The lower this figure the better, and the better chance you have of getting the faster speeds. Attenuation. Things improve marginally but it looks like I'm out of luck for 50mbit. Tableau de comparaison; Définition; Différences Clés ; Conclusion; Tableau de comparaison. I'm talking about things like Line Attenuation and Output Power. Over the last 12 months my line attenuation is slowly increasing. Basically it's the distance between you and the ISP and the quality of the copper to your house. un peu … Les stats remontés sont : Line Mode: G.993.2 (VDSL2) Profile: 17a; Line Attenuation (LATN): 31.6 dB / 40.7 dB; Signal Attenuation (SATN): 26.4 dB / 40.0 dB; Noise Margin (SNR): 6.1 dB / 5.1 dB; Même si entre les atténuations estimées et le réel, il y a toujours une différence significative, je constate quand mê This document is very specific to VDSL service, though you can have either ADSL or VDSL service on the above mentioned routers and modules. The further you are away from the exchange the higher your attenuation figure will be as the signal loss increases. They are (line attenuation): Download: 18.1, 49.3, 76.2 DB Upload: 4.2, 40.6, 58.2 DB Noise margin: Upload: 6.1 DB Download: 6.2 DB I found an attenuation to sync speed calculator for VDSL2, but due to my 3 figures for upload/download, I can’t work out how/where to put all these numbers in, to calculate the sync speed based on these attenuation figures. What I wanted was a simple chart so I could see if the signal to noise ratio and line attenuation values that my modem was reporting were good or bad. What is the theoretical db/Km at what frequency for new cable as I cant find it published anywhere. Les valeurs d'atténuation en Vdsl2 sont plus élevées qu'en Adsl et dépendent des fréquences utilisées. I had been having line problems on ADSL, and have recently switched to 20MB VDSL, but it seems even less stable now. is Line Attenuation. Needless to say green is good and red is bad. When referring to a band in the downstream direction, it is the measured difference in the total power transmitted by the xTU-C and the total power received by the xTU-R over all subcarriers of that band during initialization. VDSL2 est l'acronyme de Very high speed Digital Subscriber Line 2. Comme son nom l'indique, le VDSL2 est le successeur du VDSL, un protocole de transmission qui booste les débits Internet sur les réseaux de paires de cuivre. Les débits asymétriques du VDSL 2 subissent des contraintes physiques identiques à celles du VDSL. Forum discussion: I would like to know a series of good VDSL line statistics. I guess attenuation is significantly different for ADSL and VDSL. Here are my stats from my new VDSL … Theoritical estimate based on line attenuation of 25.7 dB/Km (assuming the thickness of copper wire is 26 AWG (American Wire Gauge) or 0.405 milimetre diameter) -----This seems a low figure (Maybe its old VDSL) My NBN VDSL2 Profile 17a has a max bandwith of about 17MHz. Non, 26.4 dB d'atténuation en Vdsl2, ce n'est pas énorme. Measure of how much the signal has degraded between the DSLAM and the modem. It also depends on the amount of users, who connect through the same copper. Lors de la souscription de mon VDSL, parmi le 5 premiers dans l'immeuble, j'avais ~75-77Mbps (en effet 78 Mbps pendant 2 semaines jusqu'a l'arivee de ma deuxieme line VDSL - la premiere chute du debit de synchro). The lower the dB the better for this measurement. Attenuation is a term used to describe the reduction of the adsl signal strength that occurs on the copper pair over distance and is measured in dB decibels. Line Attenuation(dB): 29.1 90.3 102.3 13.7 N/A N/A N/A Signal Attenuation(dB): 29.1 N/A N/A 13.7 N/A N/A N/A Noise Margin(dB): 6.3 N/A N/A 7.1 N/A N/A N/A 20dB and below is outstanding; 20dB-30dB is excellent; 30dB-40dB is very good; 40dB-50dB is good; 50dB-60dB is poor and may experience connectivity issues; 60dB or above is bad … Le VDSL2 (de l'anglais Very-high-bit-rate digital subscriber line 2) est un protocole de transmission de données à haut débit vers un abonné à travers une paire de fils de cuivre.VDSL2 est le successeur du VDSL.Parmi les améliorations notables, le débit maximal théorique passe de 34 à 100 Mbit/s en full-duplex, et la distance entre l'utilisateur et le DSLAM est portée à 3 500 mètres. Line attention is in relation to the "loop loss" on your line. J'ai actuellement un BT Home Hub 5A avec un OpenWrt 18 pour mon accès VDSL. il est clair qu'avec une marge au bruit de 3 dB, ce n'est vraiment pas bon surtout que tu as une erreur CRC, et comme annoncé par @JuanLucas38, le VDSL demande une desserte domestique parfaite . Any tech guys have a good answer ? Very High Bitrate Digital Subscriber Line (VDSL) technology is similar to ADSL with some enhancements. Line attenuation (donc l'atténuation descendante) : 16,1 dB . We believe that BT may choose not to implement the wider profile. Mais l'Arcep se montre prudente : selon l'Autorité, le débit réel observé serait plutôt de 80 mégabits par seconde. Le VDSL 2 permettrait d'obtenir en théorie un débit descendant de 100 mégabits par seconde. Elle devient intéressante par rapport à la technologie ADSL2+, sur une distance inférieure à 1 km (1 000 mètres) du central téléphonique, ou noeud de raccordement abonnés (NRA). To operate successfully, VDSL equipment must overcome line attenuation, crosstalk, radio-frequency (RF) ingress and other interferences. Line Attenuation. Line Attenuation. So here are my demarc line stats. It is IMPOSSIBLE to determine DSL sync speeds based on line of sight distance or street distance to your Node. It explains how to troubleshoot VDSL related issues on the Cisco 880 Series, 890 Series, 860 Series, and VDSL/ Asynchronous Digital Subscriber Line (ADSL) Enhanced High Speed WAN interface cards (EHWICs). Line attenuation is in relation to the "loop loss" on your line. As I couldn’t find such a chart anywhere I made one. Dans le cas d’un accès ADSL (Asymmetric Digital Subscriber Line), les débits proposés sont: • Un débit descendant en général de 1Mbit/s à 15Mbit/s. On 20cn ADSL, with no planned date of any upgrade to 21cn it look the... To use it look up the values on your line line ( VDSL ) is... 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