Expansion Stages and System Capacity
44
Aastra 415/430 as of R3.2
syd-0344/1.6 – R3.2 – 09.2014
Note
The SM1 and SM2 slots are not identical (the space between the two con-
nector rails is different). Fitting DSP modules on the SM2 slot is thus not
mechanically possible.
Tab. 17
DSP modules
Compared with DSP modules, modules with the designation DSPX are fitted with
more powerful DSP chips. They are used to transmit VoIP data among others using
the SRTP protocol (Secure VoIP).
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 ad-
ditional DSP resources can be used for DECT telephony, Voice over IP, fax transmis-
sions, audio services, integrated mobile phones or for remote maintenance via mo-
dem. This means that for each DSP chip a specific number of voice channels is avail-
able for the corresponding functions. Some of these functions are subject to a li-
cence (see also
"Licences", page 60
).
Functions are allocated in WebAdminin the DSP configuration (
=ym
).
•
DECT
Operation of a DECT system on DSI interfaces with cordless phones. The voice
data must be transformed on connections between DECT and non-DECT end-
points. This process requires DSP capacity.
Purely DECT-DECT connections set up already do not require any DSP resources.
On the other hand, DSP 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 gate-
way. 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
DSP resources for the real-time processing of the call data. VoIP channels are al-
Type
Number of DSP chips
per module
Max. number of
Aastra 415 modules
Max. number of
Aastra 430 modules
SM-DSPX1
1
3
3
SM-DSPX2
2
SM-DSP1
1)
1)
Although no longer available, the module is still supported.
1
SM-DSP2
1)
2
