mains Power

+6V +15V +28V

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LED 1: Mains Power, green

Slow flash Power supply unit operating on AC or DC OFF Power supply unit not oper ating

LED 2: +6V, red

Slow flash (every 10 seconds) +6V power supply operating Quick flash +6V power supply not operating or

operating with malfunction

LED 3: +15V, red

Slow flash (every 10 seconds) +15V power supply operating Quick flash +15V power supply not operating or

operating with malfunction

LED 4: +28V, red Slow flash (every 10 seconds) +28V power supply operating Quick flash +28V power supply not operating or

operating with malfunction

Examples

Mains Power

+6V +15V +28V

LED 1 is flashing slowly, LED 2 – 4 are flashing slowly (once every 10 seconds)

=> power supply unit is operating without problem

LED 1 is flashing slowly, one or two of the red LEDs are flashing quickly

=> Mains power is operating but there is a problem with some of the other voltages

LED 1 is flashing slowly, all of the red LEDs are flashing quic kly

=> Mains power is out and unit is operating on backup battery

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Check Control Module LEDs

Control Module LED

The Control Module has 3 LEDs to indicate the status.

123

LED 1: green

OFF GSM Module switched OFF Permanent ON GSM Module Switched on, not registered on network Slow Flash GSM Module switched on, registered on network

(approximately 1 flash per second)

Quick flash Module switched on, registered on network, call

active (approximately 3 flashes per second)

LED 2: red

OFF Control Module switched OFF Slow Flash Control Module switched on, status OK (once every

10 seconds)

Quick flash Control Module switched on, one or more errors /

alarms detected (except door status)

Check optic module LEDs.

LED 3: blue

OFF Control Module switched OFF, or no one logged in Slow Flash Control Module switched on, nobody logged in

locally OK (once every 10 seconds)

Quick flas h Control Module switche d on, someone logged in

remotely or locally

Opto Module LED

On the optic module there are 4 green LEDs.

TEMP Local temperature in opto

module POWER Power to unit green light = power on OPTO TX Transmitted signal on fiber green light = OK OPTO RX Received signal on fiber green light = OK

green light = OK

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Start the RMC The RMC can be started from the Start menu (or by clicking on the RMC icon, if

made available).

Select “Cable” connection

Select communication port

Enter user name and password

These are the default settings:

User Name Password Authority

USERNAM1 PASSWRD1 read/write USERNAM2 PASSWRD2 read/write USERNAM3 PASSWRD3 read only USERNAM4 PASSWRD4 read only

The system does not differentiate between upper and lower case letters.

Note!

Do not use the number pad when entering numbers.

Failed login attempts are logged. Default maximum number is 8. It is

decremented by one every hour, which means that it takes one hour after the last failed attempt before a new try can be made.

4.3.1 Choose Work View

Choose “Console” mode, “Terminal” mode or “Firmware” mode

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Console mode

The console mode displays a large number of repeater parameters and contains a number of console pages. It adjusts its user interface to adapt to the features of the connected repeater.

Terminal mode

Firmware mode

The terminal mode is used for communication with the repeater using its native command line interface. This interface follows the VT100 standard. For some special actions and error tracing, this mode gives an enhanced availability of the repeater.

The firmware mode is used for monitoring the currently installed software and for uploading new software to the repeater.

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4.4 Configure the Repeater

The following pages will guide you through the configuration of Channel Selective repeaters as well as Frequency Translating repeaters utilizing the Repeater Maintenance Console (RMC) so ft ware.

Configuration of a repeater is made partially on site and partially remotely through the AEM. At site the RF parameters are set and verified, the repeater is given a name (a tag) and the remote communication is set and verified. All other configuration can, and should be made from the AEM.

4.4.1 Set up RF Configuration

4.4.1.1 Channel Selective Re peaters

Ensure online communication with the repeater

This image will appear

Chain 1 Channel number

Uplink

Attenuation Power level

Downlink

Attenuation Power level

Select “Console” mode

Select “RF/Status” window

30 30

OFF

3030

OFFOFF

dBm

Saturation level

Set all power levels

Set “Power Level” in uplink and downlink to “OFF” in all chains

to “OFF”

In the “Power Level” menu the output power can be limited to a specific value or the output power can be switched off completely by choosing “OFF”.

