Upstream v. Downstream: Managing Bandwidth Efficiently
During The Cable Show last week, one of my favorite panels was a discussion that industry analyst Leslie Ellis had with Chief Technology Officers from cable companies. These are, after all, the folks who actually have to implement technology over cable plant.
This year’s panel was called “Road Trip: Mapping Cable’s New-Tech Progression,” and it provided a useful view of forthcoming technology initiatives. One of the themes was about managing the bandwidth of the cable plant.
Hearing this discussion reminded me of a common complaint about cable’s broadband service: the asymmetric nature of the connection, with a higher downstream than upstream. Some ask why broadband is typically structured in such fashion. Some suggest that other countries’ broadband is better because it’s symmetric.
I recall a notorious (to me) 2007 post from David Weinberger:
I pointed out that the “10 megs down, one meg up” mentioned by one of the panelists assumes that we’re “consumers” rather than creators; we should have symmetric up and down.
So, I asked the panelists what they thought about this notion that symmetric bandwidth is the Holy Grail of connectivity.
Tony Werner, EVP & CTO of Comcast, said, “We’ve seen a lot more growth in our downstream than in our upstream in our last 12 to 24 months. But there is continual growth, both up and down and I think you’ll continue to see us increase both of them.” He noted that cable has a “tremendous capability to blast the upstream more [than DSL], as well as the downstream, if there’s a market for it.”
Mike LaJoie, Executive Vice President & CTO of Time Warner Cable, agreed about market demand: “The ways that we build networks and provision services are responsive to how customers use it. I have some customers that do need symmetric bandwidth. I have customers on the business side who need more downstream than upstream, more upstream than down. I have products available for any of those things.” But, he said, “Most residential customers are skewed about 3 to 1, down to up. It came a little closer to symmetrical a couple of years back, but now it’s scaling back the other way. Whatever customers want, we build.”
Dermot O’Carroll, Senior Vice President of Access Networks for Canada’s Rogers Cable, pointed out that forecasts of Internet traffic say that in the next year or two, 90% of that traffic will be video. With video, the vast majority of that traffic is downstream. O’Carroll also said that this is the trend of their customers’ usage: “We’ve looked at the asymmetry of our traffic and, over the last number of years, it’s become more asymmetric, not less.”
All of this goes to show that one of cable’s strengths is that we have very flexible resources that can be reconfigured to meet our customers’ needs. Our broadband offerings will continue to change over time, in response to the desires of the marketplace.