Technical data

SunOS 5.5 Devices dbri(7D)
ERRORS In addition to the errors described in audio(7I), an open() will fail if:
ENODEV The driver is unable to communicate with the SpeakerBox, possibly
because it is currently not pluggedin.
FILES The physical device names are very system dependent and are rarely used by program-
mers. For example:
/devices/sbus@1,f8000000/SUNW,DBRIe@1,10000:te,b2.
The programmer should instead use the generic device names listed below:
/dev/audio - symlink to the system’s primary audio device, not necessarily a
dbri based audio device
/dev/audioctl - control device for the above audio device.
/dev/sound/0∗ - represents the first audio device on the system and is not
necessarily based on dbri or SpeakerBox.
/dev/sound/0 - first audio device in the system.
/dev/sound/0ctl - audio control for above device
/dev/isdn/0/∗ - represents the firstISDN device on the system and any associ-
ated interfaces. This device is not necessarily based on dbri.
/dev/isdn/0/te/mgt - TE management device
/dev/isdn/0/te/d - TE D-channel
/dev/isdn/0/te/b1 - TE B1-channel
/dev/isdn/0/te/b2 - TE B2-channel
/dev/isdn/0/nt/mgt - NT managementdevice
/dev/isdn/0/nt/d - NT D-channel
/dev/isdn/0/nt/b1 - NT B1-channel
/dev/isdn/0/nt/b2 - NT B2-channel
/dev/isdn/0/aux/0 - SpeakerBox or onboard Multimedia Codec
/dev/isdn/0/aux/0ctl - Control device for SpeakerBox or onboard Multimedia Codec
/usr/demo/SOUND - audio demonstration programs and other files.
SEE ALSO ioctl(2), audio(7I), isdnio(7I), streamio(7I)
AT&T Microelectronics data sheet for the T5900FC Sun Dual Basic Rate ISDN Interface.
Crystal Semiconductor, Inc., data sheet for the CS4215 16-Bit, 48 kHz, Multimedia Audio
Codec Publication number DS76PP5.
NOTES Due to hardware restrictions, it is impossible to reduce the record gain to 0. A valid
input signal is still received at the lowest gain setting the Multimedia Codec allows. For
security reasons, the dbri driver disallows a record gain value of 0. This is to provide
feedback to the user that such a setting is not possible and that a valid input signal is still
being received. An attempt to set the record gain to 0 will result in the lowest possible
non-zero gain. The audio_info structure will be updated with this value when the
AUDIO_SETINFO ioctl returns.
modified 27 Feb 1995 7D-75