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Recently there have been discussions on some lists about carrier redundancy.  I figured I would sum up some thoughts and add my own,

In today’s world of consolidation, takeovers, and cost saving measures carrier redundancy is something one should pursue with due diligence.  Below are some questions to know about your existing provider and any future providers. If you know this you can compare the differences between two providers.  By knowing the answer to these questions you can add two carriers which will complement each other.

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You have several options for bringing a connection into your area to re-distribute to your customers. I will outline these and then go into further detail

-Leased Lines (Fractional, T-1, T3, etc.)
-Fiber Optic
-Wireless backhaul
-Cable
-DSL

Leased Lines are the most easily accessible across the United States. Most phone companies can provide t1 service to almost anywhere. This is because T1 service uses the existing copper already at 99% of locations. If you have a phone line you can almost always get t1 service. Once you go beyond T1 things get a little more complicated. However, T1 has the ability to do bonding if the carrier and telco support it. You essentially buy multiple T1s and combine them into a single “pipe”. This requires the provider to support bonding as well as some special configuration on your routers.

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