Prontonet User’s Manual v410 90
V.6 ProntoNet working as a “DUAL CODEC”
When we select ISDN as the communications interface, it is possible to establish
two, totally independent MONO connections for each 64 Kbps B Channel. This
means that for each channel or line of communication (Line 1 or Line 2 as seen
by the ProntoNet) it is possible to send an audio signal encoded with any of the
available codec algorithms. The menu offers the option to configure Encoder 1
and Encoder 2 separately. However, the user must remember that in this mode
is only possible to work with MONO signals on each channel, given that
ProntoNet only has one stereo audio input and one stereo audio output. To
avoid incorrect configuration there are therefore certain restrictions while
working with the ProntoNet as a “DUAL CODEC”:
If Encoder 1 is configured in any mode other than DUAL or STEREO/JSTEREO
the Encoder 2 option is disabled and the ProntoNet will not work as a “DUAL
CODEC”.
The Encoder 2 is not available also when NET = ISDN and bit rate = 128 Kbps.
Encoder 2 can only be configured to work in MONO.
The next section looks at how the ProntoNet operates as a ISDN CODEC in more
detail, and will detail other restrictions that need consideration when we
configure Encoder 1 in DUAL or STEREO modes, or when it receives calls from
other units that are working in any of these modes.
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