3000 Old Alabama Road Suite 119-434 please provide some real time examples, which will be more helpfull, Too deep to go into here. US and DS MER readings, levels, corr/uncorr FEC, etc. Blocking the channels is not really practical on a modem-by-modem basis. So if you put a DOCSIS channel below 500 MHz, say around 400 MHz, this will take the longest time to register. If QAM256 and DPL(-15 dBmV to -6 dBmV) SNR should be 33 dB or greater. 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. pl suggest changes to resolve this problem. 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. The cable operator will generally provide a configuration file to each subscriber’s cable modem which limits the actual traffic the user can get. 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. BER must be equal to or better than 1×10-8 and codeword error rate (CER) must be less than or equal to 9×10-7. In a competitive market, these recommendations are usually taken as “we had better do it to stay in business”, which has been the case. 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. on each card DS connector. Previous events can be seen under the blog search podcast. Downstream Channel Bonding enables subscriber data speeds in excess of 160 Mbps. The CMTS/eQAM have very substantial dynamic range when it comes to transmitting across a broad range of frequencies, however in order to keep cable modem (CM) costs low, a broadband tuner is implemented in the CM. In general you should be able to do this provided your cable modems support it. I have a question on the downstream bonding. North America) or 8 MHz channels ("EuroDOCSIS"). Downstream SNR levels are read at the modem on the downstream data channel and can be viewed using the modem diagnostic screens. Typically they will remember at least the last two channels they have locked on. Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. Duc. Why? Downstream power level should be no more than +/- 5 dBmV, according to the comcast tech who just came out to fix my signal. 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) 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. India We also “enforce” wideband modems to use one of the DSG channels for its primary channel. I only set up one fiber-node with 4 upstreams and 8 downstreams. This document describes how to check the three signal levels to be within the acceptable level for the modem operate properly. It’s a bit more detailed. We ordered cable trap filters years ago that allowed up to 111mhz through so we can filter cable to houses that don’t want it. So in the case of load balancing, first time registration would be long if you take this route. I have all of the downstream ports configured in C1/0 with 4 upstreams. Good Upstream power levels are within 38-48 dBmV. Vijay Vadnere De theoretische capaciteit van zo'n channel zegt niet veel, geloof ik. Pune. So an individual subscriber could not use the 296 Mbps, but could only use the service they are paying for. 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. 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. It is then the cable modem’s responsibility to re-synchronize the incoming packets based upon the sequence numbers. Enter, Refresh the page at least twice to identify variations in. Another change in DOCSIS 3.0 from DOCSIS 1.x and 2.0 is the downstream operational frequency range. C is the value of the count of code words without errors. It is blocked by the cable filters :(. Some channels have excessive SNR which is resulting in so many Uncorrectable FEC errors thus packet loss. So Cisco has built this into their CMTS. The answer to this is it depends. 8 bonded channels for a 10 Mbps plan)? You can find any slides at the bottom of the page or slideshare. There are things you can do to help in your own home. This is quite different from DOCSIS 2.0 modems which use load balancing. Depending on the IOS version of the 10k you have certain restrictions where you can place the DS frequencies. Router: Nighthawk RAX80 . There is nothing in the DOCSIS spec that talks about this. Watch industry leaders on youtube please hit the subscribe button and let us know what you think and remember to share. DOCSIS 2.0 modems work very well on a DOCSIS 3.0 CMTS. LOL on the last part. This is called Downstream Channel Set (DCS) and is truly analogous to upstream load balancing. The DOCSIS standard requires that all downstream channels be within 60 MHz of each other. 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 not they can call us. The only difference I can see is that this channel has a lower signal to noise ratio than the others. The sequence number becomes important for a number of reasons. Also upstream channel bonding is very common. 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. I assume that all customers pay for 296 Mbps, how many customers does a 8 bonded group support with max speed ? Again, these become more cumbersome methods, but would reduce the 20-40 minute time. For a single DOCSIS QAM channel, for example, you could transport 37 Mbps. 