flexAI Hardware
flexAI hardware manual

AIXpressor - Overview

Overview
Introduction
The AIXpressor is a flexible, software-defined audio processing and interface platform. Unlike traditional stand-alone processors, where functionality is closely tied to fixed hardware and firmware, AIXpressor runs the flexAI software platform. This allows processing functions, codecs, metadata tools, interfaces, and other features to be added or extended through software updates and licensing.
AIXpressor combines real-time audio processing with a wide range of physical and IP-based audio interfaces. Native Audio over IP support includes Livewire+, AES67, and SMPTE ST 2110, while conventional interfaces such as analog audio, AES3, and MADI provide connectivity to existing baseband infrastructure.
This makes AIXpressor suitable both as a stand-alone audio processor and as an interface between traditional audio systems and IP-based environments.
Hardware
AIXpressor is built around a high-performance x86 multi-core processing platform. The main processor handles real-time audio processing, measurement, routing, codecs, Audio over IP, system services, and the web-based user interface.
A high-performance FPGA manages the connection between the processing system and the physical audio interfaces.
The main hardware features include:
Chassis: 19-inch, 1RU rack-mount unit
Display: 16.5 cm touch-sensitive front-panel display
Status Indicators: Multicolor system status indication
Power Supplies: Redundant power supplies with individual power controls
Headphones: 6.3 mm (1/4") front-panel headphone output
Ethernet: Four Gigabit Ethernet ports for control, management, and Audio over IP
USB Type A: One front-panel and one rear-panel USB 3.0 connector
USB Type B: One rear-panel USB 2.0 connector
External Sync: BNC input supporting Word Clock, AES3/AES11, Black Burst, and Tri-Level Sync
On-board Audio Interfaces
AIXpressor includes the following audio interfaces as standard:
AES3: 8 inputs / 8 outputs or 4 inputs / 12 outputs
Analog: 8 inputs / 8 outputs or 4 inputs / 12 outputs
2 SFP interfaces: MADI or Jünger Audio tieLight, depending on the installed SFP modules
Audio over IP: Native support for Livewire+, AES67, and SMPTE ST 2110
MADI and tieLight require different SFP module types. Refer to the corresponding interface section for details.
Expansion Slots
Four expansion slots allow additional physical interfaces to be installed. Each slot provides connectivity for high-channel-count audio applications.
Available interface modules may include:
SD/HD/3G-SDI
Optical or coaxial MADI
Audinate Dante
AES3 I/O
Analog I/O
Analog outputs
Microphone inputs
The exact channel count and capabilities depend on the installed interface module.
Software
AIXpressor runs the flexAI software platform. flexAI separates audio processing functionality from the physical hardware, allowing new applications and features to be added as the software platform evolves.
Processing modules are available in different channel configurations where applicable, ranging from mono and stereo to surround and immersive formats such as 7.1.4.
Available and optional processing functions may include:
Level Magic loudness management based on ITU-R BS.1770 and related international loudness standards
True Peak Limiting
Spectral Signature dynamic filtering
Compression
Parametric equalization and filtering
Phase rotation
De-essing
Expansion and gating
Voice-over mixing
Automatic mixing
Multichannel and immersive upmixing
Automatic failover
FM conditioning
Object-based metadata authoring and rendering
Audio codecs
The exact set of available functions depends on the installed flexAI software version and licenses.
Audio I/O and Routing
AIXpressor provides analog, AES3, MADI, and Audio over IP connectivity as part of its standard hardware. Additional interfaces can be added using the four expansion slots.
The built-in AES3 and analog interfaces can each be configured as either 8 Inputs / 8 Outputs or 4 Inputs / 12 Outputs. The 4-in / 12-out configuration provides additional output capacity for multichannel and immersive audio formats such as 7.1.4.
The two SFP interfaces can be configured for MADI or the proprietary Jünger Audio tieLight interface. tieLight provides a high-channel-count, low-latency optical connection between compatible systems.
Audio from physical and IP-based interfaces is available to the internal flexAI routing system. Routing operates at channel level, allowing signals from different interface types to be freely combined, rearranged, processed, and routed to available destinations.
Routing configurations can also be stored and recalled as presets.
Control
AIXpressor is primarily operated through its browser-based web interface.
For integration with external control, automation, and monitoring systems, flexAI supports protocols including:
Ember+ for external parameter control
NMOS IS-04 and IS-05 for discovery and connection management in IP-based environments
SNMP for system monitoring and hardware health information
The available control functions may depend on the installed software version and system configuration.
Applications and Use Cases
The flexible combination of processing, routing, conventional audio interfaces, and Audio over IP allows AIXpressor to be used in a wide range of broadcast and professional audio applications.
Typical applications include:
Ingest and contribution
Radio and television studios
Master control rooms
Playout systems
Loudness and dynamics processing
Format conversion
Audio over IP gateways
Multichannel and immersive audio workflows
Rebroadcasting and distribution
Centralized or distributed audio processing
AIXpressor can operate as a dedicated stand-alone processor or as part of a larger flexAI installation with multiple interconnected processing systems.

Physical Installation
Physical Installation
AIXpressor is a 1RU, 19-inch rack-mount unit intended for permanent installation in a standard equipment rack. Secure the unit to the rack using four suitable rack screws.
AIXpressor is actively cooled. Viewed from the front, cooling air is drawn in on the left-hand side of the unit and exhausted on the right-hand side. Make sure that the corresponding ventilation openings are not obstructed and that sufficient airflow is available around the unit.
Additional free rack space above or below the AIXpressor is normally not required, provided that adequate ventilation is maintained. In installations with high ambient temperatures or restricted airflow, additional spacing may help improve cooling.
Power
AIXpressor is equipped with two redundant power supplies, each with its own IEC mains inlet and On/Off switch.
For redundant operation, connect both power supplies. If one power supply or its mains feed fails, the second supply can continue to power the unit.
For installations requiring maximum availability, connect the two power supplies to independent mains circuits whenever possible. Ideally, the circuits should also use separate UPS feeds or other suitable backup power arrangements. This helps maintain operation not only in case of a power supply failure, but also if one mains circuit becomes unavailable.
Each power supply can be switched on and off independently.
The power supply modules are located inside the chassis. Replacing a power supply therefore requires opening the unit. Although replacement may technically be possible while the second power supply remains active, this is generally not practical while the unit is installed in a rack.
Important - Please read Safety Informationon proper grounding and electrical safety.

