 - V.90 is a A Tour of the Internet, Who Runs It, Standards Org, approved by the International Telecommunications Union (ITU-TS), for transmitting data downstream to modems at 56 Kbps (thousand bits per second). The V.90 standard was arrived at by combining the x2 technology from US Robotics (now part of 3Com) and the K56flex technology from Rockwell. Transmission upstream from a computer modem is slower than downstream (about 33 Kbps) since it requires digital-to-analog conversion.
56 Kbps transmission technologies exploit the fact that most telephone company offices are interconnected with digital lines. Assuming your Internet connection provider has a digital connection to its telephone company office, the downstream traffic from your local Internet access provider can use a new transmission technique on your regular twisted pair phone line that bypasses the usual digital-to-analog conversion. A V.90 modem doesn't need to demodulate the downstream data. Instead, it decodes a stream of multi-bit voltage pulses generated as though the line was equipped for digital information. (Upstream data still requires digital-to-analog modulation.)
Unlike Integrated Services Digital Network, the 56 Kbps technologies do not require any additional installation or extra charges from your local phone company. On the other hand, the maximum transmission speed of ISDN is twice that of V.90 at 128 Kbps. You also have the flexibility of combining digital and voice transmission on the same line.
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Learn more about Working With Servers and Desktops |
| Troubleshooting -- 'Network Know-How' Chapter 17: Troubleshooting, Chapter 17 of 'Network Know-How,' shows tools and methods that identify and solve network problems. Use this chapter as a tutorial to fixing computer connections. |
| Network navigation -- Chapter 6 of 'Microsoft Windows Vista Administration': Microsoft introduced a new way to view and navigate a network with Windows Vista. This chapter examines new network navigation tools and managing network connections with Vista. |
| Network administration guide: Network administration responsibilities, such as network design, troubleshooting, backup, documentation, security, and managing users are discussed in this guide. |
| Network administration: Help for designing, managing and troubleshooting your network: Helpful tips for network administration design, management and troubleshooting are presented in this guide. |
| Top five administrator tips of '05: This collection of our top five administrator tips focus on strategies for maximizing network uptime and efficiency while minimizing security risks and vulnerability. |
| LAST UPDATED: |
16 Oct 2006
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