Prontonet User’s Manual v410 95
will start the streaming of audio data immediately. If there is no receiver
connected, the audio will simply not be received. As soon as receivers are
connected to the multicast group they will receive the audio data that is being
streamed. Equally, if the receiver is connected to a multicast group where the
transmitter is not operating yet, the audio output is muted.
There should only ever be one transmitter connected to a MULTICAST
group or else audio reception errors will occur.
For transmitting MULTICAST audio the Prodys proprietary protocol
“Prodys eXtended Real Time Protocol (PX-RTP) will be used.
The ProntoNet transmitter cannot be in automatic mode.
To guarantee a constant delay all the units must synchronise their
clocks. Each receiver will activate a clock-sync algorithm that adjusts its
PLL.
To end a communication press and hold the CALL 1 key for more than
one second.
V.9 ProntoNet operating as an ISDN codec
The ProntoNet as ISDN codec is very similar to the Pronto 3, therefore those
users that are familiar with the Pronto 3 will find it easy to operate the ProntoNet
over ISDN.
The most important points that a user must have in mind for this mode are as
follows:
1. ISDN interface: The ISDN interface of the ProntoNet allows
connection to a basic rate ISDN line. This interface allows the user two
bi-directional channels with a bandwidth of 64 Kbps in each direction.
There is an additional channel of 16 Kbps that is used for signalling.
This is why a basic rate connection is sometimes represented as 2B+D.
The ProntoNet identifies each B channel as Line 1 and Line 2
respectively.
2. Dual Codec: The ProntoNet can operate as “DUAL CODEC”, which
means it can establish two totally independent communications via
each B channel at 64 Kbps. This is only possible when each B channel
or communication line uses a MONO mode compression algorithm in
this situation the ProntoNet will be able to use two Encoders and two
Decoders independently. This limitation is imposed by the fact that
there is only one stereo audio input and one stereo audio output.
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