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Topic: Bit error ratio

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	Bit error ratio - Wikipedia, the free encyclopedia
		In telecommunication, an error ratio is the ratio of the number of bits, elements, characters, or blocks incorrectly received to the total number of bits, elements, characters, or blocks sent during a specified time interval.
		For a given communication system, the bit error ratio will be affected by both the data transmission rate and the signal power margin.
		Examples of bit error ratio are (a) transmission BER, i.e.
	en.wikipedia.org /wiki/Bit_error_ratio (260 words)

	CommsDesign - A second look at jitter: Calculating bit error rates (Site not responding. Last check: 2007-09-11)
		Bit synchronization information is generally conveyed separately in the transmitter and receiver by the bit clock, which is a square wave signal that has a frequency (in Hz) equal to the data rate (in bits per second).
		When the bit is sampled exactly at the transition time or beyond (t £ tn-1 or t 3 tn), the probability of bit error is 50% (assuming 50% mark-density random data).
		Jitter can cause bit errors by shifting the bit sampling instant away from the optimum position and into regions of the bit time that are close to (or beyond) the bit transition points (at the rising and falling edges).
	www.commsdesign.com /showArticle.jhtml?articleID=12802039 (2988 words)

	Glossary of Electronic and Engineering Terms
		Bit Error Ratio (BER): The number of erroneous bits divided by the total number of bits transmitted, received or processed over some stipulated period.
		Note 2: The BER is usually expressed as a coefficient and power of 10; for example, 2.5 erroneous bits out of 100,000 bits transmitted would be 2.5 out of 105 or 2.5 x 10–5.
		Note: For n-ary operation, the bit rate is equal to log n times the rate (in bauds), where 2 n is the number of significant conditions in the signal.
	www.interfacebus.com /Engineering_Dictionary_2.html (636 words)

	ANSDIT - The letter "B"
		A two-dimensional array of bits indicating the presence or absence of an attribute.
		That part of the error control procedure used for determining that a data block is structured according to given rules.
		A string that consists of a number of bits, treated as a unit, and frequently representing a character or a part of a character.
	www.ncits.org /tc_home/k5htm/b2.htm (2561 words)

	HFTA-05.0: Statistical Confidence Levels for Estimating BER Probability - Maxim/Dallas
		Equation [3] gives the probability that k events (i.e., bit errors) occur in n trials (i.e., n bits transmitted), where p is the probability of event occurrence in a single trial (i.e., a bit error), and q is the probability that the event does not occur in a single trial (i.e., no bit error).
		In a typical confidence-level measurement, we start by choosing a satisfactory level of confidence and hypothesizing a value for p (the probability of bit error in transmitting a single bit).
		It is based on an assumption that the dominant cause of bit errors is thermal (Gaussian) noise at the input of the receiver.
	www.maxim-ic.com /appnotes.cfm/appnote_number/1095 (1834 words)

	Guidelines for OpenVMS Cluster Configurations
		The BER and availability of microwave radio portions of a DS3 link are affected by local weather and the length of the microwave portion of the link.
		BER (bit error ratio)--- " The BER is the ratio of the number of bits in error to the total number of bits transmitted during a measurement period, excluding all burst errored seconds (defined below) in the measurement period.
		During a burst errored second, neither the number of bit errors nor the number of bits is counted.
	www.cuis.edu /doc_vms_html/000000/731final/6318/6318pro_026.html (2178 words)

	Optical extinction ratio is dependent on noise and power (Site not responding. Last check: 2007-09-11)
		The ratio between the "one" level and the "zero" level, shown in Equation 3, is defined as the "extinction ratio," and is represented by the symbol re.
		This area and thus the bit-error ratio (BER) are determined by two factors: (1) the standard deviations of the noise (s0 and s1) and (2) the distance between vS0 and vS1.
		The conclusion of the discussion above is that the BER is determined by the standard deviation (RMS average) of the noise and the distance between the signal levels.
	www.commsdesign.com /printableArticle/?articleID=12802008 (1319 words)

