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Remote Interface Unit (RIU)

Final Version: 4.2.2

Technical User Guide

The following information is pulled from the RIU Techincal User Guide. For a comprehensive overview of the RIU, please see the full guide:

View Guide

The RIU is a legacy hardware component of ASTi's DACS audio and communications simulation system.

A comprehensive overview of the RIU can be found in the Technical User Guide

General Specifications

Compatible with DACS
Dimensions 5.5"W x 1.5"H x 7.5"D
Mounting Desktop, 19" rackmount kit available
Power +5VDC, 1.1A max, fuse protected (plug-in AC/DC converter supplied with each unit)
Audio Connection 9 pin female sub-min "D" (1 audio input/output and 1 digital input/output each connector)
Mean Time Between Failure (MTBF) 400,000 hours

Audio Input/Output

Audio Inputs (per channel)

Impedance > 10 kOhm, Balanced
Level +/- 2.25V peak max
Gain User configured 0-60 dB

Audio Output

Impedance Balanced
Level +/- 2.25V peak max
Power 1W RMS into 8 Ohm bridged load, 250mW into 8 Ohm single ended

Digital Input/Output

Digital Inputs

Quantity One per audio channel
Configuration 2 pins each audio connector (ground and sense pin)

Digital Outputs

Quantity One per audio channel
Configuration Opto-Isolated, 120mA, 2 pins on each audio connector

TDM Ring

Connection Standard RJ45 Jacks (8 pin)
Maximums 300 ft. length, 14 RIUs/ring, 24 operators/ring
TDM Cabling Standard 4 pair, Category 5 twisted pair network cable

Serial Ports

Quantity 2
Type RS-422
Connection Standard RJ12 Jack (6 pin)


ASTi warrants to the buyer and its customers that all items delivered and all services rendered hereunder will conform to the requirements hereof and will be free from defects. In addition to other remedies that may be available at law or in equity, the buyer may return to ASTi any nonconforming or defective items or require correction or replacement of the item, all at ASTi’s risk and expense. If the buyer does not require correction or replacement of nonconforming or defective items, ASTi shall repay such portion of the contract price or such additional amount as is equitable under the circumstances.

Warranty period: 12 months from shipment date