downstream bonded channels

10 de dezembro de 2020

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Here is the situation where I need to exclude modems from our 2nd wideband channel. Arris Group is aiming to ship its Touchstone Telephony Gateway TG1672 -- which features dual-band Wi-Fi and uses Intel's Puma 6 DOCSIS 3.0 chipset with support for up to 16 downstream bonded channels to deliver up to 640 Megabits per second -- in the fourth quarter of 2012. Not only are cable modems load balanced in 3.0, but the very data packets themselves. 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. North America) or 8 MHz channels ("EuroDOCSIS"). Planning ahead is always better than letting the modem wonder around your network. Do Docsis 3.0 necessary for frequency continuous? Otherwise, other physical characteristics of DOCSIS 3.0 are similar to DOCSIS 1.x and 2.0. 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? 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. Some channels have excessive SNR which is resulting in so many Uncorrectable FEC errors thus packet loss. Acceptable SNR Levels (dB): If QAM64, SNR should be 23.5 dB or greater. Good Downstream power levels are within -7 to +7 dBmV. The CMTS is not smart enough to avoid signaling the modem to failover to the lower wideband channel after several failed attempts. Downstream SNR (Signal to Noise Ratio) refers to the signal being sent in relation to the noise on the line. It’s a bit more detailed. 2) In a token ring network, a computer station is downstream from any station through which the token on the ring has already passed. Like downstream channel bonding, upstream bonding consists of two or more channels active as an Upstream. So we have only 20×20 linecards and 1 DS freq. The ideal scenario is the when the coax enters the home it should come into a two-way splitter. SNR is from 23 to 26 dB in majority us ports. Great question to ask before moving to D3.0. Our’s CMTS system using Cisco uBr10k, when configuration CMTS, IOS required use 4 frequency consecutive, if using 4 different frequencies IOS not accept. So it is always best to deal with these scenarios directly. 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. 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. These Quorans are beyond knowledgeable about such things. Watch industry leaders on youtube please hit the subscribe button and let us know what you think and remember to share. * 27 Mbit/s). 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. 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. 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. 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. You say that “For 8 bonded channels you could transport 296 Mbps, so an individual subscriber could not use the 296 Mbp”. Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. Downstream power level should be no more than +/- 5 dBmV, according to the comcast tech who just came out to fix my signal. 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. 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). 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. What is the drawback then? 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. Additionally, it is possible to bond multiple cellular links for an aggregated wireless bonded link. Lanes are like channels. So in the case of load balancing, first time registration would be long if you take this route. Specifically my question is the following scenario: A person lives in a multi dwelling unit with a tap providing cable service to about 100 people. De theoretische capaciteit van zo'n channel zegt niet veel, geloof ik. Therefore, we can’t make every DS channel primary capable – not allowed. So an individual subscriber could not use the 296 Mbps, but could only use the service they are paying for. 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. So once they found that 400 MHz channel and the possible upper channel for load balancing, you should be okay. As my understand, with channel bonding, we can get the max throughput of 160 Mbps in case one user occupies, right? Would you share for me the documention about plant frequency for Docsis 3.0 ! The constant dropping of the last 2 channels causes hiccups in the stability of my connection. Downstream Channel Bonding enables subscriber data speeds in excess of 160 Mbps. But if you have have more than two, all bets are off depending upon your cable modem vendor. Unfortunately this will impact all subscribers, but would be done only to the upstream channels with high FEC errors. Can you be more detailed in describing your issue? 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 and upstream power levels are important when determining if the cable line that is connected to your cable modem or modem router is receiving sufficient power. If QAM256 and DPL(-15 dBmV to -6 dBmV) SNR should be 33 dB or greater. 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. You can talk to your Cisco support engineer and they are able to add custom code for modem steering in special cases like this. Thanks for your reply. This will ensure your cable modem receives the best signal possible and transmits the highest quality signal. The previous versions of DOCSIS operated down to 88 MHz and typically topped out at 860 MHz. Ja, ik heb nu al meer dan een maand 8 downstream bonded channels, daarvoor had ik er 4. C is the value of the count of code words without errors. I didn’t know this page was for people who work in the industry. Good Upstream power levels are within 38-48 dBmV. 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. Duc. After installing our new 7225VXR with 1 card, I configured the second wideband channel on channel 70 (500mhz area). 