Front and Rear Panel
Front Panel
The AIXpressor front panel provides direct access to the following connections and controls:
USB: USB 3.0 Type A connector for removable storage and other supported USB devices
Headphones: 6.3 mm (1/4") stereo headphone output
Display: 1440 × 240 TFT touch display for local operation and status information
Rear Panel
The rear panel provides power, network, synchronization, audio I/O, and expansion connections.
Power
Redundant Power Supplies: Two auto-ranging mains inputs with individual power switches
The two power supplies operate redundantly and share the system load during normal operation.
For maximum redundancy, connect the two power supplies to independent mains circuits as described in the Power section.
Network
Ethernet: Four Gigabit Ethernet RJ45 ports for control, management, and Audio over IP
LAN 3 and LAN 4 are internally connected through an integrated network switch.
The assignment of the network ports depends on the system and AoIP configuration.
USB and Service
USB Type A: One USB 3.0 Type A connector
USB Type B: One USB 2.0 Type B connector; currently unused
Status LED: Provides a general indication of the system state. Green indicates normal operation.
Init / Reset: Service function intended for use in consultation with Jünger Audio support.
MADI / tieLight
Two SFP cages provide the built-in MADI / tieLight interfaces.
The operating mode of each interface is selected in the software. MADI and tieLight require different SFP module types.
Depending on the installed module, MADI connections can be provided as optical single-mode, optical multi-mode, or coaxial BNC interfaces.
External Synchronization
A 75 Ω BNC connector provides the external synchronization input.
Supported synchronization formats include:
Word Clock
AES3 / AES11
Black Burst
Tri-Level Sync
AES3 I/O
The built-in AES3 interface uses a 25-pin D-Sub female connector.
It can be configured as:
8 AES3 inputs / 8 AES3 outputs, or
4 AES3 inputs / 12 AES3 outputs
AES3 is also commonly referred to as AES/EBU.
Analog I/O
The built-in analog interfaces use two 25-pin D-Sub female connectors:
One connector provides 8 balanced analog outputs.
The second connector provides 8 balanced analog inputs, or can be configured as 4 balanced inputs / 4 balanced outputs.
This allows the complete analog interface to operate as either:
8 inputs / 8 outputs, or
4 inputs / 12 outputs
Expansion Slots
AIXpressor provides four interface expansion slots, IF 1 – IF 4, for optional interface boards.
Each slot supports up to 64 bidirectional audio channels, depending on the installed interface module.
Available expansion modules include interfaces for applications such as SDI, MADI, Dante, AES3, analog audio, and microphone inputs.

Network Connections
General Network Considerations
By default, DHCP is enabled on all AIXpressor network interfaces. When connected to a network with an active DHCP server, each interface automatically obtains an IP configuration.
The IP address assigned to LAN 1 CTRL is shown on the front-panel display. If no DHCP server is available, a static IPv4 address can be configured for LAN 1 CTRL from the front panel to establish an initial network connection.
AIXpressor also supports Zero Configuration Networking (mDNS/Bonjour) and can therefore be reached by its 
.local host name on compatible networks.
Note - The network settings available from the front panel apply to \*\*LAN 1 CTRL\*\* only.
Note - When integrating the AIXpressor into a managed network, coordinate the required IP addressing and network settings with the network administrator.
Accessing the Web Interface
To connect using the IP address shown on the front panel, enter the address in a web browser:
https://<IP-address>
If the AIXpressor is using its factory-installed self-signed certificate, the browser may initially display a certificate warning.
If your computer supports mDNS, the unit can alternatively be reached using its 
.local host name.
For example:
https://AIXpressor-00080.local
The exact host name is shown on the front-panel display.
The AIXpressor user interface is web-based and can be accessed with a modern desktop or mobile web browser.
Setting a Static IP Address from the Front Panel
A static IP address can be configured from the touch-sensitive front panel. This is useful when no DHCP server is available or when the AIXpressor must first be placed on a specific network before the web interface can be reached.
Open the Menu on the front panel.
Select Network to display the LAN 1 CTRL settings.
Select Edit Static IP Address.
Set the required IP Address and Subnet Mask.
Select Apply to save the configuration.

Safety Information
Critical information - Please read carefully.
Safety Information
Electrical Safety
Safety Classification: AIXpressor is a Class I grounded product and must be operated with a protective earth connection.
Mains Connection: Connect the unit only to properly grounded mains outlets. The power cords must remain accessible so that the unit can be disconnected from mains power when required.
Power Switches: Each power supply has its own On/Off switch located next to the corresponding mains inlet on the rear panel. The switch positions are marked I for On and O for Off.
Redundant Power Supplies: AIXpressor is equipped with two power supplies and therefore uses two mains power cords. Both connections must be disconnected to completely remove mains power from the unit.
Protection from Water: Do not expose the unit to dripping or splashing water. Do not place containers filled with liquid on or directly above the unit.
Service Safety
Service work should only be carried out by qualified personnel.
Before opening or servicing the unit:
Switch off both power supplies.
Disconnect both mains power cords.
Make sure that the power cords cannot be reconnected accidentally while service work is in progress.
Do not perform service work on the unit while it is connected to mains power unless the procedure specifically requires this and is carried out by suitably qualified personnel.
Installation and Operation
Install AIXpressor on a stable surface or securely mount it in a standard 19-inch equipment rack.
When installed in a rack, make sure that the unit is adequately supported and securely fastened.
AIXpressor is actively cooled. Viewed from the front, cooling air enters on the left-hand side and exits on the right-hand side. Keep these ventilation openings clear and provide sufficient airflow around the unit.
Do not operate the unit with covers or panels removed.
Use only mains power cords that are suitable for the product and approved for use in the country or region of installation.
If the unit, power cords, connectors, or other components appear damaged, disconnect the unit from mains power and have it inspected by qualified service personnel before further use.
Internal Battery
AIXpressor contains an internal lithium battery.
The battery must only be replaced with the specified type and by qualified service personnel. Using an incorrect battery type or installing it incorrectly may present a risk of fire or explosion.

