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<div class="div">
<h1>Combined O&amp;M and Telecom Signalling</h1>

<p>This feature means that O&amp;M (OMUSIG) and telecom signalling
(TRXSIG) links can be placed on the same timeslot on Abis PCM. The combining
of the O&amp;M and Telecom signalling enables more efficient use of transmission
capacity.</p>


<p>The transceiver of the Nokia MetroSite BTS can be configured
as a master or slave of a TRX. The master transceiver takes care of both telecom
and O&amp;M functions. So combining of O&amp;M and Telecom signalling is easier
to carry out.</p>


<a name="mar1841116111" shape="rect"></a>
<dl class="note-notification">
<dt class="note-caption">Note</dt>
<dd>In the first SW release, the TRX 1 is the master TRX. </dd>
</dl>


<p>Combination of links does not affect the current procedures
inside the BSC since they are seen as two separate logical links. Both combined
links have their own D-Channel number in the BSC. The states of the links
are handled independently. Links have own SAPI and TEI values and polling.</p>


<a name="mar1841118162" shape="rect"></a>
<div>
<table border="1">
<thead>
<tr align="left" char="" charoff="50" valign="bottom">
<th colspan="1" rowspan="1" valign="top"><p>LAPD connection type</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>SAPI</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>TEI</p>
</th>
<th colspan="1" rowspan="1" valign="top"><p>Supported bit rates</p>
</th>
</tr>
</thead>
<tbody>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>TRXSIG</p>
</td>
<td colspan="1" rowspan="1"><p>0</p>
</td>
<td colspan="1" rowspan="1"><p>TRX-id</p>
</td>
<td colspan="1" rowspan="1"><p>16, 32, 64</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Autoconfiguration access channel </p>
</td>
<td colspan="1" rowspan="1"><p>61</p>
</td>
<td colspan="1" rowspan="1"><p>0</p>
</td>
<td colspan="1" rowspan="1"><p>64</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>OMUSIG</p>
</td>
<td colspan="1" rowspan="1"><p>62</p>
</td>
<td colspan="1" rowspan="1"><p>1</p>
</td>
<td colspan="1" rowspan="1"><p>16, 32, 64</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Combined OMUSIG and TRXSIG *)</p>
</td>
<td colspan="1" rowspan="1"><p>0 and 62 are used:</p>


<p>0 for TRXSIG, 62 for OMUSIG</p>
</td>
<td colspan="1" rowspan="1"><p>TRX-id and 1 are used</p>
</td>
<td colspan="1" rowspan="1"><p>16, 32, 64</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>L2 control </p>
</td>
<td colspan="1" rowspan="1"><p>63</p>
</td>
<td colspan="1" rowspan="1"><p></p>


 </td>
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 </td>
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<p>*1) Two LAPD connection types use the same position on
Abis PCM</p>
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