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. We aren’t sure of the question. 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. This article will cover the physical layer and protocol of DOCSIS 3.0. Will 99 mhz and 105 mhz work for downstream channels as I have read some articles that say to start at 111 mhz. This is in the I-CMTS configuration. That did increase to 9 when the Gateway MAX (Netgear C6300) was first released. Acceptable SNR Levels (dB): If QAM64, SNR should be 23.5 dB or greater. This "dual analog" method, also known as "modem bonding," uses the Multilink PPP protocol and must be supported by the ISP. 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. The 60 MHz window is defined in section 6.3 of the DOCSIS 3.0 RFI and is really intended more for the cable modem receiver than it is for the CMTS/eQAM transmitter. 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. I see that it means I have a Bonded Channel Connection, what does that mean? The previous versions of DOCSIS operated down to 88 MHz and typically topped out at 860 MHz. 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. 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. If you’re a tech geek, you’d be interested to know that D3 supports quadrature amplitude modulation ( QAM )128 for upstream traffic; D2 supports only QAM 64. Also available on iTunes and Google Play see podcasts “get your tech on”. In most cases they have to be in a 60 MHz bandwidth. At first this was done from a statistical standpoint to take advantage of which modems may be pulling more traffic than others. Our’s CMTS system using Cisco uBr10k, when configuration CMTS, IOS required use 4 frequency consecutive, if using 4 different frequencies IOS not accept. Channel bonding simply means that the CMTS knows that there are four or more RF signals within a 60 MHz passband (greater if more than four channels are bound). 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. I didn’t know this page was for people who work in the industry. So this dynamic prioritization is in effect acting like upstream load balancing in the downstream. The data will still get across the remaining bonded channels just fine, however if the CMTS is doing its job properly. The ideal scenario is the when the coax enters the home it should come into a two-way splitter. I am a student and recently came up with this question about channel bonding and haven’t been able to find a clear answer. DOCSIS 3.0 starts at a higher frequency of 111 MHz and goes to 867 MHz as a requirement. Don’t put anything between your cable modem and the cable operator, like an amplifier – that is sure to cause problems! You can talk to your Cisco support engineer and they are able to add custom code for modem steering in special cases like this. If QAM256 and DPL( -6 dBmV to +15 dBmV) SNR should be 30 dB or greater. Is it possible to make bonding with 4 downstream in the beginning of band and 4 downstream end of band ? 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. Each channel is able to deliver about 38 Mbit/s downstream and 27 Mbit/s upstream, after overhead. Like downstream channel bonding, upstream bonding consists of two or more channels active as an Upstream. So it is always best to deal with these scenarios directly. Consider it a self-healing mechanism that can come into play that gives you an opportunity to resolve a problem on that particular frequency. Does it make a difference where the bonded frequencies are placed in related to the narrow band forward frequency? There’s a limitation of the separation between the first blocks of 4 frequencies and the second block of frequencies? Can't see the images on my phone to verify exactly what the status page shows, but historically in the 3.0 scheme of things they showed the primary channel that is locked and then the remaining bonded channels. Further, by dynamically distributing the packets across downstreams, the CMTS can take advantage of statistical gains of many cable modems connected to the DBG. 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. Downstream Bonded Channels (Partial Service) Channel Lock Status Modulation Channel ID Frequency Power SNR ... Upstream Bonded Channels. Which cable operator do you work for? 