You may think the answer to this question is complicated.
Well ..
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not really.
THE NON-OBVIOUS ANSWER T1 OVER DSL: PCI Compliance If you have a retail business that has to comply with PCI Compliance and Retail Data Security..
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be careful.
Ignoring the PCI Compliance standard is risky.
Retailers can be fined and even lose card processing privileges.
Network Security Compliance is Mandatory for Retailers, Banks, and other Financial Institutions ..
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and any companies saving or transmitting personal data over the internet.
Identity theft is the main driver behind this compliance.
So when you are networking with DSL, often the cheap routers, access devices, firewalls, VPN appliances, and Wireless LAN's that come bundled with them will fail a PCI Audit.
But there are some exceptions.
THE OBVIOUS ANSWER: You ask "When would you choose a T1 over DSL?" Bandwidth is transmission capacity.
But when your needs for a more robust, dedicated circuit with an SLA OUTWEIGH the additional costs, then you pick a T1.
DSL Pros: Inexpensive, most bandwidth for the buck.
DSL Cons: Weaker SLAs, Slow Mean Time To Repair, Aggregated service.
T1 Pros: Dedicated 1.
544Mbps, Good SLA, Most problems fixed remotely.
T1 Cons: More expensive to to the cost of the local loop to the central office.
DS3 Pros: 45Mbps is as fast as 29 T1s, you are riding on Fiber over Sonet not copper like DSL and T1s so you are not subject to copper corrosion and degradation.
DS3 Cons: It may be overkill for a SMB and the Cost of the Local loop is far more.
For help in finding the best voice / data network solution for your business network ..
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especially with consideration for the various T1 Bandwidth configurations ..
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take advantage of the free help from DS3-Bandwidth.
com.