47
E
XPANSION WITH CARDS AND MODULES
CHAPTER 3 EXPANSION STAGES AND SYSTEM CAPACITY
DSP modules
Processor-intensive system functions require media resources. The communication server’s DSP
capacity increases through the use of DSP modules.
Figure 3.3: Design of the DSP module
DSP modules are stacked on the DSP slot on the mainboard (see Mainboard interfaces, display and
control elements and front panel) and do not take up any slots for interface cards (see Fitting DSP
modules). The different types of modules can be used as a mix.
NOTE: Do not use the older DSP modules of type SM-DSP1 and SM-DSP2 as these modules are not
supported with Mitel SMB Controller.
Allocatable functions
One or more functions can be allocated to the individual DSP chips on the DSP modules. For this the DSP
chips have to be loaded with different firmware. The additional media resources can be used for DECT
telephony, Voice over IP, fax transmissions, audio services or integrated mobile/external phones. This
means that for each DSP chip a specific number of channels is available for the corresponding functions.
Some of these functions are subject to a licence (see also Licences
).
Functions are allocated in WebAdminin the Media resources ( =ym) view.
• DECT
Operation of a DECT system on DSI interfaces with cordless phones. The voice data must be trans-
formed on connections between DECT and non-DECT end-points. This process requires DSP capac-
ity.
Purely DECT-DECT connections set up already do not require any media resources. On the other
hand, media resources are required to set up connections.
DECT channels can be used without a licence.
• VoIP
Connections between IP and non-IP endpoints are made via an IP media gateway. This is carry out
by the integrated standard media switch that switches VoIP channels for call connections in the IP
network. The Standard Media Switch uses media resources for the real-time processing of the call
Table 3.6:DSP modules
Type Number of DSP chips per
module
Max. number of modules per
system
SM-DSPX1 1 3
SM-DSPX2 2
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