Petrozavodsk State University, Alex Moschevikin, 2004

1
Digital Subscriber Line

• ?????????? ?? ?????? ??????
• Yaakov J. Stein. Introduction to xDSL. Part III.
• ?????????? ???????????? ???????. (??????)
  seti.sut.ru/admin61/editor_files/file_upload/t11_1
  2.pdf
• http//www.paradigm.com.tw/Support_FAQ-ADSL.html

Rev. 2.01 / 19.04.2014
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
2
?????????????? DSL
???????? ???????? ?????? ?? ?????????? ????????.
????????????? ???????? ????? ? ?????? ?????????
?? ????????. ???????????? ??????? ???????????
??????????? ?????? 1.1 ???. ??????
????????????? xDSL (?????????????) ????????????
?????????? ????? ???????? ????????.
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
3
???? ???????????? ? ???
1.5 Mbps 5.5 ?? (80 ????????? ? ???) 2 Mbps 5
?? 6 Mbps 3.5 ?? (CSA 50 ????????? ? ???) 10
Mbps 2 ?? 13 Mbps 1.4 ?? 26 Mbps 900 ?? 52
Mbps 300 ?? (SONET OC-1 1/3 STM-1)
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
4
??????????? ????????????
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
5
???????????? ??????????
http//www.freenews.fr/spip.php?article5495
DSLAM
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
6
DSL ??????
http//cis.msjc.edu/csis202/lessons/skill3/physica
l.asp
?, B ????????? DSLAM Digital Subscriber Line
Access Multiplexer ???????????? DSL PSTN
Public Switched Telephone Network ??????????
????
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
7
ATM over DSL
DSL ??????? ????? ??????? ????????????
??????????? ??? ???? ???. ? ???? ??????
?????????? DSL-?????, DSLAM, BRAS ?????? ? ????
ATM.
ATM
BRAS - Broadband Remote Access Server - ??????
??????????????? ?????????? ???????, ?????????
????????? ??????????? ??????? ?? ?????????????
ADSL ?? ?????? ?????? ???????? ?????? ?????????
???????.
IP
PPP
AAL-5
ATM Layer
ADSL superframe
???? ??????????
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
8
????????????? DSL
???????? ???????? ?????????? ??????????
IDSL 160 (144) kbps 5.5 ?? ???????? ? ISDN, ????? ?????????-?????, ????????? ?????
HDSL 2 Mbps (2-3 ????? ????) 3.6-4.5 ?? c??????????? DSL, ?????? T1/E1, ????? ????? ???
HDSL2 2 Mbps (1 ????? ????) 3 ?? "
SHDSL 5.6 Mbps lt1.5 ?? "
ADSL 8 Mbps DS 3.5-5.5 ?? ?c??????????? DSL, ?????? ? ????????, ????? ?? ???????
G.lite 1 Mbps DS 5.5 ?? ????????? ADSL (?? ????? ????????), ?????????? ?????????, ?????? ? ????????, VoIP
ADSL2 12 Mbps DS 1.5 ?? "
ADSL2 24 Mbps DS lt1 ?? " , ??????????? ?????? ??????
VDSL (VDSL2) lt52 Mbps DS, (100 Mbps) 300 ? 1 ?? ???????????? (???????? ?? 6 Mbps) ? ????????????? DSL, ????????? ????, HDTV
DS downstream
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
9
?????? ???????? ? ADSL

• 3 ?????? ? ADSL (Asymmetric DSL)
• ???????? ???? (POTS Plain Old Telephone
  Service)
• ???????????????? ????? Downstream
• ????? ?????????? ????? Upstream
• ?????????? ???????? ??????????? ???-??
  ?????????? ?????? upstream/downstream 110.

http//www.paradigm.com.tw/Support_FAQ-ADSL.html
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
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ADSL DMT ?????????
DMT ????????? Discrete MultiTone. 256
?????????? ?? 4.3125??? ???????????? ?????????
QAM ? ?????? ??????. ??????, ??????? ??????????
?????????, ??????????? ??????? ? ???????????? ?
?????? ?????????. ??? ?????????? ???????????
???????? (????????? ??????????? ??????/???)
??????? ?????????? ?????? ?????????? ?? ?????
?????? ???????? (??????????). ???? ????????
???????? ????? ??????? ?????????? S/N, ? ???
???????????? ????? ??????? ???????????
QAM. ????????? ????? ??????? ??????? ????? ??????
????????, TxPower (downstream) 20dBm, TxPower
(upstream) 7dBm.
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
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ADSL CAP ?????????
CAP ????????? Carrierless Amplitude and Phase
???????????? ????????? ? ??????????? ???????.
??????????? ??????? ?? ???????? ??????? (NEXT,
FEXT ?????????).

• Downstream
• 64 ??????????-??????? ?????????
• ?????????? ???????? 266.67 ???
• ?????????? ??????????? 1.6 Mbps
• ???????? ??????????? 12 dBm
• ?????? gt300 ???

• Upstream
• 16 ??????????-??????? ?????????
• ?????????? ???????? 6 ???
• ?????????? ??????????? 24 kbps
• ???????? ??????????? 4.8 dBm
• ?????? 96102???

Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs
12
ADSL CAP vs DMT
seti.sut.ru/admin61/editor_files/file_upload/t11_1
2.pdf
Petrozavodsk State University, Alex Moschevikin,
2004
NETS and OSs