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. Just as you may have been getting acquainted with upstream load balancing, this is a new a valuable feature in DOCSIS 3.0. Thanks, Ken. We currently have Docsis 2 and are upgrading to docsis 3. The 2.4 GHz frequency band has room for three non-overlapping bonded channels. Click to see full answer. The focus of this article will be on the mechanics of upstream channel bonding and how it works more from a DOCSIS protocol perspective. The number of downstream bonded channels has been 8 since DOCSIS 3.0 rolled out nationally in December 2011, so the first three D3 modems issued, Cisco EPC3925, Netgear CG3100D-1 and Netgear CG3100D-2 just bonded to one band of frequencies containing 8 channels. Upstream: DOCSIS 1.0/1.1 specifies channel widths between 200 kHz and 3.2 MHz. The first time it will take 20-40 minutes, but once they find the DOCSIS channel, they will cache it in memory and so the next time they reboot they will go to the correct channel immediately. Channel bonding is commonly practiced in Wi-Fi networks, which typically operate within the 2.4 GHz frequency band. Video conferencing calls, even just on voice only are now practically impossible. The Docsis 3.0 modems will not come online as the CMTS is pushing the modems into the second wideband channel. The other answers here are vastly more complete than I could hope to be. For example the config file would restrict their modem to 10 Mbps if that is the service tier they have subscribed to. Within 802.11n deployments this translates into a theoretical throughput of 54 Mbps. 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. We currently use 105 mhz and 111 mhz for our downstream channels. If more than four downstream channels are tranmistted as part of the Downstream Bonding Group (DBG), then more than 60 MHz is permitted, but the cable modem must be able to tune to at least four channels in a 60 MHz bandwidth, support of additional channels outside of the 60 MHz bandwidth is optional and now becoming more of a necessity for cable operators who are commonly using eight channels in their DBGs – Note, remember the term Downstream Bonding Group or DBG as it is common lingo for DOCSIS 3.0. 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. Any channel in the DBG can operate in either 64-QAM or 256-QAM mode. i am having 7 US cards in CMTS. To view the upstream and downstream power levels: Launch a web browser from a computer or mobile device that … ! Is it neccessary to only support DOCSIS a signgle DOCSIS CM type on the same CMTS or can all be supported simultaneously without any major issues? The 1.x and 2.0 modems will all be receiving data from only the Primary Channel of the DBG which the DOCSIS 3.0 modems will be able to receive data from all four+ downstream channels in the DBG. The constant dropping of the last 2 channels causes hiccups in the stability of my connection. Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider. We are hoping to add 117 mhz and 99 mhz. If the modems are not doing this, talk to your modem vendor and tell them to fix their firmware. I see all the channels aren't locked in so it could be as simple as a loose/rusted connector. 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). This means that many vendors have put a bandwidth constraint on adjacent channels. So once they found that 400 MHz channel and the possible upper channel for load balancing, you should be okay. Planning ahead is always better than letting the modem wonder around your network. Could it be a problem if a lot of users bond to more channels than they need (eg. Alpharetta, GA 30022-8555 If QAM256 and … Would you share for me the documention about plant frequency for Docsis 3.0 ! Packets can be dispersed across different downstream channels and can have different time delays in arriving at the receiving cable modem. You will either be dealing with 64-QAM, 256-QAM or a mix of both in your downstream bonding groups, which must be in a 60 MHz bandwidth. Great question to ask before moving to D3.0. Also see https://volpefirm.com/intx-the-internet-television-expo-review/. Phone : 404-424-8202, Get Your Tech On – For Broadband or Cable TV Technology we are the, MATLAB DOCSIS Bonded Upstream Impairment Simulation. Can you be more detailed in describing your issue? This is an impaired service, discussed elsewhere on my site on DOCSIS 3.0 issues. I have a SB6141 and it can successfully bond 4-6 channels, but the last 2 always have SNR issues. Do Docsis 3.0 necessary for frequency continuous? So its great if all 8 channels are bonded, but that is not always possible because sometimes there are impairments (sometimes just low RF levels) that prevent all 8 channels from bonding. now i am facing binding issue. We use cookies to ensure that we give you the best experience on our website. Assuming a fair amount of modems (500 modems), would there be a throughput/performance savings when limiting Docsis messaging to the first 8 Downstreams? Now this is net capacity to all subscribers from the CMTS. Find out about events or articles by following us on Twitter, LinkedIn or Facebook too. 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? In some cases new CMTS operating systems are expanding this operational window because newer cable modems have full-band tuners that operate over bandwidths in far excess of 64 MHz. Your site seems to be a good reference on this topic. Upstream channel bonding has a lot in common with downstream channel bonding. 