10g Bit Error Rate
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Acceptable Bit Error Rate
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Bit Error Rate Measurement
question Anybody can answer The best answers are voted up and rise to the top How does BER compare between different 10GbE physical media? up vote 13 down vote favorite 2 I am under the impression that you should use optical for
Bit Error Rate Pdf
10GbE networking because of a BER (bit error rate) several orders of magnitude lower than copper. I'm pretty sure I previously found documentation stating so, but for the life of me I just cannot find it. I'd like to see documentation on typical BER (in general, if such a thing exists) for: 10GBase-T ports (with Cat6a cabling) 10GBase-CX4 ports 10GBase-T SFP+ modules (Cat6a cabling) Fiber SFP+ SR modules DAC SFP+ modules networking ethernet 10gbethernet sfp share|improve this question edited Aug 3 '12 at 15:36 asked bit error rate tester Aug 3 '12 at 14:47 MikeyB 29k565149 5 I think distance and cost requirements may factor into your decision matrix as well. –Mike Pennington Aug 3 '12 at 14:51 BER by itself is a meaningless metric when comparing technologies. It only has meaning when comparing the same product from different vendors. By the way: Copper SFP+ is misleading: These are eiter 10Gbase-T or Twinax (which is the same as DAC). –Tonny Aug 3 '12 at 15:03 Distance and cost requirements will factor into the overall decision, yes, but the purpose behind this question is to gain insight into the BER of various media. –MikeyB Aug 3 '12 at 15:37 BER is absolutely -not- meaningless. There is a two order of magnitude difference between twisted pair and twinax. This is why, for example, FCoE isn't supported on 10GBaseT yet. –rnxrx Aug 3 '12 at 19:36 Great! Can you please provide documentation? –MikeyB Aug 3 '12 at 19:47 | show 1 more comment 1 Answer 1 active oldest votes up vote 8 down vote Twinax is rated at 10^-17 at <= 10M Fiber is generally 10^-18 or better (lot of variables here, though - especially on long haul) Ethernet's minimum specification is 10^-12. This is where the contention comes in as far as FC goes - it may be that a TP infrastructure can support better than 10^-12 (and hopefully most do) but at 10G speeds even that much error translates to a
aspects of 10-Gigabit Ethernet such as market requirements, implementation structures, layer interfaces, coding techniques, frame formats, media, devices, and etc. See Also: Gigabit Ethernet| Gigabit Ethernet (Audio Recording bit error rate calculator of Lecture) | Gigabit Ethernet References| Books on Gigabit Ethernet| Optical Networking bit error rate tester software And Dense Wavelength Division Multiplexing (DWDM)| IP over DWDM Other Reports on Recent Advances in Networking Back to bit error rate testing Raj Jain's Home Page Table of Contents: 1. Introduction 2. 10-Gigabit Ethernet Overview 2.1 Benefits of 10-Gigabit Ethernet 2.2 Market Requirements 2.3 Protocol Layer 3. 10-Gigabit Ethernet MAC Layer http://serverfault.com/questions/414025/how-does-ber-compare-between-different-10gbe-physical-media 3.1 Full-Duplex Only 3.2 MAC Frame Format 3.3 Data Rate 3.4 Pacing Mechanism 4. 10-Gigabit Ethernet Physical Layer 4.1 10-Gigabit Media Independent Interface (10GMII) 4.2 Physical Layer Architecture 4.3 Coding Techniques 4.4 Lasers 4.5 Media 4.6 Distance 4.7 Bit Error Rate Summary References List of Acronyms IntroductionOver the past several years, Ethernet has been the most popular choice of technology http://www.cse.wustl.edu/~jain/cis788-99/ftp/10gbe/ for local area networks (LAN). There are millions of Ethernet users worldwide and still counting. In 1998, the standard for 1-Gigabit Ethernet was released. It prompted a great deal of attention from users, especially many of those who were reluctant to adopt the expensive ATM technology for their LANs. Within a few years, 1-Gigabit Ethernet is likely to dominate the LAN markets. As the demand for high-speed networks continues to grow, the need for a faster Ethernet technology is apparent. In March 1999, a working group was formed at IEEE 802.3 Higher Speed Study Group (HSSG) to develop a standard for 10-Gigabit Ethernet, which is expected to come out within the next few years. The preliminary objectives of the working group are listed below: [ Grow99] Support 10 Gb/s Ethernet with about 2-3 times the cost of 1-Gigabit Ethernet Maintain the IEEE 802.3 Ethernet frame formats. Meet IEEE 802 Functional Requirements. Simple forwarding between all speeds. Maintain compatibility to IEEE 802.3x flow. Maintain minimum and maximum frame size of current IEEE 802.3 standard. Specify media in
Custom Testing Pricing SUPPORT Customer Service FAQ Documentation Publications Videos Calculators Training Customer Service FAQ Documentation Publications Videos Calculators Training BER Confidence-level Calculator × Errors Found Close In the lab, we don't need https://www.jitterlabs.com/support/calculators/ber-confidence-level-calculator to know the true BER of our system. We simply need to measure enough data to have some confidence that the BER is lower than some specified level. The question then becomes, if we repeatedly transmit N bits, and detect E errors, what percentage of the tests will the measured BER (that is, E/N) be less than some specified BER (such as, BERS)? We call this percentage the BER bit error confidence level (CL × 100%), and calculate it using the Poisson distribution as follows. In other words, CL × 100 is the percent confidence that the system's true BER (i.e. if N = infinity) is less than the specified BER (e.g. BERS). That is, if the measurement is repeated an infinite number of times, the measured BER will be less (that is, better) than the specified BER for bit error rate CL × 100% of the tests. Since we cannot measure for an infinite length of time, the BER confidence level is always less than 100% (at least theoretically). Before starting a BER measurement, one must identify a target confidence level. Some industry standards specify this level (many do not), and 95% is a reasonable target. All industry standards specify a maximum system BER (what we call BERS here). Use the calculator below to determine the confidence level for a BER lab measurement by entering the specified BER, the data rate, the measurement time, and the number of detected errors. For reference, the number of transmitted bits (N) is shown as the data rate (BPS) multiplied by the measurement time (T). Alternatively, one can determine how many bits must be measured in the lab (that is, how much time is required to measure data) to achieve a specific confidence level, assuming a certain number of errors (usually, 0 errors) — simply enter BERS, BPS, and E, then change T until the desired confidence level is found. Enter numbers below as integers, or use scientific notation (for example, enter 123 as 123, 1.23e2, or 1.23E2). BER Confidence-level Calculator specified BER (BERS) Data rate in bi