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Topic: Latency vs Bandwidth

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Bandwidth

	Comparison of latency and bandwidth - Wikipedia, the free encyclopedia
		Latency and bandwidth together determine the "speed" of a connection, and the "speed" of a connection can vary widely depending on your needs.
		Latency is fairly low (typically about a quarter of a second) and the size of an average web page (around 30–100 kilobytes) will transfer in 10–30 seconds.
		Although the bandwidth of a satellite connection can be very high and very economical, the latency added by the round trip through the satellite (1–2 seconds) makes low-latency Internet tasks such as network gaming a very bad experience.
	en.wikipedia.org /wiki/Latency_vs_Bandwidth (662 words)

	Bandwidth (Site not responding. Last check: 2007-10-16)
		Bandwidth is the width, usually measured in Hertz, of a frequencyband f2 - f1.
		The bandwidth of an electronic filter is thepart of the filter's frequency response that lies within 3 dB compared to the center frequency of its peak.
		Bandwidth isnormally based on the frequencies used and the spectral spread of the informationcaried on the frequency.
	www.therfcc.org /bandwidth-2000.html (167 words)

	Bandwidth
		Bandwidth is the width, usually measured in Hertz, of a frequency band f2 - f1.
		Bandwidth is related to the amount of information that can flow through a channel through the Nyquist-Shannon sampling theorem.
		Bandwidth is normally based on the frequencies used and the spectral spread of the information carried on the frequency.
	www.brainyencyclopedia.com /encyclopedia/b/ba/bandwidth.html (212 words)

	Bandwidth - Wikipedia, the free encyclopedia
		For analog signals, which can be mathematically viewed as a function of time, bandwidth is the width, measured in hertz, of a frequency range in which the signal's Fourier transform is nonzero.
		The bandwidth of an electronic filter is the part of the filter's frequency response that lies within 3 dB compared to the center frequency of its peak.
		In such cases, bandwidth is usually measured in bits or bytes per second.
	en.wikipedia.org /wiki/Bandwidth (643 words)

	Comparison of latency and bandwidth - Wikipedia, the free encyclopedia
		Bandwidth: how much information can be transferred over a connection in a given period of time.
		Latency is fairly low (typically about a quarter of a second) and the size of an average web page (around 30-100 kilobytes) will transfer in less than 10 seconds.
		Although the bandwidth of a satellite connection can be very high and very economical, the latency added by the round trip through the satellite (1-2 seconds) makes low-latency Internet tasks such as network gaming a very bad experience.
	www.encyclopedia-online.info /Comparison_of_latency_and_bandwidth (595 words)

	latency vs bandwidth (Site not responding. Last check: 2007-10-16)
		Bandwidth : how much information can be transferred over a connection in a given period of time.
		Latency is low (typically far less than a second) and the size of an average web page (around 30-100 kilobytes) will transfer in 5-10 seconds or so.
		The postal service has a latency of about 3 days in most cases, but the bandwidth that can be put into a box (in the form of DVD disks) is incredible.
	www.yourencyclopedia.net /Latency_vs_Bandwidth.html (600 words)

	Bandwidth - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-16)
		Bandwidth is the width, usually measured in hertz, of a frequency band f
		By extension from the above, the word bandwidth is also used to mean the amount of data that can be transferred through a digital connection in a given time period (i.e., the connection's bit rate).
		All of these decisions involve an understanding of bandwidth, which is a measure of...
	encyclopedia.worldsearch.com /bandwidth.htm (594 words)

	Latency vs Bandwidth (Site not responding. Last check: 2007-10-16)
		Bandwidth : how much information can be transferred over a connection in agiven period of time.
		Latency and bandwidth together determine the "speed" of a connection, and the "speed" of a connection can vary widelydepending on your needs.
		Latency is fairly low (typically about a quarter of a second) and the size of an average web page (around30-100 kilobytes) will transfer in 5-10 seconds or so.
	www.therfcc.org /latency-vs-bandwidth-42634.html (548 words)

	Latency & Bandwidth (Site not responding. Last check: 2007-10-16)
		Bandwidth can be described as a pipe with a fixed diameter and application data can be thought of as a bucket of water.
		Latency is sometimes described as the amount of "time to send a message of zero bytes".
		The latency delay of a 1 Gbps link is the same as a 1 Mbps line because both are constrained by the speed-of-light.
	mywebpages.comcast.net /sdeclerck/Latency/latency.html (3667 words)

	Cable vs. DSL: Latency (Site not responding. Last check: 2007-10-16)
		Latency is how long it takes a packet to make a round trip on the network (in simplistic terms, a packet is something that carries data across a network).
		Bandwidth is the size of the network connection.
		For me, high latency causes severe productivity problems because when I am connected to a remote server writing code (which is frequently), and I type a character, the character may not appear on the screen for a few seconds.
	www.jamesthornton.com /writing/cable-vs-dsl-latency.html (567 words)

