AT&T Deploys Bonded VDSL
Posted by Jesse Ward on Monday, July 19, 2010 · 
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In an attempt to extend the reach of its U-Verse services, AT&T has begun deploying pair-bonded very high bit-rate DSL (VDSL) in the last-mile, copper portion of its fiber-to-the-node (FTTN) network.
The technology — which bonds two copper wires together – extends the network’s reach an additional 1,000-2,000 feet in a neighborhood. The variety of DSL that AT&T is using, VDSL, has a useful range of around 3,000 feet from the video-ready access devices (VRADs) that are the fiber-fed nodes in the U-verse network.
AT&T initially announced its intention to deploy pair-bonding back in 2007, but was faced with unexpected delays along the way, including modem chipset issues. The technology was supposed to help AT&T compete head-on with the broadband speeds offered by DOSCIS 3.0 cable systems. However, AT&T now reports that pair bonding won’t increase the bandwidth the telco can deliver over the network. Instead, the telco plans to use the technology to enhance its reach, offering video to more subscribers.