AIXpressor - Technical Data

General
Multi-channel audio processor
Rear panel AES, analog, MADI, tieLight I/O
3k x 3k cross-point audio router
Front panel headphone jack
Expandable by hardware option boards
Versatile audio processing via licensed algorithms
Audio Sample Rate
48kHz
+/- 150ppm sync input capture, +/- 25ppm master-sync stability
AES/EBU Inputs
Relevant specifications comply with AES3-X-2009, IEC 60985, and AES11-2009
4 stereo channels (4 or 2 channel inputs switchable) on D-Sub 25 connector
24-bit transparent forwarding of PCM and compressed audio without optional SRC (sample rate converter)
24-bit PCM with SRC activated
Impedance = 75Ohm single-ended
Input level = 0.3 ... 5Vpp @ 75Ohm single-ended
Sample Rate Converter (SRC) = THD+N -120dB @ 0dBFS, 1kHz, latency <0.3ms
AES/EBU Outputs
Relevant specifications comply with AES3-X-2009, IEC 60985, and AES11-2009
4 stereo channels (4 or 6 channel outputs switchable) on Sub-D 25 connector
24-bit transparent forwarding of PCM and compressed audio
Impedance = 75Ohm single-sided
Output Voltage = 1Vpp (typical) @ 75Ohm single-ended
Power fail relay bypass between AES/EBU inputs and outputs (can be deactivated by internal jumper)
SFP Sockets
SFP spec, for MADI or tieLight, not for network
SFP MADI Module
SFP spec, typically 125MBps
SFP tieLight Module
SFP spec, typically 2.5GBps
Sync Input
Multi-standard synchronization interface for AES/EBU, Wordclock, or video sync (including black burst and tri-level); complies with AES11-2009 and relevant audio or video standards.
Connector type = BNC
AES/EBU Input = 0.3 ... 5Vpp @ 75Ohm single-ended
Wordclock input = 1 ... 5Vpp @ 75Ohm single-ended
Video-sync input = 1Vpp (nominal) @ 75Ohm single-ended
Supported rates = 23.975, 24, 24.975, 25, 29.97, 30, 49.95, 50, 59.94, and 60 fps (SD and HD)
Network Interfaces
4x RJ45 connectors, 1Gbit/s Ethernet auto sense, full duplex
USB Interfaces
Front and rear USB A 3.0 connectors
Internal USB A 2.0 (for license keys)
Rear USB 2.0 connectors
Expansion Slots
4 general-purpose expansion slots for Jünger Audio Option Boards
Power Supplies
Dual power supplies with automatic fail over
85 ... 264VAC, 50 ... 60Hz, 58W (max)Network Connections
Environmental
Operating temperature = 0 ... 50°C, fan cooled
Non-operating temperature = -20 ... 70°C
Humidity < 90% non-condensing
Physical
19" x 1RU, 27cm depth
Net weight ca. 5kg
Shipping weight ca. 7.5kg

D-Sub DB-25 Pin Assignments
AES I/O
I/O Mode can be configured in the software to set the physical connectors between 8×8 I/O channels and 4×12 I/O channels.
Please note: AES3 is running digital audio in channel pairs (stereo) on one physical pin.
Pin (Female Connector)
I/O Mode: 8×8 I/O
I/O Mode: 4×12 I/O
1
Output Pair 4 +
Output Pair 4 +
2
Ground
Ground
3
Output Pair 3 -
Output Pair 3 -
4
Output Pair 2 +
Output Pair 2 +
5
Ground
Ground
6
Output Pair 1 +
Output Pair 1 +
7
Input Pair 4 +
Output Pair 6 +
8
Ground
Ground
9
Input Pair 3 -
Output Pair 5 -
10
Input Pair 2 +
Input Pair 2 +
11
Ground
Ground
12
Input Pair 1 -
Input Pair 1 -
13
Not Used
Not Used
14
Output Pair 4 -
Output Pair 4 -
15
Output Pair 3 +
Output Pair 3 +
16
Ground
Ground
17
Output Pair 2 -
Output Pair 2 -
18
Output Pair 1 +
Output Pair 1 +
19
Ground
Ground
20
Input Pair 4 -
Output Pair 6 -
21
Input Pair 3 +
Output Pair 5 +
22
Ground
Ground
23
Input Pair 2 -
Input Pair 2 -
24
Input Pair 1 +
Input Pair 1 +
25
Ground
Ground
Analog I/O
I/O Mode can be configured in the software to set the physical connectors between 8×8 I/O channels and 4×12 I/O channels. The outputs on the Analog I/O connectors thus are labeled to be the upper 4 of the total 12 outputs.
Pin (Female Connector)
Mode: 8×8 I/O
Mode: 4×12 I/O
1
Input 8 +
Output 12 +
2
Ground
Ground
3
Input 7 -
Output 11 -
4
Input 6 +
Output 10 +
5
Ground
Ground
6
Input 5 +
Output 9 +
7
Input 4 +
Input 4 +
8
Ground
Ground
9
Input 3 -
Input 3 -
10
Input 2 +
Input 2 +
11
Ground
Ground
12
Input 1 -
Input 1 -
13
Not Used
Not Used
14
Input 8 -
Output 12 -
15
Input 7 +
Output 11 +
16
Ground
Ground
17
Input 6 -
Output 10 -
18
Input 5 +
Output 9 +
19
Ground
Ground
20
Input 4 -
Input 4 -
21
Input 3 +
Input 3 +
22
Ground
Ground
23
Input 2 -
Input 2 -
24
Input 1 +
Input 1 +
25
Ground
Ground
Analog Outputs
Pin (Female Connector)
Function
1
Output 8 +
2
Ground
3
Output 7 -
4
Output 6 +
5
Ground
6
Output 5 -
7
Output 4 +
8
Ground
9
Output 3 -
10
Output 2 +
11
Ground
12
Output 1 -
13
Not Used
14
Output 8 -
15
Output 7 +
16
Ground
17
Output 6 -
18
Output 5 +
19
Ground
20
Output 4 -
21
Output 3 +
22
Ground
23
Output 2 -
24
Output 1 +
25
Ground