	X Window System Network Performance (Site not responding. Last check: 2007-10-16)
		For this study, one goal was to measure the performance impact of latency vs. bandwidth, and so a set of latency and bandwidth values were used and each test run with every pair of latency and bandwidth.
		These latencies represent the time for a packet to traverse through the router in one direction, and so a round trip time would be at least twice that value.
		Bandwidth usage for client side fonts is about the same as with server side fonts, as expected, even with the glyphs uncompressed.
	www.freedesktop.org /~keithp/talks/usenix2003/html/net.html (5876 words)

	Ars Technica: Understanding Bandwidth and Latency - Page 1 - (11/2002) (Site not responding. Last check: 2007-10-16)
		From the bygone debates over DDR vs. RDRAM to the current controversy over Apple's DDR implementations, one issue is commonly misunderstood in most discussions of memory technology: the nature of the relationship between bandwidth and latency.
		In this view bandwidth is seen as an intrinsic, fixed property of the transmitting medium itself, a number that's unaffected by the vagaries of the transmitters at either end of the medium.
		The peak bandwidth of a bus is the most easily calculated, the largest (read: the most marketing friendly), and the least relevant bandwidth number that you can use to quantify the amount of data that two components (i.e.
	arstechnica.com /paedia/b/bandwidth-latency/bandwidth-latency-1.html (1151 words)

	Troubleshooting Q&A - June 15, 2005 (Site not responding. Last check: 2007-10-16)
		A few people suggested that I might not have enough upstream bandwidth, but when I checked my throughput rates using the speed test at DSL Reports, it came back with a rating of 344 Kbps on the upstream and 747 kbps on the downstream.
		Bandwidth is normally expressed in bits per second and refers to the total amount of data that can be transferred within one second.
		Latency is a byproduct of the electrical characteristics of the circuit, and it's also affected by routing that an ISP sets (i.e., if your data packet has to travel further, latency increases).
	www.practicallynetworked.com /qa/qa20050615.shtml (1209 words)

	LostCircuits, Memory Reviews
		We have evaluated the impact of DRAM latency and memory bus frequency on bandwidth and gaming performance in a step by step performance evaluation from 100 to 166 MHz memory bus frequency with varying latency settings.
		A twist of this situation is that Rambus is not an interface that is friendly to overclockers, on the other hand, the standard SDRAM interface has evolved to a degree where system bus frequencies in excess of 150 MHz are no longer impossible.
		This is of utmost importance, since otherwise the clock speed delta would mask the change in performance caused by the parameters we are actually interested in: bandwidth and latency.
	www.lostcircuits.com /memory/latency (674 words)

	Bona Fide Reviews - Memory Bandwidth vs. Latency Timings Article
		Memory Bandwidth vs. Latency Timings All memory is not created equal, nowadays you need to know which 'flavor' is best for an Intel or AMD PC if you expect the best performance back from your investment.
		Having a large pool of bandwidth is great when you're working with applications that process a lot of raw data, such as Photoshop or databases for example.
		While bandwidth is still very important to the Intel Pentium 4, it's not as important as it once was in the i845PE days of single channel memory controllers.
	www.bonafidereviews.com /article.php?id=45 (1423 words)

	Latency vs Ping
		The way Half-Life determines the "latency" value shown in its scoreboard is different than what users generally call "ping".
		The word latency is a deliberate decision to emphasize that the value shown is a better representation of actual network play than a mere ping.
		So the road to better latency values involves trying to improve your framerate as much as possible, as well as playing on servers that are running at decent ticrates.
	www.bluesnews.com /articles/latency_vs_ping.shtml (882 words)

	InfoStor - Bandwidth vs. latency in SAN extensions
		Latency is simply "delay." In this context, it is the delay that a signal receives when traveling from the initiator (in the primary data center) to the target (at the mirror site).
		The total time has two components: latency (while waiting for the request to travel to the target and waiting for the first byte of data to travel back) and the transmission time (total amount of data divided by the link bandwidth).
		If the latency is small (it is essentially zero in the data center), the throughput is approximately equal to the bandwidth.
	www.infostor.com /Articles/Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=129149 (1887 words)

	Bandwidth vs Distance Latency (Site not responding. Last check: 2007-10-16)
		The difference between these two types of latency is the size of the packets and the ability for the transport protocol to send burst of packets.
		Distance latency is the amount of time to propagate the signal from one point to another.
		Increasing bandwidth is a cost that must be paid every month, whereas a network application that is written with WAN circuits in mind is a one time cost that results in monthly savings.
	www.pmg.com /tip_archive/July98.htm (405 words)

	[No title] (Site not responding. Last check: 2007-10-16)
		Latency := the delay from when the processor first request an nformation from the memory until the information arrives and is available to be used by the processor.
		Bandwidth:= The rate at which iformation can be transferred from the memory system.
		Memory hierarchy attempts to bring the average latency down by using a smaller but faster memory (memory with less latency) closer to the CPU.
	web.engr.oregonstate.edu /~sllu/memory/lec3.html (248 words)

