Technical data

ASTi DACS: Operation & Maintenance Manual (Version 4, Rev. B.1) www.asti-usa.com

Initialization: When the DACS powers up or when the Model Builder application software is

booted, the RIUs will spend a few seconds synchronizing to the TDM card. The synchronization

status is indicated by the green and red LEDs on the RIU. If the red LED is solid, there are no

sync pulses on the TDM ring. If the red LED is ﬂashing, sync pulses exist on the TDM, but the

RIU cannot synchronize with the DACS’ Model Builder software. During the synchronization

process, the green LED will ﬂash at a 5Hz rate. When the light begins blinking at 1 Hz, the RIU is

synchronized and ready for operation. Lights on different RIUs may blink out of phase. This is

normal.

When powering up the DACS the RIUs should be powered on at the same time or before the

DACS itself to avoid synchronization problems. If a synchronization problem occurs use the

restart feature located in the top level model builder menu or power the DACS off and then on.

Note that operation of communications panels or other devices connected to the RIUs will not be

operational unless the Model Server Platform (if used in legacy installations) and network are also

operational.

Audio and I/O Equipment Connection

External audio and I/O equipment such as headsets, microphones, ampliﬁers, preampliﬁers, VCR

audio in/out, tape players, PTT switches, wire line adapters, etc. are connected either directly to

the DACS Waveform Synthesizers and RIUs or through various audio interface equipment.

For systems with Waveform Synthesizers, each card or module provides up to eight channels of

analog audio inputs and outputs (eight inputs and eight outputs). Connection is made via a 37 pin,

female “D” connector located on the module face plate. Connector pin-out is shown in Appendix

A and on the Waveform Synthesizer Engineering Drawing supplied with the DACS.

For systems with RIUs, each RIU provides 4 channels of analog audio inputs and outputs. A digi-

tal input and digital output is also provided with each audio channel.

Connection is made via a series of 9 pin, female “D” connectors located on the RIU face plate

with each connector providing one audio input, one audio output, one digital input, and one digital

output. Connector pin-out is shown in Appendix A.

External ampliﬁer, preampliﬁer, headset, microphone, or speaker connection is not required to run

the Model Builder sound model generation software. Sound models can be developed and run

without external equipment connection.

Audio Inputs

Both the Waveform Synthesizer and RIU analog inputs are high impedance (>10kOhms), full dif-

ferential (balanced) inputs. The RIU inputs are capacitively coupled.

Maximum Waveform Synthesizer input voltage is 3Vp-p. Maximum RIU input voltage is 4.5Vp-