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词条 High bit rate digital subscriber line 2
释义

  1. References

  2. External links

High bit rate digital subscriber line 2 (HDSL2) is a standard developed by the American National Standards Institute (ANSI) Committee T1E1.4 and published in 2000 as ANSI T1.418-2000.[1][2][3] Like its predecessor HDSL, HDSL2 provides a symmetric data rate of 1,544 kbit/s in both the upstream and downstream directions at a noise margin of 5-6 dB.[3] Its primary purpose was also to provision a T-1 line, only this technology relies on fewer wires - two instead of four - and therefore costs less to set up.[3] The modulation technique used in HDSL2 is TC-PAM, which is also used in G.SHDSL, as opposed to 2B1Q in HDSL. Spectral shaping is applied to increase compatibility with ADSL and HDSL2 on the same bundle.[4] HDSL4 provides the same bitrate as HDSL2, but uses four wires instead of two, to increase robustness.[4] On a AWG26 local loop, the reach of HDSL2 is {{convert|9000|ft|km}}, while that of HDSL4 is {{convert|11000|ft|km}}.[4]

References

1. ^{{cite web |title=ATIS 0600418.2002(R2011): High bit rate Digital Subscriber Line - 2nd Generation (HDSL2/HDSL4) Issue 2|accessdate=2013-12-26 |publisher=ATIS |date=2002-01-05 |url=http://webstore.ansi.org/RecordDetail.aspx?sku=ATIS-0600418.2002%28R2011%29}}
2. ^{{cite web |url=http://www.inf.puc-rio.br/~inf2056/inf2056_files/menu/trabalho/HDSL2-overview.pdf |title=HDSL2 Tutorial: Spectral Compatibility and Real-World Performance Advances | last=Zimmermann |first=George A. |publisher=PairGain Technologies |date=1998-06-25 |accessdate=2013-12-26}}
3. ^1 2 {{cite web|url=http://misnt.indstate.edu/harper/HDSL2.htm |title=HDSL2 |last=Ferguson |first=Krista |date=1999 |accessdate=2013-12-26 |deadurl=yes |archiveurl=https://web.archive.org/web/20100728162059/http://misnt.indstate.edu/harper/HDSL2.htm |archivedate=2010-07-28 |df= }}
4. ^1 2 {{cite book |title=DSL Advances |editor1-last=Starr |editor1-first=Thomas |isbn=0-13-093810-6 |location=Upper Saddle River, NJ |publisher=Prentice Hall |url=https://books.google.com/books?id=VWaMdIq2w8QC}}

External links

  • {{Cite web |title=An HDSL2 Primer |work=Comm Design |author=Jim Quilici |url=http://www.commsdesign.com/main/1999/08/9908feat2.htm |deadurl=yes |date=August 1999 |archiveurl=https://web.archive.org/web/20020527231452/http://www.commsdesign.com/main/1999/08/9908feat2.htm |archivedate=2002-05-27 |accessdate=2013-06-23}}
{{DSL technologies}}{{telecomm-stub}}

1 : Digital subscriber line
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