Because of the symmetric properties, the highest transmission rates can be supported in lengths up to 15,000 feet. This makes HDSL suitable mainly for campus like environments and localized service. ISDN ISDN networks transmit over copper wire at up to 128 Kbps. Because it is digital, it also supplies higher levels of speed and security than traditional phone lines. Satellite Transmissions are sent to an orbiting satellite and beamed down to an individual location.
Satellites allow fast transmission over immense distances with no loss of signal.
T1 T1 is a leased-line connection that functions at 1.544 Mbps. T1 is expensive but is one of the speediest methods available for connecting to the Internet, because of its bandwidth. There also is T3, which transmits at 4.5 Mbps. Drew Robb of Tujunga, Calif., writes about information technology.