Mitel Aastra 470, Системное руководство, Страница: 45 / 284

Expansion Stages and System Capacity
45
Aastra 470 as of R3.2
syd-0337/1.6 – R3.2 – 09.2014
3. 2. 4 DSP Resources
DSP resources are used for complex signal processing functions. (DSP stands for Digi-
tal Signal Processor). They provide functions for conference circuits, DTMF sender and
receiver, compression of voice data, etc. Two DSP chips are permanently 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. 16 ).
The functions of the second DSP chip can be selected to suit requirements. The func-
tions are partly subject to licence (see
Tab. 21 ).
The basic resources of the communications server can be expanded by fitting DSP
modules (see
"DSP modules", page 46 ) and IP media modules (see "IP media module",
page 54 ). The functions of the DSP chips on the DSP modules can also be configured.
System modules on the call manager card
The table below provides an overview of fixed DSP functions on the call manager card.
Except for the Enterprise voice mail channels no licences or additional hardware are
required to be able to use the functions.
Tab. 16 System modules on the call manager card
Max. number of simultaneous ...
Number of
entries
Total circuits for the functions
1)
three-party conference, six-party conference, intrusion and
silent intrusion.
2)
1)
The functions can all be of the same type or used as a mix.
2)
Licence required
10
Circuits for the Call Waiting function 6
DTMF sender 9
DTMF receiver for voice mail or auto attendant 8
DTMF receiver for analogue terminals 8
Dialling tone receiver 2
Busy tone receiver 5
Ring receiver 2
FSK receiver
3)
for CLIP detection on analogue network interfaces
3)
One FSK transmitter available per FXS interface for CLIP display on analogue terminals. No DSP resources re-
quired.
4
CAStransmitter/receiver for PRI network interfaces
4)
4)
Of relevance only to certain countries such as Brazil
30
Total audio channels for basic voice mail
5)
or auto attendant
2)
5)
Can be used without licence subject to the following restrictions: Voice memory capacity approx. 20 min-
utes, no e-mail notification in the event of new voice messages, no forwarding of voice messages, no call re-
cording, restricted voice mail menu by remote retrieval.
2
Total audio channels for Enterprise voice mail
2)
, auto attendant
2)
or call recording
2)
8