Bit error ratio is a unitless performance measure, often expressed as a percentage. 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. Try testing a few more cables of varying lengths to get a feel for the tester. This is should be rounded up to 10 -7 BER and there's definitely an issue on your cable. If we assume you have a single bit error (best case) per packet, you have 4830 bit errors / (1000000 packets x 1518bytes x 8bits) = 3.16x10 -7. To convert percent to scientific notation: 0.483% = 0.00483 = 4.83 × 10 -3 which is between 10 -3 and 10 -4 (a calculator in scientific mode can convert and show you scientific notation). This device technically can't measure true BER as number of bit errors per total bits because it only counts packets - it's still great for detecting errors. Packets with errors are because one or more bits are altered and this measurement is the packet error ratio PER. ![]() The Pocketethernet device counts the number of 1518byte packets with errors by checking the packet for CRC errors. Certified cables are guaranteed to work in all specified scenarios. ![]() It's not enough to try-and-error because you might want to run other protocols on your cables later on - a Cat-5e DIY cable that's running 1000BASE-T fine might give up on 2.5GBASE-T since that uses a larger frequency envelope. It doesn't measure attenuation over the frequency range, the crosstalk varieties or the various other parameters. Effectively, that Pockethernet tester of yours can only measure the error rate for a certain protocol. However: if you fabricate your own cables you need to use a tester than can certify the cable ($1000+). The 4.83×10 -3 frame error rate you've measured is very high - depending on the exact purpose of that cable you'd have to decide whether you can live with it or not. If using a 120Hz monitor, then 120fps is automatically added to this test (30fps vs 60fps vs 120fps) in supported browsers. This screen compares multiple framerates. That's worst case, within specs - with decent, not maxed-out cabling, you're usually quite a bit better, like 10 -9 or so. Welcome to Blur Busters UFO Motion Tests. additional conversion options like Encoder settings, frame rate, video resize, or video effects. A maximum sized, untagged Ethernet frame requires 1526 bytes or 12,208 bits on the wire, so a BER of 10 -12 roughly translates to a frame error ratio of 1.2×10 -7. Want to convert MKV to MP4 quickly and free of cost. In term of packets/frames, it depends on their average size. Early variants only had 10 -10 or better, see IEEE 802.3 for details. ![]() Most modern Ethernet variants are designed for a bit error ratio (BER) of 10 -12 or better.
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