	Computer, Telephony and Electronics Glossary and Dictionary
		BER is the ratio or bits with errors to the total number of bits detected, usually expressed as a number with an exponent to a power of 10.
		A bit is the smallest measure of data.
		The technique in T1 multiplexing in which the least significant bit (bit 8) of each byte in selected frames is "robbed" from being used to carry message information, and instead is used to carry signaling information.
	www.csgnetwork.com /glossaryb.html (7666 words)

	Loopback Bit Error Ratio Measurement Description (via CobWeb/3.1 planetlab2.cs.virginia.edu) (Site not responding. Last check: 2007-09-11)
		When the test set measures loopback bit error ratio, it sends a known data pattern (see DL DTCH Data) on the downlink dedicated traffic channel (DTCH) to a UE that is configured in loopback mode 1 or 2.
		However, the actual number of bits tested is always the largest multiple of the number of bits needed to fill a DTCH transport block for the transmitted format.
		When a CRC error occurs, the data within the block is not analyzed, and the number of Bits Tested is not incremented.
	wireless.agilent.com.cob-web.org:8888 /rfcomms/refdocs/wcdma/wcdma_meas_loopber_desc.php (1810 words)

	[No title] (Site not responding. Last check: 2007-09-11)
		By reserving resources, SDU error ratio performance is independent of the loading conditions, whereas without reserved resources, such as in Interactive and Background classes, SDU error ratio is used as target value.
		This attribute is used to decide whether error detection is needed and whether frames with detected errors shall be forwarded or not.
		In conjunction with the SDU error ratio attribute, care needs to be taken in deriving the value for the 95th percentile when an application desires, for example, that 99.9% of all transmitted packets are delivered within a certain time.
	www.faqs.org /ftp/internet-drafts/draft-jeong-nsis-3gpp-qosm-00.txt (4355 words)

	Look for jitter in a bathtub - 12/1/2003 - Test & Measurement World
		The eye diagram for your problematic design may resemble that for a functional system, because even good transceivers exhibit jitter—the trick is to ensure that resulting bit errors don't happen very often.
		BER, and you need to detect from 10 to 100 errors before you can have confidence in your measurement.
		The portion of the curve in the middle (approximately error free) and the steep curves rising at each end give clues as to why this graph has become known as a bathtub.
	www.reed-electronics.com /TMWORLD/article/CA341917.html (2020 words)

	Define BER - Bit Error Ratio
		Meaning of BER - "Bit Error Ratio", is the ratio of erroneous bits received as compared to the number of bits transmitted for some duration of time.
		BER = (error bits) / (total number of bits transmitted)
		"A measure of data integrity, expressed as the ratio of received bits that are in error, relative to the amount of bits received.
	www.birds-eye.net /definition/b/ber-bit_error_ratio.shtml (169 words)

	BERTScope 12.5 Gb/s Signal Integrity Analyzer :: SyntheSys Research
		With increased communications speeds comes the increasingly complex challenge of locating bit error events and quickly tracing their causes.
		Finally, bit error ratio detection can be performed quickly, accurately, and thoroughly.
		Seven types of advanced error analysis are built into one robust solution for unprecedented statistical measurement depth.
	www.synthesysresearch.com /Products/bscope.html (179 words)

	Embedded Papers - Beyond Bit Error Ratio - Gain New Insight from Studying Error Distributions
		Bit Error Ratio (BER) measurements are a standard figure of merit in high-speed digital systems.
		This paper will focus on a new field of bit error analysis that helps to provide insight more quickly, and in more detail, than has been generally available before.
		Conventional BER testers count the number of errors that occur.
	www.embeddedstar.com /technicalpapers/content/b/embedded1308.html (198 words)

