The information afterwards is not my words. I got it off of www.examnotes.net. It was written by a guy that frequents their forums who works in the telecom industry, doing work related to WAN type installations, including DSL. Here's what he said about the subject:
ADSL. Asymmetric Digital Subscriber Line. A term for one-way T1 transmission of signals to the home over the plain old, single twisted-pair wiring already going to homes. ADSL modems attach to twisted pair copper wiring. ADSL is often provisioned with greater downstream than upstream rates (hence "asymmetric"). These rates are dependent on the distance a user is from the central office and may vary from as high as 9 Mbps to as low as 384 Kbps. HDSL. High bit-rate Digital Subscriber Line. The oldest of the DSL technologies, HDSL continues to be used by telephone companies deploying T1 lines at 1.5 Mbps and requires two twisted pairs. IDSL. ISDN Digital Subscriber Line. IDSL provides up to 144-Kbps transfer rates in each direction and can be provisioned on any ISDN capable phone line. Unlike ADSL and other DSL technologies, IDSL can be deployed regardless of the distance the user is from the central office. RADSL. Rate Adaptive Digital Subscriber Line. Using modified ADSL software, RADSL makes it possible for modems automatically and dynamically to adjust their transmission speeds. This often allows for good data rates for customers residing greater distances from the CO. SDSL. Single-line Digital Subscriber Line or Symmetric Digital Subscriber Line. A modified HDSL software technology, SDSL is intended to provide 1.5 Mbps in both directions over a single twisted pair. However, the distance over which this can be achieved is less than 8,000 feet. VDSL. Very high-rate Digital Subscriber Line. The newest of the DSL technologies, VDSL can offer speeds up to 25 Mbps downstream and 3 Mbps upstream. Similar to SDSL, the gain in speed can be achieved only at short distances. These maximum speeds can be achieved only up to 1,000 feet. Sometimes also called broadband digital subscriber line (BDSL). xDSL. A generic term for the suite of digital subscriber line (DSL) services, where the "x" can be replaced with any of a number of letters. See also DSL, ADSL, HDSL, IDSL, MDSL, RADSL, SDSL, VDSL. ""Brian Zeitz"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > I have 2 Verizon DSL lines, one is 1.5M down/128k up. The second is > 768k/768k up and down. They both have dynamic IPs. My question is; Are > these > both ADSL lines? My boss thinkins the one 768k/768k is SDSL. I dont > think it > is, first of all, both lines have the same modem. If the one like was > ADSL, > and the other was SDSL there would be a different kind of modem. Or does > SDSL require a modem at all? These are both Verizon lines, but i am > confused > on the naming. On my order it says they are both ADSL lines. Any input > would > be appreciated, is my boss right, or am I right? > > > > According to verizon's website ( I don't take this as the final word > however) > > > > What is the difference between DSL technologies such as SDSL, ADSL, > IDSL, etc.? > > Most small businesses are connected to an asymmetric (ADSL) line. ADSL > matches the Internet utilization of most users by providing higher > downstream capacity for browsing or downloading. Symmetric DSL (SDSL) > is a variation of ADSL, but provides the user with the same speed for > both downstream and upstream applications. Verizon Online Business DSL > portfolio of DSL speeds provides our Business customers with solutions > that meet their specific Internet application needs. > > > > Ok that being said, why can i use the same modem on the ADSL line and > the SDSL line. Why do they make specific > > modems for SDSL if they are both the same technology? > > > > Thanks, > > > > Brian Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54917&t=54909 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
