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<h2>Base station transmission</h2>

<p>The Nokia BTSs contain a fully integrated cross-connection
functionality that brings savings in the GSM/EDGE transmission costs. The
BTS can operate as a transmission relay, cross-connect, and add-drop multiplexer
(ADM) offering a wide range of different branching, grooming, and add-drop
functions. The add-drop functions range from 2Mbit/s level down to 8kbit/s
level. The multidrop function can be used in BTS chains or in loops where
several BTSs are connected on a single 2 Mbit/s line.</p>


<p>The BTS transmission equipment can be managed from Nokia
NetAct integrated network management system, which simplifies network maintenance
and operation.</p>


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<h3>FXC units with cross-connection</h3>

<p>The FXC units include a very powerful cross-connection system with a
granularity of 8 kbit/s.</p>


<ul>
<li><p>FXC E1/T1 (4 x 2M/1.5M), symmetric wire line transmission, 120/100
Ohm</p>
</li>
<li><p>FXC E1 (4 x 2M), asymmetric wire line transmission, 75 Ohm</p>
</li>
<li><p>FXC RRI (16 x 2M), radio link transmission (Flexbus connection
for 2 outdoor units)</p>
</li>
<li><p>FXC STM-1: Unit with 2 STM-1 interfaces for fibre optic cable
(L-1.1 laser interface), SDH standard compliant, add/drop and cross-connection
at VC-12 layer, synchronisation functions.</p>
</li>
<li><p>FXC Bridge: Bridge for the signals between the SDH part of the
BTS and the PDH cross-connect of the FXC equipment. Includes Q1 management
and cross-connection on 8 kbit/s, 16 kbit/s, 32 kbit/s and 64 kbit/s granularity.</p>
</li>
</ul>


<p>This unit is always used with the FXC STM-1 card.</p>
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<h3>FC units</h3>

<p>The FC units were designed to be used with Nokia MetroSite BTS. With
Nokia UltraSite BTS, the use of a FXC unit is recommended because of EDGE
evolution. </p>


<p>Two FC units are available:</p>


<ul>
<li><p>FC E1/T1 (1 x 2M/1.5M), wire line transmission (can be used with
the Nokia MetroSite BTS and Nokia UltraSite BTS) </p>
</li>
<li><p>FC STM-1: a unit with 2 STM-1 interfaces for fibre optic cable
(L-1.1 laser interface), SDH standard compliant, add/drop and cross-connection
at VC- 12 layer, synchronisation functions (only to be used with Nokia MetroSite
BTS. CXM 4.1 SW or later is required.).</p>
</li>
</ul>
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