Audio Capabilities - Digital Equipment 300 Series AXP Reference Manual

Integrated Services Digital Network (ISDN)
Use of ISDN D
Channels

Audio Capabilities

Audio Feature
DECsound
Application
Audio
Conferencing
Software
1–12
The D channel uses a protocol standardized by the International
Telegraph and Telephone Consultative Committee (CCITT) for
setting up these D-Channel connections. The D channel can also
be used for low-speed packet transmission.
The DEC 3000 Model 300 Series AXP system features telephone-
quality audio input and output capabilities, including a built-in
speaker.
You can attach a microphone, headphone, handset, headset,
or externally-powered speakers to the audio port. Normally,
the RS232 audio port is used in asynchronous mode. However,
support for X.25 synchronous communications is available, but is
operating-system-dependent.
The port pinouts for the audio jack on the back of the system
unit are provided in Appendix C. Chapter 4 describes ISDN tests
that you can issue from console mode: for example, to repeat,
record and playback audio messages.
The DECsound application, shipped with your system as part
of the DECwindows Motif for OpenVMS AXP software, is an
easy-to-use software application that lets you play back recorded
messages, record audio messages, mail recorded messages, and
include recorded messages in compound documents.
Multimedia Services software and the DECspin audio
conferencing software are also shipped with your system as
part of the DEC OSF/1 software. These free applications let
you take advantage of the voice-quality base audio on your
system. The audio headset (provided in the parts kit with some
models) is for you to use in the quiet of your office with these
new applications. See the information sheet provided with the
headset for instructions on how to start the applications.