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Many customers are extremely price sensitive and cannot afford cost of a T1 which can be as much as 20 times more expensive than a DSL connection (although prices have come down drastically in recent months). Residential customers who are most sensitive to price should not consider a T1 circuit unless then have a business reason to pay for such a circuit and cannot access DSL service. Most people don't realize that a DSL connection can be just as fast as a T1 at 1.5Mbps. The shortcoming of DSL is that it is oversubscribed. This means there is a finite amount of bandwidth available and a customers speed can drop if other customers in neighborhood decide to use their service. SDSL (Synchronous DSL) is a business class DSL and is ranked as a higher priority than residential DSL or ADSL (Asunchronous DSL). This means it is not oversubscribed to extent than ADSL and is subject to fewer bandwidth restrictions.
In short, if price is your critical factor go with DSL. If reliability is critical factor purchase a dedicated T1.
Michael is the owner of FreedomFire Communications http://ld.net/mscprez and http://DS3-Bandwidth.com .......delivering choices to both residential and business consumers for voice and data broadband services. Michael also authors BroadBand Nation http://BroadBand-Nation.blogspot.com where you're always welcome to to drop in and catch up on the latest BroadBand news, tips, and ramblings for the masses.