More than four years ago one of our engineers wrote about uselessness of UMTS connections for inter-router backup links and although I got numerous comments trying to explain the issues I never found a good explanation that a simplistic networking engineer like me could understand.
Ilya Grigorik fixed that. His Breaking the 1000 msec Time-to-Glass Mobile Barrier talk has some real-world statistics, and a fantastic description of how 3G/4G networks work and what causes the enormous latencies. His High Performance Browser Networking book has even more details. Enjoy!
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