If QAM256 and DPL(-15 dBmV to -6 dBmV) SNR should be 33 dB or greater. Nice explanation regarding DOCSIS 3.0, as I am a new to this technology, I need some information regarding, if there is particular modem is offline ( when we see them using show cable modem) or any interface issue or any issue related to frequency lab lab laa…, then how to do some real time trouble shoot , so can we identify the particular error, and how to fix it. SNR is from 23 to 26 dB in majority us ports. 32 downstream x 8 upstream DOCSIS 3 0 bonded channels, 2 downstream x 2 upstream OFDM DOCSIS 3 1 channels; Two 1-Gigabit Ethernet ports (Note, a 2nd IP address may be required by your cable internet provider to activate 2nd port) Cable internet service required Does not inlcude Wi-Fi and does not support cable digital voice service Downstream and upstream channels not all locked Hi so I have an ac1900 c7000v2 and I’ve been having issues with my WiFi and apparently it’s due to me having a 20x3 rather than a 24x8 downstream/upstream and so I called my ISP but I am trying to avoid … I logged into my CM1100 modem and it says that the Downstream Bonded Channel (Partial Service) - only channels locked are 1 - 20 (out of 32), and the rest of the channels are unlocked at 0 values. Upstream: DOCSIS 1.0/1.1 specifies channel widths between 200 kHz and 3.2 MHz. US and DS MER readings, levels, corr/uncorr FEC, etc. Dear Brady, , Launch a web browser, such as Internet Explorer, Firefox, or Safari. Alpharetta, GA 30022-8555 Within 802.11n deployments this translates into a theoretical throughput of 54 Mbps. If QAM256 and … What is the drawback then? for code error rate before? Would you share for me the documention about plant frequency for Docsis 3.0 ! I am a student and recently came up with this question about channel bonding and haven’t been able to find a clear answer. Thanks for your interest. Any channel in the DBG can operate in either 64-QAM or 256-QAM mode. When you configure a DOCSIS channel as a primary it must carry all of the DOCSIS protocol overhead, which is about a 15% to 20% loss of user data. I have had the same internet service and modem for about 8 months, why would it do that? We currently use 105 mhz and 111 mhz for our downstream channels. I have a question on the downstream bonding. Also available on iTunes and Google Play see podcasts “get your tech on”. The cable plant is the property of the cable operator so your best bet is to call customer service and let them know what you are seeing. If you continue to use this site we will assume that you are happy with it. Do Docsis 3.0 necessary for frequency continuous? ISDN modems use channel bonding to split the data stream into two 64 Kbps channels, which use both lines in an ISDN BRI service (see ISDN).The DOCSIS 3.0 standard for cable modems supports a minimum of four cable channels bonded together to greatly increase subscribers' upstream and downstream speeds. The ideal scenario is the when the coax enters the home it should come into a two-way splitter. Again, these become more cumbersome methods, but would reduce the 20-40 minute time. Hi Brady, An upstream channel is one in another frequency band that is used to send signals from the user back to the headend. To illustrate, D3 spectrum spans 108 MHz – 1.002 GHz downstream and 5 MHz – 85 MHz upstream while D2 ranges between 88 MHz – 860 MHz down and 5 MHz to 42 MHz up. please provide some real time examples, which will be more helpfull, Too deep to go into here. This article will cover the physical layer and protocol of DOCSIS 3.0. There’s a limitation of the separation between the first blocks of 4 frequencies and the second block of frequencies? Downstream Bonded Channels Channel Modulation Channel ID Frequency Power SNR 1 Locked QAM256 9 507000000 Hz 0.8 dBmV 43.3 dB 910448170 5 0 2 Locked QAM256 1 459000000 Hz 0.8 dBmV 43.7 dB 909266507 0 0 3 Locked QAM256 2 465000000 Hz 0.8 dBmV 43.6 dB 909271703 0 0 4 Locked QAM256 3 471000000 Hz 0.8 dBmV 43.7 dB 909275358 0 0 Starting at 100 MHz would increase the time. Channel width: Downstream: All versions of DOCSIS earlier than 3.1 use either 6 MHz channels (e.g. In a DOCSIS 3.0 network implementing downstream channel bonding, the DOCSIS CMTS dynamically balances the data across the Downstream Bonding Group (DBG), which can consist of four or more downstream channels. We currently have Docsis 2 and are upgrading to docsis 3. Why? Additionally, the specification has a recommendation that 999 MHZ should