[asterisk-embedded] Realistic transcoding expectations on Blackfin platform

[Stephen Davies]

Hi,

What's a reasonable expectation on how many concurrent calls I can expect a
Blackfin appliance (eg AA50, Xorcom etc) to handle when transcoding
alaw/ulaw to and from GSM.

I'm out of steam at about 5 or 6 calls and that's a bit disappointing for
me.

Calls are coming in on FXO port and going out of IAX using GSM.

Regards,
Steve
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[Noël Bouchard]

Hello Stephen

You can have a good idea with the asterisk command :
show translation

Please post the output of it ..

Here is the output for a WRTSL54GS router with Broadcom CPU @ 266

Translation times between formats (in milliseconds) for one second of data
Source Format (Rows) Destination Format (Columns)

g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722
g723 - - - - - - - - - - - - -
gsm - - 18 19 - - 17 - - - - - -
ulaw - 123 - 1 - - 1 - - - - - -
alaw - 124 1 - - - 2 - - - - - -
g726aal2 - - - - - - - - - - - - -
adpcm - - - - - - - - - - - - -
slin - 122 1 2 - - - - - - - - -

Here: Ulaw to GSM takes 123 msec to translate 1 sec of audio (so a max
of maybe 8 streams
and probably less to alloe for other CPU tasks)

and GSM to ulaw takes 18 msecs for 1 second.

+----------+

Isn't i possible to avoid translation ? If your FXO can be set to ude
this codec
no translation would be needed ... (?)

Noel

Post by Stephen Davies
Hi,
What's a reasonable expectation on how many concurrent calls I can
expect a Blackfin appliance (eg AA50, Xorcom etc) to handle when
transcoding alaw/ulaw to and from GSM.
I'm out of steam at about 5 or 6 calls and that's a bit disappointing
for me.
Calls are coming in on FXO port and going out of IAX using GSM.
Regards,
Steve
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