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participated Many of the new features described above have been implemented, and several of those features are interoperable within the collective community With some further technology work still to be done, ADSL2 and ADSL2plus are poised for a rapid deployment of new features and services for the ADSL user community ADSL is con guring and delivering the present and future broadband communications for the home user via the one-hundred-year-old POTS cable plant, all without the need to deliver more copper and without impacting the existing voice services in which RBOCs have invested so heavily
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104 SHDSL technology
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While ADSL provided a bene cial mechanism for broadband delivery in the asymmetric space, the technical community sought a means for replacing existing expensive T1 technology with a symmetric methodology In North America, the ANSI T1E14 Committee began work on a new standard version: High bit-rate Digital Subscriber Line second generation (HDSL2) The HDSL2 standard, captured in the document ANSI T1418-2000, uses a different transmission method in order to achieve 1544 Mbps symmetric transmission over the same frequency spectrum It is possible that it could support rate adaptive services in the future, allowing lower speed access on even longer loops The new method incorporates pulse amplitude modulation (PAM) line code, a coding scheme, higher transmission power and special pulse shaping for spectral compatibility with other existing services This method achieves an improvement of up to 7 dB over 2B1Q HDSL, its technical predecessor, and provides cost bene ts since only one data pump per modem is required to provide symmetric 1544 Mbps instead of the original two, thus saving a copper pair in the cable plant The downside at present is the high complexity and high power required for such a solution [9] The ANSI T1E14 Committee established a clear direction for the evolving HDSL2 technology The committee agreed to use trellis-coded PAM (TC-PAM) line coding with a modi ed OPTIS (overlapped PAM transmission with interlocking spectra) spectral shape The shaping of the HDSL2 signal reduces crosstalk to a controlled level, in order to enable telecom operators to deploy different types of DSL, including HDSL2 and ADSL, on the same bundle of lines While spectral compatibility is a very important area of study and standardization in the ANSI Committee, HDSL2 eventually became the North American position on the standardized technology called Single-pair High bit-rate Digital Subscriber Line (SHDSL) technology ITU-T Study Group 15, Question 4 began work in early 1999 on the ITU-T G9912 (Gshdsl) Recommendation, with a nal version rati ed in February 2001 The work done in ETSI TM6 on the SDSL standard became the European input to the Gshdsl standard, making a symmetric solution that contained a common base worldwide and supported regional differences and technology evolution SHDSL is designed to provide a exible replacement to the worldwide usage of symmetric digital data transmission, by implementing in the standard design several different line rates over the copper communications channel These line rates coincide with existing line rates in the eld, such as T1, fractional-T1, ISDN-BRI, T3, E1, fractional-E1, E3, HDSL, ADSL upstream and downstream, and others [10] Further, SHDSL does not support a native voice channel in the spectrum, allowing data only transmission to dominate the communication channels between the central of ce and
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customer premises equipment As a result of SHDSL s support of a vast collection of existing and future symmetric line speeds, the technology is dependent on the handshaking standard, ITU-T G9941 (Ghs) This handshaking protocol is used in combination with all of the ITU-T G99x Recommendations to cause the central of ce and customer premises equipment to determine what devices are on each end of the copper communications channel, and to set the best possible technology and rate attempts that the end devices can support [11]
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