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19 BSS9061 Temperature control system

19 BSS9061 Temperature control system

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Flexi EDGE BTS Feature Descriptions



5.20



BSS9060 TRX Test

The total performance of the TRX is tested with a multi-purpose TRX Test. The test

covers:









Digital and RF parts

RX operation and TX level

Both RX branches



The TRX test time is approximately 15 seconds.

When the TRX test is carried out according to a regular schedule, it can be used in TRX

performance supervision.

Both RX branches are tested separately during the same TRX test. If diversity is not configured, only the main branch is tested.

The TRX Test tests both the Tx and Rx RF paths of the selected TRX via an uplooped

burst to the Air interface, including the Dual TRX Module (EXxx) and Dual Duplexer

Module (ERxx) or Remote Tune Combiner Module (ECxx). The looped back signal is

fed back to the Rx path where the BER, Rx Level and Rx Result are measured. The

reported Tx power is derived from the received RX level.

The TX power level used during the TRX test is the same as the power level of the

broadcast control channel (BCCH). To avoid unwanted disturbances to the TRXs, the

training sequence is not the same as the one normally used.



Exxx generates

TX transmission



RF



TX A

TxA



Ext A

RXA O



TxB



RXA I

RXA

1...4



MRX1

Rx1

FSH



Power supply

and

digital I/O



RxA

RX signal is sent to



4UD



RxAdiv Exxx RX for signal



level measurements



DRX1

No/2UD



RXB

1...4

RxB



TX signal is

down

converted

to relevant

RX frequency



Ext B

TX B



Rx2

FSH No/2UD



RxBdiv

DRX2

4UD



Figure 8



g



66



TRX Test block diagram



Reported TX Power result is indicative only and a certain tolerance (up to +/- 6 dB

compared to the actual value) can be expected. If the exact TX output power needs to

be known, it must always be measured with external and calibrated test equipment.



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Flexi EDGE BTS Feature Descriptions



g



Reported RX Result is not based on BER so it does not measure the absolute sensitivity

of the TRX. If the exact sensitivity needs to be known, it must always be measured with

external and calibrated test equipment.



Figure 9



TRX Test window



All TRXs in the BTS can be tested either remotely from the BSC or the NetAct or

locally/remotely with Flexi EDGE BTS Manager. If the TRX test which is run from NetAct

or the BSC fails, the test must be rerun remotely or locally with BTS Manager. The

detailed failure reasons can be obtained from the 2G Flexi BTS Site Manager and from

BSC if the feature "RG301831 Enhancement on TRX Test" is activated. Troubleshooting instructions for these failure reasons can be found in the document, Trouble Management of Flexi EDGE BTS.

It is possible to run the TRX Test after the TRX object is blocked from the BTS Manager.

With EP2 CD1.0 (and later BTS SW releases), it is also possible to run the TRX Test

after the TRX object is locked from the BSC.

Note that the TRX test can be performed only in traffic channel (TCH) timeslots. Two

free timeslots are needed for the test.

The TRX test is not possible when baseband or antenna hopping is used.

Also TRX Test cannot be commanded for a TRX configured to cover the extended/super

extended outer area.



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Flexi EDGE BTS Feature Descriptions



5.21



TRX Loop Test

Flexi EDGE BTS provides a TRX Loop Test facility. In a TRX loop test, data generated

by SW in digital parts of the TRX is looped from the TX to RX side inside the Dual TRX

module (EXxx) and the Dual Duplexer Module (ERxx) or the Remote Tune Combiner

Module (ECxx), so that the TX and RX chains excluding antennas and antenna feeder

cables are tested. Main or diversity paths can be tested.

The BTS checks the looped test data, and the test result is given as BER values.

The TRX Loop Test can be performed with GMSK TCH/FS or 8PSK PDTCH/MCS-5 test

channels.



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Flexi EDGE BTS Feature Descriptions



5.22



BSS9059 BTS resets

You can separately trigger a reset of BCF, BTS or TRX objects. An object reset can be

triggered from the BSC, NetAct and from Flexi EDGE BTS Manager. In addition, the

Flexi EDGE BTS Manager can also command HW resets for the System Module

(ESMA) and Dual TRX Module (EXxx).

Object resets











BCF (site) reset: resets all modules/units in the site except transmission submodules (FIxA), which ensures that active cross-connections are not interrupted.

BTS (sector) reset: resets a single BTS object, including all TRXs that are part of

the BTS object configuration. It has no impact on other BTS objects which are part

of the site.

TRX reset: resets a single TRX. Only the targeted TRX object is impacted.



Module resets

Module resets are provided as a recovery mechanism for exceptional conditions. In

normal operation, there should be no need to invoke this type of reset.









System Module reset: reinitialises all hardware and software in the System Module.

This is equivalent to a power on reset. Transmission is also re-initialised, and there

will be a brief interruption in the cross-connect traffic.

Dual TRX Module reset: reinitialises all hardware and software in the targeted Dual

TRX Module. Both TRX objects mapped to the Dual TRX Module are affected.



