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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here
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To: Bernard Levy who wrote (4099)6/9/1999 11:13:00 AM
From: Darren DeNunzio  Read Replies (1) of 12823
 
Transmission Speeds

Transmission speeds over 24-gauge wire for some of the access
types discussed on this thread.

Cable modem speed shown is over coaxial.

┌──────────┬────────────────────────────┬───────────────────────┐
│Type │Speed │Distance Limitation │
│ │ │(24─gauge wire) │
├──────────┼────────────────────────────┼───────────────────────┤
│56 Kbps │56 Kbps downstream │None │
│modems │28.8 or 33.6 Kbps upstream │ │
├──────────┼────────────────────────────┼───────────────────────┤
│ISDN │Up to 128 Kbps │18,000 feet │
│ │(uncompressed) │(additional │
│ │Full duplex │equipment can extend │
│ │ │the distance) │
├──────────┼────────────────────────────┼───────────────────────┤
│Cable │10─30 Mbps │30 miles over │
│modem │downstream │coaxial (additional │
│ │128 Kbps ─ 10 Mbps │equipment can extend │
│ │upstream │the distance to 200 │
│ │ │miles) │
├──────────┼────────────────────────────┼───────────────────────┤
│ADSL Lite │Up to 1 Mbps │18,000 feet │
│ │downstream │ │
│ │Up to 512 Kbps │ │
│ │upstream │ │
├──────────┼────────────────────────────┼───────────────────────┤
│ADSL/R─ │1.5─8 Mbps │18,000 feet (12,000 │
│ADSL │downstream Up to │feet for fastest │
│ │1.544 Mbps │speeds) │
│ │upstream │ │
├──────────┼────────────────────────────┼───────────────────────┤
│IDSL │Up to 144 Kbps │18,000 feet │
│ │full duplex │(additional │
│ │ │equipment can extend │
│ │ │the distance) │
├──────────┼────────────────────────────┼───────────────────────┤
│HDSL │1.544 Mbps full │ 12,000─15,000 feet │
│ │duplex (T1) │ │
│ │2.048 Mbps full │ │
│ │duplex (E1) │ │
│ │(uses 2─3 wire pairs) │ │
├──────────┼────────────────────────────┼───────────────────────┤
│SDSL │1.544 Mbps full │10,000 feet │
│ │duplex (T1) │ │
│ │2.048 Mbps full │ │
│ │duplex (E1) │ │
│ │(uses 1 wire pair) │ │
├──────────┼────────────────────────────┼───────────────────────┤
│VDSL │13─52 Mbps │1,000─4,500 feet │
│ │Downstream │(depending on speed) │
│ │1.5─2.3 Mbps │ │
│ │upstream │ │
│ │(up to 34 Mbps if │ │
│ │symmetric) │ │
└──────────┴────────────────────────────┴───────────────────────┘
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