Knowledgebase
ADSL Speed Versus Distance
Posted by Roy Panetta on 12 December 2011 11:16 AM

Balanced pair cable has higher attenuation at higher frequencies, hence the longer the wire between DSLAM and subscriber, the slower the maximum possible data rate. The following is a rough guide to the relation between wire distance and maximum data rate. Local conditions may vary, especially beyond 2 km, often necessitating a closer DSLAM to bring acceptable speeds:

     Speed Mbit/s

     Distance (km)

     25

     0.30

     24

     0.6

     23

     0.9

     22

     1.2

     21

     1.5

     19

     1.8

     16

     2.1

     1.5

     4.5

     0.8

     5.2

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