Focusrite RedNet A8R/A16R User Guide

Introduction

This user guide applies to both the RedNet A8R and RedNet A16R analogue interfaces, providing information on installation and usage, and how to connect them into your system. Information relating to the RedNet A8R is also applicable to the RedNet A16R, with differences noted in square brackets (e.g., "8 [16] channels"). A RedNet System User Guide is also available from the Focusrite website for a detailed explanation of the RedNet system concept.

The RedNet A8R/A16R is a 1U 19-inch rack-mount interface featuring 8 [16] channels of A-D/D-A conversion plus one AES/EBU channel-pair for the Dante audio-over-IP network. It is designed for road, live-sound, and broadcast environments, offering network and power redundancy, rugged construction with latching connectors, remote control, and remote monitoring.

Dual Ethernet connectors (primary and secondary) on the rear panel ensure network reliability with seamless switchover to a standby network in case of failure. These ports can also be used for daisy-chaining units in Switched mode.

Redundant power supplies (PSU A and B) with separate input sockets allow one supply to be connected to an uninterruptible source. PSU status can be monitored remotely or from the front panel.

The unit includes a Sample Rate Converter (SRC) on the AES/EBU input pair for operation with any AES/EBU source, regardless of the Dante network's sample rate or clocking. Audio interface is provided by two [four] standard 8-way (AES59) DB-25 connections. Channels 9-10 [17-18*] function as the AES/EBU channels. (*Note: At quad sample rates, channels 17-18 are unavailable, allowing selection between 1-16 analogue or 1-14 analogue and 15-16 AES/EBU.)

Word Clock I/O on BNC connectors allows synchronization with house clock or external equipment. DARS reference can be accepted via the XLR input connector. The front panel features LEDs for PSU status, network status, sample rate, clock sources, AES/EBU signal presence, and analogue signal metering.

Installation Guide

RedNet A8R/A16R Connections and Features

Front Panels

The front panels of the RedNet A8R and A16R feature several indicators and controls:

• 1. AC Power Switch: The main power switch.
• 2. Power Indicators: PSU A and PSU B LEDs illuminate when AC input is applied and DC outputs are present. PSU A is the default supply when both are functioning.
• 3. RedNet Network Status Indicators:
  • PRIMARY: Illuminates for network connection and activity on the primary Ethernet port.
  • SECONDARY: Illuminates for network connection on the secondary Ethernet port (used in Redundant mode).
  • LOCKED: Illuminates for a valid sync signal from the network or when the unit is the Network Master. Flashes if an external clock is selected but not connected.
• 4. RedNet Sample Rate Indicators: Five orange LEDs indicate sample rate (44.1 kHz, 48 kHz, x2, x4) and Pull Up/Down status.
• 5. Signal Level Indicators:
  • INPUTS: Tri-colour LEDs (Green: Signal present at -42 dBFS; Orange: -6 dBFS; Red: 0 dBFS) indicate audio signal levels at the inputs.
  • OUTPUTS: Tri-colour LEDs (Green: Signal present at -42 dBFS; Orange: -6 dBFS; Red: 0 dBFS) indicate audio signal levels at the outputs. For the RedNet A16R at quad sample rates, LEDs 15 and 16's indication depends on the selected signal mode (Analogue or AES/EBU).
• 6. AES/EBU Signal Presence Indicators: Green LEDs indicate AES/EBU signal presence on input and output (illuminates at -126 dBFS). For RedNet A16R at quad sample rates, these LEDs are off if Analogue mode is selected.
• 7. RedNet Clock Source Indicators: Three orange LEDs indicate the selected clock source: Internal, Word Clock (BNC input), or DARS (XLR input). The 'Locked' indicator flashes if the unit reverts to its internal clock due to an invalid external source.

Rear Panels

The rear panels provide connectivity for power, networking, and audio:

• 1. IEC Mains Inlet A: Standard IEC receptacle for AC mains connection (100-240V). Requires plug retaining clips for initial use.
• 2. IEC Mains Inlet B: Input for backup mains power. PSU B takes over if PSU A fails. Recommended for uninterruptible power supply (UPS).
• 3. Primary Network Port: Latching etherCON connector for Dante network connection via Cat 5e or Cat 6 cable. Adjacent LEDs indicate network connection and activity.
• 4. Secondary Network Port: For secondary Dante network connection (Redundant mode) or an additional port in Switched mode.
• 5. Word Clock Out: Provides system clock reference output (base rate or network rate).
• 6. Word Clock In: Allows synchronization to house word clock.
• 7. AES/EBU Out: Permanent AES/EBU output for channel pair 9-10 [17-18*]. (*Note: For RedNet A16R at quad rates, this duplicates network channels 15-16 and is available in AES/EBU or Analogue mode.)
• 8. AES/EBU In: AES/EBU source for channels 9-10 [17-18*]. Can also serve as a clock source via AES/EBU or DARS. (*Note: For RedNet A16R at quad rates, this replaces analogue channels 15-16 in AES/EBU mode.)
• 9. DB-25 Connectors: Two [four] DB-25 female connectors providing analogue inputs and outputs, eight channels per connector, wired to the AES59 (Tascam) standard.

Note: Refer to the Appendix for connector pinouts.

