Flavors of DSL:HDSL

Repeaterless T1

• HDSLv1 (~1991)

  • 2 transceivers
  • 2 lines @ 772 kbps
  • each full duplex, echo cancel
• up to 9 Kilofeet (26-gauge)
• 2B1Q modulation
• stays within crosstalk range

HDSLv2 (~1997)
one pair

up to 9 Kilofeet (26-gauge)
Phase amplitude modulation
stays within crosstalk range

Inverse

Mux

XMT

RCV

Echo

Cancel

Line

Coupler

?

240 kHz

bandwidth

772 kbps

XMT

RCV

Echo

Cancel

Line

Coupler

?

240 kHz

bandwidth

772 kbps

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