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<div class="div">
<h1>BTS Testing in BSC</h1>

<a name="mar12416145512" shape="rect"></a>
<div class="topic">
<h2>General</h2>

<p>BTS testing in the BSC provides the user the means of checking
the operational condition of the base station system. BTS testing principles
are divided into three parts:</p>


<ul>
<li><p>Commissioning</p>


<p>	When new equipment is installed to the network, its functionality
can be verified by testing. Tests can be done as single tests on the BTS site
by the BTS-MMI or remotely from the BSC site by MML's.</p>
</li>
<li><p>Monitoring</p>


<p>	Monitoring means preventative maintenance, which can be
carried out with scheduled BTS tests. With these tests, faults can be found
before they cause traffic problems. The threshold for the test result (pass/fail)
is adjustable.</p>
</li>
<li><p>Fault diagnosis</p>


<p>	With fault diagnosis, faults can be located to a specific
part of the base station system or BTS.</p>
</li>
</ul>


<p>The BSC keeps a test report history of the tests, which
are executed, via the BSC's MMI user interface. The results can be printed
out on the MMI screen with MMI commands. One result per test object is saved.
Depending on the test type, the test object can be either a BTS or a TRX.
Only the latest test result of an object can be seen.</p>


<p>Radio Frequency Test Equipment (RFTE) or a Site Test Monitor
Unit (STM) can perform the tests. The RFTE is capable of performing a looping
function on the RF-signal. It loops the transmitted signal back to the receiver
of the BTS thus making it possible to monitor the condition of the common
RF-units.</p>


<p>The STM has a standard Nokia mobile phone integrated in
an STM unit. The STM unit is an option in the BTS, and when used, it replaces
the RFTE. For Nokia Talk-family and Nokia PrimeSite BTS's there are also tests,
which do not require any specific test equipment.</p>


<p>The STMA is an older version of the STM unit. The STMA
is not available anymore. It has been replaced with a new version of the STM,
the STMB/C/D/E. The STMB is for Nokia 2nd generation (the GSM 900), the STMC
is for Nokia 2nd generation (GSM 1800), and the STMD is for Nokia Talk-family
(the GSM 900) and the STME for Nokia Talk-family (the GSM 1800). The STMP
is a portable STM. The STMP is used in commissioning and testing Nokia FlexiTalk
DE 34/ DF 34 BTSs. As there is not enough space for the STMD/E unit in the
Nokia FlexiTalk, the STMP must be used to connect the STMD/E unit to the BTS.</p>


<p>The following table clarifies what equipment is needed
in different types of sites in order to carry out certain BTS tests.</p>
</div>


<a name="mar12416193713" shape="rect"></a>
<div>
<table border="1">
<thead>
<tr align="left" char="" charoff="50" valign="bottom">
<th colspan="1" rowspan="1" valign="top"><p></p>


 </th>
<th colspan="1" rowspan="1" valign="top"><p>2nd Gen GSM 900</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>2nd Gen GSM 1800</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Talk-family (GSM 900)</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Talk-family (GSM 1800)</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Prime Site    </p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>TRX Test by Cable</p>
</td>
<td colspan="1" rowspan="1"><p>RFTE or STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>RFTE or STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>TRX Test by Air</p>
</td>
<td colspan="1" rowspan="1"><p>STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>RX Antenna Test</p>
</td>
<td colspan="1" rowspan="1"><p>RFTE or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>TRX Loop Test</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>No test equipment</p>
</td>
<td colspan="1" rowspan="1"><p>No test equipment</p>
</td>
<td colspan="1" rowspan="1"><p>No test equipment</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Antenna Loop Test</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>No test equipment</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>MOC</p>
</td>
<td colspan="1" rowspan="1"><p>STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>MTC</p>
</td>
<td colspan="1" rowspan="1"><p>STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p> BCCCH Field Strength Meas. </p>
</td>
<td colspan="1" rowspan="1"><p>STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Receiver Sensitivity Measurement</p>
</td>
<td colspan="1" rowspan="1"><p>STMA or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>STMC</p>
</td>
<td colspan="1" rowspan="1"><p>STMD</p>
</td>
<td colspan="1" rowspan="1"><p>STME</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>RX Antenna Supervision</p>
</td>
<td colspan="1" rowspan="1"><p>RFTE or STMB</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
<td colspan="1" rowspan="1"><p>-</p>
</td>
</tr>
</tbody>
</table>
</div>


<p>A test can be interrupted in a selected BTS. Tests, which
are executed by the RFTE, cannot be interrupted. All tests can be run also
locally at the site with BTS-MMI.</p>