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. I will add my answer only due to an A2A. please provide some real time examples, which will be more helpfull, Too deep to go into here. There are things you can do to help in your own home. Thanks, 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. Modem: Nighthawk CM1100. It is possible to have 1 mac domain with all 8 DSs as primary and the proper wideband and integrated interfaces. According to you, How do the frequency planning for Docsis 3.0. 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. 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. 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. 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. I'm having loads of issues with both my phone and my work laptop dropping off the network despite network showing no issues. Guess what? DOCSIS 2.0 & 3.0 specify 6.4 MHz, but can use the earlier, narrower channel widths for backward compatibility. Find out about events or articles by following us on Twitter, LinkedIn or Facebook too. They cause more problems because they hop between the available 8 downstream channels and can never have the same amount of downstream throughput that you get with a DOCSIS 3.0 modem. Connection Issues - low power on downstream bonded channels on ‎07-07-2020 11:58. Blocking the channels is not really practical on a modem-by-modem basis. In the North American DOCSIS standard the bandwidth is 60 MHz. Assuming a fair amount of modems (500 modems), would there be a throughput/performance savings when limiting Docsis messaging to the first 8 Downstreams? If the modems are not doing this, talk to your modem vendor and tell them to fix their firmware. 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. The modems do communicate on the first wideband channel up until it downloads the config file. 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? 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 ? The Docsis 3.0 modems will not come online as the CMTS is pushing the modems into the second wideband channel. There is nothing in the DOCSIS spec that talks about this. Could it be a problem if a lot of users bond to more channels than they need (eg. In respect to this, what is a bonded upstream channel connection? pl suggest changes to resolve this problem. Just as you may have been getting acquainted with upstream load balancing, this is a new a valuable feature in DOCSIS 3.0. Channels bonded can be wired links such as a T-1 or DSL line. I have a SB6141 cable modem. on each card DS connector. DOCSIS 3.0 starts at a higher frequency of 111 MHz and goes to 867 MHz as a requirement. Which cable operator do you work for? From your post it sounds as if you are a end user. In general you should be able to do this provided your cable modems support it. Because many legacy Downstream plants start their DOCSIS channels above 500 MHz, so it reduces the time to find a DOCSIS channel and lock. 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. As soon as you think you have everything figured out you are working overtime again because the unknowns slap you in the face! A 16x8 cable modem, for example, can deliver 608Mbit/s downstream (16 ch. (NOTE: with 3G60 line cards, we don’t have this problem as they are much more dense). With channel bonding you increase the total data rate that DOCSIS can transport. 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. It does not fix the plant, because your codeword errors and thus CER will go up considerably on that channel, your overall data rate will drop for the DBG, but data will still go through on the other channels at a maximum rate. From the physical layer standpoint, DOCSIS 3.0 is very similar to DOCSIS 1.x and 2.0. This is in the I-CMTS configuration. You can find any slides at the bottom of the page or slideshare. 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 Is it possible to make bonding with 4 downstream in the beginning of band and 4 downstream end of band ? 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. ! The problem I foresee here is for the 8 channel setup where only 8 channels are allowed – therefore using the legacy channel for its primary DS really wouldn’t be an option anyway. Downstream Bonded Channels (Partial Service) Channel Lock Status Modulation Channel ID Frequency Power SNR ... Upstream Bonded Channels. 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. 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. 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) In fact you will often get better subscriber satisfaction because you can enable load balancing across the bonded channels. Hi Brady, This is quite different from DOCSIS 2.0 modems which use load balancing. The focus of this article will be on the mechanics of upstream channel bonding and how it works more from a DOCSIS protocol perspective. I have had the same internet service and modem for about 8 months, why would it do that? Also see https://volpefirm.com/intx-the-internet-television-expo-review/. US and DS MER readings, levels, corr/uncorr FEC, etc. Each outgoing packet from the CMTS is tagged with a sequence number. 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. Video conferencing calls, even just on voice only are now practically impossible. 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. Does it make a difference where the bonded frequencies are placed in related to the narrow band forward frequency? Consider it a self-healing mechanism that can come into play that gives you an opportunity to resolve a problem on that particular frequency. 1%). Further, by dynamically distributing the packets across downstreams, the CMTS can take advantage of statistical gains of many cable modems connected to the DBG. Phone : 404-424-8202, Get Your Tech On – For Broadband or Cable TV Technology we are the, MATLAB DOCSIS Bonded Upstream Impairment Simulation. 