User`s manual

EAGLE - ANNEX A.4. ANCILLARY DATA CHANNEL 67
In summary:
 The external equipment will be connected with a fixed baud rate of 115200 or 9600 or 4800
or 2400 or 1200 bps to the ANCILLARY port of the audio codec.
 The audio codec will establish a permanent link at 256 Kbps, 128 Kbps or 64 Kbps with the
remote audio codec, selecting an operating (audio encoding) mode that allows the use of
the data channel.
 Configuration of the data channel will be done selecting the effective bit rate, and enabling
tx, rx or both.
AEQ AUDIO CODECS
The EAGLE audio codec has TWO independent ancillary ports. This means that both ports can
operate simultaneously.
- Ancillary data port1 is available in the following modes:
- MPEG128, MPEG256,
- MPEG64, G722/H221 and AEQ3.5 on circuit 1
- Ancillary data port2 is available in the following modes:
- MPEG64 on circuit 2
In G711, G722 STAT and AEQ LD-2 audio encoding modes, the auxiliary data channel is not
available.
The COURSE has a SINGLE ancillary port for each audio codec card, and is available in the
following modes:
- MPEG128, MPEG256,
- MPEG64, G722/H221 and AEQ3.5 on circuit 1
- MPEG64, G722/H221 and AEQ3.5 on circuit 2
In G711, G722 STAT and AEQ LD-2 audio encoding modes, the auxiliary data channel is not
available.
The SWING portable audio codec has a SINGLE ancillary port, and is available in the following
modes:
- MPEG128,
- MPEG64, G722/H221 and AEQ3.5
In G711, G722 STAT and AEQ LD-2 audio encoding modes, the auxiliary data channel is not
available.
CONFIGURATION OF THE EFFECTIVE BIT RATE IN THE DIFFERENT MODES
To select the effective bit rate through the software, there are three possible modes:
Minimum: The data channel has an effective bit rate of 1200 bauds. In this mode, compatibility
is maintained with earlier models of audio codecs (ACD5001 and MPAC02) in MPEG 64 Kbps
and 128 Kbps modes.
Maximum: The bandwidth for the data channel occupies nearly all of the link’s capacity, so the
audio transmitted is very low quality or non-existent.
Custom: The effective bit rate for the data-channel is programmed by the user through REAL
TIME CONTROL software. According to the type of encoding chosen, a menu is displayed with
the effective bit rate values that can be selected. The greater the capacity of the data channel,
the smaller the channel capacity for the audio circuits, and the lower the audio quality.