Set all attenuation levels to a maximum

Set “Attenuation” to the maximum value in both chains uplink and downlink

(In a 4 channel repeater there are 4 chains).

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Choose the maximum attenuation value from the drop down menu, in this case 30dB.

Set channel numbers

Monitor the input power

Configure the downlink of Chain1

Set the channel numbers for all chains that are to be used in the installation. In this example the channel in Chain 1 is set to 23 and the channel in Chai n 2 is set to

45.

Note! Chain 1 must a lways contain the BCCH.

Click on the RF Levels icon to monitor the RF levels.

RF Levels icon

Input powe r level in do wnlink chain 1 is -53 dBm

-53

dBm

Input power in the downlink of Chain 1 is dependant on the signal from the serving Base Station, in this example it is -53 dBm

Set “Power Level” in Chain 1 downlink to the desired value, in this example

+37 dBm. This value can be based on a link budget, or be the maximum output the repeater can generate.

Adjust attenuation in the downlink

View the power meter in the top right corner of the screen. In this example the output power is +22 dBm.

Output power levelin downlink

-53

dBm

+ 22

dBm

chain 1 is +22 dBm

Lower the attenuation level step by step until the desired output power level is

reached. In this example +37 dBm. Zero attenuation is the same as maximum gain.

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OFF

The attenuation is adjusted in this box

The desired power level is set in this box

Saturation leve l indicator

-53

dBm

+ 37

dBm

The current output power level is displayed in this box

Note! The accuracy

of this measure is ±2dBm

Also use the saturation level indicator. The saturation level is indicated with plain text as well as with LEDs. The saturation level can be: Low (green), Ok (green), High (yellow) or Critical (red).

The optimal level is Ok, on the verge of High. To reach this value lower the attenuation step by step until the saturation reaches High. Then raise the attenuation one step. The saturation should now be back on Ok.

Note! Since the repeater has an ALC function (Automatic Level Control), the repeater

will not transmit more power even if the attenuation is lowered even more.

Configure the downlink of Chain 2

Configure the uplink of Chain 1 and 2

Apply the same Power Level and Attenuation in downlink Chain 2 as in downlink Chain 1.

The presence of the BCCH in Chain 1 will ensure stable power levels whereas downlink and uplink power levels in Chain 2 will be dependant on the amount of traffic. This will make Chain 2 appear unstable.

In a 4-channel repeater also configure the downlink of Chain 3 and Chain 4.

Note! All channels that are not to be used should always be switched off (set Power

Level to “OFF”.)

Set the Power Level for the uplink in Chain 1 and Chain 2 to the same value as for the

downlink, in this example +37dBm, or any other level decided in the link budget. Set the Attenuation 2dB higher than in the downlink. In this example 16dB (14dB +

2dB) In a 4-channel repeater also set the uplink for Chain 3 and Chain 4 Since the BTS is more sensitive than a mobile unit there may be less signal gain from

the mobile unit in to the BTS (UL) than in the opposite direction. The uplink attenuation can be adjusted more accurately later on, once the drive test signal measurements have been completed.

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Make an antenna

See 4.1.3 Antenna Isolation

isolation test

4.4.1.2 Frequency Translating Repeaters

Start with the donor unit

The Single Donor (SD) and Double Donor (DD) units are configured in the same way.

Ensure online communication with

Select “Console” mode

the repeater

This image will

Select “RF/Status” window

appear

Chain 1

Channel number Link channe l

23 4512

30 30

OFF

Link Ch

OFF

Link Ch

Uplink Attenuation Power Level

Downlink

Attenuation Power Level

Saturation Status

Set all power levels to “OFF”

Set all attenuation levels to a maximum

3030

OFFOFF

Set “Power Level” in uplink and downlink to “OFF” in all chains

In the “Power Level” menu the output power can be limited to a specific value or the output power can be switched off completely by choosing “OFF”.

Set “Attenuation” to the maximum value in both chains uplink and downlink.

Choose the maximum attenuation value from the drop down menu, in this case 30dB.