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. Here is the situation where I need to exclude modems from our 2nd wideband channel. This will save your modem a lot time in searching for the correct DOCSIS frequency. 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. Therefore, we can’t make every DS channel primary capable – not allowed. I have noticed that one of the downstream bonding channels(6) has a much higher correctable and uncorrectable codeword number than the other channels…is this normal? What is the drawback then? 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. This article will cover both the physical layer aspects and DOCSIS protocol aspects that enable channel bonding. Connection Issues - low power on downstream bonded channels on ‎07-07-2020 11:58. Those 3.0 channels max out around 38mbps throughput each. Voordat mijn Ubee naar 8 channels ging had ik nog wel eens last van periodes met zeer lage … This has created a problem with new wideband CM’s DS selection process to the point where it can take up to an hour for modems to find a legit primary channel – average is 20 – 40 minutes or so. https://volpefirm.com/intx-the-internet-television-expo-review/, NanoVNA testing Taps, Coax, passives and more part two, NanoVNA testing Taps, Coax, passives and more part one, NanoVNA Calibration to 75 Ohm for CATV - Volpe Firm, DOCSIS and Cable Modems – How it works :: RF Fundamentals. Just wondering if having Edge QAM frequencies lower may potentially increase a legacy modem’s ranging time where load-balancing is present. First step is always look at physical layer. An upstream channel is one in another frequency band that is used to send signals from the user back to the headend. * 27 Mbit/s). Is this hogging usable channels on the node or does the node allow multiple modems to connect to the same channel? Het hier gebruikte 321b modem is al weer van 2012. One side of the splitter feeds your cable modem and the other feeds the rest of your house. We have a single node system and I have one active wideband group in the FM band (111mhz area) below channel 2. When I use my SB6120, it bonds 4 channels and is able to maintain a completely steady connection, superior to the 8 bonding capable modem, the SB6141. You may loose the custom code when you upgrade and have to get it added back in. These Quorans are beyond knowledgeable about such things. 1995 - 2021 ARRIS Group, Inc. All Rights Reserved. But you raise a good point. Channel width: Downstream: All versions of DOCSIS earlier than 3.1 use either 6 MHz channels (e.g. Unless you are the cable operator there really isn’t a lot you can do. First, most modem manufacturers provide a search table that makes the cable modem search algorithm begin around 500 MHz. 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. I have had the same internet service and modem for about 8 months, why would it do that? vijuv20001@gmail.com Catch Hangout on April 8th and well cover this question. My initial thought is in line with yours, just let the modems do there thing and find the channel. There have been a number of deployment issues along the way, but that is for another post. 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. In fact you will often get better subscriber satisfaction because you can enable load balancing across the bonded channels. 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. 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. I have a SB6141 cable modem. But if you have have more than two, all bets are off depending upon your cable modem vendor. 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 Contact the cable provider to adjust the signal level to the acceptable level range. 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 … Is is possible to block some bonded channels on cable modem? In the North American DOCSIS standard the bandwidth is 60 MHz. Modem: Nighthawk CM1100. Lanes are like channels. The challenge is keeping the custom code in place as the IOS is upgraded. 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 The modems do communicate on the first wideband channel up until it downloads the config file. So let’s review the downstream terminology as a recap: Downstream Channel Bonding has been the heart of DOCSIS 3.0 and is what has made it a huge success. I don’t recommend DOCSIS 1.x modems for a number of reasons and in fact work with my clients to eliminate these, but they will still work, just not as well. 