Prodys PortaNet Hardware And Reference Manual page 54

VI.4 ENC: Encoder algorithm selection menu
From this option we can choose the audio Encoder algorithms. Note that the
PortaNet can operate as a DUAL codec
simultaneous communications that are totally independent and so it is possible to
configure the second Encoder. However, there are operational restrictions in the
configuration of Encoder 2 that depend on the algorithm and mode already
selected for Encoder 1.
If we select ENC from the main menu the following is displayed:
S E T E N C O D I N G M O D E
{ E N C O D E R 1 } E N C O D E R 2
ENCODER 2 is only available if the unit is configured as a DUAL codec.
VI.4.1 Configuration of Encoder 1
The configuration of Encoder 1 (and Encoder 2 where available) is done in steps,
starting with the selection of an algorithm and following on with the different
parameters that relate to that particular algorithm. The PortaNet menu will
always only display the options and parameters that are relevant to each
algorithm's configuration. Additionally there are certain restrictions associated
with the communication interface selected. For example, uncompressed audio
can only be selected when the NET is set to IP. In the following description
these restrictions are outlined for each algorithm.
Selecting the algorithm
For Encoder 1 the following options are available:
AUT: Automatic Mode. The Encoder adopts the same mode as the Decoder.
PCM : Linear audio with no compression.
G711 : Compatible with the telephone standard.
G722 : Low delay ADPCM compression, appropriate for voice.
MPL2 : MPEG 1,2 Layer II.
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DUAL codec: PortaNet is able to operate as a DUAL codec over ISDN and over IP (when
configured in 'DOUBLE' mode).
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. In this case, it is possible to have two
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