To: Bernard Levy who wrote (4099 ) 6/9/1999 11:13:00 AM From: Darren DeNunzio Read Replies (1) | Respond to 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) │ │ └──────────┴────────────────────────────┴───────────────────────┘