Looking beyond DSL speed hype

Deflating 700-900 Mbps DSL Hype [Broadband Reports]

Some phone companies' hardware vendors have boasted recently about being able to achieve broadband speeds of over 700 Mbps over DSL in a laboratory. But while it might be possible to make several sets of twisted pair copper wires transmit speeds at that level over very, very short distances in a lab, there's no way current phone company infrastructure can get anywhere close to those speeds.

I've written before about DSL's most limiting factor when it comes to faster broadband is the line noise that degrades signals on twisted pair copper phone lines as they travel. The further those signals travel, the slower DSL speeds become due to the noise. Phone companies can add additional twisted pairs or use a noise-limiting technology called vectoring in an attempt to get faster speeds. Both require expensive infrastructure upgrades.

Broadband Reports points to a good analysis by a phone industry analyst that debunks the hype that these infrastructure upgrades have the ability to push DSL beyond 50-100 Mbps in a real-world setting. But even that speed is years away on DSL because it requires multiple twisted pairs and vectoring that currently aren't part of the existing telephone infrastructure. 

The bottom line - 800 Mbps DSL might be possible in a lab, but it's not going to be coming to phone customers anytime soon.  Most people who care about speed stick with cable broadband.  And, as I previously announced, Insight's 50 meg service is just around the corner.

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It's also important to note that VDSL2 is dedicated last-mile bandwidth to each home. While a lot of Cable providers can offer 100 Mbps burst rate, their entire node supporting 250 homes might only have 160 Mbps of total capacity.

[George Ou]

32 Mbps VDSL3 sync rates over a single copper pair are possible over a majority of existing FTTN customers. 25 Mbps sync rates have an even higher success rate.

With vectoring technology and two copper pairs, 60+ Mbps will be possible in most homes and that's great news for the Telco industry.