AES3 I/O Relay Bypass Settings
AES3 I/O Relay Bypass
The AES3 inputs and outputs provide a relay bypass feature that, when enabled, activates in the event of a power failure or upon a deliberate command from the GUI.
In order to enable the relay bypass feature, the jumpers for each AES3 pair (A) must be in place as shown in Figure 1 below. Removing the jumpers prevents relay bypass from occurring.
Figure 1 - Relay Bypass

Option Board AoIP / Dante™
Option Board AoIP / Dante™ (O_DAP_Dante_a)
Standards
Audio-over-IP (AoIP) by Dante™ Digital Audio Networking Standard; parallel operation in AES67 mode
Audio
24-bit, transparent forwarding of PCM and compressed audio
Sample rate = 44.1, 48, 88.2, 96kHz
Important - Not all sample rates are supported by the host system, please refer to the respective information.
Inputs and Outputs
2x RJ45 1Gbit/s Ethernet
Primary and secondary ports configurable as redundant or switched
Inputs = 64 channels @ 44.1 or 48kHz to AIXpressor
Outputs = 64 channels @ 44.1 or 48kHz from AIXpressor
General Features
AES67 compliant
SMPTE 2110-30 compliant
PTP v2 / v1 sync
Non-audio detection for input channels
Glitch-free Dante / SMPTE 2022-7 audio redundancy

Option Board SDI I/O
Option Board SDI I/O (O_DAP_SDI_a)
Standards
Video complies with SMPTE 424/425M (3G, Level A and B), SMPTE 292M (HD), or SMPTE 259M (SD)
Automatic format detection
Audio embedding and de-embedding complies with SMPTE 299M (3G, HD) or SMPTE 272M -AC (SD)
Metadata embedding and de-embedding complies with SMPTE 2020-2
Video Data Rate
2970/296Mbps (3G), 1485/1483.5Mbps (HD), 270Mbps (SD
Video Formats
1080p - 23.975, 24, 25, 29.97, 30, 50, 59.94, 60
1080i - 50, 59.94, 60
720p - 23.975, 24, 25, 29.97, 30, 50, 59.94, 60
625i - 50
525i - 59.94
Video Delay
User selectable 0 ... 15 frames, can be disabled
Audio
24-bit, transparent forwarding of PCM and compressed audio
Sample rate = 48kHz (SDI compliant)
Channels = 16 inputs and 16 outputs (4 groups of 4 channels each)
Delay = Embedder audio delay selectable 0 ... 320ms per channel
Metadata (RDD6)
1 channel input, 1 channel output, SDID selectable
BNC Input
Impedance = 75Ohm
Return loss = >15dB 5 ... 1485MHz; >10dB 1485 ... 2970MHz
Maximum cable length = 250m (SD), 230m (HD), 140m (3G) using Belden 1694A cable
Jitter tolerance = >0.7UI (alignment)
BNC Output
Impedance = 75Ohm
Output voltage = 0.8Vpp (typical)
Return loss = >15dB 5 ... 1485MHz; >10dB 1485 - 2970MHz
Output jitter = <0.2UI (alignment), <0.5UI (timing)
Latency
Video latency input to output = 120 ... 200 pixel, depending on video standard
Audio latency input to output, embedder and de-embedder combined = <0.6ms (HD, 3G), <2ms (SD)
General Features
Power fail relay bypass (may be enabled/disabled via GUI)
Lip-sync compensation for processed and non-processed audio signals
Dedicated routing for non-processed channels; all channels (maximum 16) can be routed to/from the device or looped through
Test pattern generator (no genlock)
Master-sync capable
ITU-R BT.1685 / ARIB STD-B39 metadata support

Option Board 8 Ch Analog Out
Option Board 8 Ch Analog Out (O_DAP_8DA_a)
Audio
24-bit D/A converter
8 output channels (for speakers)
Sample rate = 44.1, 48, 88.2, 96kHz
Important - Not all sample rates are supported by the host system, please refer to the respective information.
Analog Outputs
8 channels
Connector type = D-Sub25 female
Maximum output level (0dBFS equivalent) = 0 ... 24dBu, adjustable in 0.5dB steps
Impedance = 50Ohm (typical), differential
THD+N = -91dB @ 0dBFS = 15dBu, 1kHz
Dynamic range = >103dB (RMS)
Crosstalk attenuation = >103dB @ 0dBFS = 15dBu, 1kHz
Frequency response = 20Hz ... 20kHz (< +/-0.3dB) @ 48kHz; 20Hz ... 43kHz (< +/-0.3dB) @ 96 kHz
General Features
Power faillure glitch prevention
Balanced analog outputs
Electrical isolation between outputs and device