	DigitalWeb Internet Services
		The combination of latency and bandwidth give users the perception of how quickly a webpage loads or a file is transferred.
		The pressure is latency, the width of the pipe is bandwidth.
		Latency is the function of the electrical characteristics of the circuit.
	www.digitalweb.net /faq.shtml (2164 words)

	Bandwidth (Site not responding. Last check: 2007-10-16)
		Its "three strikes and you're out" policy means that bandwidth hogs will receive three warnings if they are found to be abusing the service.
		Encrypted P2P networks will soon make bandwidth management based on deep packet inspection obsolete, says Staselog, a Finnish appliance outfit.
		Bandwidth is normally based on the frequencies used and the spectral spread of the information caried on the frequency.
	www.wikiverse.org /bandwidth (281 words)

	Memory Bandwidth vs. Latency Timings - PCStats.com
		With a DDR memory controller now capable of running dual channel, the Pentium 4 was no longer to be bandwidth limited as it had been with the i845 series.
		When one talks about memory timings they're basically talking about how long the system has to wait for the memory to be in a ready state before data is fetched or delivered.
		CAS latency is the delay between the registration of a read command and the availability of the first piece of output data.
	www.pcstats.com /articleview.cfm?articleID=873 (872 words)

	SAGE ;login: - bandwidth versus latency
		We should use that bandwidth, however, to accommodate multiple simultaneous sessions (from multiple users, from multitasking individuals, or from some combination of both), rather than counting on it to provide adequate performance for any individual session.
		Each office should have more bandwidth available in a few months when [something confidential] happens, but they'll still have backup connectivity that's limited to 128 kb/s (either their current frame relay service, or dial-on-demand ISDN service).
		As for latency, 100 ms one-way is about what we can expect out of our coast-to-coast frame relaybased IP WAN during peak usage periods each day.
	www.usenix.org /publications/login/1999-4/bandwidth.html (562 words)

	Techworld.com
		If you don't quite have enough bandwidth, you can queue stuff up and chances are most of it'll get through eventually--by which time half your apps will have timed out and you'd have been better just dropping the packets anyway.
		Latency will kill any time-sensitive app--thats especially true for voice and real-time video, but a lot of data apps don't like it either.
		Latency has an increasingly negative effect when you move from a small number of large packets to a large number of small packets.
	www.techworld.com /forums/msgs.cfm?msg=871&forum=99 (692 words)

	[blog.forret.com]: It's the latency, stupid! (Site not responding. Last check: 2007-10-16)
		This blog covers stuff like great movies, house music, tango moves, Blogger podcasting, spam detection, digital cinema, bandwidth issues, copyright laws and funky drummers.
		While working on some bandwidth-related stuff (my bandwidth calculator), I came across an excellent article on "latency vs. bandwidth" by Stuart Cheshire.
		Latency, a synonym for delay, is an expression of how much time it takes for a packet of data to get from one designated point to another
	blog.forret.com /blog/2004/11/its-latency-stupid.html (315 words)

	It's the Latency, Stupid
		What most end-users don't know is that in the process of transferring those big files their computers have to send back and forth hundreds of little control messages, so the performance of small data packets directly affects the performance of everything else they do on the network.
		Bandwidth is important not only for it's own sake, but also for it's effect on overall latency.
		"Network latency in and of itself is not material to game playing; at least 70 to 90 percent of latency problems we see are due to the end points: the modems," he says.
	www.stuartcheshire.org /rants/Latency.html (5122 words)

	[H]ard\|OCP - BEYOND DDR?
		Reducing latencies by means of faster strobes is technically difficult and economically not viable, particularly if the bus speed is increased to approach 200 MHz.
		Between 1994 and 1997, the discrepancy between the memory bus frequency and the clock speed of the processor was about 3 times with internal clock multipliers of 3 or 3.5 depending on the CPU speed grade.
		Consequently, even if the maximum bandwidth achievable (peak bandwidth) by Rambus PC800 memory is 50% higher than the peak bandwidth of PC133 SDRAM, the average bandwidth under real life conditions is substantially less since random access-related latency becomes the main limiting factor.
	www.hardocp.com /article.html?art=MjM4 (1755 words)

	TidBITS#367/24-Feb-97
		The bandwidth of a modem connection provides high enough fidelity that voice (such as a newscast) sounds fine and music (such as a concert broadcast) is passable.
		Latency is the same thing as seek time: the minimum time between asking for a piece of data and getting it, just like the seek time of a disk, and it's just as important.
		Improving Latency -- One thing to notice is that the 38.4 Kbps serial connection between the computer and the modem, which many people don't think of as being the bottleneck, turns out to be responsible for 52 ms of the delay.
	www.tidbits.com /tb-issues/TidBITS-367.html (4355 words)

	Bandwidth - free-definition (Site not responding. Last check: 2007-10-16)
		In signal processing and control theory, the bandwidth is the frequency at which the closed-loop system gain drops to -3 dB.
		The maximum digital bandwidth for a given analog channel is determined by the Shannon-Hartley theorem.
		Typical digital communications now come close to the entire possible bandwidth.
	www.free-definition.com /Bandwidth.html (299 words)

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