xDSL Comparisons
DSL Type
IDSL, ISDN Digital
Subscriber Line
HDSL, High Data
rate digit. Subsc. Line
SDSL, Single line
Digit. Subsc. Line
ADSL, Asymmetric
Digit. Subsc. Line
RADS, Rate-Adaptive
Digit. Subsc. line
VDSL, Very high data rate
Digit. Subsc. Line
Distance
4000 - 6000 m
Up to 4000 m
Up to 3000 m
Downstream is affected
by distance: from 3000
up to 6000 m
for decreasing speed
4000 - 6000 m
From 300 up to 1500 m
for decreasing speed
Upstream
Transmission Rate
128 Kbps
- 768 Kbps
- 1,544 Mbps with
2 twisted-pair lines
- 2,048 Mbps with
3 twisted pair lines
From 16 to 640 Kbps
From 128 Kbps to 1 Mbps
From 1,5 to 2,3 Mbps
Downstream
Transmission Rate
128 Kbps
- 768 Kbps
- 1,544 Mbps with
2 twisted-pair lines
- 2,048 Mbps with
3 twisted pair lines
- 1,544 Mbps with 1 line
- 2,048 Mbps with 1 line
From 1,5 to 9 Mbps
From 600 Kbps to 7 Mbps
From 13 to 52 Mbps
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