The following information is pulled from the ACU Techincal User Guide. For a comprehensive overview of the ACU, please see the full guide:
View GuideACUs provide remote interfacing of audio and I/O peripherals over ASTi's Ethernet-based ACENet architecture. All audio and I/O is digitally distributed between ACUs and Telestra servers for maximum noise rejection and reliability. The ACU is desirable in situations that require enhanced control interfaces (discrete analog and digital interfaces) for example, sensing dual press-to-talk (PTT) inputs (radio and intercom) or where the operator interface is the ASTi 4-channel selector PTT.
A comprehensive overview of the ACU can be found in the Technical User Guide
| Compatible with | Telestra |
| Part Number | ACU-1U-XX |
| Dimensions | 12" length x 16.9" width x 1.72" height Width with the rackmount kit is 19" |
| Weight | Weight will vary depending on channel options. The maximum weight will not exceed 5.50 lbs including attached mounting brackets. |
| Power Source | Individual power supply, included. |
| Power Consumption | 15VDC, 3 A |
| Mean Time Between Failure (MTBF) | 246,493 Hours (COTS) 122,999 Hours (Mil) |
| Impedance | 32 kΩ |
| Level | +/- 2.25 Vp-p max. at 0 dB gain |
| Gain | -20 to +20 dB software configurable |
| Microphone Power | n/a |
| Total Harmonic Distortion (THD) + noise | 0.045696 from 20 Hz to 20 kHz input Typical: 0.040% at 1 kHz |
| Frequency Response | +/- 3 dBv from 20 Hz to 20 kHz Typical = 0.4 dBv at 20 Hz, -2.7 dBv at 20 kHz |
| Common Mode Rejection | -78 dBv at 60 Hz, -56.4 dBv at 20 kHz Typical = +/- 3.5 dBv from 20 Hz to 20 kHz |
| Noise at Unity Gain | 89 dBv |
| Working Signal to Noise ratio at 20 dB headroom | 89 dBv |
| Impedance | 1.5 kΩ |
| Level | +/- 2.2 Vp-p max. 0 dB gain |
| Gain | 0 to +52 dB software configurable |
| Microphone Power | Selectable T-Power at 13.8 VDC, current limited with 3.24 kΩ. Software enabled/disabled. |
| Total Harmonic Distortion (THD) + noise | 0.064% from 20 Hz to 20 kHz Typical: -0.048% at 1 kHz |
| Frequency Response | +/- 3.5 dBv from 20 Hz to 20 kHz Typical = +/- 3.5 dBv from 20 Hz to 20 kHz |
| Common Mode Rejection | -67 dBv/td> |
| Noise at Unity Gain | 60 dBv |
| Working Signal to Noise ratio at 20 dB headroom | 60 dBv |
WARNING! Do not plug a microphone requiring phantom power into an ACU device, this will cause damage to the microphone! If you are unsure of the difference between mic-power and phantom power, please contact the microphone manufacturer or ASTi before connecting equipment. Note: Most military headsets use mic-power
| Impedance | 12 Ω |
| Current | 0.2125 A at 8 Ω |
| Level | 1.7 VAC rms into 8 Ω |
| Power | 1 lead: 0.36 W 2 leads: 0.5 W |
| Frequency Response | +/- 3 dB from 20 Hz to 20 kHz |
| Total Harmonic Distortion(THD) + Noise | < 0.07% |
| Max. Output Signal | 10 Vpp |
This device works as a transportation mechanism, passing audio from one device to another until it reaches the headset or PC; this device does not store the audio.
| Type | Size | User Modifiable | Function | Process to Clear |
|---|---|---|---|---|
| Micro-controller Internal SRAM | 4 KB | No | Used as RAM for an internal MCU | Remove Power Count to 30 Restore Power |
| Type | Size | User Modifiable | Function | Process to Clear |
|---|---|---|---|---|
| Micro-controller Internal Flash | 128 KB | Yes | Firmware | None |
| Micro-controller Internal EEPROM | 8 KB | Yes | Store Settings | None |
| Flash | 4 Mb | Yes | Firmware | None |
RJ-12 Pinout
(Serial Connection)
DB-15 Connector
(Audio Interface)
RJ-45 Pinout
(ACENet Connection)