<a name="mar1241632215" shape="rect"></a>
<div class="topic">
<h2>TRX
Test</h2>

<p>A TRX Test include:</p>


<ul>
<li><p>TRX test by cable (RFTE, STM)</p>
</li>
<li><p>TRX test by air (STM).</p>
</li>
</ul>


<p>The RFTE or STM loops the RF signal of one radio time slot
through both the transmitters (via the possible combiner) and the receiver
without causing any disturbances to other channels. The TRX test shows how
the transmitters and receivers work.</p>


<a name="apr1641043451" shape="rect"></a>
<div>
<img alt="urn:mars:dn0469877:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0469877&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: TRX test</p>
</div>


<p>A test connection ‘by air’ requires an STM. A TRX test
by air also checks the BTS RX and TX antennas and indicates the antenna isolation
between BTS antennas and the STM antenna.</p>


<p>Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>TRX number</p>
</li>
<li><p>Time slot</p>
</li>
<li><p>RFTE attenuation</p>
</li>
<li><p>Loop duration</p>
</li>
<li><p>Diversity</p>
</li>
<li><p>Test connection (by air or by cable)</p>
</li>
<li><p>BTS TX power attenuation</p>
</li>
<li><p>Loop level</p>
</li>
<li><p>STM antenna attenuation.</p>
</li>
</ul>


<a name="apr194163151" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473428:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473428&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="mar12416383716" shape="rect"></a>
<div class="topic">
<h2>RX
Antenna Test</h2>

<p>The RX antenna test shows what is the condition of the
receiver antennas. The test is similar to the single TRX test by cable, except
that it is based on two loops. In the first loop, the signal is forwarded
to the BTS’s receiver. The first loop is a reference test for the second loop.
In the second loop, a directive coupler is controlled to feed RF signal towards
the RX antenna. Now the signal that BTS receives is the signal reflected from
the cable and antenna. By comparing the test results of these two tests, it
can be found out what is the matching of the RX antenna. In a perfect matching,
no signal should be reflected from the antenna. The test can be defined in
the same way as a TRX test.</p>


<p>This test is available in Nokia 2nd generation BTSs only
for the GSM 900.</p>


<p>Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>TRX number</p>
</li>
<li><p>Time slot</p>
</li>
<li><p>RFTE attenuation</p>
</li>
<li><p>Diversity</p>
</li>
<li><p>BTS TX power attenuation.</p>
</li>
</ul>


<a name="apr194164492" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473431:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473431&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="mar1241641417" shape="rect"></a>
<div class="topic">
<h2>TRX
Loop Test</h2>

<p>In a TRX loop the test data generated by SW in digital
parts of the TRX is looped from the TX to RX side inside the TRX so that the
complete TX- and RX-chains are tested. TRX SW checks the looped, and the test
result is given as BER values. The looping is done with a mixer, thus the
delay of three timeslots between transmission, and reception is not implemented.
Therefore, two timeslots need to be reserved for this test, one for transmission
and another for reception. Timeslots are selected by the system in such a
way that transmission and reception overlap in time. The TRX loop can be executed
only in TCH/FR timeslots.</p>


<p>If base band hopping is used, this sets some limitations
to the use of the loop. Both the timeslots reserved for the loop must use
exactly the same hopping sequence, otherwise the data transmitted is never
looped back to the originator.</p>


<p>Only the Nokia Talk-family and PrimeSite BTSs can be perform
the test. The test does not require any special test equipment in the BTS.</p>


<p>Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>TRX number</p>
</li>
<li><p>Time slot</p>
</li>
<li><p>Loop duration</p>
</li>
<li><p>Diversity</p>
</li>
<li><p>BTS TX power attenuation.</p>
</li>
</ul>


<a name="apr19416603" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473443:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473443&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="mar12416433518" shape="rect"></a>
<div class="topic">
<h2>Antenna
Loop Test</h2>

<p>The functions of the antenna loop test and TRX loop test
are very much alike. The test data generated by SW in digital parts of the
BTS is looped from TX to RX via air interface, thus the complete TX- and RX-chains
are tested. TRX SW checks the looped data, and the test result is given as
BER values. The VSWR of the transmitting antenna is also measured. The antenna
loop can executed only in TCH/FR timeslots.</p>


<p>Only Nokia PrimeSite BTSs can perform the antenna loop
test. The test does not require any special test equipment in the BTS.</p>


<p>Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>TRX number</p>
</li>
<li><p>Time slot</p>
</li>
<li><p>Diversity</p>
</li>
<li><p>BTS TX power attenuation.</p>
</li>
</ul>


