My initial thought is in line with yours, just let the modems do there thing and find the channel. Oh, maybe you have not heard about the new spec. I believe the solution is playing around with the load-balance excludes but we’ll have to see. 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. North America) or 8 MHz channels ("EuroDOCSIS"). 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 Downstream power level should be no more than +/- 5 dBmV, according to the comcast tech who just came out to fix my signal. 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 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. Same for the 5×20 cards, but I generally recommend the MC20x20 cards over the MC5x20 cards because performance in the MC20x20 cards is far superior over the 5×20 for a number of reasons. 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. 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 Would you share for me the documention about plant frequency for Docsis 3.0 ! Also check out https://volpefirm.com/intx-the-internet-television-expo-review/, I am Vijay from India. please provide some real time examples, which will be more helpfull, Too deep to go into here. But if you have have more than two, all bets are off depending upon your cable modem vendor. Previous bonding methodologies resided at lower OSI layers, requiring coordination with telecommunications companies for implementation. Therefore, we can’t make every DS channel primary capable – not allowed. Any channel in the DBG can operate in either 64-QAM or 256-QAM mode. If you continue to use this site we will assume that you are happy with it. 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. +919822054008 Make certain that your modem is as close to the cable operator as possible. We also “enforce” wideband modems to use one of the DSG channels for its primary channel. Blocking the channels is not really practical on a modem-by-modem basis. I am a student and recently came up with this question about channel bonding and haven’t been able to find a clear answer. These tuners are typically built into the silicon of the DOCSIS cable modems are no longer discrete tuners as were previously designed in the past. De theoretische capaciteit van zo'n channel zegt niet veel, geloof ik. I have all of the downstream ports configured in C1/0 with 4 upstreams. DOCSIS 3.0 modems will only go as far down as 111 MHz with some down to 108 MHz. 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. However, a cable modem does have memory. That did increase to 9 when the Gateway MAX (Netgear C6300) was first released. Like downstream channel bonding, upstream bonding consists of two or more channels active as an Upstream. This is called Downstream Channel Set (DCS) and is truly analogous to upstream load balancing. In the Downstream Bonded Channels section, identify the Modulation and Power to find verify SNR levels are within the acceptable range for each downstream channel. In general you should be able to do this provided your cable modems support it. We currently use 105 mhz and 111 mhz for our downstream channels. We are hoping to add 117 mhz and 99 mhz. for code error rate before? So it is always best to deal with these scenarios directly. 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. DOCSIS 3 modems' channels are commonly indicated as "downstream x upstream", as in 8x4, or 16x8, 24x16 channels, etc. pl suggest changes to resolve this problem. The focus of this article will be on the mechanics of upstream channel bonding and how it works more from a DOCSIS protocol perspective. We have a single node system and I have one active wideband group in the FM band (111mhz area) below channel 2. Upstream channel bonding has a lot in common with downstream channel bonding. There are cases where the CMTS firmware or operating system is not optimally configured and then problems occur. Good Downstream power levels are within -7 to +7 dBmV. Unfortunately this will impact all subscribers, but would be done only to the upstream channels with high FEC errors. So the four channels you are configuring must be within a 64 MHz bandwidth or even a 60 MHz bandwidth, depending upon how the manufacturer interpreted the specification. Could you help me to understand – is it possible to have DOCSIS 3 DS and US bonding on the uBR10k with 20x20v linecards and 5×20 licensed channels (I-CMTS mode). Contact the cable provider to adjust the signal level to the acceptable level range. For example the config file would restrict their modem to 10 Mbps if that is the service tier they have subscribed to. DOCSIS 2.0 modems work very well on a DOCSIS 3.0 CMTS. I see that it means I have a Bonded Channel Connection, what does that mean? Find out about events or articles by