SHDSL -- Why Hasn't It Replaced SDSL?

Are you frustrated by the pace of connectivity improvements? For how many years has (small) business been stuck with SDSL for affordable connectivity?

SHDSL was supposed to supplant SDSL as of 2003 (or so) I thought, but I never see advertised speeds go beyond a 1.5 Mbps SDSL line... SHDSL goes to 2.3 Mbps and has other advantages over SDSL (longer loop lengths for given speeds, less interference with other data lines, 4-wire mode). I'm not that well educated on the topic, but I also had the impression there could be some cost savings.

Today T1's are often delivered using this technology, but why not offer SHDSL from the customer to DSLAM like a normal dedicated DSL line.... and give customers the speed they want, distance depending???

Are ISPs just not ready to upgrade their DSLAM equipment, or don't want to cannibalize their higher priced bonded T1 services?

You may not need the SLA of a real T1, but you'd sure love 2.3 Mbps up and down for let's say $150/mo or so.

First.... you have to look at who is selling SDSL. Basically Covad and a few small CLECs. They bought non-standards-based SDSL long ago and they are still using the equipment.

Given the financial state of Covad I can see why they aren't going around ripping out all their DSLAMs.

There may be some hope though, with the new Earthlink money they are upgrading DSLAMs to support LPV and ADSL2 in larger markets. I *think* that the new DSLAMs will also be offering new SDSL speeds as well, which probably means SHDSL (and finally the ability to hook a real router up to an SDSL line).

Most DS-1s today are delivered using either HDSL or HDSL2 on 1 or 2 pairs.

Your ILECs aren't going to upgrade equipment necessarily because of the availability of a different technology. Even with existing technology many consumers and businesses are in a fight just to be able to get ADSL services.

Covad, XO, etc. that are selling SDSL services already may not upgrade given their investment in existing equipment.... and given the state of competition now for internet services.

With the price of service dropping to $12.99/mo and the uptake of those discounted services increasing, I wouldn't want to be one of the other players and be making large capital expenditures for upgrades right now. I'd be worried about staying in business. People are price driven.....

Just my opinion though, take it for what it's worth.

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com. Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

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Why Am I Getting Low Speed Results On My Broadband Test?

You may have already run a few tests and found that even though you are paying for, say, an 8 Mb package, you're actual broadband speed test results are much slower.

Firstly, when your Internet Service Provider advertised your, for example, 8 Mb package what they meant was that your optimum speed was 8 Mb. That means that barring any interference between your PC and your router, distance from the exchange, line quality, applications running on your PC, and of course your contention ratio, that you should theoretically get speeds of 8 Mb.

With ADSL broadband an important factor in determining your highest speed is how close you are to your local exchange. Some broadband availability checkers will also have a Show Map section that you can click. This will show you how close you are to the exchange. The further you are, the slower your connection will be. If you have a great quality line this difference may be negligible i.e. you may get 20 Mb speeds rather than 24 Mb speeds but who really needs broadband that fast anyway unless you are a business or an online gaming addict.

On the other hand if you are reasonably close to the exchange but you are still getting slow speeds, another factor to look at is the actual broadband package you are subscribing to. You may have been early to jump on the broadband wagon but now still have a 512 Kbps connection, the common connection a few years ago. However since then we have seen broadband speeds of up to 24Mb. Definitely investigate a package upgrade, as these days you can affordable get double and triple those early speeds.

Another factor is your contention ratio. Between you and the exchange there will be a number of houses connecting to broadband using the same network connection and this number will affect the speeds you receive. So for instance if you have a contention ratio of about 40:1 which is average, this means that 40 people share that bandwidth. Businesses often pay for lower contention rates of 20:1 and 10:1 so that their connection is always as fast as possible. Often your slow speeds are caused by having a high contention ratio.

You can improve your broadband test results by either getting a better package with your service provider, or just by contacting them and asking them to look for any faults in the line. Also make sure that your PC has a decent chunk of memory free. If you are right up to the brim you will find your internet is very slow. Also make sure the path between your router, if wireless, and your PC is as clear as possible, as the more objects between them the more interference there will be with the speed. There is also software available that will help boost your connection like ONSPEED.

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