Search results
Results from the WOW.Com Content Network
where s is the distance and c m is the speed of light in the medium (roughly 200,000 km/s for most fiber or electrical media, depending on their velocity factor). This approximately means an additional millisecond round-trip delay (RTT) per 100 km (or 62 miles) of distance between hosts. Other delays also occur in intermediate nodes.
Unlike single-owner networks, the Internet is a series of exchange points interconnecting private networks. [6] Hence the Internet's core is owned and managed by a number of different network service providers, not a single entity. Its behavior is much more unpredictable.
The name of this formula stems from the fact that is the twentieth formula discussed in Kuder and Richardson's seminal paper on test reliability. [1] It is a special case of Cronbach's α, computed for dichotomous scores. [2] [3] It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like ...
The on-test failure rates on a cable system are in the range of 0.2 to 4% for 30 min tests performed at the IEEE 400.2 voltage levels. IEEE Std. 400.2 provides suggested time and voltage test levels but exact parameters are not possible since defect growth rates are not known and can vary widely.
Fiber-optic communication remains the medium of choice for Internet backbone providers for several reasons. Fiber-optics allow for fast data speeds and large bandwidth, suffer relatively little attenuation — allowing them to cover long distances with few repeaters — and are immune to crosstalk and other forms of electromagnetic interference.
For premium support please call: 800-290-4726 more ways to reach us
This electrical signal is then outputted through coaxial cable to form a coaxial trunk. The optical portion of the network provides a large amount of flexibility. If there are not many fiber-optic cables to the node, wavelength division multiplexing can be used to combine multiple optical signals onto the same fiber. Optical filters are used to ...
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!