Flavors of DSL:ISDN (also IDSL)

64 kbps

160 Kbps bidirectional

• Two 64 Kbps channels
  • voice circuits
  • data channels
  • can be bonded for data
• Two 16 Kbps channels
  • 1 signaling channel
  • 1 packet data channel
• Up to 18 Kilo-feet (24-gauge)
• 2B1Q modulation uses 80kHz
• Separate line from POTS

Mux

16 kbps

16 kbps

64 kbps

XMT

RCV

Echo

Cancel

Line

Coupler

?

80 kHz

bandwidth

160 kbps

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