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SDSL Bandwidth
Guide to SDSL High-Speed Internet Connectivity

 

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The data transfer capacities for both ADSL and SDSL depend on the a number of factors, however, the distance from the telephone exchange to the computer is the most important. The shorter the distance, the higher the bit rate. 

Another factor that impacts throughput capacity is the nature of the "twisted pair" telephone wiring that connects the telephone exchange to the home or business where the computer is located.  The telephone infrastructure in Europe in general supports higher capacities than in North America.

Although ADSL in theory can support data transfer rates of 1.5 to 9 Mbps (megabits per second) when receiving data, it can only send data at speeds of 16 to 640 Kbps. By comparison, SDSL can support data transfer rates ranging from 1 to 3 Mbps in both directions.

The following table shows theoretical minimum and maximum transfer rates for ADSL and SDSL in bits/second:

  SDSL Upstream SDSL Downstream ADSL Upstream ADSL Downstream
Minimum 1,000,000 bits/sec 1,000,000 bits/sec 16,000 bits/sec 1,500,000 bits/sec
Maximum 3,000,000 bits/sec 3,000,000 bits/sec 640,000 bits/sec 9,000,000 bits/sec

 

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