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9.4% 5 byte overhead within 53 byte ATM cell
0.5% 8 byte PPPoE overhead
1.3% 20 byte IP overhead
1.3% 20 byte TCP overhead
12.5% Total Communication Overhead (minimum)
Important Note: Some speed test sites measure the advertised data rate while others measure real world file transfer rates. Sites that calculate actual end user file transfer rates take into account the transport overhead and will show a lower overall speed rate when compared to sites that measure data rates.
Andy Houtz DSL