Option Board 4 Ch Analog I/O
Option Board 4 Ch Analog I/O (O_DAP_ADDA_a)
Audio
24-bit sigma-delta D/A converter, 24 bit D/A converter
4 input channels, 4 output channels
Sample rate = 44.1, 48kHz
Important - Not all sample rates are supported by the host system, please refer to the respective information.
Analog Inputs
4 channels
Connector type = D-Sub25 female connector
Input Level (maximum) 0dBFS equivalent = 0 ... 24dBu, adjustable in 0.5dB steps
Impedance = 20kOhm (typical), differential
THD+N = -93dB @ 0dBFS = 15dBu, 1kHz
Dynamic range = >110dB (RMS)
Crosstalk attenuation = >93dB @ 0dBFS = 15DBu, 1kHz
CMRR = >71dB @ 0dBFS = 15dBu, 1kHz
Frequency response = 20Hz ... 22kHz (< +/-0.1dB) @ 48kHz; 20Hz ... 43kHz (<+/-0.1dB) @ 96kHz
Analog Outputs
4 channels
Connector type = D-Sub25 female connector
Output level (maximum) 0dBFS equivalent = 0 ... 24dBu, adjustable in 0.5dB steps
Impedance = 50Ohm (typical) differential
THD+N = -91dB @ 0dBFS = 15dBu, 1kHz
Dynamic range = > 103dB @ 0dBFS = 15dBu, 1 kHz
Frequency response = 20Hz ... 22kHz (< +/-0.1dB) @ 48kHz; 20Hz ... 43kHz (<+/-0.1dB) @ 96kHz
General Features
Power fail relay bypass between inputs and outputs
Balanced analog inputs and outputs
Electrical isolation between inputs, outputs, and device

Option Board 4 Ch Microphone Inputs
Option Board 4 Ch Microphone Inputs (O_AIX_4MIC_a)
Analog Inputs
4 channels
Connector type = D-Sub25 female connector
Microphone or line input operation
Microphone mode @ 150 Ohm load:
input-impedance mic: 9 kOhm, electronically balanced
gain range: -10 dB (Pad), 0 dB, 10 dB ... 65 dB
phantom power: +48 V DC, individually switchable per channel
frequency response @ 48 kHz sampling rate: +/- 0.1 dB, 11 Hz to 22 kHz
dynamic range @ 10 dB gain: 115.3 dB RMS unweighted, 118.0 dB A-weighted
equivalent input noise: -128 dB
Line mode @ 40 Ohm load:
input-impedance line: 20 kOhm, electronically balanced
Common data:
analog line channel to channel isolation, 20Hz to 20kHz @ 10 dB gain: min. 118 dB
THD+N @ -3 dBFS, 1 kHz, 10 dB gain: 0,00075 %
THD+N @ -3 dBFS, 1 kHz, 40 dB gain: 0,0075 %
THD+N @ -3 dBFS, 1 kHz, max gain: 0,020 %
Connector DB-25 Pin Assignment
Pin (Female Connector)
Function
1
Not Used
2
Ground
3
Not Used
4
Not Used
5
Ground
6
Not Used
7
Input 4 +
8
Ground
9
Input 3 -
10
Input 2 +
11
Ground
12
Input 1 -
13
Not Used
14
Not Used
15
Not Used
16
Ground
17
Not Used
18
Not Used
19
Ground
20
Input 4 -
21
Input 3 +
22
Ground
23
Input 2 -
24
Input 1 +
25
Ground

Option Board AES/EBU I/O
Option Board AES/EBU I/O (O_DAP_AES_a)
Standards
Relevant specifications comply with AES3-X-2009, IEC 60985, and AES11-2009
Audio
24-bit, transparent forwarding of PCM and compressed audio (without SRC)
24 bit PCM with sample rate converter activated
Sample rate = 44.1, 48, 88.2, 96kHz (32 ... 196kHz @ inputs with SRC)
Important - Not all sample rates are supported by the host system, please refer to the respective information.
Inputs
8 channels (4 two-channel inputs)
Connector type = D-Sub25 female connector
Impedance = 110Ohm or 75Ohm, jumper selectable (110Ohm default)
Input level = 0.3 ... 5Vpp @ 110Ohm differential
Sample Rate Converter (SRC) THD+N -120dB @ 0dBFS, 1kHz; Latency <0.3ms
Outputs
8 channels (4 two-channel outputs)
Input sample rate converters (SRCs)
Electrical isolation between inputs, outputs, and device (if configured for differential mode, 110Ohm)
AES3 channel status management, non-audio detection
Master-sync capable
Connector DB-25 Pin Assignment
Please note: AES3 is running digital audio in channel pairs (stereo) on one physical pin.
Pin (Female Connector)
Function
1
Output Pair 4 +
2
Ground
3
Output Pair 3 -
4
Output Pair 2 +
5
Ground
6
Output Pair 1 +
7
Input Pair 4 +
8
Ground
9
Input Pair 3 -
10
Input Pair 2 +
11
Ground
12
Input Pair 1 -
13
Not Used
14
Output Pair 4 -
15
Output Pair 3 +
16
Ground
17
Output Pair 2 -
18
Output Pair 1 +
19
Ground
20
Input Pair 4 -
21
Input Pair 3 +
22
Ground
23
Input Pair 2 -
24
Input Pair 1 +
25
Ground

Option Board MADI I/O, BNC
Option Board MADI I/O, BNC (O_DAP_MB_a)
Standards
Relevant specifications comply with AES10-2008 and AES11-2009
Audio
24-bit, transparent forwarding of PCM and compressed audio
Sample rate = 44.1, 48, 88.2, 96kHz (88.2, 96kHz short framing) BNC
Important - Not all sample rates are supported by the host system, please refer to the respective information.
BNC Input
65/56 channels @ 44.1 and 48kHz; 32/28 @ 88.2 and 96kHz
Impedance = 75Ohm
Input level = 0.15 ... 0.8Vpp @ 75Ohm
Cable length maximum = 150m using Belden 1694A cable
BNC Output
64/65 channels @ 44.1 and 48kHz; 32/28 @ 88.2 and 96kHz
Impedance = 75Ohm
Output voltage = 0.6Vpp (typical) @75Ohm
General Features
Input cable equalizer for extended range and robustness
Reference-grade Wordclock recover, master-sync capable
Dedicated routing for non-processed channels; all channels (max 64) can be routed to/from the device or looped through
AES3 channel status management, non-audio detection

