WHAT IS SDSL?
- Definition
- Information about
- Uses of SDSL 

ADVANTAGES
- High Speed
Access
- Connectivity

HARDWARE
- Modem
- NIC/Ethernet Card

     

With the many different high speed Internet services available today, DSL has grown to become very popular among businesses and residential consumers.  Even though dialup modems have been a continuous success, information has grown bigger and bigger and many people and corporations need a faster way of exchanging computer data between each other.  That is when DSL technology comes into sight.  

SDSL is an acronym that stands for Symmetrical Digital Subscriber Line.  It is called symmetrical because it allows same data rates to travel in upstream and downstream traffic.  In other words, if my connection for downstream would go to a max of 784kbps, then the upstream speed can go as that high also.  Dialup connections with 28Kbps and 56Kbps modems are not symmetrical.  That is why if a user was downloading a file at 4kb/s, then through a dialup modem they can upload at about 2k/s.  Why are they not symmetrical?  Well there are protocol standards made so that data exchanged between one computer and another are received/sent correctly.  It also has to do with error control, modulation and data compression that allows computer information to be carried through a line the best way it can.  Data inside the computer is digital and regular phone lines only allow analog signals to travel through.  So these modems change the data over to the other format where the other computer receiving the data has a modem that will modulate it back into digital data.