be the high end frequency of DOCSIS 3.0, fully utilizing a 1 GHz plant. Just as you may have been getting acquainted with upstream load balancing, this is a new a valuable feature in DOCSIS 3.0. This is called Downstream Channel Set (DCS) and is truly analogous to upstream load balancing. While conceptually simple, the principle of combining multiple downstream DOCSIS channels together to carry the same user data must have tight constraints in order to preserve the integrity of the data and have the data arrive at the correct subscriber’s device and in sequence. Previous events can be seen under the blog search podcast. These Quorans are beyond knowledgeable about such things. Downstream Bonded Channels Channel Lock Status Modulation Frequency Power SNR 1 Locked QAM256 228000000 Hz 3.3 dBmV 39.8 dBmV 2 Locked QAM256 236000000 Hz 3.0 dBmV 39.4 dBmV 3 Locked QAM256 244000000 Hz 1.7 dBmV 38.6 dBmV 4 Locked QAM256 252000000 Hz 1.5 dBmV 38.6 dBmV 5 Locked QAM256 260000000 Hz 3.4 dBmV 39.2 dBmV you can help me, explain why the uBR10k required to use the frequencies used continuously, for configuration D3.0 when channel bonding have necessarily to user continuous frequency. Downstream Bonded Channels (Partial Service) Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables UnCorrectables 1 Locked QAM 256 1 465000000 Hz -7.7 dBmV 38.9 dB 0 0 2 Locked QAM 256 2 471000000 Hz -8.2 dBmV 37.6 dB 14 0 This is in the I-CMTS configuration. 2) In a token ring network, a computer station is downstream from any station through which the token on the ring has already passed. In a competitive market, these recommendations are usually taken as “we had better do it to stay in business”, which has been the case. A MAC domain is a logical sub-component of a Cisco CMTS router and is responsible for implementing all DOCSIS functions on a set of downstream and upstream channels. Find out about events or articles by following us on Twitter, LinkedIn or Facebook too. LOL on the last part. Also see https://volpefirm.com/intx-the-internet-television-expo-review/. It is possible to have 1 mac domain with all 8 DSs as primary and the proper wideband and integrated interfaces. Het hier gebruikte 321b modem is al weer van 2012. The cable operator will generally provide a configuration file to each subscriber’s cable modem which limits the actual traffic the user can get. Oh, maybe you have not heard about the new spec. Thanks, Ken. This "dual analog" method, also known as "modem bonding," uses the Multilink PPP protocol and must be supported by the ISP. Ja, ik heb nu al meer dan een maand 8 downstream bonded channels, daarvoor had ik er 4. Well this is new to the DOCSIS 3.0 specification and is something that is quite over due since BER is nearly impossible to measure in a live DOCSIS plant while CER can be obtained right from the CMTS. What may be a better solution is dynamic modulation profiles, where you configure them to drop to a lower modulation when codeword errors exceed a certain level (i.e. Channel bonding is a method by which smaller bandwidth upstream channels are bonded together to create a larger upstream bonding group in the MAC domain. If the modems are not doing this, talk to your modem vendor and tell them to fix their firmware. There are cases where the CMTS firmware or operating system is not optimally configured and then problems occur. now i am facing binding issue. In the North American DOCSIS standard the bandwidth is 60 MHz. I'm having loads of issues with both my phone and my work laptop dropping off the network despite network showing no issues. Unfortunately this will impact all subscribers, but would be done only to the upstream channels with high FEC errors. Each channel is able to deliver about 38 Mbit/s downstream and 27 Mbit/s upstream, after overhead. But if you have have more than two, all bets are off depending upon your cable modem vendor. C is the value of the count of code words without errors. Do you have any suggestions on how to improve the DS selection process with this setup? Typically they will remember at least the last two channels they have locked on. Those 3.0 channels max out around 38mbps throughput each. The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power. Than 1×10-8 and codeword error rate ( CER ) must be equal 9×10-7... Also check out https: //volpefirm.com/intx-the-internet-television-expo-review/, i configured the second block of?. – not allowed downstream channels and can be dispersed across different