<a name="apr194167134" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473455:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473455&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="mar12416453619" shape="rect"></a>
<div class="topic">
<h2>Scheduled
TRX Test </h2>

<p>By the scheduled TRX test it is possible to run the <span class="menupath-sem">TRX test, the TRX loop test, the RX antenna test,
and the Antenna loop test</span> in the selected BTSs. The selected BTS must
support the test type.</p>


<p>The user creates the scheduled TRX test in the NetAct.
 The schedule (a calendar) is defined with parameters:</p>


<ul>
<li><p>Start date</p>
</li>
<li><p>Stop date</p>
</li>
<li><p>Period start time</p>
</li>
<li><p>Period stop time</p>
</li>
<li><p>Testing days (days of the week).</p>
</li>
</ul>


<p>A NetAct user can create 15 scheduled TRX tests to the
same BSC so, for example, different BTS generations can be tested with different
test parameters and schedules.</p>


<p>The possible values for the parameter that defines the
receiver branch used in scheduled BTS tests - TRX test by cable or air, RX
antenna test, TRX loop test, Antenna loop test (the possible tests are dependent
on the BTS generation and/or the test equipment) - are:</p>


<ul>
<li><p>Branch 1  	(RX path 1)</p>
</li>
<li><p>Branch 2  	(RX path 2)</p>
</li>
<li><p>Averaged 	(Combined).</p>
</li>
</ul>


<p>This feature introduces a new parameter value:</p>


<p>Both 	 (RX paths 1 and 2 separately)</p>


<p>When the selection BOTH is used, the scheduled test for
RX path 1 and 2 is executed one after the other. A separate result of RX path
1 and 2 is sent to the NetAct.</p>
</div>


<a name="apr164104732" shape="rect"></a>
<div class="topic">
<h2>Originating
Test Call</h2>

<p>In an originating test call, the user sends the target
phone number to the STM. The STM makes a call to the specified number. When
the operator answers the phone, the operator can hear that the speech path
is open as the STM loops the speech back. Call status information is reported
from the BTS to the user. Call information can be inquired several times during
the call. In the test request, the user can define the BCCH's (broadcast control
channel) ARFN (absolute radio frequency number) that will be used in the test
call.</p>


<p>Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>BCCH ARFN</p>
</li>
<li><p>Subscriber number</p>
</li>
<li><p>STM antenna attenuation.</p>
</li>
</ul>


<a name="apr194168395" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473467:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473467&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="apr1641048153" shape="rect"></a>
<div class="topic">
<h2>Scheduled
Originating Test Call</h2>

<p>Originating test calls can also be executed as a scheduled
test. The test makes originating test calls through selected BTSs. If the
test call fails, an alarm will be set for the concerned BTS. Data on successful
and unsuccessful calls is collected to traffic measurement counters, which
are updated during the test. A scheduled test can be managed by the MMI commands.</p>


<p>In a scheduled originating test call, the user can define
the BTSs, which are tested periodically by the test call. BTSs can be defined
as main BTSs (the ones which have an STM) and subBTSs (the main BTS's adjacent
BTSs). One main BTS can have 10 subBTSs to be tested. It is possible to define
10 scheduled MOC tests per BSC. The tests are managed by the MMI commands.</p>


<p>The time schedule is defined with parameters:</p>


<ul>
<li><p>Start date</p>
</li>
<li><p>Start time</p>
</li>
<li><p>Test interval.</p>
</li>
</ul>
</div>


<a name="apr1641049194" shape="rect"></a>
<div class="topic">
<h2>Terminating
Test Call</h2>

<p>The terminating test call test shows if the BTS works in
general. To perform this test, make a call to the STM, which loops the speech
back to the operator's phone. Before the test, the STM can be synchronised
to the given a BCCH ARFN. When the call is on, the operator can ask information
about the call in the same way as in the originating test call. Information
can be asked for several times during the test. Test information will be reported
from the BTS to the user.</p>


<p>BCCH synchronisation parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>BCCH ARFN</p>
</li>
<li><p>STM antenna attenuation.</p>
</li>
</ul>


<a name="apr194169526" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473479:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473479&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>


<p>The receiver sensitivity measurement can also be executed
as a scheduled test. If the test fails, the BSC sets also an alarm in addition
to the test report.</p>


<p>The scheduled test can be created, started, stopped, modified,
and deleted, and the results can be interrogated with the BSC’s MML.</p>
</div>


<a name="apr1941613297" shape="rect"></a>
<div class="topic">
<h2>BCCH
Field Strength Measurement</h2>

<p>The BCCH field strength can be measured from the selected
BTS. The measured BCCH's ARFN can be given in the test command. The STM measures
the selected BCCH ARFN signal strength.</p>