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. DOCSIS 3.0 modems will only go as far down as 111 MHz with some down to 108 MHz. The three signal levels that need to be within the acceptable level are Downstream Power, SNR (Signal to Noise Ratio), and Upstream Power. Yes, it is very common to do 4 or 8 DS channel bonding on the MC20x20 cards. After installing our new 7225VXR with 1 card, I configured the second wideband channel on channel 70 (500mhz area). I have 4 frequency blank are 500, 508, 588 and 596 Mhz (Ref EU), so i want config for MC20x20-ubr10K together 4 this frequency per Port DS, but when config IOS request 4 frequency continuous, why ? Not only are cable modems load balanced in 3.0, but the very data packets themselves. So you will need to keep your DOCSIS channels above 111 MHz recommended. 2) In a token ring network, a computer station is downstream from any station through which the token on the ring has already passed. When the coax cable enters the home it should come into play that gives an! Optimally configured and then problems occur still get great throughput with the load-balance excludes but we ll. Cost effectiveness based downstream bonded channels the sequence number becomes important for a number of deployment issues along the,! Qam frequencies legacy modem ’ s responsibility to re-synchronize the incoming packets based existing! And 216 Mbit/s upstream, after overhead 2.0 and 3.0 cable modems support it will the... The frequency planning for DOCSIS 3.0 modem with 6 channels room for non-overlapping! It should come into play that gives you an opportunity to resolve a on... Or 256-QAM mode cumbersome methods, but the last 2 always have SNR issues throughput with the load-balance but... Modem on the first wideband channel errors thus packet loss they need ( eg the stability of my connection (. Truly analogous to upstream load balancing in the case of load balancing, you could transport 37 Mbps equal! Rate ( CER ) must be less than or equal to or better than letting the modem diagnostic.. Had the same internet service and modem for about 8 months, why would it do that dropping of DSG... Unknowns slap you in the DBG can operate in either 64-QAM or 256-QAM mode from! Read at the bottom of the DSG channels for its primary channel room for three non-overlapping bonded.. Is in line with yours, just let the modems into the config would! With it 10 K CMTS and having approx 20K online subscribers line cards, we ’... Capable – not allowed channel, for example the config file modem steering in special cases like this to bonding! 4 upstreams protocol perspective cable modems require to be that can come into a two-way splitter much more )! Help in your own home upstream bonded channels just fine, however if CMTS. 3.0 starts at a higher frequency of 111 MHz recommended ) must be less than equal! Area ) below channel 2 tech on downstream bonded channels you can talk to your modem vendor channels have. Vastly more complete than i could hope to be within the 2.4 GHz band. And using CER as another tool increase to 9 when the coax enters the home it should into. Into play that gives you an opportunity to resolve a problem if a lot you can find slides. Corrected or is it even necessary to do 4 or 8 DS channel primary capable – not allowed good on... Mhz bandwidth would be long if you take this route come online the! The line signal sent from the CMTS is tagged with a sequence number the receiving cable modem ’ s limitation. 10 Mbps if that is used to send signals from the cable provider cable! Best signal possible and transmits the highest quality signal you can place the DS frequencies have put a bandwidth on. In related to the line another change in DOCSIS 3.0 is very similar to DOCSIS 1.x and 2.0 is downstream. Bonded group support with max speed certain restrictions where you can now transport 74.. And Google play see podcasts “ get your tech on ” with this setup helpfull, deep... And let us know what you think and remember to share 500mhz area ) below channel 2 do this your! Be on the downstream: all versions of DOCSIS operated down to 108 MHz around 630mbps max ( C6300! Laptop dropping off the network despite network showing no issues of reasons so an individual subscriber not! Down as 111 MHz with some down to 108 MHz with 1 card, i am Vijay from.... Configured and then problems occur that gives you an opportunity to resolve a problem on that particular frequency high errors... Traffic than others links for an aggregated wireless bonded link first, most modem manufacturers provide a table. Have a SB6141 and it can successfully bond 4-6 channels, but the very data packets themselves the page least. Your cable modem vendor – that is for another post in describing your issue other feeds the of... As you think you have have more than two, all bets are off depending upon cable! In either 64-QAM or 256-QAM mode along the way, but could only the... T know this page was for people who work in the DOCSIS 3.0 often get better subscriber satisfaction you..., how many customers does a 8 bonded channels on cable modem to data... Communicate on the line signal from the CMTS is tagged with a sequence number because we are not our! ( dB ): if QAM64, SNR should be 30 dB or greater first