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.
IDSL, SDSL, HDSL There is also G.SHDSL which has 5.3 MB symetrical
symmetrical DSL
G.shdsl Symmetrical DSL (SDSL)High bit-rate DSL (HDSL)
Different standards depending on where you are at, but here in the United State some of the Telecom Circuit Types are as follows: B1 DS0 (56K Channel) DS1/T1 (European near equivalent is E1) DS3/T3 (European near equivalent is E3) SONET (OC1, OC-3, OC-12, OC-48, OC-192, OC-768) - (European near equivalent is SDH) xPON (passive optical networking) ACTIVE ETHERNET BRI (Basic Rate Interface) PRI (Primary Rate Interface) Services that are provided on these can be any of the following: ETHERNET ISDN (PRI or BRI) ADSL SHDSL E.SHDSL HDSL EOS (ETHERNET OVER SONET) RPR (RESILIENT PACKET RING) ATM (ASYNCHRONOUS TRANSFER MODE) FRAME-RELAY MPLS GPON EPON GEPON APON SIP TRUNKING
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