You can also issue a specific sector or BCF object reset from Flexi EDGE BTS Manager

to force the RF Cable Auto-detection to the reset sector object, or to the whole BTS (all

sectors). For more information on RF Cable Auto-detection, see section Auto-detection

of Site Configuration and RF Cable Auto-detection.



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Flexi EDGE BTS Feature Descriptions



5.23

5.23.1



BTS Auto-detection

BSS9056 Auto-detection of Site Configuration

Flexi EDGE Base Station detects the site configuration automatically, including all active

modules and versions, their serial numbers and the frequency band used. This information is stored in the flash memory of the System Module (ESMA), and it can be displayed

in Flexi EDGE BTS Manager.

The user needs to set the operator-specific settings, such as external alarm line settings,

from the BSC or the NetAct, for example with the Remote MML session.

A possible change in any of the modules or in the configuration causes an automatic site

configuration update in the flash memory of the System Module. The configuration is

detected both in normal start-up situations and when extra capacity (more TRXs) is

added, modules are removed, or a faulty module is replaced with a new one.

The transmission configuration is part of the site configuration file (SCF), which is stored

in the System Module.

There is no auto-detection for the following units/modules: mast head amplifier, power

modules, and Wideband Combiner Sub-module (EWxx).



5.23.2



RF Cable Auto-detection

The RF Cable Auto-detection (RFCAD) feature enables the auto-detection of RF cables

connected between the Dual TRX Modules (EXxx) and the Dual Duplexer Modules

(ERxA) or Remote Tune Combiner Modules (ECxA), when a sector or the BCF comes

up after reset, and the prerequisites for RF Cable Auto-detection are fulfilled.

The configurations for which the RF cabling is automatically detected are listed in the

Flexi EDGE BTS Commissioning document, Appendix RF auto-detection supported

configurations.

Functionality of RF Cable Auto-detection

A TRX starts to transmit a TX test signal, which the TRX loop module in the Dual

Duplexer or Remote Tune Combiner Module down-converts to a corresponding RX frequency. The TRX loop switch then sweeps through all RX ports and the TRXs listen for

the received signals (see figures TRX loop (Dual Duplexer Module) and TRX loop

(Remote Tune Combiner Module)).



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Flexi EDGE BTS Feature Descriptions



TX signal is

coupled off TX

path



EXxx generates TX

transmission



TX A



Bias

Tee/

VS WR

alarm



Ext A



RX Signal is sent to

EXxx RX for signal

level measurements



ANT A



RXA O

RXA I

RXA

1...4



TRX Loop



Down converted

signal is swept

through all RX paths



Gain /

alarm

logic



Power

Supply &

Digital I/O



Digital

logic



TX Signal is

down converted

to relevant RX

frequency



RXB

1...4

Bias

Tee/

VS WR

alarm



Ext B

TX B



ANT B



CoRx out



DN70292782



Figure 10



TRX loop (Dual Duplexer Module)



TX

EXxx generates TX

transmission



TX

1...6



TX Signal is

coupled off

TX path



Bias

Tee/

VS WR

alarm



RXEO

RX

1...3



Down converted

signal is swept

through all RX paths

RX Signal is sent to

EXxx RX for signal

level measurements



TRX

Loop



RX

RX

4...6



TX / RX

ANT



TX Signal is

down converted

to relevant RX

frequency



Bias

Tee

Tee



RX ANT



RXEI



DN70292779



Figure 11



DN70124104



TRX loop (Remote Tune Combiner Module)



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Flexi EDGE BTS Feature Descriptions



The BTS software determines the connectivity between the Dual TRX Module and the

Dual Duplexer or Remote Tune Combiner Modules based on the analysis of the RX

measurement reports received from the Dual TRX Modules.

At the BCF start-up, BTS SW shall sweep through the Tx and Rx paths of the DDUs

even if any Tx path has already been associated with an existing sector. This would

enable the RFCAD to detect Tx and Rx cables for DDUs which are shared across two

sectors. Furthermore, there may be several Rx cables shared (= flyover Rx cables)

between another DDU that is associated to the same sector as the DDU to which the

local Tx is associated to.

The RFCAD is attempted sector-wise and on each attempt the previously detected RF

cabling is cleared. Even if the operator has not modified any physical cabling and

attempted the RFCAD on a sector which shares a DDU with another sector, TRXs

having Tx and Rx cabling with the shared DDU between two sectors will have their RF

cabling information cleared. This will result in appropriate alarms on these TRXs. To

correct the situation (in case of a shared DDU), the operator needs to do a BCF reset

with the RFCAD, in which case all the cables will be successfully detected as connected.

When the BTS software cannot decide on the presence of the RF cables based on the

received reports, the BTS software starts, for example, one of the following alarms on

the relevant TRX objects:







7606 TRX Faulty (for example 'EXxx TRX module detected no connection to ERxx

DDU via RF cable autodetection')

7607 TRX Operation Degraded ('EXxx TRX module detected only one Rx signal

during RF cable autodetection')



The following RF connectivity can be auto-detected:













Tx cables between the Dual TRX Modules and Dual Duplexer Modules.