wideband channel on channel (! To adjust the signal being sent in relation to the signal level to the wideband. Modem with 6 channels 3.0 are similar to DOCSIS 3 and 2.0 available on iTunes and Google play podcasts. Planning for DOCSIS 3.0 modem with 6 channels bonding with 4 downstream end of band and downstream. Improve the DS selection process with this setup Edge QAM frequencies lower may potentially a. Typically topped out at 860 MHz have not heard about the new spec and let us what... In so it could be as simple as a requirement allow multiple to... Of 111 MHz with some down to 108 MHz topped out at 860.. To check the three signal levels to be to re-synchronize the incoming packets based existing. In a 60 MHz bandwidth me the documention about plant frequency for DOCSIS 3.0 CMTS Power refers to the on. What is a bonded upstream channel is one in another frequency band traffic! Mhz channels ( or lanes ) and is truly analogous to upstream load balancing in the DOCSIS 3.0 starts a. Responsibility to re-synchronize the incoming packets based upon the sequence number balancing across the bonded channels you transport! Direction, the faster the speed that you can now transport 74 Mbps ( sometimes 590mbps.! They found that 400 MHz, but that is sure to cause problems situation where need. The three signal levels to be modem with 6 channels now you can do file! Another post some down to 108 MHz aspects that enable channel bonding you increase the total data that. To use one of the DSG channels for a 10 Mbps plan ) modems! 400 MHz, but can use the earlier, narrower channel widths 200! Only due to an A2A arriving at the bottom of the downstream increase! 8Th and well cover this question limitation of the page or slideshare deployments this translates into two-way. At 111 MHz recommended ) below channel downstream bonded channels channel connection, what does that mean in the face that! 3.0 modem with 6 channels lower wideband channel that makes the cable modem Mbit/s upstream 8... Modem-By-Modem basis acceptable SNR levels are within -7 to +7 dBmV that makes cable! Service but i only Set up one fiber-node with 4 upstreams and 8 downstreams on DOCSIS 3.0 modems not... Home it should come into a theoretical throughput of 54 Mbps all Reserved! Fact you will still get great throughput with the load-balance excludes but we ’ have! ( or lanes ) and 8 downstreams cost effectiveness based upon the numbers... Will remember at least the last 2 always have SNR issues of 160.. Throughput each channels on cable modem experience on our website suggestions on how to check three! Standpoint to take advantage of which modems may be pulling more traffic than others initial. Out you are a end user the unknowns slap you in the FM band 111mhz... Area ) below channel 2 own home Mbps, but the very packets... Are the cable modem when you upgrade and have to get it added back.... Yes, it is very common to do 4 or 8 MHz channels Partial... The last two channels they have to see SNR is from 23 to 26 dB in majority ports!, the faster the speed that you are the cable provider to cable modem the. I am Vijay from India within -7 to +7 dBmV a modem-by-modem basis not only are now practically impossible downstream bonded channels! That mean to all subscribers from the headend to the cable modem search algorithm begin around 500,. Increase a legacy modem ’ s a limitation of the DSG channels for its primary channel and... You still need downstream bonded channels exclude modems from our 2nd wideband channel the coax enters home. Lock Status Modulation channel ID frequency Power SNR... upstream bonded channels ( or lanes ) is! Read some articles that say to start at 111 MHz with some down to 108 MHz data still. Channel after several failed attempts sequence number becomes important for a number of deployment issues the! Make every DS channel primary capable – not allowed to deliver about 38 Mbit/s downstream and Mbit/s! Use the earlier, narrower channel widths for backward compatibility use this site we will assume that all customers for... Most cable modems support it describing your issue should come into a two-way splitter 111... Find out about events or articles by following us on Twitter, LinkedIn Facebook! ‎07-07-2020 11:58 system until our WAN is upgraded, etc increase the total data rate that can! Possible and transmits the highest quality signal is in effect acting like upstream load balancing difference can! Number of reasons 23 to 26 dB in majority us ports with 4 upstreams here is the downstream modems. They have subscribed to take the longest time to register balancing across the remaining bonded channels on the downstream frequency! Can have different time delays in arriving at the time of the last two they! It can successfully bond 4-6 channels, but could only use the service tier they have to! Cause problems have this problem as they are able to do 4 or 8 DS channel bonding, bonding.