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<div class="div">
<h1>External Interfaces of Nokia MetroSite BTS</h1>

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<div class="topic">
<h2>Air</h2>

<p>Each TRX has an antenna connector for external antennas. </p>


<p>The nominal RX sensitivity is better than -106dBm. The
nominal maximum TX output power at antenna connector is 1W.</p>


<p>Diversity is provided when more than one transceiver is
installed per sector.</p>
</div>


<a name="feb25416924" shape="rect"></a>
<div class="topic">
<h2>Abis</h2>

<p>The transmission unit takes care of the transmission between
Nokia MetroSite BTS and the BSC through the Abis interface. The transmission
media can be either radio link or wire line (E1/T1). The transmission unit
interconnects the Nokia MetroSite BTS and the BSC using point-to-point, star
or loop network configurations.</p>


<p> Nokia MetroSite BTS supports 16 kbit/s, 32 kbit/s, and
64 kbit/s Abis TRX signaling. Similarly, the O&amp;M signaling speed can be
16 kbit/s, 32 kbit/s, or 64 kbit/s. Nokia MetroSite BTS also supports combined
O&amp;M and Telecom signaling.</p>


<p> Locally, the transmission configuration is managed with
the Nokia MetroSite Manager.</p>


<p>The following radio link transmission units are available
for Nokia MetroSite BTS:</p>


<ul>
<li><p><span class="menupath-sem">FC
RRI</span>: 16 x 2 Mbit/s, support for 1 microwave radio outdoor unit, cross
connection on 2 Mbit/s level.</p>
</li>
<li><p><span class="menupath-sem">FXC
RRI</span>: 16 x 2 Mbit/s, support for 2 microwave radio outdoor units, grooming,
branching and loop protection support, cross connection on 8 kbit/s level.</p>
</li>
</ul>


<p>FC RRI and FXC RRI transmission units are compatible with
the Nokia MetroHopper Radio and the Nokia FlexiHopper Microwave Radio.</p>


<p>The following wire line transmission units are available
for the Nokia MetroSite BTS:</p>


<ul>
<li><p><span class="menupath-sem">FC
E1/T1</span>: 1 x 2 Mbit/s (E1) or 1 x 1.5 Mbit/s (T1) PCM connection, (one
coaxial 75 ohm TX and RX interface connector for E1 use, one twisted pair
100/120 ohm TX/RX interface connector for either E1 or T1 use).</p>
</li>
<li><p><span class="menupath-sem">FXC
E1/T1</span>: 4 x 2 Mbit/s (E1) or 4 x 1.5 Mbit/s (T1) PCM connections, (either
four coaxial 75 ohm TX and RX interface connectors for E1 use, or four twisted
pair 120/100 ohm TX/RX interface connectors for either E1 or T1 use), grooming,
branching, and loop protection support, cross-connection down to 8 kbit/s
level.</p>
</li>
</ul>


<p>The FC E1/T1 operates as the termination point in a star
or chain topology network. The FXC E1/T1 transmission unit interconnects the
Nokia MetroSite BTS and the BSC using point-to-point, chain, star, or loop
network configurations.</p>


<p>If more transmission capacity is needed, the Nokia MetroHub
Transmission Node can be used with the Nokia MetroSite BTS.</p>
</div>


<a name="feb2541627565" shape="rect"></a>
<div class="topic">
<h2>Local
Management Port for BTS and transmission units</h2>

<p>The LMP connector provides physical RS-232 connection.</p>
</div>


<a name="feb2541628276" shape="rect"></a>
<div class="topic">
<h2>Q1
for transmission units</h2>

<p>Common Q1 connector is located at the interface and clock
unit.</p>


<p>It provides control interface for co-sited transmission
equipment.</p>
</div>


<a name="feb254162967" shape="rect"></a>
<div class="topic">
<h2>External
Alarm and Control (EAC)</h2>

<p>The number of EAC inputs is 10, and the number of outputs
is 4.</p>
</div>


<a name="feb2541629428" shape="rect"></a>
<div class="topic">
<h2>External
D-bus</h2>

<p>External D-bus interface is provided for BTS extensions. </p>
</div>


<a name="feb2541630199" shape="rect"></a>
<div class="topic">
<h2>Power
Supply</h2>

<p>Power supply alternatives are: 230 VAC and 110 VAC.</p>


<p>DC power supply for 36 VDC/48 VDC/60 VDC voltages.</p>


<p>Power supply is capable of feeding power to the maximum
BTS configuration including two Nokia MetroHopper Radio outdoor units or two
Nokia FlexiHopper MicroWave Radio outdoor units.</p>
</div>


<a name="feb25416411010" shape="rect"></a>
<div class="topic">
<h2>Grounding
point</h2>

<p>The grounding cable can be connected to chassis.</p>
</div>


<a name="feb25416415411" shape="rect"></a>
<div class="topic">
<h2>User
interface and visual operation indicators</h2>

<p>The single 3-colour LED is used as an operation indicator
for the following units:</p>


<ul>
<li><p>Transceiver</p>
</li>
<li><p>Power supply unit</p>
</li>
<li><p>Cooling fan unit</p>
</li>
<li><p>Interface unit</p>
</li>
<li><p>Transmission unit.</p>
</li>
</ul>
</div>
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