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54 l September 2014


installation Roland Hemming


Network Display series amps. With regard to the pace of the scheme’s output to date, Kreifeldt says “the first ones are always the hardest” – but he admits that the programme has perhaps progressed more slowly than might have been hoped. “I think that anyone who works on any kind of technology [project]


to define a set of profiles for video transport via pro-video equipment utilising the IEEE 802.1 and 1722 family of AVB standards. The next stage is for the MRD to go to AVnu Alliance’s Technical Work Group (TWG), where the group will compose the certification tests based on the MRD. Certification testing for AVB- enabled professional video endpoints is not expected to commence until mid-2015. This might seem a long way off, but it’s hard not to feel sympathy for the group responsible when the current emerging requirements – chiefly the much-trumpeted and technically demanding Ultra High Definition (UHD) format – are taken into account. “We really have to ensure that the scheme is future-proof and that we are dealing with 4K and all that is coming through in the future,” says Kreifeldt.


These Crown amps are one of only a handful of products to be AVB certified


probably looks back and realises that if they had made a few turns differently, they could probably [have got there more quickly],” he says.


Kreifeldt reveals that “a number” of other products are currently in the midst of certification, although only Audio Science, Harman and Meyer Sound had given their approval to specific mentions at press time. Additionally, new member Pivitec’s CEO, Tom Knesel, tells PSNEurope that the company “plans to submit its e64i/o MADI-to-AVB bridge for certification this year”. But what of a certification programme for professional video endpoints? Well, the Alliance confirms that it has now completed the Market Requirement Document (MRD)


Riedel showed this AVB-ready unit at ISE earlier this year, but it is yet to be certified


3. SWITCHES


One of the abiding obstacles facing the project has been the need for dedicated switches to make AVB networks operate. This has appeared to threaten the scheme’s prospects in a fashion that has not confronted technologies such as Ravenna, which can operate via existing switches.


With only the aforementioned Extreme Networks’ switches having completed the certification process, industry consultant Roland Hemming’s claim that “the gear is simply not there” is not without foundation. Putting aside the issues of certification and availability, the challenge of implementing AVB- enabled switches is obviously far from negligible.


Hemming says that while “the companies within AVnu normally do great marketing”, he is “astonished at their ineptness with promoting AVB”, adding: “Even their use of language has been somewhat arrogant. AVnu talk about [replacement of] ‘legacy’ switches, when they mean every switch in the world except around 20 models. A kinder way might have been for them to talk about ‘future switches’.” Speaking on behalf of network specialist and AVnu Alliance member Arista Networks, vice president of sales, Warren Belkin, says: “Arista has brought AVB to off-the-shelf Ethernet switches with web scale economies, and it isn’t true that these are ‘expensive’ compared to non-AVB Ethernet switches. However, Hemming raises the point that even with AVB switch availability the vast majority of audio installations are refurbishments where the building switches may not be changed, preventing faster adoption of AVB anyway. Greater availability will surely push down price-points eventually – but in the meantime, it is clear that, at least, there is a ‘legacy’ perception problem that the AVnu Alliance would do well to address.


4. LAYERS


Inextricably interlinked with the switch issue is the topic of utilising existing network infrastructures and increased convergence with IT. One of the ways in which Audinate’s Dante media networking technology has benefited, says CEO Lee Ellison, is in its ability to operate over existing networks. “The challenge is to make sure that existing products will work together without the need to put in separate networks. The convergence with IT can only occur if you are leveraging that infrastructure,” he says. Dante’s case to market has been further strengthened in recent months by the introduction of Dante HC – which supports up to 512 x 512 redundant bidirectional uncompressed audio channels on


Xavtel recently became an AVnu Alliance member


a single Xilinx FPGA – and the Dante Via software application. The ability of Ravenna, too, to operate via existing switches has served it well in a competitive marketplace. Meanwhile, the arrival of AES67 – which both Dante and Ravenna will support – gives standards reinforcement to Layer 3 RTP transport. In time, AES67’s ‘case’ may be further boosted by the introduction of the network control-oriented AES-X210, which is likely to be published in late 2014.


“Enquiries about AVB?” says Ellison, who notes that Audinate remains an active member of the AVnu Alliance. “Well, there was a lot of interest four years ago, but it has gradually fallen away, particularly over the past 18 months. By contrast, there has been a rise in enquiries regarding AES67.”


The question inevitably arises, then, of whether a Layer 3 version of AVB is needed to complement its existing, Layer 2-centric incarnation. Hemming notes: “Layer 3 is important, but it has also become a buzzword which has perhaps unfairly hindered AVB against its competition. Not that many projects actually need Layer 3, but it’s become something that seems important and AVB doesn’t currently offer that comfort. Like it or not a Layer 3 version of AVB is needed.”


5. PERCEPTION Whatever the strength of the AVB case, anonymous opinion related to PSNEurope in preparation for this article confirms that many end-users remain uncertain about its advantages or the extent to which it will eventually become a day-to-day working reality. For sure, the AVnu Alliance has maintained a presence at many of the leading trade shows – although it is not exhibiting in its own right at IBC this month – and there has been a steady flow of op-ed-style pieces about the project’s objectives. But the opinion voiced by Hemming – that there hasn’t been a properly open debate about the role of AVB – is hardly an isolated one. “Their message was ‘AVB is coming, get used to it,’ not ‘what do you think?’, ‘how would you like us to use it’ or ‘what is important to you?’” he says. “I was the first to go public with the


belief that AVB may not work out for pro audio. A leading AVnu company replied that ‘my opinion was against the views of 50 major companies’ – that’s really not much of a debate.”


WHERE NEXT?


Hemming’s viewpoint on the prospects for AVB – that it will retain a part of networking future, but possibly in a fairly niche capacity – is underlined by his own 2013 research revealing that “even when counting generously AVB was 5% of all available networked products. And I am confident that will have declined further by the time we complete same research this year.”


With a few protocols now being AES67 compliant and more expected to be in the next few months, it is possible to see the industry drifting further away from AVB. And yet, and yet… it is clear that the Alliance retains an admirably ambitious vision for the future of AVB. For one, broadcast is more firmly in the Alliance’s sights than ever before (does this bring AVB more firmly into competition with Ravenna? “I guess so,” admits Kreifeldt); to this effect, Jan Eveleens, CEO of Axon Digital, presented a two-hour session on AVB for Broadcast at the European Broadcast Union Network Technology Seminar in June. Meanwhile, in automotive, there are a number of ongoing schemes relating to AVB deployment via infotainment and driver assistance cameras – projects that, at the very least, promise to bring the technology to a broad consumer audience. The sheer number of companies behind AVB and the considerable investment already made in related products strongly suggest that the project will not come to an ignominious conclusion. But as this article has demonstrated, direct and specific questions persist that must be addressed clearly, comprehensively – and above all, publicly – if AVB is to achieve the kind of mainstream success originally envisaged.  www.alcnetworx.de www.audinate.com www.avnu.org


www.harmanpro.com www.pivitec.com


rhconsulting.eu/blog/files/ EveryNetworkedProduct.html www.xavtel.com


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