Set channel numbers

Set the channel numbers for all chains that are to be used in the installation. In this example the channel in Chain 1 is set to 23 and the channel in Chai n 2 is set

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to 45.

Note! Chain 1 must a lways contain t he BCCH.

Set Link channel numbers

View the input power

Configure the downlink of Chain1

Set the Link channels to the desired values. In this example channel 12 in Chain 1

and channel 39 in Chain 2.

Click on the RF Levels icon to monitor the RF levels.

RF Levels icon

Input power level in downlink chain 1 is +13 dBm

+ 13

dBm

The input power in the downlink of Chain 1 is in this example approximately +13dBm (output power of the BTS -30dB from the coupler)

Set “Power Level” in Chain 1 downlink (the link) to the desired value, in this

example +37 dBm. This value can be based on a link budget and depends for instance on the distance to the remote unit.

View the power meter in the top right corner of the screen. In this example the output power is +22 dBm.

Output power lev elin downlink

+ 13

dBm

+ 22

dBm

chain 1 is +22 dBm

Adjust attenuation in the downlink

Lower the attenuation level step by step until the desired output power is reached. In

this example +37 dBm. Zero attenuation is the same as maximum gain

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Link Ch

OFF

+ 13

dBm

+ 37

The attenuation is adjusted in this box

The desired power level is set in this box

Saturation level indicator

dBm

The current output power level is displayed in th is b o x

Note! The accuracy

of this measure is ±2dBm

Also use the saturation level indicator. The saturation level is indicated with plain text as well as with LEDs. The saturation level can be: Low (green), Ok (green), High (yellow) or Critical (red).

Note! Since the repeater has an A LC function ( Automatic Leve l Control), the

repeater will not transmit more power even if you continue to lower the attenuation.

Configure the downlink of Chain2

Configure the uplink in Chain 1 and 2

Continue wit h the remote unit

Apply the same Power Level and Attenuation in downlink Chain 2 as in downlink Chain 1.

Note! All channels that are not to be used should always be switched off. (Set Power

Level to “OFF”.)

Set the Power Level for the uplink to -10/-13/-15 dBm depending on the site design,

for instance the number of sectors in the BTS and the level of noise allowed. Set the Attenuation 2dB higher than in the downlink. In this example the attenuation

in the uplink is set to 16dB (14dB + 2dB= 16dB) Since the BTS is more sensitive than a mobile unit there may be less signal gain

from the mobile unit in to the BTS (UL) than in the opposite direction. The uplink attenuation can be adjusted more accurately later on once the drive test signal measurements have been completed.

The configuration of the Remote Unit is almost identical to the configuration of the Donor Unit apart from the gain and output power settings.

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Set all power levels to “OFF”

Set all Attenuation levels to a maximum

Set channel numbers Set link channel

numbers View the input

power in the downlink

See instruction for donor unit above

Set the same channel numbers as for the donor unit. Set the same link channel numbers as for the donor unit.

Click on the RF Levels icon to monitor the RF levels.

RF Levels icon

Input power level in downlink Chain 1 is -65 dBm

-65

dBm

The input power in the downlink of Chain 1 is in this example approximately

-65dBm.

Note! The input signal level will vary between different repeater installations

depending on the distance between the Donor Unit and the Remote Unit and other parameters affecting the signal’s propagation.

Configure the downlink of Chain1

Adjust attenuation in the downlink

Configure the downlink of Chain2

Configure the uplink in Chain 1 and Chain 2

Set “Power Level” in Chain 1 downlink to the desired value, in this example

+43 dBm. This value can be based on a link budget, or be the maximum output the repeater can generate.

Lower the attenuation level step by step until the desired output power is reached. In

this example +43 dBm. See instruction for donor unit above

Apply the same Power Level and Attenuation in downlink Chain 2 as in downlink Chain 1.

Note! All channels that are not to be used should always be switched off. (Set Power

Level to “off”.)

Set the Power Level in the uplink of both Chain 1 and 2 (the link) to +37 dBm (the

same as for downlink in the donor unit). Set the Attenuation 2dB higher than in the downlink.

+ 51 hidden pages

Avitec CSFT1922 Users Manual

Specifications and Main Features

Frequently Asked Questions

User Manual