Power Connection

IEC power cord retaining clips are supplied to prevent accidental disconnection. These clips attach to the power input sockets on the rear panel. Ensure correct orientation for effectiveness.

Physical Characteristics

The RedNet A8R/A16R requires 1U of vertical rack space and at least 350 mm of rack depth. Dimensions are approximately 455.0 mm (18.3") wide, 44.5 mm (1.75") high, and 308 mm (12.13") deep. The unit weighs 4.52 [4.78] kg. Cooling is provided by low-speed, low-noise fans. Ventilation occurs through side slots; avoid mounting directly above heat-generating equipment or obstructing the vents.

Power Requirements

The units are mains-powered with universal power supplies (100-240V AC). AC connections are via 3-pin IEC connectors. PSU A is the default supply. If a backup mains supply (UPS) is available, connect it to input B. Mating IEC cables are supplied. Power consumption is 24 [41] W. There are no user-replaceable fuses; servicing should be directed to Focusrite Customer Support.

RedNet A8R/A16R Operation

First Use and Firmware Updates

Upon initial installation, the RedNet A8R/A16R may require a firmware update, managed automatically by the RedNet Control application. It is crucial not to interrupt the update process. Focusrite periodically releases firmware updates with new versions of RedNet Control; keeping units updated is recommended.

Digital Clocking

The unit automatically locks to a valid Network Master via its Dante connection. If no Network Master is present, the unit can be designated as the Network Master.

Pull Up and Pull Down Operation

The RedNet A8R/A16R supports specified pull up or pull down percentages, configurable via the Dante Controller application.

Sample Rate Converters

The Sample Rate Converter (SRC) should be enabled if the AES/EBU source is not synchronized to the current system clock. Engaging the SRC increases device latency.

Other RedNet System Components

The RedNet hardware range includes various I/O interfaces and PCIe/PCIeR digital audio interface cards. All I/O units are mains-powered, 19" rackmount housings. Software components include RedNet Control, Dante Controller, and Dante Virtual Soundcard.

Using RedNet Control

RedNet Control displays the status of connected RedNet units. It shows PSU status (A & B), network connections (Primary, Secondary, Locked), Network Master status, and External Clock status (Green for locked, Amber for selected but not locked, Red for selected but not connected). Signal metering for each input and output channel uses three-state LEDs (Green > -42 dBFS, Orange > -6 dBFS, Red > 0 dBFS). An "-SRC-" indicator shows when sample rate converters are active for the AES/EBU channel pair.

ID (Identification)

Clicking the ID icon ? will flash the unit's front panel LEDs to identify it.

Tools Menu

The Tools icon ⚙️ provides access to system settings:

• Line Level Setup: Sets analogue line output level at 0 dBFS (+18dBu or +24dBu factory default).
• Inputs 15 & 16 from XLR (RedNet A16R only): When selected (at quad sample rates), analogue channels 15 and 16 are replaced by the AES/EBU channel pair.
• Preferred Master: On/Off state.
• RedNet Clock Source: Selectable options include Internal, Word Clock Input (BNC), or XLR Input (DARS). Selecting any source makes the unit a preferred master.
• Word Clock Input Termination: Toggle On/Off to terminate the Word Clock input BNC with 75Ω.
• Word Clock Output: Selectable between Network or Network (Base Rate).
• AES/EBU Input SRC: On/Off state, applicable to channels 9 & 10 [17 & 18], enabling Sample Rate Converters.

Appendix

Connector Pinouts

Ethernet Connector

Type: RJ-45 receptacle. Applies to: Ethernet (Dante). Wiring (Cat 6 Core): 1-White+Orange, 2-Orange, 3-White+Green, 4-Blue, 5-White+Blue, 6-Green, 7-White+Brown, 8-Brown.

DB-25 (AES59) Connector

Type: DB-25 receptacle. Applies to: Analogue I/O. Screw binding-posts use the standard UNC 4/40 thread. Pinout details for channels 1-8 and ground are provided, mapping to signals like Channel 8 (+/-), Ground, Channel 7 (+/-), etc.

XLR Connectors

Type: XLR-3 receptacle. Applies to: AES/EBU-DARS Input. Pinout: 1-Screen, 2-Hot (+ve), 3-Cold (-ve).

Type: XLR-3 plug. Applies to: AES/EBU Output.

Performance and Specifications

Focusrite RedNet Warranty and Service

Focusrite products are built to high standards for reliable performance. For warranty service, contact Focusrite support first to avoid unnecessary inconvenience. Manufacturing defects identified within 12 months of purchase will result in repair or replacement free of charge. A manufacturing defect is defined by Focusrite's published product performance, excluding damage from transportation, storage, handling, or misuse.

Warranty obligations are fulfilled by the distributor responsible for the country of purchase. Proof of purchase (invoice or receipt) is required. Purchasing outside your country of residence may limit warranty coverage, though out-of-warranty repairs may be available.

This limited warranty applies to products purchased from an Authorised Focusrite Reseller and is in addition to statutory rights.

Registering Your Product

Information on registering your product is available.

Customer Support and Unit Servicing

Details for customer support and unit servicing are provided.

Troubleshooting

Guidance for troubleshooting common issues is available.