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HDSL
Highdatarate Digital Subscriber lLne. One of four DSL technologies. HDSL delivers 1. 544 Mbps of bandwidth each way over two copper twisted pairs. Because HDSL provides T1 speed, telephone companies have been using HDSL to provision local access to T1 services whenever possible. The operating range of HDSL is limited to 12,000 feet (3658. 5 meters), so signal repeaters are installed to extend the service. HDSL requires two twisted pairs, so it is deployed primarily for PBX network connections, digital loop carrier systems, interexchange POPs, Internet servers, and private data networks. Compare with ADSL, SDSL, and VDSL.
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A technology that dramatically increases the digital capacity of ordinary telephone lines (the local loops) into the home or office. DSL speeds are tied to the distance between the customer and the telephone company’s central office.
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Digital Subscriber LineDigital subscriber line.
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A generic term for “telephone” wire used to carry data such as 10BaseT and 100BaseT. Various categories (qualities) of cable exist that are certified for different kinds of networking technologies. A twisted-pair wire that does not include additional EMI protection. Most twisted-pair wiring is UTP.
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Deployment of FDDI using twisted-pair (in other words, copper) wires. This reduces the maximum segment length to 100 meters and is susceptible to interference.
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A digital end-to-end communications mechanism. ISDN was developed by telephone companies to support high-speed digital communications over the same equipment and infrastructure that is used to carry voice communications. An emerging technology that is beginning to be offered by the telephone carriers of the world. ISDN combines voice and digital network services in a single medium, making it possible to offer customers digital data services as well as voice connections through a single wire. The standards that define ISDN are specified by ITUTSS.
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