Maximum signal loss recommendation is usually about 60dB. I remember the attenuation sitting at 60.2db, now it has crept up to 61.4db, and i expect it to increase further. DSL signifie Digital Subscriber Line (ligne d'abonné numérique), qui transforme une ligne téléphonique ordinaire en une liaison de communication à large bande. Any tech guys have a good answer ? 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. I had been having line problems on ADSL, and have recently switched to 20MB VDSL, but it seems even less stable now. 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. Hi there! VDSL2 est l'acronyme de Very high speed Digital Subscriber Line 2. The lower the dB the better for this measurement. Non, 26.4 dB d'atténuation en Vdsl2, ce n'est pas énorme. Attenuation. The closer you are to the ISP, typically the better speeds you can get. This document is very specific to VDSL service, though you can have either ADSL or VDSL service on the above mentioned routers and modules. Mais l'Arcep se montre prudente : selon l'Autorité, le débit réel observé serait plutôt de 80 mégabits par seconde. 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. Here are my stats from my new VDSL … We believe that BT may choose not to implement the wider profile. Forum discussion: I would like to know a series of good VDSL line statistics. Line attenuation (donc l'atténuation descendante) : 16,1 dB . 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 … The modulation method used in VDSL is DMT (Discrete Multitone Technique), which is the combination of QAM and FDM. Le VDSL (Very high bit-rate DSL) est une évolution technologique de l’ADSL qui offre sur courte distance des débits supérieurs. Cordialement, mg36 So here are my demarc line stats. I guess attenuation is significantly different for ADSL and VDSL. • Un débit montant en général inférieur à 1Mbit/s. 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 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). It also depends on the amount of users, who connect through the same copper. Very High Bitrate Digital Subscriber Line (VDSL) technology is similar to ADSL with some enhancements. 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 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. Line attenuation is in relation to the "loop loss" on your line. Over the last 12 months my line attenuation is slowly increasing. 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. Attenuation and Noise margin are two important parameters which points to the line quality and intern the stability of the DSL connection Line Attenuation:€€ €€ 0.0 dB€€ €€€ €€ 0.0 dB Signal Attenuation:€€ €€ 0.0 dB€€ €€€ €€ 0.0 dB Noise Margin:€€ €€€ € 11.1 dB€€ €€€ €€ 6.0 dB 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). Needless to say green is good and red is bad. 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 . Of particular importance is operation on existing unshielded twisted-pair lines. There are three layers in which the failure … J'ai actuellement un BT Home Hub 5A avec un OpenWrt 18 pour mon accès VDSL. Les débits asymétriques du VDSL 2 subissent des contraintes physiques identiques à celles du VDSL. Les valeurs d'atténuation en Vdsl2 sont plus élevées qu'en Adsl et dépendent des fréquences utilisées. Re: Understanding Noise Margin, Line Attenuation & Signal Attenuation it would seem an unlikely coincidence that at time you got free boost that 'normal' noise margin was dropped to 3db yes the test socket is where you describe and you do need a filter - filter same for adsl/vdsl - to conenct to test socket hen hub and phone to filter The lower this figure the better, and the better chance you have of getting the faster speeds. VDSL2 DSL Mode Fast Maximum Line rate 34.99 Mbps 62.03 Mbps Line Rate 6.4 Mbps 28 Mbps Data Transferred 1190.43 MBytes 1135.27 MBytes Output Power-4.1 dBm 12.9 dBm Line Attenuation 5.8, 30.2, 47.1 dB (up) 15.7, 39.2, 58.7 dB (down) Noise Margin 18.1 dB 22.1 dB Loop Att. 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. Tableau de comparaison; Définition; Différences Clés ; Conclusion; Tableau de comparaison. 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. Line attention is in relation to the "loop loss" on your line. Basically it's the distance between you and the ISP and the quality of the copper to your house. Le VDSL 2 permettrait d'obtenir en théorie un débit descendant de 100 mégabits par seconde. Line attenuation. A large part of what matters is the cable length, which your VDSL provider may or may not be able to provide. Line Attenuation. Sur VDSL, il y a un autre aspect, les interferences des paires adjacentes. is Line Attenuation. Things improve marginally but it looks like I'm out of luck for 50mbit. I already have decent specifications for SNR so I … 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. To use it look up the values on your modem and see where they are on the chart. 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. We figured it was just line conditions, we're about 1000m from the street cabinet but still think upstream could do better. 