Research Results For 'Bandwidth'

ASYMMETRICAL

In telecommunications, asymmetrical means providing differing bandwidth in different directions. 56 K modems are asymmetrical: they offer a maximum speed of 56K for downloading, but only 28.8K or 33. 6K for uploading.
Research Asymmetrical

BANDWIDTH

In computing, bandwidth is the maximum load capacity of a data channel.
Research Bandwidth

DRAKE R7A

The Drake R7A was an American made general coverage communications receiver manufactured from 1981 to 1983 and provided coverage from 10 kHz to 30 Mhz in AM, SSB, CW and RTTY modes. The Drake R7A was an upgraded model of the earlier Drake R7, and added more bandwidth selectivity options.
Research Drake R7A

DRAKE R8A

The Drake R8A was an American made general coverage communications receiver manufactured from 1995 to 1998 as a replacement for the Drake R8 and provided coverage from 100 kHz to 30 Mhz in AM, SSB, CW, FM and RTTY modes with many ergonomic and performance improvements added including: alphanumeric memories, faster scanning, improved AGC, improved notch, improved display, easier mode and bandwidth selection, tilt-bar, enhanced tone control, detachable line cord and an expanded RS-232 command set.
Research Drake R8A

FINGER

Finger is a computer program that displays a particular user or all users logged on the system or a remote system. Typically it shows the full name, last login time, idle time, terminal line, and terminal location (where applicable). Because most Finger installations support redirection to another terminal, for example: $finger @systemtwo.com@systemone.com It can be used for denial of service attacks on network servers. The redirection serves both to hide the terminal originating the finger request, and can be used to generate repeated finger requests to a host computer, using up memory and bandwidth.

FOLDED DIPOLE

A folded dipole is a dipole aerial consisting of two conductors in parallel, only one of which is broken at the centre for connection to the feeder. This construction increases the bandwidth and the centre impedance of the aerial.
Research Folded dipole

PASSBAND TUNING

In radio terms, passband tuning is a circuit that allows the operator to move the selectivity bandwidth of the receiver above or below the frequency to which the radio is tuned. This is often helpful in reducing interference.
Research Passband Tuning

PROXY CACHE

A proxy cache is a computer cache system on a network, such as the Internet, often located near to a network gateway and used to reduce the bandwidth required over expensive dedicated internet connections. Proxy caches serve many users with cached files from many remote servers. Their primary usefullness is in caching files requested by one user for later retrieval by another. Some
proxy caches are part of cache hierarchies, in which a cache can ask neighboring caches for a requested file to reduce the need to fetch the file directly from it's source.
Research Proxy Cache

SELECTIVITY

In radio terms, selectivity is the ability of a radio to reject signals on frequencies adjacent to the desired station. It is usually expressed as a bandwidth measured at 6 dB rejection points ('6 dB down' or '-6 dB'). For example, a selectivity specification of '6 kHz at -6 dB' means any signal outside the 6 kHz bandwidth will be reduced in strength by at least 6 dB (in other words, the interfering signal is only one-fourth as strong as it would be otherwise). Typical good selectivity measurements at 6 dB points are 6 kHz for AM, 2.5 kHz for SSB, and 0.5 kHz for CW.
Research Selectivity

WEB CACHING

In computing, web caching is the temporary storage of files, such as HTML documents and images, by a computer for later retrieval. Web caching provides reduced bandwidth consumption, because there are fewer requests and responses transmitted over the network, reduced requests to the individual servers, and faster responses files as for cached requests are available immediately, and are closer to the user. Web caching takes various forms. The simplest is the cache often present in the software used by the user on their own computer for retrieving web pages, the web browser. Further along the network are proxy caches and on some servers server caches which reduce the number of requests made to the actual web server software program. Typically, most internet service providers (ISPs) utilise a proxy cache to greatly reduce the network traffic from their computers to the rest of the network. It has been reported that in some cases a proxy cache can issue as many as 80% of requested files.

In practise, if two or more users from an ISP, such as perhaps Comcast, both try to access the same web site during a short period of time, perhaps on the same day, the web site files will be transferred along the network to the ISP on the first request, taking a little time, but the second and subsequent users will be served the files straight from the ISP proxy cache, without the need to fetch the files again from the remote web site server.
Research Web Caching

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