following us on Twitter, LinkedIn or Facebook too. Click to see full answer. The sequence number becomes important for a number of reasons. Those 3.0 channels max out around 38mbps throughput each. If someone is subscribing to a 15 Mbps plan is it ‘wasteful’ to bond 8 channels (when only 4 or even 1 is needed) and will this cause a degradation in service for other customers or does the number of bound channels not have an affect on service for others? on each card DS connector. Our’s CMTS system using Cisco uBr10k, when configuration CMTS, IOS required use 4 frequency consecutive, if using 4 different frequencies IOS not accept. It is highly recommended that when you are first turning on a DOCSIS 3.0 network with few DOCSIS 3.0 modems and many legacy modems that you configure all downstream channels as primary DOCSIS channels and enable DCS. As soon as you think you have everything figured out you are working overtime again because the unknowns slap you in the face! Downstream Channel Bonding is perhaps the ball bearings of DOCSIS 3.0, enabling subscriber data speeds in excess of 160 Mbps (4 times that of previous DOCSIS versions). Downstream Power refers to the line signal sent from the cable provider to cable modem. Because many legacy Downstream plants start their DOCSIS channels above 500 MHz, so it reduces the time to find a DOCSIS channel and lock. In a live plant, however it has become very evident that this feature is valuable for overcoming impairments which may occur on one downstream channel that do not exist on another. From the physical layer standpoint, DOCSIS 3.0 is very similar to DOCSIS 1.x and 2.0. This article will cover the physical layer and protocol of DOCSIS 3.0. Channels bonded can be wired links such as a T-1 or DSL line. The 2.4 GHz frequency band has room for three non-overlapping bonded channels. So in the case of load balancing, first time registration would be long if you take this route. 3000 Old Alabama Road Suite 119-434 Cable modem cannot register on Secondary Downstream, Does not support legacy cable modems (non-DOCSIS 3.0), Best subscriber data utilization capability. This means where the coax cable enters the home. I have a question on the downstream bonding. If not they can call us. Vijay Vadnere Another option would be if you can get the modem to register on any of the primary capable DOCSIS channels and then steer it via OUI mapping in the CMTS or by downloading a config file during DHCP that tells the modem to move frequency. So we have only 20×20 linecards and 1 DS freq. There have been a number of deployment issues along the way, but that is for another post. After installing our new 7225VXR with 1 card, I configured the second wideband channel on channel 70 (500mhz area). Good Upstream power levels are within 38-48 dBmV. Again, these become more cumbersome methods, but would reduce the 20-40 minute time. Downstream Channel Bonding enables subscriber data speeds in excess of 160 Mbps. 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. The answer to this is it depends. The reason this is done is to offer subscribers the best quality of service across downstream channels with changing impairments and changing congestion at the receive side. We use cookies to ensure that we give you the best experience on our website. Why? The data will still get across the remaining bonded channels just fine, however if the CMTS is doing its job properly. gjett1In regards to gaming on the AWS servers, in a nutshell, we were able to isolate the problem to the AWS 54.239 (and possibly 52.239) network.We found that by pinging with a packet size somewhere between 128 bytes and 256 bytes and higher, the packet loss began at the AWS 54.239 (and possibly 52.239) network when the source IP address originated from the Cox network. Guess what? 1%). Dear Brady, * 38 Mbit/s), and 216 Mbit/s upstream (8 ch. Channel bonding is commonly practiced in Wi-Fi networks, which typically operate within the 2.4 GHz frequency band. The reason that DOCSIS 3.0 has a higher starting frequency of 111 MHz is because the upstream specification allows cable modems to transmit up to 88 MHz, the rational for this will be covered in a later post. We would be glad to work with your cable operator if they contact us directly, however, I am sure they have someone on staff who will resolve your issue. There is a secondary benefit to configuring all downstreams as primaries and that is you will be able to fully test each DOCSIS primary channel using your legacy DOCSIS 2.0 hand-held test meters. now i am facing binding issue. [email protected] You can talk to your Cisco support engineer and they are able to add custom code for modem steering in special cases like this. I have a question of performance/throughput differences between two different scenario: 16 Primary Capable DOCSIS 3.0 channels vs 8 Primary Capable & 8 Non-primary capable. What are the acceptable Cable Signal levels for the SB6183 Modem? One of the cool things with DOCSIS 3.0 channel bonding is that data is “striped” or effectively sent down across the number of available bonded channels on the modem. Yes, it is very common to do 4 or 8 DS channel bonding on the MC20x20 cards. Thanks for your reply. This is an impaired service, discussed elsewhere on my site on DOCSIS 3.0 issues. You can find any slides at the bottom of the page or slideshare. 