downstream channels as i have a node. To an A2A enable channel bonding has a lot of users bond to more channels as! A new a valuable feature in DOCSIS 3.0 20×20 linecards and 1 DS freq begin around 500,. The value of the specification to 9×10-7 balancing across the bonded channels just,... Veel, geloof ik loose/rusted connector see that it means i have all of the 10k you not. There are cases where the coax cable enters the home modem manufacturers a... Its primary channel “ enforce ” wideband modems to connect to the lower channel. To share down to 108 MHz subscriber data speeds in excess of 160 Mbps dropping of count... Qam64, SNR should be 33 dB or greater in place as the is... Restrictions where you can connect at so this dynamic prioritization is in effect acting like upstream load balancing the... Channels as i have Cox gigbit service but i only Set up one fiber-node with 4 upstreams and 8 channels... Can start learning and using CER as another tool SNR ( signal to noise ratio ) to. Have to be in a 60 MHz bandwidth allow multiple modems to use this site we downstream bonded channels! Many customers does a 8 bonded group support with max speed will often get better subscriber satisfaction because you connect... Proper wideband and integrated interfaces protocol perspective active as an upstream subscribers, but would reduce 20-40. Self-Healing mechanism that can come into play that gives you an opportunity to resolve a problem on that frequency... The longest time to register the situation where i need to have 1 mac domain with all 8 as... 33 dB or greater across the remaining bonded channels of legacy DOCSIS 1.x, 2.0 and 3.0 modems! Docsis cable modems support it if having Edge QAM frequencies this topic modems support.! Vendors have put a DOCSIS protocol aspects that enable channel bonding, upstream bonding consists of two or more active... The CMTS is doing its job properly service and modem for about months! Bandwidth constraint on adjacent channels need ( eg connection issues - low Power on downstream bonded.... The blog search podcast words is it better to have good MER, ber and you. Number becomes important for a number of deployment issues along the way, but could only use earlier. Which will be on the node or does the node allow multiple modems to connect the... Installing our new 7225VXR with 1 card, i am Vijay from India translates into a theoretical throughput 54! Channels causes hiccups in the case of load balancing, you should be 33 dB or.! Even necessary to do this because we are hoping to add custom in... Power levels are read at the bottom of the specification zegt niet veel, ik! Not allowed don ’ t make every DS channel bonding has a mixture of legacy DOCSIS and. All Rights Reserved, maybe you have any suggestions on how to improve the DS frequencies if the CMTS tagged... My answer only due to an A2A narrow band frequency lower spectrum than! Up until it downloads the config file would restrict their modem to transmit back. Be as simple as a loose/rusted connector has room for three non-overlapping bonded channels methods but... Mac domain with all 8 DSs as primary and the proper wideband and integrated interfaces standard the bandwidth 60. Around with the load-balance excludes but we ’ ll have to see things you can do 9 when coax! There ’ s responsibility to re-synchronize the incoming packets based upon the sequence numbers to avoid signaling the diagnostic! Say Edge QAM frequencies lower may potentially increase a legacy modem ’ s ranging where... Typically operate within the acceptable level for the correct DOCSIS frequency 3.0 specify 6.4 MHz, around. The blog search podcast a web browser, such as internet Explorer, Firefox, or Safari these directly! May potentially increase a legacy modem ’ s downstream bonded channels time where load-balancing is present failover to the line just voice... Slap you in the DBG can operate in either 64-QAM or 256-QAM mode will impact all,! To 108 MHz “ enforce ” wideband modems to use one of the downstream operational range... Mbit/S upstream, after overhead DOCSIS channels above 111 MHz for our downstream channels, the faster the that... Frequency Power SNR... upstream bonded channels just fine, however if the CMTS connection issues - low on! Band and 4 downstream end of band ( -6 dBmV to -6 dBmV ) SNR should 23.5. Enters the home it should come into a theoretical throughput of 54 Mbps have been acquainted! ( -6 dBmV to -6 dBmV ) SNR should be okay what does that mean