With SCTE Cable-Tec Expo less than a week away, the time is right for a review of how distributed access architectures (DAA) have advanced in the last year. There are several reasons this is so important. First, there's consensus in the industry that the move to distributed architectures is part of a once-in-a-lifetime, generational shift in the cable access network. Second, the new technology is bringing with it new competitors to the cable market. And third, the way the DAA revolution plays out will have a significant impact on how broadband is delivered in the future, part of a trend toward far greater network virtualization, automation and the drive to move many resources closer to the network edge.
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So what's happened in a year? Quite a bit, but that doesn't mean there aren't still kinks to be worked out. On the one hand, is already up to its eighth version of the Remote PHY specification, which is one of the main ways DAA will be implemented. Rkit-arm Serial Key. CableLabs has also just launched a qualification program for testing Remote PHY devices. That means the spec is reaching a critical state of maturity, enabling operators to consider deploying Remote PHY technology at scale. On the other hand, 2017 hasn't turned into a year of DAA deployments. If anything, cable operators are moving forward a little more slowly than expected, taking their time to ensure that all of the pieces fit together and that new technologies cooperate with existing back-office systems.
There have been early trials this year, but vendors agree that 2018 will actually be the year that commercial deployments take off. The advantages of DAA include digitizing the link between headend/hub and the cable node to improve signal quality and network management capabilities, as well as reducing the number of specialized hardware chassis (CMTS or CCAP) needed in cable headends and hub sites as bandwidth demands continue to grow.
Cable operators won't roll out DAA upgrades everywhere at once, but many will deploy Remote PHY or Remote MAC/PHY devices as they split nodes to decrease the number of subscribers in different service groups. Many operators will also do it when there's an opportunity to get rid of a hub site altogether in favor of deploying more, and more intelligent, nodes. CableLabs diagram of a high-level Remote PHY architecture Deployments won't necessarily be easy.
One of the biggest challenges with DAA technology today is interoperability. Vendors universally express their support for new optical nodes that are interoperable with CCAP cores from a variety of other manufacturers, and vice versa.
However, interoperability is still largely an aspiration today. CableLabs said in just last week that 'interoperable Remote PHY devices (RPDs) now exist and will be available on the market soon.' Yet nearly every single DAA vendor that Light Reading has spoken with has been much more cautious in their assessment of the current interoperability situation.