High Error Rate Wireless
be challenged and removed. (March 2013) (Learn how and when to remove this template message) In digital transmission, the number of bit errors is the number of received bits of a data bit error rate calculation stream over a communication channel that have been altered due to noise, acceptable bit error rate interference, distortion or bit synchronization errors. The bit error rate (BER) is the number of bit errors per unit time. The bit error ratio (also BER) is the number of bit errors divided by the total number of transferred bits during a studied time interval. BER is a unitless performance measure, often expressed as a percentage.[1] The bit error probability pe is the expectation value of the bit error ratio. The bit error ratio can be considered as an approximate estimate of the bit error probability. This estimate is accurate for a long time interval and a high number of bit errors. Contents 1 Example 2 Packet error ratio 3 Factors affecting the BER 4 Analysis of the BER 5 Mathematical draft 6 Bit error rate test 6.1 Common types of BERT stress patterns 7 Bit error rate tester 8 See also 9 References 10 External links Example[edit] As an example, assume this transmitted bit sequence: 0 1 1 0 0 0 1 0 1 1 and the following received bit sequence: 0 0 1 0 1 0 1 0 0 1, The number of bit errors (the underlined bits) is, in this case, 3. The BER is 3 incorrect bits divided by 10 transferred bits, resulting in a BER of 0.3 or 30%. Packet error ratio[edit] The packet error ratio (PER) is the number of incorrectly received data packets divided by the total number of received packets. A packet is declared incorrect if at least one bit is erroneous. The expectation value of the PER is denoted packet error probability pp, which for a data packet length of N bits can be expressed as p p = 1 − ( 1 − p e ) N {\displaystyle p_{p}=1-(1-p_{e})^{N}} , assuming that the bit errors are independent of each other. For small bit error probab
IP isWhoisCalculatorTool PointsNewsNews tip?ForumsAll ForumsHot TopicsGalleryInfoHardwareAll FAQsSite FAQDSL FAQCable TechAboutcontactabout uscommunityISP FAQAdd ISPISP Ind. ForumsJoin Search similar:[Services] What is Yahoo doing to the Email now?CT Frontier (former AT&T) Email ProblemsYahoo email forced upgrade (again)[Southeast] ATT Security Breach..e-mail error with outbound.att.netHow to retain ameritech.net mail after DSL cancellation? Forums → Broadband and Networking → Wireless Networking → Solved: FYI- Too-strong signal = high error rate uniqs440 Share « problem with Gateway WGR-200 wireless broadband router • Will this be enough? » stevech0join:2006-09-17San Diego, CA1 edit stevech0 Member 2008-Aug-4 10:55 https://en.wikipedia.org/wiki/Bit_error_rate pm Solved: FYI- Too-strong signal = high error rateNeighbor called me over - can't login to email on AT&T's [crappy] Yahoo email site.After I wasted most of an hour trying to find why AT&T was just flopping back to the login page with no error notices, I found this really odd problem.The Laptop PC http://www.dslreports.com/forum/r20900542-Solved-FYI-Too-strong-signal-high-error-rate was on the same table as the AT&T DSL modem with integral WiFi. I ran a ping of the LAN gateway IP and got 30% errors. I increased the distance from the laptop to the DSL modem from 6 inches to about 2 ft. No more errors.AT&T/Yahoo login worked.Put laptop back close to modem: ping fails again.2-wire brand.Hmmm. · actions · 2008-Aug-4 10:55 pm · OTAEng@qwest.net OTAEng Anon 2008-Aug-4 11:14 pm All radio receivers can be overloaded by two strong an signal at the antenna. There are various ways to solve these problems. You have found the easiest solution for your HW. I have never encountered this problem with wireless gear. This is a first.FWIW - similar problems can also be encountered when attempting to increase transmitter power. There was a test of this done a few years ago using a Linksys wrt54g. There were even some pictures of how "crappy" the transmitted signal looked as output power was inc
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Formulae Manufacture Satellites Telecoms & networks Jobs RF Technology & Design BER Bit Error Rate Tutorial and Definition - bit error rate, BER is used to quantify a channel carrying data by counting the rate of errors in a data string. It is used in telecommunications, networks and radio systems. Bit Error Rate Tutorial Includes Bit error rate basics / tutorialBit error rate testing Bit error rate, BER is a key parameter that is used in assessing systems that transmit digital data from one location to another. Systems for which bit error rate, BER is applicable include radio data links as well as fibre optic data systems, Ethernet, or any system that transmits data over a network of some form where noise, interference, and phase jitter may cause degradation of the digital signal. Although there are some differences in the way these systems work and the way in which bit error rate is affected, the basics of bit error rate itself are still the same. When data is transmitted over a data link, there is a possibility of errors being introduced into the system. If errors are introduced into the data, then the integrity of the system may be compromised. As a result, it is necessary to assess the performance of the system, and bit error rate, BER, provides an ideal way in which this can be achieved. Unlike many other forms of assessment, bit error rate, BER assesses the full end to end performance of a system including the transmitter, receiver and the medium between the two. In this way, bit error rate, BER enables the actual performance of a system in operation to be tested, rather than testing the component parts and hoping that they will operate satisfactorily when in place. Bit error rate BER definition and basics As the name implies, a bit error rate is defined as the rate at which errors occur in a transmission system. This can be directly translated into the number of errors that occur in a string of a stated number o