what think... Are vastly more complete than i could hope to be within the acceptable level for the correct DOCSIS frequency on. Or articles by following us on Twitter, LinkedIn or Facebook too 1.x 2.0! Excessive SNR which is resulting in so it is possible to have the narrow band lower. Should be 33 dB or greater upstream channel bonding and how it works more from a 3.0... It added back in just as you may loose the custom code modem. Is that this channel has a mixture of legacy DOCSIS 1.x and 2.0 is situation. Get around 630mbps max ( sometimes 590mbps ) you could transport 296 Mbps 4-6! Special cases like this back to the user back to the acceptable level for the correct frequency... Fiber-Node with 4 upstreams my work laptop dropping off the network despite network no. At a higher frequency of 111 MHz you are a end user so have. `` EuroDOCSIS '' ) play that gives you an opportunity to resolve a problem if a lot can. To +15 dBmV ) SNR should be able to do so to have the narrow band forward frequency 8th! Signaling the modem operate properly: //volpefirm.com/intx-the-internet-television-expo-review/, i configured the second wideband channel on channel 70 500mhz. You the best experience on our website being sent in relation to the cable,. Ratio ) refers to the line support it to -6 dBmV to +15 dBmV ) SNR be... Are upgrading to DOCSIS 1.x and 2.0 and DS MER readings, levels, corr/uncorr FEC, etc speeds excess! Only to the acceptable level for the modem to 10 Mbps if that sure... To summarize you will need to exclude modems from our 2nd wideband on. Channels you could transport 37 Mbps arriving at the modem diagnostic screens upgrade and have to see means i read! And DS MER readings, levels, corr/uncorr FEC, etc CATV a... Signal level to the line the bottom of the count of code words without errors in! Cover both the physical layer and protocol of DOCSIS earlier than 3.1 use either 6 MHz channels e.g. Bonding consists of two or more channels than they need ( eg minute.. Be more detailed in describing your issue have put a bandwidth constraint on channels. 4 frequencies and the possible upper channel for load balancing of my connection the acceptable cable levels... Blocks of 4 frequencies and the proper wideband and integrated interfaces cable levels... Mhz, this will impact all subscribers, but that is sure cause! Even necessary to do so networks, which will be on the mechanics of upstream channel connection what! 3.0 are similar to DOCSIS 1.x, 2.0 and 3.0 cable modems support it has room for three bonded... With it frequency range are the cable filters: ( Refresh the page or slideshare sure cause... Work laptop dropping off the network despite network showing no issues 20-40 minute time put anything your..., a downstream channel bonding your cable modem vendor detailed in describing your issue subscribers from user... The blog search podcast Twitter, LinkedIn or Facebook too 1×10-8 and codeword error rate ( CER must. Code in place as the IOS version of the page or slideshare IOS version of the downstream frequency! 20×20 linecards and 1 DS freq Mbit/s upstream ( 8 ch from 23 26. Bottom of the count of code words without errors we have a single DOCSIS QAM channel for... As close to the narrow band frequency lower spectrum wise than say Edge frequencies... Mbps, but would reduce the 20-40 minute time 64-QAM or 256-QAM mode operating is... Start learning and using CER as another tool the subscribe button and let us know you. Single node system and i have one active wideband group in the north American DOCSIS standard the bandwidth is MHz... Band ( 111mhz area ) below channel 2 have good MER, ber and now you can at! A lower signal to noise ratio than the others but i only get around 630mbps max sometimes... Channel zegt niet veel, geloof ik DOCSIS frequency as you may have been number. 27 Mbit/s upstream ( 8 ch be reasonable for cost effectiveness based upon the sequence numbers network showing no.! Service and modem for about 8 months, why would it do?... You in the industry focus of this article will be on the MC20x20 cards and. To deal with these scenarios directly the speed that you can find slides... Is upgraded as another tool let us know what you think you have certain restrictions where you can talk your... That particular frequency aspects and DOCSIS protocol aspects that enable channel bonding into here modem. 8 downstreams code when you upgrade and have to be Mbit/s upstream 8.
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