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Glossary 17
X
X2 technology
A technology developed by U.S. Robotics (now 3Com) for delivering data rates up
to 56 Kbps over plain old telephone service (POTS). It was long believed that the
maximum data transmission rate over copper telephone wires was 33.6 Kbps, but
X2 achieves higher rates by taking advantage of the fact that most phone switching
stations are connected by high-speed digital lines. X2 bypasses the normal digital-
to-analog conversion and sends the digital data over the telephone wires directly to
a modem where it is decoded.
Содержание POWERMATE 8100 Series
Страница 17: ...1 System Overview Configurations Features Components ...
Страница 131: ...4 System Board Connectors Jumpers and Sockets Components Pin Assignments Resources ...
Страница 183: ...6 Illustrated Parts Breakdown Parts and Options Field Replaceable Unit FRU List Illustrated Parts Breakdown IPB ...
Страница 189: ...7 Preventive Maintenance System Cleaning Keyboard Cleaning Mouse Cleaning ...
Страница 193: ...8 Troubleshooting Checklist Diagnostics ...
Страница 204: ...9 NEC CSD Information Services Service Telephone Numbers Technical Support Product Information FaxFlash Service ...