Expansion Stages and System Capacity
3.2.3 Media resources
Media resources are used for complex signal processing functions, and made available by DSP chips.
(DSP stands for Digital Signal Processor). They provide functions for conference circuits, DTMF sender
and receiver, compression of voice data, etc. A DSP chip is fitted permanently to the mainboard.
Part of these media resources is allocated to fixed functions and can be used without licences (see
Fixed functions of the mainboard DSP). Another part is allocated to selectable functions, according to
requirements. These functions are partly subject to licence (see Selectable functions of the mainboard
DSP).
The basic resources of the communication server can be expanded by fitting DSP modules . The functions
of the DSP chips on the modules can also be configured (see Max. number of channels per DSP chip on
SM-DSPX1 or SM-DSPX2 and Mitel 6900 SIP series SIP phones).
Fixed functions of the mainboard DSP
The table below provides an overview of the fixed functions of the mainboard DSP. No licences or
additional hardware is required to use the functions.
Table 13: Fixed functions of the mainboard DSP
Max. number of simultaneous ... SMBC
Total circuits for three-party to six-party conference 10
Call waiting circuits 3
Intrusion and silent intrusion circuits 4
DTMF receiver for voice mail, auto attendant or analogue terminals 10
Dialling tone receiver 4
Busy tone receiver 4
Ring signal receiver 2
FSK receiver for CLIP detection on analogue network interfaces 2
FSK transmitter for CLIP display on analogue terminals 2
Release 7.1
43 System Manual for Mitel SMB Controller
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