The Wideband Combiner Sub-modules (EWxx) are included in the detection

process but they are not shown in the Flexi EDGE BTS Manager as separate

objects.

Tx cables between the Dual TRX Modules and Remote Tune Combiner Modules.

Main and diversity Rx cables between the Dual TRX Modules and Dual Duplexer

Modules.

Main and diversity Rx cables between the Dual TRX Modules and Remote Tune

Combiner Modules.



Prerequisites for RF Cable Auto-detection











72



The Abis connection to the BSC must be available, and the BCF must be configured

at the BSC (that is, the 'BTS_CONF_DATA' is received).

The TRX and BTS object(s) are not locked or blocked (manually or because of a

blocking alarm). However, in commissioning phase the TRX and BTS object(s) can

be locked.

RF cables were not defined manually during commissioning.

This user selection is stored in the site configuration file (SCF) in the System

Module's (ESMA) non-volatile memory, and you can check it with the Flexi EDGE

BTS Manager as follows: Commissioning→ Fetch SCF from BTS... Detail tab. In

the detailed view, locate the line containing 'rfCablingSource', which can have two

values:

• 'AUTODETECTED': RF Cable Auto-detection was used during commissioning

or



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Flexi EDGE BTS Feature Descriptions







'SCF': RF cabling was entered manually during commissioning (which means

that RF Cable Auto-detection was not used during commissioning and cannot

be used later on either)



If all the three prerequisites are met, the RF Cable Auto-detection is run, when:













5.23.3



The BTS_CONF_DATA is received in the commissioning phase.

There are changes to the configuration: added/deleted TRXs or sectors, and then a

BTS/BCF reset for the affected sectors. (The receive of a new BTS_CONF_DATA

in an already commissioned site is not enough to start the RFCAD.)

A BTS or BCF reset is given, and the previous RF Cable Auto-detection on a BTS

(sector) had partially failed.

A BTS or BCF reset is given (from the Flexi EDGE BTS Manager) with the 'With RF

detection' option (the so-called ‘forced RFCAD’).



Internal power cable Auto-detection

During BTS commissioning an internal power cabling test is automatically performed to

verify that the power cabling from the System Module (ESMA) to the corresponding Dual

TRX Module (EXxA) is correct in the BTS configuration and is as specified in the power

cabling rules. If the internal power cabling validation fails, then an Alarm 7601 "Module

power cable connections are incorrectly configured" is started directly after the BTS

commissioning has been completed.

Incorrect internal power cabling will directly affect the Intelligent shutdown feature

(BSS11047) that requires that the internal power cables are connected as per the power

cabling rules to function correctly.

Note that the internal power cabling verification only takes place during the BTS first

commissioning or a complete BTS re-commissioning.



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Flexi EDGE BTS Feature Descriptions



5.24



Optical Converter Module (EOCA) autodetection and

runtime polling

All Optical Converter Modules (EOCA) are autodetect. The BTS Manager is able to

obtain information about the local and remote EOCA(s), EOCA pair hot-insertion and RF

Modules (Dual TRX Module and Dual Duplexer Module) connected behind remote

EOCA at times of BTS startup. The EOCAs are always detected in pairs (local and

remote) provided that at least one Dual TRX Module is connected behind the remote

EOCA.

Once the EOCA Module(s) are detected successfully, they are polled periodically to get

alarm statuses. If an EOCA Module fails to respond to the status poll request the BTS

starts a respective alarm.



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Flexi EDGE BTS Feature Descriptions



5.25



48 V DC input voltage supervision

Both the System Module (ESMA) and the System Extension Module (ESEA) supervise

the 48 V DC input voltage continuously. When the input voltage decreases below 44.0

V DC or increases above 58.0 V DC, BCF notification alarm 7602 Supply voltage to

ESMA near low/high limit and / or 7602 Supply voltage to ESEA near low/high limit is

activated to indicate that the input voltage is close to exceeding its normal operating

range.

For configurations where both the ESMA module and ESEA modules are present, if the

input voltage continues to decrease below 39.0 V DC or increase above 60.0 V DC, all

the Dual TRX Modules (EXxA) connected to the ESMA module and ESEA module are

shut down to protect their hardware. Alarm 7606 PDU Control has switched off

EXxx TRX Module is activated to indicate that the BTS has shutdown the Dual TRX

Module due to out of range input voltage.

When the input voltage increases up to and above 39.0V DC or falls down to and below

58.0 V DC, the Dual TRX Modules (EXxA) are powered up and the 7606 alarm is cancelled. Once the input voltage increases above 45.0 V DC or decreases below 57.0 V

DC the 7602 notification alarm is cancelled.

When EOCA modules are installed, the 48 V DC input voltage is monitored in the EOCA.

When the input voltage decreases to 40 V DC or increases to 58 V DC, alarm 7614

Site Powering Notification : Supply voltage to EOCA crossed

low/high limit is raised. The alarm will be raised for each affected EOCA module.

When the input voltage increases up to and above 40.0 V DC or falls down to and below

58 V DC, the 7614 alarm is cancelled.



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