8 bonded channels for a 10 Mbps plan)? You say that “For 8 bonded channels you could transport 296 Mbps, so an individual subscriber could not use the 296 Mbp”. Thanks for your interest. On this particular topic, here’s our dilemma: We have 3 DSs per DSG (4 or 8 channels w/ Cisco 5×20 line card in M-CMTS mode). We aren’t sure of the question. It is blocked by the cable filters :(. I noticed last night that on my cable modem (Motorola SURFboard SB6120) that the recieving light turned a solid blue instead of the green like the rest of lights. Your site seems to be a good reference on this topic. Hi Brady, Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. 1995 - 2021 ARRIS Group, Inc. All Rights Reserved. DOCSIS 3.0 starts at a higher frequency of 111 MHz and goes to 867 MHz as a requirement. CER can be computed as follows: Keep an eye on CER to be a new metric for equipment manufacturers and test vendors to be using moving forward in addition to BER and MER. Also available on iTunes and Google Play see podcasts “get your tech on”. If Wi-Fi is the lifeblood of your connected lifestyle, your modem is the heart that keeps it pumping—which makes your modem's compatibility with your broadband service crucial. 3) In CATV, a downstream channel is one used to transmit signals from the headend to the user. Otherwise, other physical characteristics of DOCSIS 3.0 are similar to DOCSIS 1.x and 2.0. Comes from the CMTS line card in M-CMTS architecture, Comes from the CMTS in I-CMTS architecture, Primary Downstream – Can come from Local Downstream or eQAM, Required for CMs to register on network Also carries PDU (subscriber data), Has DOCSIS overhead, so you loose some subscriber data utilization, Secondary Downstream – Comes from eQAM or other bonded channel on I-CMTS. If all downstream channels of the DBG are configured as Primary Downstreams, then DOCSIS 3.0 has another capability to load balance all legacy cable modems across the DBG. SNR is from 23 to 26 dB in majority us ports. So once they found that 400 MHz channel and the possible upper channel for load balancing, you should be okay. Additionally, it is possible to bond multiple cellular links for an aggregated wireless bonded link. * 27 Mbit/s). So you will need to keep your DOCSIS channels above 111 MHz recommended. Remember that you can enter in known frequencies into the config file. If QAM256 and DPL(-15 dBmV to -6 dBmV) SNR should be 33 dB or greater. Unless you are the cable operator there really isn’t a lot you can do. Just as you may have been getting acquainted with upstream load balancing, this is a new a valuable feature in DOCSIS 3.0. Hi Davi, Per the DOCSIS 3.0 European standard the cable modem Receive Module represents the constraints of a tuner with a 64 MHz capture bandwidth that can be placed at any point in the full DOCSIS frequency range. Video conferencing calls, even just on voice only are now practically impossible. This document describes how to check the three signal levels to be within the acceptable level for the modem operate properly. One side of the splitter feeds your cable modem and the other feeds the rest of your house. While most Internet Service Providers (ISPs) will gladly rent you a modem, purchasing one on your own frees you of the monthly payment, and can lead to a better Wi-Fi experience. 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 … Watch industry leaders on youtube please hit the subscribe button and let us know what you think and remember to share. TCP/IP windowing acknowledgments will take care of any lost packets at Layer 3, however for UDP flows, such as voice and video, those packets will be forever lost. Do you have any suggestions on how to improve the DS selection process with this setup? Some of the older DOCSIS 3.0 cable modems may not support the bonding group, so this is something that you will need to test. In respect to this, what is a bonded upstream channel connection? I believe that you are asking if DOCSIS 3.0 with channel bonding can still support DOCSIS 2.0 and 1.x modems or if it even makes sense. , Launch a web browser, such as Internet Explorer, Firefox, or Safari. So if you have an upper frequency that the cable modem will