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<h1>Nokia Transcoder Submultiplexer</h1>

<p>Nokia Transcoder Submultiplexer DX 200 TCSM2 is used on
the A interface between the BSC and the MSC to enable the full use of network
capacity. Nokia Transcoder Submultiplexer performs transcoder functions in
the base station subsystem and provides a submultiplexing scheme that is used
between the transcoder and the BSC.</p>


<p>The Nokia Transcoder Submultiplexer units are functional
units of the BSC, but can be located either at the BSC or MSC site. Submultiplexing
is used between the BSC and TCSM to reduce transmission costs. The reduction
is greatest when Nokia Transcoder Submultiplexer is located at the MSC site.
Submultiplexing also reduces the amount of pulse code modulation (PCM) circuits
needed between the MSC and BSC sites.</p>


<p>Nokia Transcoder Submultiplexer converts the 64 kbit/s
traffic channels arriving from the MSC into 16 kbit/s or 8 kbit/s channels
and multiplexes these channels to fit the PCM line time slots going towards
the BSC. The same principle in reverse applies to the other direction (from
the BSC to the MSC).</p>


<p>Nokia Transcoder Submultiplexer performs speech coding
according to the speech compression methods mentioned in the GSM specifications.
It also supports Full Rate (FR), Half Rate (HR) and Enhanced Full Rate (EFR)
codecs. In addition, Nokia features Acoustic Echo Canceller (AEC), Noise Suppression
(NS) and Adaptive Gain Control can be used in Nokia Transcoder Submultiplexer
to further improve network speech quality for mobile subscribers.</p>


<p>The modular architecture of DX 200 Switching System Product
Family enables the easy expanding of Nokia Transcoder Submultiplexer, whose
capacity depends on the number of equipped plug-in units.</p>


<p>Nokia Transcoder Submultiplexer supports the downloading
of the entire software from the BSC or a PC via the Visual Display Unit (VDU)
interface. The operation and maintenance functions of Nokia Transcoder Submultiplexer
are also co-ordinated with the BSC.</p>


<p>A standard rack can house eight Nokia Transcoder Submultiplexer
units, which may belong to different BSSs. Nokia Transcoder Submultiplexer
units that handle the A interface of one BSC usually fit into one rack.</p>


<p>For more information on Nokia Transcoder Submultiplexer,
see <em>TCSM2 Functional Description</em>.</p>


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<p>Table: Technical information of TCSM2</p>


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<td colspan="1" rowspan="1"><p>TCH number (max.)</p>
</td>
<td colspan="1" rowspan="1"><p>960 (FR)</p>


<p>1680 (HR)</p>
</td>
</tr>
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<td colspan="1" rowspan="1"><p>Size (height x width x depth)</p>
</td>
<td colspan="1" rowspan="1"><p>2030 mm x 880 mm x 500 mm</p>
</td>
</tr>
<tr align="left" char="" charoff="50" valign="top">
<td colspan="1" rowspan="1"><p>Power consumption</p>
</td>
<td colspan="1" rowspan="1"><p>360W (FR)</p>


<p>940W (HR)</p>
</td>
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