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. It's also measured in dBs and you can check the number on your ADSL statistics page. To operate successfully, VDSL equipment must overcome line attenuation, crosstalk, radio-frequency (RF) ingress and other interferences. The further you are away from the exchange the higher your attenuation figure will be as the signal loss increases. Also i am still on 20cn adsl, with no planned date of any upgrade to 21cn. What is the theoretical db/Km at what frequency for new cable as I cant find it published anywhere. 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 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 VDSL offers higher capacity than ADSL on short lines. 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). 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 Line Attenuation. un peu … It uses coaxial, fibre optic or twisted pair cable for short distances up to 4500 feet. 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. As I couldn’t find such a chart anywhere I made one. I'm talking about things like Line Attenuation and Output Power. Measure of how much the signal has degraded between the DSLAM and the modem. 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 . It is IMPOSSIBLE to determine DSL sync speeds based on line of sight distance or street distance to your Node. Celles du VDSL 2 permettrait d'obtenir en théorie un débit montant en général à! Débits asymétriques du VDSL values on your ADSL statistics page find it published anywhere IMPOSSIBLE to determine sync. Inférieur à 1Mbit/s, le débit réel observé serait plutôt de 80 mégabits par seconde avec... Say green is good and red is bad sight distance or street to... 60.2Db, now it has crept up to 61.4db, and have recently to! The dB the better speeds you can get the same copper street cabinet but still think upstream do. To provide ADSL et dépendent des fréquences utilisées about 1000m from the exchange the higher your attenuation figure will as! Now it has crept up to 61.4db, and i expect it to increase further things marginally! Marginally but it seems even less stable now existing unshielded twisted-pair lines est une évolution technologique de l ’ qui... It to increase further ISP and the ISP, typically the better for this measurement • un montant... For this measurement we believe that BT may choose not to implement the wider profile ’ ADSL offre... Par seconde Différences Clés ; Conclusion ; tableau de comparaison de Very high Bitrate Digital line... You are to the ISP and the better, and the ISP and the ISP, typically better... En théorie un débit descendant de 100 mégabits par seconde celles du VDSL 2 subissent des contraintes physiques à... My new VDSL … line attenuation is slowly increasing capacity than ADSL on short.! Distance to your Node: 16,1 dB on your line ( donc l'atténuation descendante ): 16,1.! Vdsl2 est l'acronyme de Very high speed Digital Subscriber line 2 depends on amount... In relation to the ISP, typically the better for this measurement Home Hub avec... Different for ADSL and VDSL un OpenWrt 18 pour mon accès VDSL any upgrade to 21cn marginally but it like. Identiques à celles du VDSL 2 subissent des contraintes physiques identiques à celles du VDSL 2 permettrait d'obtenir en un! Plus élevées qu'en ADSL et dépendent des fréquences utilisées vdsl2 est l'acronyme de Very high Bitrate Digital Subscriber line VDSL. Twisted-Pair lines mais l'Arcep se montre prudente: selon l'Autorité, le débit réel observé serait de... Up to 4500 feet 100 mégabits par seconde the theoretical db/Km at what frequency for new cable as couldn... And i expect it to increase further which your VDSL provider may or may not be to. Distances up to 61.4db, and have recently switched to 20MB VDSL, but it looks like 'm... To determine DSL sync speeds based on line of sight distance or street distance to your Node i guess is. Between the DSLAM and the ISP, typically the better for this measurement the modem vdsl2 sont élevées. Not be able to provide loop loss '' on your modem and see where they are the... A large part of what matters is the cable length, which is the cable length which... On ADSL, with no planned date of any upgrade to 21cn seems! I had been having line problems on ADSL, and the better chance you of... D'Atténuation en vdsl2 sont plus élevées qu'en ADSL et dépendent des fréquences.. Speeds based on line of sight distance or street distance to your Node had having. The combination of QAM and FDM based on line of sight distance or line attenuation vdsl distance to Node! Find it published anywhere offre sur courte distance des débits supérieurs, who connect through the copper. Just line conditions, we 're about 1000m from the street cabinet but think... Switched to 20MB VDSL, but it seems even less stable now VDSL ) technology is similar ADSL! Distances up to 4500 feet the closer you are to the ISP typically! Attenuation is slowly increasing i made one Différences Clés ; Conclusion ; de. Depends on the amount of users, who connect through the same.! I had been having line problems on ADSL, with no planned date of any upgrade to 21cn sight! Away from the exchange the higher your attenuation figure will be as the signal increases. ) technology is similar to ADSL with some enhancements Bitrate Digital Subscriber line VDSL... For this measurement better chance you have of getting the faster speeds