Option Board MADI I/O, Optical
Option Board MADI I/O, Optical (O_DAP_MO_MM_a, O_DAP_MO_SM_a)
Standards
Relevant specifications comply with AES10-2008 and AES11-2009
Audio
24-bit, transparent forwarding of PCM and compressed audio
Sample rate = 44.1, 48, 88.2, 96kHz (88.2, 96kHz short framing)
Important - Not all sample rates are supported by the host system, please refer to the respective information.
Optical Input, LC
64/56 channels @ 44.1 and 48kHz; 32/28 @ 88.2 and 96kHz
Connector type = LC (IEC 61754-20)
Center wavelength = 1310nm (typical), 1270 ... 1360nm
Input optical power
O DAP MO MM a = -31 ... -8dBm, OM2 multimode (50/125um)
O DAP MO SM a = -23 ... -8dBM, singlemode (standard values, others upon request)
Cable length maximum
O DAP MO MM a = 1.5km, OM2 multimode
O DAP MO SM a = 2km, singlemode (standard values, others upon request)
BNC Output
Optical and BNC outputs carry the same signal
Impedance = 75Ohm
Output voltage = 0.6Vpp (typical) @ 75Ohm
General Features
Field-replaceable optical module (SFP)
Reference-grade Wordclock recovery, master-sync capable
Dedicated routing for non-processed channels
All channels (maximum 64) can be routed to/from the device or looped through
AES3 channel status management, non-audio detection
Parallel outputs (BNC/LC) for media conversion

flexAIserver - Overview

Physical Installation
Note - The information below applies to the pre-configured flexAIserver hardware supplied by Jünger Audio. If flexAI is installed on different server hardware, refer to the manufacturer's documentation for model-specific installation, cooling, power, and safety requirements.
The pre-configured flexAIserver is a 1RU, 19-inch rack-mount server intended for installation in a standard equipment rack.
Install the server using the appropriate rack-mounting hardware and make sure that it is adequately supported.
The server is actively cooled. Keep all ventilation openings clear and ensure sufficient airflow through the rack. Additional spacing above or below the server is normally not required unless specified by the server manufacturer or required by the cooling concept of the installation.
Power
The pre-configured flexAIserver is equipped with redundant power supplies.
Connect both power supplies for redundant operation. If one power supply fails, the remaining supply can continue to power the server.
For installations requiring high availability, connect the two power supplies to independent mains circuits whenever possible. Ideally, the circuits should also be backed by separate UPS feeds or other suitable backup power arrangements. This provides protection not only against a power supply failure, but also against the loss of one mains circuit.
Each power supply has its own mains connection and power control, depending on the installed server hardware.
Important - Please read Safety Information on proper grounding and electrical safety.

Software Installation Guide Dell
Installing flexAIserver
This guide describes two methods for installing the flexAIserver software on a supported Dell PowerEdge server:
Method A: Installation from a bootable USB drive
Method B: Remote installation using Dell iDRAC Virtual Console and Virtual Media
Both methods use the same flexAIserver installation image. Once the installer has started, the remaining installation procedure is identical.
Prerequisites
Before starting the installation, make sure the following are available:
flexAIserver ISO image. The ISO may be supplied inside a ZIP archive and must be extracted before use.
Access to the Dell PowerEdge server.
For Method A – USB, you also need:
A USB flash drive
Physical access to the server
A keyboard and, if required, a local display
For Method B – iDRAC, you need:
Access to the Dell iDRAC interface
Permission to use Virtual Console and Virtual Media
Important - Installing flexAIserver erases the selected target disk. Make sure that the correct server and target disk have been selected before continuing.
Method A – USB Drive
1. Create a Bootable USB Drive
Use a suitable image-writing tool such as balenaEtcher to write the flexAIserver ISO image to a USB flash drive:
https://www.balena.io/etcher/
Important - Writing the ISO image erases all existing data on the USB drive.
When the USB drive is ready:
Insert it into a USB port on the server.
Connect a keyboard.
Power on or restart the server.
2. Open the Boot Manager
During server startup, press F11 to open the Dell Boot Manager.
Dell PowerEdge boot screen – press F11 to open the Boot Manager.
3. Open the One-shot UEFI Boot Menu
Select One-shot UEFI Boot Menu.
Boot Manager – select One-shot UEFI Boot Menu.
4. Select the USB Drive
In the UEFI boot list, select the entry corresponding to the connected USB drive.
Select the USB installation drive. USB installation only.
Continue with Common Installation Steps below.
Method B – Dell iDRAC Virtual Media
1. Map the ISO as Virtual Media
Open the Dell iDRAC Virtual Console.
In the Virtual Console, open Virtual Media and map the flexAIserver ISO image as a virtual CD/DVD.
iDRAC – flexAIserver ISO mapped as Virtual CD/DVD. iDRAC installation only.
2. Restart the Server
From iDRAC, select Power > Reset System (warm boot) to restart the server and make the virtual installation media available during boot.
iDRAC – restart the server using Reset System (warm boot). iDRAC installation only.
3. Boot from the Virtual Optical Drive
During startup, open the Boot Manager, select One-shot UEFI Boot Menu, and then select Virtual Optical Drive.
Boot from Virtual Optical Drive. iDRAC installation only.
Continue with Common Installation Steps below.
Common Installation Steps
The following steps are identical for USB and iDRAC installations.
1. Start the Installer
In the GRUB menu, select Graphical install and press Enter.
GRUB – select Graphical install. Applies to both installation methods.
2. Set the Host Name
When prompted, enter the host name to be used by the flexAIserver.
For a Jünger Audio pre-configured system, the host name can follow the device serial number, for example:
flexAIserver-00119
Alternatively, use a suitable host name according to the naming conventions of your network environment.
Enter the host name for the flexAIserver. Applies to both installation methods.
3. Select the Target Disk
Select the internal system disk on which flexAIserver should be installed.
On Dell PowerEdge systems with a PERC RAID controller, the internal storage may appear with a name such as DELL PERC.
For USB installations, make sure that you do not select the USB installation drive.
Select the internal system disk. Do not select the USB installation drive. Applies to both installation methods.
Important - All existing data on the selected target disk will be erased during installation. Verify the selected disk carefully before continuing.
4. Complete the Installation
Allow the installer to complete the installation process.
Installation complete. Applies to both installation methods.
Before rebooting:
USB installation: Remove the USB installation drive.
iDRAC installation: Unmap or disconnect the virtual installation media.
Restart the server and allow it to boot from the newly installed system disk.
Continue with the Initial Setup procedure to complete the flexAIserver configuration.