	Bit Error Ratio Testers provide fast jitter measurement., Agilent Technologies, Inc
		Software, which requires user to select only desired bit error ratio and resolution accuracy, is included in firmware releases of ParBERT 81250 measurement suite and N4901B/02B Serial BERTs that test at rates to 13.5 and 12.5 Gbps respectively.
		The Fast TJ measurement is simple to make, requiring the user to select only the desired bit error ratio and the resolution accuracy.
		The ParBERT 81250 is Agilent's modular bit error ratio test solution for parallel and multiple serial computer and telecom high-speed communication ports up to 13.5 Gb/s.
	news.thomasnet.com /fullstory/464394/rss/2697 (936 words)

	networkZONE Technical Note: The Rules of Jitter Analysis (Stephens...Agilent Technologies...September 27, 2004) (Site not responding. Last check: 2007-09-11)
		We care about jitter for exactly the same reason that we care about signal-to-noise ratio: a low SNR means a high bit error ratio.
		Where signal-to-noise ratio describes the effect of voltage noise on a signal, jitter describes the effect of timing noise on a signal.
		The first rule of jitter analysis begs for a concrete way of describing jitter in terms of the bit error ratio (BER), we call it TJ (sorry about the acronyms, but these two are all you need for the moment).
	www.analogzone.com /nett0927.htm (285 words)

	The Ultimate PBER Dog Breeds Information Guide and Reference
		PBER is an Abbreviation for pseudo bit error ratio.
		In adaptive high-frequency (HF) radio, a bit error ratio derived by a majority decoder that processes redundant transmissions.
		Note: In adaptive HF radio automatic link establishment, PBER is determined by the extent of error correction, such as by using the fraction of non-unanimous votes in the 2-of-3 majority decoder.
	www.dogluvers.com /dog_breeds/PBER (95 words)

	math lessons - BER
		BER is a three letter abbreviation that can refer to the following:
		Basic Encoding Rules are a set of rules for encoding data that is described using the ASN.1 standard, for the purpose of transmission to a different computer system.
		Bit Error Ratio is the ratio between the number of incorrect bits transmitted to the total number of bits (E.800)
	www.mathdaily.com /lessons/BER (86 words)

	GL Communications - Ultra T1/E1 Analyzer (Site not responding. Last check: 2007-09-11)
		The ULTRA T1 (E1) can be used for routine testing of errors, such as bit errors, frame errors, and bipolar violation; signals, including received frequency, received signal level, and data bits; and timing including signal-loss seconds, test length etc. Alarm monitoring and time-stamped logging provide windows into the network performance.
		Round trip delay measurement is done by sending a BER pattern with the insertion of an errored bit and timing the reception of the errored bit.
		Bit error rate insertion has also been incorporated into the FPGA.
	www.gl.com /ultrat1.html (1754 words)

	Bit Error Ratio Tester offers jitter tolerance testing., Agilent Technologies, Inc.
		Unpredictable traffic can be analyzed with bit recovery mode, enabling realistic test scenarios.
		Agilent Technologies Inc. (NYSE: A) today announced the industry's first high-performance serial bit error ratio tester with advanced jitter generation capabilities for jitter-tolerance testing (J-BERT) of serial gigabit devices up to 12.5 Gb/s.
		Unpredictable traffic can be analyzed with the bit recovery mode, enabling more realistic test scenarios.
	news.thomasnet.com /fullstory/468854/3148 (862 words)

	BitAlyzer BA14400B 16-Channel BER Analysis System :: SyntheSys Research
		This system operates at up to 1000 Mb/s per channel on 16 channels, and is capable of supporting variable amplitude, offset, and logic threshold for both differential and single-ended I/O. The BA14400B features adjustable delay for each channel, and direct data clocking without the need for a phase lock loop for clock distribution.
		This powerful testing system consists of a separate data Generator and a Detector that also includes advanced Error Location Analysis™ features to help isolate bit error problems in parallel channel applications.
		Real-time histograms describing a device or channel's digital error characteristics are provided, based upon SyntheSys Research's patented Error Location Analysis™, which goes beyond merely counting errors to provide the operator with the tools required to find the source of errors, speeding up your development and troubleshooting.
	www.synthesysresearch.com /Products/ba14400b.html (213 words)