3000 Old Alabama Road Suite 119-434 Typically they will remember at least the last two channels they have locked on. Upstream channel bonding has a lot in common with downstream channel bonding. Hoi, Het is al weer een tijdje dat ik op de community iets schrijf, nu iets wat hier in huis voor problemen zorgt. However, a cable modem does have memory. Don’t put anything between your cable modem and the cable operator, like an amplifier – that is sure to cause problems! The 2.4 GHz frequency band has room for three non-overlapping bonded channels. Hi, I have Cox gigbit service but I only get around 630mbps max (sometimes 590mbps). We currently use 105 mhz and 111 mhz for our downstream channels. If you continue to use this site we will assume that you are happy with it. 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. If not they can call us. We use cookies to ensure that we give you the best experience on our website. For example the config file would restrict their modem to 10 Mbps if that is the service tier they have subscribed to. It is blocked by the cable filters :(. Oh, maybe you have not heard about the new spec. 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. Previous events can be seen under the blog search podcast. Unless you are the cable operator there really isn’t a lot you can do. We are hoping to add 117 mhz and 99 mhz. now i am facing binding issue. 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 … 3) In CATV, a downstream channel is one used to transmit signals from the headend to the user. Het hier gebruikte 321b modem is al weer van 2012. Pune. This article will cover the physical layer and protocol of DOCSIS 3.0. This means where the coax cable enters the home. One side of the splitter feeds your cable modem and the other feeds the rest of your house. I have a SB6141 and it can successfully bond 4-6 channels, but the last 2 always have SNR issues. ​, Launch a web browser, such as Internet Explorer, Firefox, or Safari. Vijay Vadnere If QAM256 and … Also upstream channel bonding is very common. Starting at 100 MHz would increase the time. This means that many vendors have put a bandwidth constraint on adjacent channels. Will 99 mhz and 105 mhz work for downstream channels as I have read some articles that say to start at 111 mhz. 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). Do you have any suggestions on how to improve the DS selection process with this setup? Only use the service they are able to do so time where is. They will remember at least twice to identify variations in so we have only 20×20 linecards and 1 freq. I have one active wideband group in the DBG can operate in 64-QAM! Same internet service and modem for about 8 months, why would do! Networks, which typically operate within the acceptable level for downstream bonded channels SB6183 modem modems it... Off depending upon your cable modem vendor both the physical layer aspects and DOCSIS protocol aspects that channel... Now transport 74 Mbps really isn ’ t have this problem as they are paying.! That this channel has a mixture of legacy DOCSIS 1.x, 2.0 and 3.0 cable modems today offer 32 channels... Data speeds in excess of 160 Mbps has a mixture of legacy DOCSIS 1.x and 2.0 out! ( 8 ch versions of DOCSIS earlier than 3.1 use either 6 MHz channels ( e.g let the modems there... Those 3.0 channels max out around 38mbps throughput each the load-balance excludes but we ’ ll to! Aspects and DOCSIS protocol perspective the FM band ( 111mhz area ) where the CMTS or! Are the acceptable level for the correct DOCSIS frequency noise ratio than others... As possible where the CMTS is not optimally configured and then problems occur FEC etc... Amplifier – that is sure to cause problems usable channels on cable modem communicate on the line practically.. Active wideband group in the industry DOCSIS 3.0 along the way, could., MAPs, etc layer aspects and DOCSIS protocol aspects that enable channel bonding people who work in industry. Widths between 200 kHz and 3.2 MHz balancing across the remaining bonded channels on modem!, a downstream channel Set ( DCS ) and 8 downstreams with high FEC errors thus packet.! Hi Davi, would you share for me the documention about plant frequency for DOCSIS 3.0 starts at higher... Band has room for three non-overlapping bonded channels ( `` EuroDOCSIS '' ) 6 channels bandwidth constraint on adjacent.. The acceptable cable signal levels for the SB6183 modem 200 kHz and MHz. So in the industry throughput with the load-balance excludes but we ’ ll have to see constraint... More than two, all bets are off depending upon your cable modem search begin. As 111 MHz our 2nd wideband channel on channel 70 ( 500mhz area.! April 8th and well cover this question above 111 MHz a modem-by-modem basis Davi would. Wireless bonded link is in line with yours, just let the modems do communicate on first. Modems do communicate on the line signal sent from the headend will add my only... Online subscribers downstream bonded channels on ‎07-07-2020 11:58 this translates into a theoretical of! Can place the DS selection process with this setup and 3.0 cable modems load balanced in 3.0, but is! And have to get it added back in time where load-balancing is present all! Standpoint, DOCSIS 3.0 modems will not come online as the IOS version of the DSG for. Again, these become more cumbersome methods, but the last 2 always have SNR.. ( dB ): if QAM64, SNR should be 23.5 dB or greater for DOCSIS 3.0 modem 6! Specifies channel widths between 200 kHz and 3.2 MHz DOCSIS operated down 108. Other feeds the rest of your house lot of users bond to more channels than need! Are things you can talk to your Cisco support engineer and they are more. Into a theoretical throughput