RESONETZ LINK PROTOCOL

RESONETZ TECHNOLOGY

IP NETWORKS. EVERYWHERE.

It’s common sense allover the media industry: the modern way of communication and it’s worldwide realtime broadcast and collaboration processes need to rely on the existing and rapidly growing networks. From the near future, any kind of media transmission will be based on packet-based networks. The bandwidth of IP-based networks has increased dramatically in recent years and is still growing at an incredible speed, enabling connections to handle large data capacity at high speed by using affordable standard hardware (off-the-shelf switches and routers). 5G mobile communication with 1 GBit speed and down to 1 ms latency is around the corner. The time for a consequent exploitation of the emerging network technology is now.

For PA engineers, radio and TV broadcasters, sound studios and media installations it’s a groundbreaking opportunity to use IP media routing infrastructures. Network systems provide more flexible and less costly media transmissions, than the traditional point-to-point based technologies, like MADI or AES/EBU. Countless small IP packets can transport any data in local networks, in the internet and even over the growing mobile telecommunication networks. Packets can even travel to several destinations at the same time (Multi-cast).

As always in human history, even a revolutionary new technology has to struggle with early limits and rivals trusted solutions, like ISDN or countless grown digital pro audio installations.

Although by definition, IP packets can traverse any network, most Audio-over-IP protocols are not designed to provide reliable communication besides defined and strictly managed local networks. Limited bandwidth, synchronization problems and shared traffic result very often in significant delays and packet losses.

The RESONETZ LINK protocol delivers a solution to deal with these imperfect networks. In using the upper Layer network protocols it provides priority operation in shared traffic IP network environments. Unique transmission algorithms ensure a reliable end-to-end transport with an advanced synchronization technology - even in highly heterogeneous networks. It minimizes the risks of packet losses, avoids audio degradation and delivers a perfectly reconstructed source signal to the distant receiver.

This way RESONETZ LINK products are groundbreaking universal Audio-over-IP solutions, which can transmit uncompressed, multichannel audio not only via the biggest and fastest growing network structure on earth: the global internet, but also on LAN, dedicated Fiber-to-the-Home lines ("Dark Fiber") and high-speed telecommunication networks, like NTT’s IP-based communication network ("HIKARI DENWA").

IP is like Pac-Man. Eventually, it will eat everything in it’s way.

H. Esslambolchi
President AT&T Labs

RESONETZ LINK

LOSSLESS. MULTI-CHANNEL. UNIVERSAL IP.

Network
Universal Network
MULTI-CHANNEL AUDIO WITH ANY IP NETWORK

RESONETZ LINK provides multi-channel, low latency transmission in local and wide area networks, including Fiber-to-the-Home (“Dark Fiber”) and the public internet. Solutions for NTT´s IP-based communication network ("HIKARI DENWA") as perfect replacement for ISDN connections are available.

Audio
LOSSLESS HIGH RESOLUTION AUDIO

RESONETZ products provide bit-transparent high-resolution audio with up to 24 Bit and 192 kHz. No psycho-acoustic compression like in MP3 format take place. CODEC compression is optional.

RELIABLE REALTIME TRANSMISSIONS
RELIABLE REALTIME TRANSMISSIONS

RESONETZ LINK provides broadcast-reliable transmissions with low latency in various networks. Thanks to the patented sample synchronization and realtime network monitoring algorithms, RESONETZ products deliver a superior performance even in shared networks with high transmission jitter.

SEAMLESS INTEGRATION TO PRO AUDIO
SEAMLESS INTEGRATION WITH PRO-AUDIO FORMATS

RESONETZ interfaces bridges bi-directional to the industries digital multichannel standards: MADI or AES/EBU. This way RESONETZ provides the gateway for countless pro audio setups to the 21st century´s network audio distribution.

The EtherMADI-64 realizes all pro-audio advantages of the MADI format in the world of Audio-over-IP:

Multi-Channel. High quality. High Reliability.

RESONETZ LINK

PROTOCOL FEATURES

IP UDP/RTP

PACKETS

512 Ch.

Bi-directional (GBit LAN)

192 kHz

SAMPLE RATE (up to)

YES

REDUNDANT LINK

< 500 μs

NODE-TO-NODE LATENCY (LAN)

RESONETZ

SYNC TECHNOLOGY WAN
WITH SAMPLE ACCURACY

PTPv2

SYNC TECHNOLOGY LAN
WITH PHASE ACCURACY

Patents: 2013-203074(JP), 14/138781(US), 14152425.6(EU)

RESONETZ LINK

THE LOW LATENCY IP SOLUTION.

NETWORK BANDWIDTH AND LATENCY

Bandwidth and latency of a network define the speed and the ability to process (audio) data in realtime and provide the essential timing and synchronisation. The bandwidth defines the amount of data that passes through a connection over a given time (bits per second - bps). For the best performance a Gigabit network or better is recommended.

The network latency is the amount of time it takes for a packet to travel from source to destination - for AoIP the time from an audio node to another audio node. With a time below 500 microseconds for node-to-node (digital-to-digital) packet transmission in a typical in-house LAN and less than 40 ms for WAN transfer, the RESONETZ LINK latency amounts only a fraction of a second and marks the edge of the technologically possible.

LOW LATENCY vs. BANDWIDTH EFFICIENCY

For a low latency the packet size has to be small, which means a smaller audio payload in each packet (down to 3 samples!). Therefore much more packets are needed to send the equivalent amount of audio through the network.

IP networks are not the perfect partner for realtime audio. They transmit audio packets like any other packets. Switches and routers read the adresses on the “envelopes” and deliver them to their destinations. In contrast to the usual traffic with occasional transfer peaks, even a few uncompressed audio channels create a continuous, hardware-exhausting stream of incredible small packets.

NUMBER OF IP PACKETS: Audio-over-IP (red) vs. Office PCs (white):

Packet Streams compared

RESONETZ REALTIME NETWORK ADAPTATION

The huge amount of data and protocol overhead in the packet stream (more “envelopes”) results in a lower bandwidth efficiency. Depending on the present condition of the network - size and utilization - an increase of low-latency traffic can lead to congestion and traffic load balancing. Packets could be delivered out of order, delayed, duplicated or even get lost.

The ratio between payload size, latency and network efficiency is a complex system of mutual dependence. Finding the best compromise between these factors is a key feature for every Audio-over-IP protocol.

As there could be never a perfect solution with fixed values, RESONETZ provides an innovative way of seamlessly adaptation to the network data processing capabilities.

Thanks to the constant realtime measuring of the network parameters, RESONETZ devices find the best solution for the lowest latency and the best network efficiency by creating packets with a latency-optimized size, based on the up-to-date condition of the network - measured in realtime.

Realtime Network Adaption

LATENCY COMPARISON: AUDIO-OVER-IP vs. PCI, USB AND SONIC WAVES

SHOW COMPARISON

READ ON: RESONETZ LINK. NETWORK LAYERS.