	ECS EPrints Service - Propagation and Bit Error Ratio Measurements for a Microcellular System
		An RSS Feed of this repository is available.
		EPrints is free software developed by the University of Southampton to facilitate Open Access to research.
		Chia, S. S., Steele, R., Green, E. and Baran, A. Propagation and Bit Error Ratio Measurements for a Microcellular System.
	eprints.ecs.soton.ac.uk /3669 (113 words)

	Tektronix: Products > Advanced Jitter, Noise, and BER Analysis Software for TDS/CSA8000 Series Sampling Oscilloscopes - ...
		Characterize Jitter, Noise and BER performance of high speed serial designs from 1 Gb/s to 60 Gb/s data rates.
		80SJNB is a comprehensive jitter, noise, and bit error ratio (BER) analysis application for serial data signal impairment characterization.
		When you combine Jitter, Noise, and BER analysis with the 8000 Series’ modular flexibility, uncompromised performance, and unmatched signal fidelity you get the ideal solution for next generation high-speed serial data design validation and compliance testing.
	www.tek.com /site/ps/0,,61-18868-INTRO_EN,00.html (422 words)

	Euro DesignCon 2005
		Total jitter (TJ) at a low probability level can be measured directly only on a bit-error ratio tester (BERT).
		Many engineers, however, resort to TJ techniques that are not BERT-based, mainly because of the prohibitively long measurement times required for a brute-force, high-resolution BERT scan.
		This presentation will describe an optimized technique based on probability and statistics theory that enables accurate TJ measurements at the 1e-12 bit-error ratio level in about 20 minutes at 10 Gbps.
	www.iec.org /events/2005/euro_designcon/conference/5-wp2-2.html (104 words)

	Compliance Test Suite targets PCI Express receivers Product News Network - Find Articles
		Parallel Bit Error Ratio Tester, Series 81250 offers automated tool for multi-lane PCI Express[R] receiver tolerance compliance and characterization testing.
		The enhanced measurement capability for the Agilent 81250 Series high-performance Parallel Bit Error Ratio Tester (ParBERT) makes it the first automated and the most accurate tool for multi-lane PCI Express receiver tolerance compliance and characterization testing.
		PCI Express' advanced technology, including a multi-lane architecture, spread spectrum clock, pre-emphasis/de-emphasis and its link layer protocol mechanism, is extremely difficult to test on traditional single channel measurement equipment.
	www.findarticles.com /p/articles/mi_m0PIL/is_2006_Feb_21/ai_n16072979 (645 words)

	PCIe tool delivers in-depth characterization testing
		Dishing up parallel BERT (bit-error-ratio tester) software that enables compliance and characterization testing for PCIe (PCI Express), Agilent Technologies Inc. announces this capability for its existing 81250 series ParBERT (parallel bit error ratio tester).
		The company claims this makes it the first automated tool for multi-lane PCIe receiver tolerance compliance and so-called deep-dive (in-depth) characterization testing.
		Your use of this website is subject to, and constitutes acknowledgement and acceptance of our
	www.eetasia.com /ART_8800406895_480300_30f35907.HTM?from=RSS (475 words)

	Aeroflex Incorporated: Products \| Communications Test \| Cellular Parametric Test \| 6113 GSM (EDGE) Base Station Test ...
		This is accomplished automatically without the need for user intervention.
		The A-bis interface also allows the user to make Bit Error Ratio measurements (BER) on the receiver and transmitter, as specified in GSM rec, 11-20/11-21.
		The 6113 A-bis interface also permits a wide variety of other test functions to be performed that could not otherwise be implemented.
	www.aeroflex.com /products/commtest/cellparametric/6113gsm.cfm (360 words)

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