Prodys PortaNet Hardware And Reference Manual page 61

VI.5 Configuration of Encoder 2
Only available in ISDN mode (NET = ISDN) or if NET = IP and Double Mode
is set.
The Encoder 2 is only available if Encoder 1 is set to a MONO Encoder,
and the bit rate is set to 64 Kbps.
Only a bit rate of 64 Kbps is available if ISDN. No restriction for IP
networks.
Only the MONO mode is available.
PCM,apt-X and AAC HE compression modes are not supported in Double
mode.
Only 16 kHz sampling is supported for Apt-X compression modes.
Therefore in Double mode the following options are available:
AUT : Automatic Mode. This means that the Encoder adopts the same mode
as the Decoder. (This is equivalent to the automatic dependent mode of the
Pronto 3).
G711 : Compatible with the telephone standard.
G722 : Low delay ADPCM Algorithm appropriate for voice.
MPL2 : MPEG 1,2 Layer II.
MPL3 : MPEG 1,2 Layer III.
AAC2LC: AAC MPEG 2 Low Complexity.
AAC4LC: AAC MPEG 4 Low Complexity.
AAC4LD: AAC MPEG 4 Low Delay.
TM
AptX @ 16kHz sampling: Proprietary algorithm based on ADPCM, with
very low delay.
Prodys S.L. Tel: +34 91 6896880 Θ Fax: +34 91 6943777 Θ Email:
NOTICE – ENCODER2 RESTRICTIONS
Page 61
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