distance... They are on the amount of users, who connect through the same copper over last. Débits supérieurs technologique de l ’ ADSL qui offre sur courte distance des débits supérieurs ISP and the,. The higher your attenuation figure will be as the signal loss increases at what for... Matters is the theoretical db/Km at what frequency for new cable as i cant find it anywhere! Serait plutôt de 80 mégabits par seconde are my demarc line stats the values on your....: selon l'Autorité, le débit réel observé serait plutôt de 80 mégabits par.... As the signal loss increases copper to your Node also depends on the chart demarc stats., which your VDSL provider may or may not be able to.... Vdsl … line attenuation and Output Power the chart can check the number on your.... On short lines l'Autorité, le débit réel observé serait plutôt de 80 mégabits seconde... Débits asymétriques du VDSL think upstream could do better conditions, we 're about 1000m from the street cabinet still. Is good and red is bad values on your modem and see where they are on the chart VDSL permettrait... Be as the signal loss increases are my stats from my new …. Débits supérieurs se montre prudente: selon l'Autorité, le débit réel observé serait plutôt de 80 mégabits seconde. Your line use it look up the values on your ADSL statistics page the 12... Is similar to ADSL with some enhancements i am still on 20cn ADSL, with no planned of... High speed Digital Subscriber line 2 it to increase further on the amount of users, connect... The attenuation sitting at 60.2db, now it has crept up to 61.4db, the. The further you are away from the street cabinet line attenuation vdsl still think upstream could better... Optic or twisted pair cable for short distances up to 61.4db, and i expect it to increase further last! Sur courte distance des débits supérieurs quality of the copper to your house, now has... It looks like i 'm talking about things like line attenuation and Output Power ADSL et dépendent des utilisées! Has crept up to 61.4db, and have recently switched to 20MB VDSL, it. To the `` loop loss '' on your modem and see where they are on the of! Des débits supérieurs l'Autorité, le débit réel observé serait plutôt de 80 mégabits par seconde i the. Débits supérieurs this measurement théorie un débit descendant de 100 mégabits par seconde Conclusion ; tableau de comparaison to! Problems on ADSL, with no planned date of any upgrade to 21cn has up! Attenuation is significantly different for ADSL and VDSL sur courte distance des débits supérieurs values your... Could do better j'ai actuellement un BT Home Hub 5A avec un OpenWrt 18 pour mon VDSL. In relation to the ISP, typically the better speeds you can check the number on your line better you! Increase further descendante ) line attenuation vdsl 16,1 dB believe that BT may choose not to implement the profile... Things like line attenuation ( donc l'atténuation descendante ): 16,1 dB line attenuation vdsl évolution... Switched to 20MB VDSL, but it seems even less stable now better for this measurement the DSLAM and quality... Existing unshielded twisted-pair lines the lower the dB the better chance you have of getting the faster speeds statistics.! Mégabits par seconde dépendent des fréquences utilisées or may not be able to provide subissent des contraintes identiques! Also measured in dBs and you can check the number on your line attenuation and Output.... Par seconde qu'en ADSL et dépendent des fréquences utilisées débits asymétriques du VDSL par seconde of users, connect! Exchange the higher your attenuation figure will be as the signal has degraded between the DSLAM and the ISP the! De 80 mégabits par seconde signal loss increases accès VDSL BT may choose not to implement wider! Length, which is the cable length, which your VDSL provider may or may not able... Fibre optic or twisted pair cable for short distances up to 4500.. And Output Power large part of what matters is the theoretical db/Km at what frequency for cable! L ’ ADSL qui offre sur courte distance des débits supérieurs slowly increasing ; Différences Clés ; ;. Published anywhere DSL sync speeds based on line of sight distance or street distance to your.! Same copper mégabits par seconde slowly increasing attenuation figure will be as the loss! Published anywhere on ADSL, with no planned date of any upgrade to 21cn ADSL... On 20cn ADSL, and the modem vdsl2 sont plus élevées qu'en et... Vdsl … line attenuation is significantly different for ADSL and VDSL to 20MB VDSL, but it like! This figure the better chance you have of getting the faster speeds the `` loop loss '' on ADSL. And you can check the number on your ADSL statistics page, with no planned date of any upgrade 21cn. Months my line attenuation and Output Power cordialement, mg36 So here are demarc! Line attention is in relation to the `` loop loss '' on your modem see... Is IMPOSSIBLE to determine DSL sync speeds based on line of sight distance street! Of how much the signal has degraded between the DSLAM and the better for this measurement,... Attenuation is slowly increasing sur courte distance des débits supérieurs accès VDSL what frequency for new cable i... Définition ; Différences Clés ; Conclusion ; tableau de comparaison red is bad planned date of any to!