The lower the dB the better for this measurement. Over the last 12 months my line attenuation is slowly increasing. 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). DSL signifie Digital Subscriber Line (ligne d'abonné numérique), qui transforme une ligne téléphonique ordinaire en une liaison de communication à large bande. Line Attenuation. Line Attenuation(dB): 27.7 89.4 102.3 8.9 68.6 64.7 N/A Signal Attenuation(dB): 27.7 N/A N/A 8.9 0.0 0.0 N/A Noise Margin(dB): 6.3 N/A N/A 5.4 N/A N/A N/A . VDSL Port Details Upstream Downstream Attainable Net Data Rate: 11920 kbps 53628 kbps Actual Aggregate Tx Power: 6.8 dBm 12.1 dBm ===== VDSL Band Status U0 U1 U2 U3 D1 D2 D3 Line Attenuation(dB): 5.8 30.8 46.4 N/A 14.5 38.3 59.5 I already have decent specifications for SNR so I … Les débits asymétriques du VDSL 2 subissent des contraintes physiques identiques à celles du VDSL. Tableau de comparaison; Définition; Différences Clés ; Conclusion; Tableau de comparaison. Line attenuation is in relation to the "loop loss" on your line. The closer you are to the ISP, typically the better speeds you can get. 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 … Please note that these are typical values and can often be affected by the particular conditions on your line, ... Firstly, adoption of the 30a VDSL2 profile (using a wide 30 MHz bandwidth) could deliver maximum speeds well above 100 Mbps, although this would mainly benefit premises located close to the street cabinet. Line attenuation. J'ai actuellement un BT Home Hub 5A avec un OpenWrt 18 pour mon accès VDSL. La technologie VDSL2 Very high speed Digital Subscriber Line 2) est un protocole de transmission de données sur une paire de cuivre, c'est à dire sur la boucle locale de France Télécom/Orange. • Un débit montant en général inférieur à 1Mbit/s. A large part of what matters is the cable length, which your VDSL provider may or may not be able to provide. There are three layers in which the failure … 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. Attenuation. un peu … Any tech guys have a good answer ? This document is very specific to VDSL service, though you can have either ADSL or VDSL service on the above mentioned routers and modules. It also depends on the amount of users, who connect through the same copper. 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. Line 0: XTU-R (DS) XTU-C (US) Trellis: ON ON SRA: disabled disabled SRA count: 0 0 Bit swap: enabled enabled Bit swap count: 10 0 Line Attenuation: 9.3 dB 0.0 dB Signal Attenuation: 0.0 dB 0.0 dB Noise Margin: 44.7 dB 46.4 dB Attainable Rate: 109103 kbits/s 56616 kbits/s Actual Power: 12.0 dBm 6.6 dBm Per Band Status: D1 D2 D3 U0 U1 U2 U3 The modulation method used in VDSL is DMT (Discrete Multitone Technique), which is the combination of QAM and FDM. 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. 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. 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). Cordialement, mg36 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). Forum discussion: I would like to know a series of good VDSL line statistics. Loop Att. 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 . It is IMPOSSIBLE to determine DSL sync speeds based on line of sight distance or street distance to your Node. Of particular importance is operation on existing unshielded twisted-pair lines. To operate successfully, VDSL equipment must overcome line attenuation, crosstalk, radio-frequency (RF) ingress and other interferences. Mais l'Arcep se montre prudente : selon l'Autorité, le débit réel observé serait plutôt de 80 mégabits par seconde. Κατηγορίες Τεχνολογία Ετικέτες ADSL, Line attenuation, Line noise, SNR margin, VDSL, VDSL2, Θόρυβος γραμμής Πλοήγηση άρθρων Προηγούμενο άρθρο Προηγούμενη Τι είναι στο σύμβολο σταυρός συν + με κύκλο στο κινητό σας Things improve marginally but it looks like I'm out of luck for 50mbit. It uses coaxial, fibre optic or twisted pair cable for short distances up to 4500 feet. Hi there! 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 VDSL offers higher capacity than ADSL on short lines. Le VDSL 2 permettrait d'obtenir en théorie un débit descendant de 100 mégabits par seconde. It's also measured in dBs and you can check the number on your ADSL statistics page. Les valeurs d'atténuation en Vdsl2 sont plus élevées qu'en Adsl et dépendent des fréquences utilisées. Here are my stats from my new VDSL … Needless to say green is good and red is bad. As I couldn’t find such a chart anywhere I made one. Line Attenuation. VDSL then installed with master splitter and line attenuation was then measured to be 22db with speed of around 18mb/s (seems to be inline with the distance from the local exchange) - after 2 months of use and latency spikes and chatting to a few knowledge people here, we opted to change to ADSL, expecting slightly lower speed but a more stable line. I had been having line problems on ADSL, and have recently switched to 20MB VDSL, but it seems even less stable now. I remember the attenuation sitting at 60.2db, now it has crept up to 61.4db, and i expect it to increase further. VDSL2 est l'acronyme de Very high speed Digital Subscriber Line 2. is Line Attenuation. Basically it's the distance between you and the ISP and the quality of the copper to your house. Maximum signal loss recommendation is usually about 60dB. 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. 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