Software Installation Guide HPE
HPE ProLiant DL360 Gen11
This guide describes the initial hardware configuration and installation of flexAIserver on the qualified HPE ProLiant DL360 Gen11 platform.
The server can be configured locally using a VGA monitor and USB keyboard or remotely using HPE iLO.
Important - This guide applies only to the HPE ProLiant DL360 Gen11 server qualified for flexAIserver. Do not apply the server-specific RAID, BIOS, or remote-management instructions to other hardware platforms.
Prerequisites
Before starting, make sure the following are available:
The flexAIserver ISO image. If supplied inside a ZIP archive, extract the ISO before use.
Two internal SSDs installed in the server for the RAID1 system volume.
For local access: a VGA monitor and USB keyboard.
For USB installation: a USB flash drive with sufficient capacity. Its existing contents will be erased.
For remote access: a network connection to the dedicated iLO port and access to the iLO credentials printed on the server top lid.
Warning - Creating the RAID volume and installing flexAIserver will erase data on the selected internal drives.
1. Initial Server Configuration
Access the Server
The server can be configured remotely through HPE iLO or locally using a monitor and keyboard.
Option A – HPE iLO Remote Access
Connect a network cable to the port labelled iLO.
For the initial connection, connect a monitor to the VGA port and power on the server.
Note the iLO IP address shown during startup.
Open the iLO IP address in a web browser.
Log in using Administrator as the user name. The initial password is printed on the server top lid.
In the iLO interface, open the Remote Console from the preview tile.
Launch the HPE iLO Remote Console from the preview tile.
Option B – Local Access
Connect a monitor to the VGA port.
Connect a USB keyboard.
Perform the following configuration steps directly on the local server console.
Open System Utilities
Power on or restart the server. During startup, press F9 to open System Utilities.
Prepare the SSDs for RAID1
Open:
System Utilities > System Configuration > HPE MR216io Gen11 > Main Menu > Configuration Management > Create Logical Drive
If the SSDs are listed as JBOD drives, select both internal SSDs and confirm the selection so that they can be used for the logical drive.
Select both internal SSDs and confirm the selection.
Create the RAID1 Logical Drive
Set Select RAID Level to RAID1.
Choose Select Drives and verify that both internal SSDs are selected. Then select Save Configuration.
Select RAID1, verify both drives, and save the configuration.
Confirm the configuration. When the logical drive has been created successfully, press Esc to return to the previous menu.
Apply the Low Latency Workload Profile
In System Utilities, open:
System Configuration > BIOS/Platform Configuration (RBSU) > Workload Profile
Select Low Latency and confirm the message.
Select the Low Latency workload profile.
Press F12 to save the configuration and exit. The server restarts.
Change the Workload Profile to Custom
During the next startup, press F9 again and open:
System Utilities > System Configuration > BIOS/Platform Configuration (RBSU) > Workload Profile
Select Custom, which is the last entry in the list, and confirm the message.
Select Custom as the workload profile.
Configure Virtualization Options
Open Virtualization Options and configure the settings as follows:
Intel(R) Virtualization Technology (Intel VT): Disabled
Intel(R) VT-d: Enabled
Access Control Service: Disabled
SR-IOV: Disabled
Enable Intel VT-d and keep the other virtualization options disabled.
Press F12 to save the configuration and exit.
2. flexAIserver Software Installation
The flexAIserver software can be installed either from a bootable USB drive or remotely through HPE iLO Virtual Media.
Once the Jünger installation menu appears, the remaining installation procedure is identical for both methods.
Method A – USB Drive
Create a Bootable USB Drive
Use a suitable image-writing tool such as balenaEtcher to write the flexAIserver ISO image to the USB drive:
https://www.balena.io/etcher/
The USB drive will be erased.
Insert the USB drive into a front USB port.
Connect a keyboard.
Power on or restart the server.
During startup, press F11 to open the Boot Menu.
Select the UEFI entry corresponding to the USB installation drive.
Press F11 during startup and select the USB installation media.
Continue with Installation Procedure – Applies to Both Methods below.
Method B – HPE iLO Virtual Media
Map the ISO as Virtual Media
Make sure the server is powered off. If it is currently running, shut it down using the iLO power controls or the physical front-panel power button.
Launch the Remote Console as described above.
In the Remote Console:
Select Virtual Media.
Select CD/DVD.
Select *Local .iso file.
Select the flexAIserver ISO image.
Open Virtual Media, select CD/DVD, and map the flexAIserver ISO image.
Boot from the Virtual Media
Keep the Remote Console open during installation. Closing it may disconnect the virtual installation media.
Power on the server using Power > Momentary Press in iLO.
Wait for the Jünger installation menu to appear.
If the server does not boot from the virtual media automatically, press F11 during startup, open the Boot Menu, and select the virtual CD/DVD or corresponding virtual-media source.
Installation Procedure – Applies to Both Methods
The following steps are identical whether the installation media is connected by USB or through HPE iLO.
Start the flexAIserver Installer
When the Jünger installation menu appears on the local display or in the Remote Console, select the available installation option, such as Graphical Install or Install, and press Enter.
Select the installation option and press Enter.
Note - The Debian version and build information shown in the following example screenshots may differ from the delivered flexAIserver ISO. The installation procedure remains the same.
Set the Hostname
When prompted, enter the hostname for the flexAIserver.
For example:
flexAIserver-00119
The final digits of the device serial number may be used, or another hostname can be chosen according to the naming convention of the network environment.
Enter the hostname for the flexAIserver.
Select the Target Disk
Select the internal RAID1 logical volume created during the initial server configuration.
Do not select the USB installation drive.
Important - The device names and capacities shown on the HPE server may differ from the generic example below. Identify the internal RAID1 logical volume by its capacity and controller information before continuing.
Select the internal RAID1 logical volume, not the USB installation drive.
Warning - All existing data on the selected target disk will be erased during installation.
Finish the Installation
When the installer reports that the installation is complete:
USB installation: Remove the USB drive before continuing.
HPE iLO installation: Unmount or disconnect the virtual CD/DVD image before continuing. Keep the Remote Console open until the reboot has completed.
Select Continue to reboot into the newly installed system.
Installation complete – remove the physical or virtual installation media before rebooting.
After the server has booted, continue with the flexAIserver Initial Setup.

