Technical data

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SunOS 5.5 Devices dbri(7D)

The Sun Microphone is recommended for normal desktop audio recording. Whenthe

Sun Microphone is used in conjunction with the SpeakerBox, the microphone battery is

bypassed. Other audio sources may be recorded by connecting their line output to the

SpeakerBox line input (audio sources may also be connected from their headphone out-

put if the volume is adjusted properly).

ISDN Interfaces The DBRI controller offers two Basic Rate ISDN (BRI) interfaces. One is a BRI Terminal

Equipment (TE) interface and the other is a BRI Network Termination (NT) interface.

The NT connector is switched by a relay so that when system power is not available or

when software is not accessing the NT port, the TE and NT connectors are electrically

connected and devices plugged into the NT port will be on the same BRI passive bus.

Audio Data Formats

for the Multimedia

Codec/SpeakerBox

The dbri device supports the audio formats listed in the following table. When the dev-

ice is open for simultaneous play and record, the input and output data formats must

match.

Supported Audio Data Formats

Sample Rate Encoding Precision Channels

8000 Hz µ-law or A-law 8 1

9600 Hz µ-law or A-law 8 1

11025 Hz µ-law or A-law 8 1

16000 Hz µ-law or A-law 8 1

18900 Hz µ-law or A-law 8 1

22050 Hz µ-law or A-law 8 1

32000 Hz µ-law or A-law 8 1

37800 Hz µ-law or A-law 8 1

44100 Hz µ-law or A-law 8 1

48000 Hz µ-law or A-law 8 1

8000 Hz linear 16 1 or 2

9600 Hz linear 16 1 or 2

11025 Hz linear 16 1 or 2

16000 Hz linear 16 1 or 2

18900 Hz linear 16 1 or 2

22050 Hz linear 16 1 or 2

32000 Hz linear 16 1 or 2

37800 Hz linear 16 1 or 2

44100 Hz linear 16 1 or 2

48000 Hz linear 16 1 or 2

Audio Data Formats

for BRI Interfeces

ISDN channels implement a subset of audio semantics. The preferred ioctls for querying

or setting the format of a BRI channel are ISDN_GET_FORMAT, ISDN_SET_FORMAT, and

ISDN_SET_CHANNEL. In particular, there is no audio format described in audio(7I) that

covers HDLC or transparent data. The dbri driver maps HDLC and transparent data to

AUDIO_ENCODING_NONE. ISDN D-channelsare always conﬁgured for HDLC encoding

of data. The programmer should interpret an encoding value of

AUDIO_ENCODING_NONE as an indication that the fd is not being used to transfer audio

data.

modiﬁed 27 Feb 1995 7D-73