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Comparison of audio network protocols

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Audio network technology matrix[1]
Technology Transport Transmission scheme Mixed use networking Control communications Topology Fault tolerance Distance Diameter Network capacity Latency Maximum available sampling rate
AES47[1][2] ATM Isochronous Coexists with ATM Any IP or ATM protocol Mesh Provided by ATM Cat5=100m, MM=2km, SM=70km Unlimited Unlimited 125 μs per hop 192 kHz
AES50[3] Ethernet physical layer[a] isochronous or synchronous dedicated Cat5 5 Mbps Ethernet Point-to-point FEC, redundant link Cat5=100m Unlimited 48 channels 63 μs 384 kHz and DSD
AudioRail[4] Ethernet physical layer Synchronous Cat5 or fiber Proprietary Daisy chain None Cat5=100m, MM=2km, SM=70km Unlimited 32 channels 4.5 μs + 0.25μs per hop 48 kHz (32 ch), 96 kHz (16 ch)
Aviom Pro64[5] Ethernet physical layer synchronous Dedicated Cat5 and fiber Proprietary Daisychain (bidirectional) Redundant links Cat5e=120m, MM=2km, SM=70km 9520 km[b] 64 channels 322 μs + 1.34 μs per hop 208 kHz[c]
CobraNet[6] Ethernet data-link layer Isochronous coexists with Ethernet Ethernet, SNMP, MIDI Spanning tree provided by 802.1[d] Cat5=100m, MM=2km, SM=70km 7 hops, 10 km[e] Unlimited 1.33 and 5.33 ms 96 kHz

Notes

  1. ^ Ethernet transport is combined with a proprietary audio clock transport. AES50 and HyperMAC are point-to-point audio connections, but they bridge a limited bandwidth of regular Ethernet for the purpose of control communications. An AES50/HyperMAC router contains a crosspoint matrix (or similar) for audio routing, and an Ethernet switch for control routing. The system topology may therefore follow any valid Ethernet topology, but the audio routers need a priori knowledge of the topology. While there are no limits to the number of AES50 routing devices that can be interconnected, each hop adds another link’s worth of latency, and each router device needs to be controlled individually.
  2. ^ The network diameter figure is the largest conceivable network using fiber and 138 Pro64 merger units; derived from maximum allowed response time between control master and furthest slave device.
  3. ^ Pro64 supports a wide variation range from the nominal sample rate values (e.g., 158.8 kHz - 208 kHz).
  4. ^ Network redundancy is provided by 802.1 Ethernet: STP, Link aggregation; redundant network connections (DualLink) and redundant devices (BuddyLink) are supported.
  5. ^ Indicated diameter is for 5.33 ms latency mode. CobraNet has more stringent design rules for its lower latency modes. Requirements are documented in terms of maximum delay and delay variation. A downloadable CAD tool can be used to validate a network design for a given operating mode.

References

  1. ^ "Best Practices in Network Audio" (PDF). Audio Engineering Society. 2009. Retrieved 2014-11-13. {{cite journal}}: Cite journal requires |journal= (help)
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