Safety Information
Critical information - Please read the following safety information carefully before installing, operating, or servicing the flexAIserver hardware.
Electrical Safety
Connect the server only to mains outlets that provide a protective earth connection.
Make sure that the mains power cords remain accessible so that the server can be disconnected from mains power when required.
Servers equipped with redundant power supplies use separate mains connections for each power supply. All connected power cords must be disconnected to completely remove mains power from the server.
Use only power cords that are suitable for the server hardware and approved for use in the country or region of installation.
Do not expose the server to dripping or splashing water and do not place containers filled with liquid on or directly above the unit.
Note - The exact mains connections, power controls, and electrical specifications depend on the installed server hardware. Refer to the safety and installation documentation supplied by the server manufacturer.
Service Safety
Service work must only be carried out by suitably qualified personnel.
Before opening or servicing the server:
Shut down the operating system when possible.
Switch off the server.
Disconnect all mains power cords.
Make sure that the power cords cannot be reconnected accidentally while service work is in progress.
Do not perform internal service work while the server is connected to mains power unless the procedure is explicitly specified by the server manufacturer and is carried out by suitably qualified personnel.
Installation and Operation
Install the server in a standard 19-inch equipment rack using the rack-mounting hardware specified for the server model.
Make sure that the server is adequately supported and securely installed in the rack.
The server is actively cooled. Keep all ventilation openings clear and maintain the airflow specified by the server manufacturer.
Additional empty rack units above or below the server are normally not required unless specified by the server manufacturer or by the cooling concept of the installation.
Do not operate the server with covers, panels, or other safety components removed.
If the server, power cords, connectors, or other components appear damaged, disconnect the server from mains power and have it inspected by qualified service personnel before further use.
Internal Battery
Server hardware may contain one or more internal lithium batteries.
Warning - Internal batteries must only be replaced with the type specified by the server manufacturer. Incorrect replacement or installation may present a risk of fire or explosion. Follow the manufacturer's instructions for replacement and disposal.
Manufacturer Safety Information
The flexAIserver software may be supplied on different qualified server platforms. Hardware-specific safety instructions, rack-mounting requirements, environmental limits, servicing procedures, and regulatory information are provided by the respective server manufacturer.
Important - Always follow the safety and installation documentation supplied with the installed server hardware. Where hardware-specific instructions differ from the general information on this page, the server manufacturer's instructions take precedence.

flexAIserver - Technical Data

tieLight portal PCIe
tieLight Portal PCIe – tieLight and MADI I/O Card (O_Serv_AI_MADI_TIE_a)
The tieLight Portal PCIe card provides optical tieLight and MADI audio I/O together with an external synchronization input.
Standards
MADI interface compliant with AES10-2008
Synchronization interface compliant with AES11-2009 and the applicable audio and video synchronization standards
Audio
24-bit audio
Transparent transport of PCM and compressed audio
Supported sample rates:
44.1 kHz
48 kHz
88.2 kHz
96 kHz
88.2 kHz and 96 kHz use short-frame MADI operation
Important - Not all sample rates may be supported by the host system. Refer to the specifications of the respective flexAI system.
Optical Input
Connector: LC, according to IEC 61754-20
Audio channels:
64 / 56 channels at 44.1 and 48 kHz
32 / 28 channels at 88.2 and 96 kHz
Single-mode center wavelength:
1310 nm typical
1270 to 1360 nm
Multimode center wavelength:
1310 nm typical
1270 to 1360 nm
Optical Input Power
Optical Module
Fiber Type
Input Optical Power
O_DAP_MO_MM_a
OM2 multimode, 50/125 µm
-31 to -8 dBm
O_DAP_MO_SM_a
Single-mode
-23 to -8 dBm
Other single-mode variants may be available on request.
Maximum Cable Length
Optical Module
Fiber Type
Maximum Cable Length
O_DAP_MO_MM_a
OM2 multimode
1.5 km
O_DAP_MO_SM_a
Single-mode
2 km
The values shown for the single-mode module are the standard specifications. Other variants may be available on request.
Sync Input
The card provides a multi-standard external synchronization input supporting AES/EBU, Word Clock, Black Burst, and Tri-Level Sync.
Connector: BNC
Input impedance: 75 Ω
AES/EBU input: 0.3 to 5 Vpp, single-ended
Word Clock input: 1 to 5 Vpp, single-ended
Video sync input: 1 Vpp nominal, single-ended
Supported video frame rates:
23.975 fps
24 fps
24.975 fps
25 fps
29.97 fps
30 fps
49.95 fps
50 fps
59.94 fps
60 fps
Supports applicable SD and HD synchronization formats
The synchronization interface complies with AES11-2009 and the relevant audio and video synchronization standards.
General Features
Field-replaceable optical SFP module
Reference-grade Word Clock recovery
Master synchronization capability
Dedicated routing for channels that do not require audio processing
Audio channels can be routed to and from the host system or looped through the interface
Maximum routing capacity:
128 MADI channels
2048 tieLight channels
AES3 channel-status handling in MADI mode
Non-audio detection in MADI mode