xDSL a Possible Tool in Network Designers Kit
Actually a number of similar technologies, hence the "x" in xDSL, digital subscriber lines were developed for the phone companies to carry high-speed data signals over voice-grade copper pairs. This is where the similarity ends. In most cases, the variations of xDSL do not interoperate. BICSI: A Telecommunications Assoc.The Many Flavors of xDSL
BICSI: A Telecommunications Assoc. "Standards" Based BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. Proprietary BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. HDSL BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. Paradyne MVL BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. SDLS BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. Nortel 1 Meg Modem BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. ADSL and RADSL BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. EtherLoop BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. IDSL BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. 3 Com 10Base-S BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. G.Lite BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. Cisco EZ-DSL BICSI: A Telecommunications Assoc. |
BICSI: A Telecommunications Assoc. VDSL BICSI: A Telecommunications Assoc. |
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HDSL: High-bit rate DSL
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BICSI: A Telecommunications Assoc. 1.5 Mbps symmetric to 12,000 ft
BICSI: A Telecommunications Assoc. SDSL: Single pair DSL
BICSI: A Telecommunications Assoc. 768 Kbps symmetric to 12,000 ft
BICSI: A Telecommunications Assoc. ADSL: Asymmetric DSL; RADSL: Rate-adaptive DSL Up to 8 Mbps downstream and up to 1 Mbps upstream at 12,000 ft, and lower speeds up to 18,000 ft
BICSI: A Telecommunications Assoc. IDSL: ISDN DSL 128 Kbps symmetric to 18,000 ft (uses ISDN line code)
BICSI: A Telecommunications Assoc. G.Lite (Universal DSL) 1.5 Mbps downstream and 256 Kbps upstream at 12,000 ft
BICSI: A Telecommunications Assoc. VDSL: Very high-bit rate DSL 52 Mbps downstream and 2 Mbps upstream at 1,000 ft, 13 Mbps downstream and 2 Mbps upstream at 5,000 fee
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xDSL has the greatest potential use in non-telco settings such as hotels and multi-unit dwellings such as apartment building. The managers of these facilities often are interested in offering xDSL services such as high-speed Internet access or video-on-demand to tenants to make the properties more competitive. BICSI: A Telecommunications Assoc.xDSL is often the only way to retrofit high-speed data pathways into these buildings. BICSI: A Telecommunications Assoc."This is especially the case where adding new data cables would be a problem, but where telephone wire is already in place," Callahan said. BICSI: A Telecommunications Assoc.Obstacles to traditional structured wiring might include:
- No place to put it: For example, an old building with wiring conduits that are cast in the floor and the conduits are simply out of space.
- Too few drops: In some cases the potential number of users for a data service are too few to justify the cost of a cabling job.
- Need it fast: The customer or the installer simply does not have the time to do a cabling job.
A characteristic of xDSL is that it only works on copper loops. If, for example, it is used to supply Internet access, xDSL will transmit data to and from the access multiplexer usually located in the wiring closet for a hotel or at the local central office in the case of telephone company-provided xDSL services. BICSI: A Telecommunications Assoc.The link between the digital subscriber line access multiplexer, or DSLAM, up to the Internet service provider is not xDSL, but a more traditional wide-area link. The high cost of this uplink, often a 45 Mbps T-3, can be a project killer, Callahan said. BICSI: A Telecommunications Assoc.About <%=company%>
Founded in 1974 and originally known as the Building Industry Consulting Services International, BISCI is an industry association that focuses on the technical aspects of combining communication cabling designs with the process of building design. Approximately 3,000 network designers, cable technicians, contractors, and installers attended the BISCI Winter Conference.