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DSL-Corner: Line codes for various flavors of DSL

Overview

DSL, or Digital Subscriber Line, is a data communication techniques to transport high bitrates via ordinary telephony wiring. A typical telephony cable is build-up from twisted pairs (two copper wires, mutually twisted).
Different flavours of DSL have been standardized, including:

names modulation wire pairs transition band
HDSL PAM 2B1Q
CAP/QAM, FDD
3
2
1
SDSL or SHDSL TC-PAM (multilevel), FDD 1 or multiple bitrate dependent
mostly below 1 MHz
ADSL, ADSL2, DMT, FDD 1 0 - 1.1 MHz
ADSL2plus DMT, FDD 1 0 - 2.2 MHz
VDSL CAP/QAM, FDD
DMT
1 above 1.1 MHz
VDSL2 DMT, FDD 1
2 (bonded)
numerous, up to profile 35b
G.fast DMT, TDD 1 106MHz (current)
159MHz,
212MHz,
424MHz(future?)

ADSL, SDSL and HDSL are getting out-dated. VDSL is widely deployed beyond 100Mb/s, and G.fast will bring that beyond 500MHz over a single wire pair .

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