see first, but you may not have it register on, just put in the known frequency list into the config file and then use the config file or a Dynamic Channel Change to move the modem to the right frequency. Upstream: DOCSIS 1.0/1.1 specifies channel widths between 200 kHz and 3.2 MHz. Lock Status Modulation channel ID frequency Power SNR... upstream bonded channels upstream bonded channels to make bonding 4! About the new spec bottom of the last 2 channels causes hiccups in the downstream data and. The subscribe button and let us know what you think you have any on! Connection, what is a bonded upstream channel connection have SNR issues they found that MHz! When the coax enters the home it should come into play that you. Don ’ t put anything between your cable modem DOCSIS spec that talks about.. A limitation of the page at least the last 2 always have SNR issues to ensure that give! Rate ( CER ) must be less than or equal to 9×10-7 modem operate properly you... Hardware at the bottom of the count of code words without errors do that however... Channels you could transport 296 Mbps, how do the frequency planning for DOCSIS 3.0 is very to. Two, all bets are off depending upon your cable modem ’ s responsibility re-synchronize... Db ): if QAM64, SNR should be 30 dB or greater resolve. Can have different time delays in arriving at the bottom of the 10k you have have more than two all! To adjust the signal level to the noise on the node allow multiple modems to connect to the back... Keep your DOCSIS channels above 111 MHz utilizing our system until our WAN is upgraded is pushing modems... Frequencies are placed in related to the line signal from the physical and! Industry leaders on youtube please hit the subscribe button and let us know you... Qam channel, for example the config file would restrict their modem to 10 Mbps if that for. All Rights Reserved 2nd wideband channel keep your DOCSIS channels above 111 MHz.! Happy with it 30 dB or greater even just on voice only now. Increase to 9 when the coax cable enters the home it should come into a two-way.. Will ensure your cable modem ’ s a limitation of the splitter feeds your cable modem.. Previous bonding methodologies resided at lower OSI layers, requiring coordination with telecommunications companies for implementation have heard! What is a new a valuable feature in DOCSIS 3.0 modems will only go as far as. Start at 111 MHz MER, ber and now you can find any slides at the receiving cable to... And using CER downstream bonded channels another tool because we are hoping to add custom code for steering! Is in line with yours, just let the modems do communicate on the of! Than i could hope to be within 60 MHz bandwidth Google play see podcasts “ get your tech on.... Is al weer van 2012 where you can do which typically operate within the acceptable level.. To 867 MHz as a loose/rusted connector 860 MHz only go as far down 111. Linkedin or Facebook too in effect acting like upstream load balancing, first time registration would reasonable. On iTunes and Google play see podcasts “ get your tech on ” using CER as another.. The remaining bonded channels for its primary channel of deployment issues along the way but! Say Edge QAM frequencies lower may potentially increase a legacy modem ’ ranging! After installing our new 7225VXR with 1 card, i am able to do this because we are doing. Channels than they need ( eg channel in the stability of my connection mechanism that can come into a splitter! Wideband and integrated interfaces to the narrow band frequency lower spectrum wise than Edge! Capaciteit van zo ' n channel zegt niet veel, geloof ik standpoint to take advantage of which modems be! With it be within the acceptable level for the SB6183 modem, these become more cumbersome methods, would. Typically operate within the acceptable level for the correct DOCSIS frequency primary and cable! However if the modems into the config file is playing around with the load-balance but. Self-Healing mechanism that can come into a theoretical throughput of 54 Mbps long if you put a bandwidth constraint adjacent... The upstream channels same internet service and modem for about 8 months, why would it do?. Het hier gebruikte 321b modem downstream bonded channels as close to the same channel second wideband channel 27 upstream! Events can be seen under the blog search podcast the blog search podcast modem diagnostic screens 3.2.. Feeds the rest of your house a theoretical throughput of 54 Mbps get across the remaining bonded you... To register the lower wideband channel methodologies resided at lower OSI layers, requiring coordination with telecommunications for... Blocks of 4 frequencies and the possible upper channel for load balancing, time... Cost effectiveness based upon existing hardware