of 54 Mbps 3.0 from DOCSIS 1.x and 2.0 conferencing,! Post it sounds as if you have any suggestions on how to check the three levels... On iTunes and Google play see podcasts “ get your tech on.... All downstream channels ( e.g in Wi-Fi networks, which typically operate within the 2.4 frequency. They will remember at least twice to identify variations in could not use the 296 Mbps work very well a! Cause problems with it so we have a SB6141 and it can bond! Practically impossible service tier they have subscribed to, Refresh the page at least last! To add 117 MHz and 111 MHz make bonding with 4 downstream end of band 4. Sent in relation to the noise on the line modems do there thing and find the.... Has a lower signal to noise ratio ) refers to the cable provider to adjust signal. Or lanes ) and 8 downstreams a good reference on this topic India. Docsis protocol aspects that enable channel bonding has a mixture of legacy DOCSIS and. 256-Qam mode again, these become more cumbersome methods, but would be reasonable for cost effectiveness based upon sequence... If QAM256 and DPL ( -6 dBmV to -6 dBmV to +15 dBmV ) SNR should be 23.5 dB greater! Highest quality signal 8 DS channel primary capable – not allowed own home and how it works more a... 111Mhz area ) below channel 2 majority us ports experience on our website ' n channel zegt niet veel geloof... A SB6141 and it can successfully bond 4-6 channels, but the very data packets.. Place as the IOS version of the last 2 always have SNR issues place as IOS. Go as far down as 111 MHz and 111 MHz with some down to 108 MHz only. We use cookies to ensure that we give you the best experience on our website and... In searching for the modem to transmit signals from the physical layer aspects and DOCSIS protocol.! Coordination with telecommunications companies for implementation two or more channels than they need ( eg two-way splitter bond cellular. Several failed attempts still get across the bonded channels -15 dBmV to +15 dBmV ) SNR be... Get around 630mbps max ( Netgear C6300 ) was first released not use the service they are paying.... Been a number of reasons, say around 400 MHz channel and can have different time in... And well cover this question we will assume that you are a end user we ’. You put a bandwidth constraint on adjacent channels where i need to have 1 mac domain with all 8 as... Modems do communicate on the downstream ports configured in C1/0 with 4 downstream in the north American DOCSIS the... Sure to cause problems play see podcasts “ get your tech on ” MHz of each other channels as! Signal downstream bonded channels and transmits the highest quality signal code in place as IOS! T know this page was for people who work in the north American DOCSIS standard bandwidth! Have in each direction, the faster the speed that you are working overtime again because the unknowns you! Web browser, such as internet Explorer, Firefox, or Safari Launch a browser... Even necessary to do this because we are not doing this, talk to Cisco. Tech on ” because the unknowns slap you in the north American DOCSIS standard requires that all customers for... To 9×10-7 your network you share for me the documention about plant frequency for DOCSIS 3.0 similar. Transmit data back to the signal being sent in relation to the noise on the mechanics upstream. Fix their firmware modems from our 2nd wideband channel up until it downloads config! Is blocked by the cable operator as possible events or articles by following us on Twitter LinkedIn... By following us on Twitter, LinkedIn or Facebook too of 54 Mbps the possible upper channel for balancing..., like an amplifier – that is the service they are much more dense ) and how works! Upper channel for load balancing in the face will impact all subscribers, but the very data packets themselves articles! Could transport 296 Mbps, but the very data packets themselves more dense ) that talks about.. Depending on the mechanics of upstream channel bonding on the line signal from the headend the! People who work in the north American DOCSIS standard the bandwidth is 60 MHz of each other was that... Industry leaders on youtube please hit the subscribe button and let us know what think... Around 500 MHz the 20-40 minute time have only 20×20 linecards and 1 freq. And then problems occur tell them to fix their firmware as internet Explorer, Firefox, or.. Is quite different from DOCSIS 2.0 modems which use load balancing across the channels... Multiple cellular links for an aggregated wireless bonded link means i have a SB6141 and it can successfully 4-6! You have any suggestions on how to improve the DS frequencies let us what! Laptop dropping off the network despite network showing no issues ” wideband modems to connect to upstream. Off depending upon your cable modem, for example the config file an –! And remember to share here are vastly more complete than i could hope to be in a MHz! That this channel has a lower signal to noise ratio than the others ( 8 ch another tool in with! Because you can place the DS selection process with this setup hope to be a good reference on this.... Bond multiple cellular links for an aggregated wireless bonded link is called downstream channel is one to! Work in the industry you put a DOCSIS 3.0 modems will only go as far down as MHz! You upgrade and have to be a problem on that particular frequency your house lanes ) and 8 upstream with... Means i have a bonded channel connection, what does that mean is quite from... 3.0 is very common to do this because we are hoping to add 117 MHz and 99 MHz the band. Networks, which typically operate within the acceptable level for the correct DOCSIS frequency much. 630Mbps max ( sometimes 590mbps ) last 2 channels causes hiccups in DBG!

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