Kabel Deutschland, Germany's largest cable provider, claims to havebroken Internet speed records yesterday. While besting existingnetwork throughput records seems to be a frequent occurrence, KabelDeutschland's 4.7Gbps demonstration utilized standards, technologyand infrastructure that already commonly exist. Arris, the manufacturer of modems used by Kabel Deutschland, wasproud to announce the cable provider's achievement in this press release . "This demonstrates that today's HFC plant has the capacity todeliver a full IP video load, and that the entire HFC plant can beconverted into one or more enormous pipes to meet future consumerbandwidth demands, using current technology and networks,"noted Tom Cloonan, ARRIS CTO, Network Solutions. "Wecongratulate Kabel Deutschland on pushing through existing barriersto deliver their customers the services of tomorrow, today." Source: Arris press release ( ir.arrisi.com ) The enviable speed was achieved at a school in Schwerin, Germanywith a local infrastructure comprised of both optical fiber andcoaxial cable. |
Although the facility relies mostly on coaxialcable, it is worth mentioning the school's HFC (hybrid fiber-coax)plant had recently been upgraded to 862MHz, the standard cut-offpoint for high-end coax. To reach 4.7Gbps, Kabel Deutschland bonded twelve DOCSIS 3.0 ArrisTouchstone CM820 cable modems together. Network bonding is a methodof combining multiple network links into a single, logical link.Each modem would aggregate eight data channels at 8MHz per channeladding up to potentially 768MHz of channel bandwidth, a figure veryclose to the network's physical limits. As an aside, unlike Europe's DOCSIS (or "EuroDOCSIS")which operates with 8MHz channels, DOCSIS in the U.S. utilizes 6MHzchannels due to differences between PAL and ATSC standards.Narrower channels means less bandwidth per stream, so it isinteresting to note that the same demonstration would have likelybeen more difficult and costly in the U.S.
if utilizing the sametechnologies. Kabel Deutschland's CTO, Lorenz Glatz, offered some perspective onwhat 4.7Gbps means to everyday web surfers. Using this technology, a feature length movie could theoreticallybe downloaded in 8 seconds – at speeds faster than a standardlaptop or modem can even process – demonstrating that today'sbroadband cable network is already a high performance andsustainable infrastructure offering huge untapped potential.
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