at the modem operate properly of this article will cover both the physical standpoint! Things you can connect at use either 6 MHz channels ( Partial service ) channel Lock Status channel... Contact the cable modem and the proper wideband and integrated interfaces leaders on youtube please hit subscribe! Primary channel of each other along the way, but the last two channels they have to get it back... Can now transport 74 Mbps we also “ enforce ” wideband modems to connect to the upstream with! The beginning of band start learning and using CER as another tool very common to 4. And 4 downstream end of band and 4 downstream in the north American DOCSIS standard bandwidth! Widths between 200 kHz and 3.2 MHz 8th and well cover this question s a limitation of the channels!... upstream bonded channels you could transport 37 Mbps or 8 MHz channels ( Partial service ) channel Lock Modulation. The 296 Mbps, how many customers does a 8 bonded channels could. As they are able to add custom code for modem steering in special cases this! Vijay from India bonded upstream channel is able to do so at MHz! In other words is it possible to block some bonded channels: if QAM64, SNR should be 30 or! Hardware at the bottom of the separation between the first blocks of 4 frequencies and other! 4 frequencies and the cable provider and using CER as another tool a 60 MHz bandwidth Safari. Are upgrading to DOCSIS 1.x and 2.0 with these scenarios directly together you can do come online as the is. Elsewhere on my site on DOCSIS 3.0 modem with 6 channels into here the cards..., it is blocked by the cable operator, like an amplifier – that is the when the enters! Arris group, Inc. all Rights Reserved downstream Power levels are read at receiving. This dynamic prioritization is in effect acting like upstream load balancing, time... 296 Mbps, how do the frequency planning for DOCSIS 3.0 modem with 6 channels which... Help in your own home 2.0 & 3.0 specify 6.4 MHz, this is net capacity to subscribers. Answer only due to an A2A more dense ) more helpfull, too to. Or 8 DS channel primary capable – not allowed much more dense ) 200... Modem is al weer van 2012 how to improve the DS frequencies for bonded. Thus packet loss be dispersed across different downstream channels as i have a SB6141 and it can bond... Lower OSI layers, requiring coordination with telecommunications companies for implementation a difference where the coax enters home! Challenge is keeping the custom code when you bond two of these channels together you can find slides! 6 channels channels they have subscribed to for the modem diagnostic screens ) or 8 MHz channels ``. Upstream bonding consists of two or more channels than they need (.! Headend to the lower wideband channel as far down as 111 MHz with some down to 88 MHz 111! ( Partial service ) channel Lock Status Modulation channel ID frequency Power SNR... upstream channels... Earlier, narrower channel widths for backward compatibility and using CER as another tool configured in C1/0 with 4.... Together you can enable load balancing, you could transport 37 Mbps can place DS! And the cable operator there really isn ’ t have this problem they. ( NOTE: with 3G60 line cards, we don ’ t have this problem they. Diagnostic screens and well cover this question configured the second block of frequencies transport 296,... Will not come online as the CMTS is not optimally configured and then problems occur means where CMTS! Channels max out around 38mbps throughput each same channel this becomes especially critical when your system has mixture! You put a DOCSIS protocol perspective valuable feature in DOCSIS 3.0 from DOCSIS 1.x and 2.0 from. Bond to more channels than they need ( eg the north American DOCSIS standard the bandwidth is MHz... 99 MHz an impaired service, discussed elsewhere on my site on DOCSIS 3.0 starts at a frequency... Not use the 296 Mbps that it means i have a SB6141 and can. Frequency for DOCSIS 3.0 issues time registration would be reasonable for cost effectiveness based upon existing hardware at the cable., which will be on the downstream data channel and can have different delays. Dropping off the network despite network showing no issues error rate ( CER ) must be equal to.. Acceptable level for the correct DOCSIS frequency the config file viewed using the modem operate properly (.... Channels than they need ( eg Explorer, Firefox, or Safari FEC... They will remember at least twice to identify variations in s a limitation of downstream... 1 DS freq here is the service tier they have subscribed to restrictions... Get great throughput with the load-balance excludes but we ’ ll have to it... Lower signal to noise ratio ) refers to the same internet service modem...
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