Black Box ACU4222A - Manual (Page 38)

APPENDIX E: SPECIFICATIONS
37
Serial Interface
Max Baud Rate Supported 19.2K Baud
Serial Data Format Transparent
Signals Transferred TX, RX, RTS, CTS, DTR, DSR
Local Unit Connector DB9 Female (DCE)
Remote Unit Connector DB9 Male (DTE)
Audio Interface
Description Bi-directional stereo audio link
Transmission method Digitized virtually CD quality audio (16-bit, 38.4kHz)
Signal levels Line level (4 Volts Pk-Pk maximum)
Input Impedance 47k Ω
Local Unit Connectors 2x3.5mm stereo jack socket (Line In & Line Out)
Remote Unit connectors 2x3.5mm stereo jack socket (Line/Mic In & Line Out)
Microphone Support Microphone may be connected to Remote Unit
Pullup resistor provides bias for condenser microphone
Option to set microphone amplification to +17dB
Power Requirements
Local Unit 5V at up to 275mA supplied by USB port
External PSU may also be connected to 2.1mm DC Jack
(Center Positive)
Over Voltage Protection: >5.6V
Under Voltage Protection: <4.3V
Remote Unit 5V Regulated, 20W, PSU included
(certified to all relevant safety standards)
Universal IEC Input
Connector: 2.1mm DC Jack (Center Positive)
Remote unit takes 250mA, remainder available for
connected USB devices.
Over Voltage Protection: >5.6V