<?xml version="1.0" encoding="utf-8" standalone="yes"?><html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Nokia UltraSite EDGE Base Station</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
<meta content="text/css" http-equiv="Content-Style-Type" />
<script src="NED?action=retrieve&amp;identifier=dn00188761&amp;edition=1&amp;language=none&amp;coverage=global&amp;encoding=javascript&amp;component=data&amp;item=data" type="text/javascript" xml:space="preserve">
</script>
<?conversion name="Pub2XHTML" version="2.0" source="urn:mars:dn0448329:1:en:global:publishing_online_1_0:data:data:*:*:*" date="2005-02-21T16:53:25Z"?>
<link href="NED?action=retrieve&amp;identifier=dn01158124&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=css&amp;component=data&amp;item=data" rel="stylesheet" title="Nokia Networks default online style" type="text/css" />
<meta content="draft" name="status" />
<?conversion name="SplitHTML" version="1.9" source="urn:mars:dn0448329:1:en:global:publishing_online_1_0:data:data:35:*:*" date="2005-02-21T16:53:25Z"?>
</head>
<body lang="en" xml:lang="en">
<p><a name="p2xhtm-repid-3" shape="rect"></a>
<a name="ned_3" shape="rect"></a></p>

<div class="div">
<table width="100%">
<tr>
<td align="center" colspan="1" rowspan="1" width="20%"><?NED5 annotation?>
<br clear="none" /><?NED5 printview?>
</td>
<td align="center" colspan="1" rowspan="1" width="20%"></td>
<td align="center" colspan="1" rowspan="1" width="20%"></td>
<td align="center" colspan="1" rowspan="1" width="20%"><a href="NED?action=retrieve&amp;identifier=dn0448329&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_1#ned_1" onclick="sync(this);return true" shape="rect">Temperature Control of BTS</a></td>
<td align="center" colspan="1" rowspan="1" width="20%"><a href="NED?action=retrieve&amp;identifier=dn0448329_about&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top" onclick="openSmallPopup(event,'NED?action=retrieve&amp;identifier=dn0448329_about&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=xhtml_1_0&amp;component=data&amp;item=data&amp;pointer=ned_top#ned_top');return false" shape="rect" target="_blank"><img alt="Document information" border="0" class="Metainfo" src="NED?action=retrieve&amp;identifier=dn01158003&amp;edition=1&amp;language=en&amp;coverage=global&amp;encoding=gif&amp;component=data&amp;item=data" /></a></td>
</tr>
</table>


<div class="div">
<h2>Nokia UltraSite EDGE Base Station</h2>

<p>The Nokia UltraSite EDGE Base Station monitors its temperature
continuously with several sensors located in several BTS units (BOI, Power
Supply Unit (PWSx), Dual Baseband Unit (BB2x), Transceiver Unit (TSxx), and
Remote Tune Combiner (RTxx)). The BTS controls its temperature with cooling
fans and heaters to provide as stable operational conditions as possible.
Heating and cooling is controlled gradually depending on the ambient temperature
to ensure low temperature gradients and noise level.</p>


<p>If the temperature of a unit rises too high, a temperature
alarm is issued. If the BOI is overheated, the BCF is blocked. If either the
BB2x or the TSxx are overheated, the associated TRXs are blocked. Power Supply
Units have their own internal shutdown and recovery in case they are overheated.</p>


<p>The temperature range of the Nokia UltraSite EDGE BTS is
-33 °C to 50 °C for the Outdoor cabinet with the optional heater, –10 °C to
50 °C for the Outdoor cabinet without the optional heater, and –5 °C to 50
°C for the Indoor cabinets.</p>


<a name="mar174107301" shape="rect"></a>
<div class="topic">
<h3>Cold
start from extremely cold temperature </h3>

<p>If the outdoor cabinet (with an optional cabinet heater)
starts up in temperature less than –10 °C, the control logic in the heater
does not enable PWSs to switch power on to the BTS. Instead the control logic
activates the cabinet heater until the temperature of the units reaches –5
°C. After that Power Supply units are allowed to switch on and the BOI takes
over the control of heating.</p>
</div>
</div>
</div>
</body>
</html>