<p> Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>BCCH ARFN</p>
</li>
<li><p>STM antenna attenuation.</p>
</li>
</ul>


<a name="apr194161579" shape="rect"></a>
<div>
<img alt="urn:mars:dn0473482:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473482&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>
</div>


<a name="apr19416162910" shape="rect"></a>
<div class="topic">
<h2>Receiver
Sensitivity Measurement</h2>

<p>Receiver sensitivity is measured by the BTS. The BTS sends
data to the STM through the cable connection. The STM loops the data back,
and the BTS calculates the RBER2 (2nd class bit error ratio) value. The STM
changes the power level of the transmitter of a mobile until the specified
RBER2 level is achieved. Test results are reported to the user.</p>


<p> Test parameters are:</p>


<ul>
<li><p>BTS number or name</p>
</li>
<li><p>TRX number</p>
</li>
<li><p>Time slot.</p>
</li>
</ul>


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<div>
<img alt="urn:mars:dn0473494:1:en:global:tiff:data:data" border="0" src="NED?action=retrieve&amp;identifier=dn0473494&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /><p class="figure-caption">Figure: Example of test report</p>
</div>


<p>The receiver sensitivity measurement can also be executed
as a scheduled test. If the test fails, the BSC sets also an alarm in addition
to the test report.</p>


<p>The scheduled test can be created, started, stopped, modified,
and deleted, and the results can be interrogated with the BSC’s MML.</p>
</div>


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<div class="topic">
<h2>RX
Antenna Supervision</h2>

<p>The Nokia 2nd generation BTS can perform an RX antenna
test periodically (RFTE or STM is required). The User can define the period
in minutes with a BSC MML. If a fault is detected, the BTS sends an alarm
to the BSC.</p>
</div>


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<div class="topic">
<h2>TRX
Test for the Nokia MetroSite Base Station</h2>

<p>This test is meant for testing the total performance of
the intended TRX and Radio Time Slot (RTS). The test covers all the functions
between the Abis and Air: Digital and RF parts, VSWR for antennas, RX sensitivity,
and TX level.</p>


<p>The main reason for providing a single multipurpose test
is to minimise the total test time, that is, once the timeslot is reserved
for testing, the test time is used effectively. This test uses the multifunctional
RF loop. The test is automatically performed for both RX branches. The test
time is a couple of seconds. This test can be used as an RF-performance supervision
test when performed according to regular schedules from the NetAct.</p>
</div>


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<div class="topic">
<h2>TRX
Test for Nokia UltraSite EDGE BTS</h2>

<p>This test is meant for testing the total performance of
the intended TRX and Radio Time Slot (RTS). The test covers most of the functions
between the Abis and Air interfaces: Digital and RF parts, RX sensitivity,
and TX level.</p>


<p>The main reason for providing a single multipurpose test
is to minimise the total test time.</p>


<p>When the TRX test is carried out according to a regular
schedule, it can be used in TRX performance supervision.</p>


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


<p>The power level during the TRX test is the same as the
BCCH power level. To avoid unwanted disturbances to the TRXs, the training
sequence is not the same as the one normally used.</p>


<p>All TRXs in a BTS can be tested either remotely from the
BSC or NMS/2000 or locally with the Nokia BTS Manager.</p>


<a name="apr164105613" shape="rect"></a>
<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>The TRX test can be performed only in TCH timeslots. Two
free timeslots are needed for the test. A TRX test is not possible when baseband
hopping is used.</dd>
</dl>
</div>


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<div class="topic">
<h2>Abis
Loop Test</h2>

<p>The Abis loop test is performed in order to check the Abis
transmission has been properly set up (after an Auto configuration for the
Nokia InSite BTS), the quality of the Abis transmission, and to trace possible
transmission problems in the Abis interface.</p>


<p>Automatic testing consists of TRX testing and the testing
of Abis transmission. The Abis Loop Test is in charge of testing the Abis
transmission. The main tasks of the Abis loop test are to ensure that Abis
connections have been made properly and that the quality of the connections
is sufficient.</p>


<p>The Abis loop test starts when the Nokia MetroSite Base
Station receives the testing request manually by the MML or by the commissioning
wizard. A testing restriction is that control channels can only be tested
during commissioning. For the Nokia UltraSite BTS, the Abis loop test starts
when it receives the testing request manually by the MML. For the Nokia InSite
BTS, the Abis Loop Test starts when it receives the testing request manually
by the MML or during the Abis Auto configuration procedure. A testing restriction
is that control channels can only be tested during auto configuration.</p>
</div>
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