symmetrical DSL
IDSL, SDSL, HDSL There is also G.SHDSL which has 5.3 MB symetrical
ADSL and VDSL
G.shdsl Symmetrical DSL (SDSL)High bit-rate DSL (HDSL)
SDSL- symmetric digital subscriber line
Speed is the difference between HDSL and ADSL. HDSL has high upload and download speeds whereas ADSL has a slow upload speed coupled with a high download speed.
Symmetric digital subscriber line (SDSL)
of cause is SDSL
I hope the answer must have already been clear. But still, let me give you a proper conclusion. DSL modem can have two types, SDSL and ADSL. Though, most of the times when we use the word DSL, we generally refer to the ADSL modem, but in certain cases, it can even be the SDSL modem. Hence, this is the difference. An ADSL modem can send and receive data at different speeds while SDSL modem can send data at only one speed.
symmetric DSL (SDSL)
Digital signal processors (DSPs)
You might need to get an SDSL when setting up a new business if one is using VoIP service. It is cheaper than a T1 line. It has user advanced security to help protect against business intruders.
Adsl sdsl isdn t-1 lines