Expansion Stages and System Capacity
49
Aastra 470 ab R3.0
syd-0337/1.5 – R3.0 – 05.2013
3. 2. 4 DSP Resources
DSP resources are used for complex signal processing functions. (DSP stands for
Digital Signal Processor). They provide functions for conference circuits, DTMF
sender and receiver, compression of voice data, etc. Two DSP chips are perma-
nently fitted to the call manager card.
A DSP chip on the call manager card is allocated to fixed functions, which can be
used without licences (see Tab. 14).
The functions of the second DSP chip can be selected to suit requirements. The
functions are partly subject to licence (see Tab. 19).
The basic resources of the communications server can be expanded by fitting DSP
modules (see "DSP module", page 51) and IP media modules (see "IP media mod-
ules", page 58). The functions of the DSP chips on the DSP modules can also be con-
figured.
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