The Joker for Audio-over-IP networks: AES67 and Ravenna Protocol, Redundancy and Configurability down to 2-Channel StreamsJT NM 1

With the RIF67 card it is possible to connect up to eight AoIP networks to a NEXUS system. AES67 and Ravenna are supported. The RIF67 cards are available in four versions: with 2, 4, 6 or 8 active ports. A total of 256 audio channels can be output in IP streams. Depending on the expansion level of the board, 8 channels (RIF67-1) down to 2 channels (RIF67-4) can be bundled per stream.

The RIF67 card for the NEXUS Star Router is the most powerful solution for connecting AoIP networks to the NEXUS system. To ensure maximum compliance with AoIP standards and to be able to quickly accommodate future extensions, the RIF67 card uses the AES67.IO modules from DirectOut as "piggyback" modules. Up to four of these modules can be equipped on one board, whereby each equipped module activates two RIF45 ports of the RIF67 board. 256 input and 256 output channels can be exchanged simultaneously with the matrix of the Star Router via one RIF67 board. When equipped with an AES67.IO module, these can be distributed over up to 32 IP streams. Each additional module adds 32 additional streams.

The same connection also applies on the input side. Stage Tec's adaptation of the DirectOut modules thus provides excellent, easy-to-use integration with the NEXUS network, cleverly expanding the available options and deliberately dispensing with complicated special solutions. With a fully-equipped RIF67 card it is possible to create 128 stereo IP streams from the sum of 256 audio channels, which can be a great advantage especially in large AoIP networks, e.g. in broadcasting applications. For sample-accurate synchronization, the RIF67 card offers synchronization in both directions, as is typical for NEXUS cards. With its highly stable internal clock generator, the NEXUS system can be configured as a PTPv2 master for the connected AoIP networks. Conversely, it is of course possible to follow the PTP Grandmaster of one of the connected networks.

Optional Equipment with Additional AES67.IO Modules for 4 Separate Networks

The module can be equipped with one to four AES67.IO modules, each feeding two Ethernet ports. Therefore, four separate, redundant networks can be used when fully equipped.

Redundancy According to SMPTE 2022-7 (Seamless Protection Switching)

The uninterruptible switching described in the SMPTE 2022-7 standard can be configured for safe transmission of the audio streams.

Adjustable Digital Gain at Inputs

A digital gain is available on all inputs.


Integration of the Star Router in an IP-Based Network

The module connects the NEXUS system to IP networks and allows the safe and accurate operation of Stage Tec systems to be combined with the flexible workflow of IP technology. Using the open standard AES67, the NEXUS audio system can be integrated into a wide variety of AoIP networks to enable flexible exchange of audio channels with devices from various manufacturers. For this purpose, a multitude of streams can be configured in detail, which allow the RIF67 card to both send and receive up to 256 channels.

Technical Specifications :


RIF67 1 x 4TE
RJ45 8x IP bidirectional

Technical Specifications

Data Formats

  AES67, Ravenna


  Each RIF67 can be equipped with 1 - 4 AES67.IO modules


  256 channels in and 256 channels out are available on the NEXUS side
  Each AES67.IO module can use all 256 NEXUS channels
  Streams with up to 256 channels are supported

Stream Transmission

Per AES67.IO module Up to 32 streams bidirectional
RIF67 each (with 4 modules) Up to 128 streams bidirectional
  Unicast/Multicast support
Connection Protocols SIP (unicast), RTSP (multicast), SAP (multicast), manual multicast stream configuration
Discovery Bonjour for Device Dicovery
Stream Delay (Offset) 8 - 8192 samples

Sample Rates

  NEXUS 44.1 kHz; 48 kHz; 88.2 kHz; 96 kHz

Audio Data

AES67.IO Module L16 (16 Bit), L24 (24 Bit), L32 (raw 32 Bit, non-standard for bit transparent transmission), AM824
NEXUS 24 bits

Ethernet Interface

Connector Up to 4x 2 RJ45 1000 BASE-T, Pri+Sec per DirectOut module
Data rate 1.000 Mbit
IP address DHCP, Zeroconf or manual configuration
IGMP v1, v2, v3
MTU 1500 (no jumbo frames)

Audio Clocking

PTP PTPv2 (IEEE1588) with IP4 and multicast
PTP Sync Intervals 31.25 ms; 62.5 ms; 125 ms; 250 ms; 500 ms; 1 s; 2 s; 4 s; 8 s; 16 s
PTP delay mechanism E2E, P2P
PTP profiles Media Profile according to AES67-2015
PTP Clock Modes Slave: NEXUS is synchronized to the PTP clock of the network grandmaster; the sensitivity of the internal clock source can be configured. With PTPv2 compatible network switches, clock quality according to AES11 can be achieved
PTP Clock Modes Grandmaster: the internal clock can serve as a clock source for the network

Operation Conditions

Temperature range 0° C to +50° C
Max. humidity max. 90 %, non-condensing

Storage Conditions

Temperature range –35° C to +70° C
Max. humidity max. 90 %, non-condensing

Power Supply

Voltage +4,75...5,25 V
Currrent max. 1,3 A (1 module)
3,5 A (4 modules)

Mechanical Data

Weight 0,54 kg
Downloads :

NEXUS / NEXUS Star Technical Specifications




RIF67 Technical Specifications