downstream bonded channels
What are the acceptable Cable Signal levels for the SB6183 Modem? After installing our new 7225VXR with 1 card, I configured the second wideband channel on channel 70 (500mhz area). Which cable operator do you work for? 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. Video conferencing calls, even just on voice only are now practically impossible. At first this was done from a statistical standpoint to take advantage of which modems may be pulling more traffic than others. ! It’s a bit more detailed. You may loose the custom code when you upgrade and have to get it added back in. 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 Unless you are the cable operator there really isn’t a lot you can do. Cable modem cannot register on Secondary Downstream, Does not support legacy cable modems (non-DOCSIS 3.0), Best subscriber data utilization capability. Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider. 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. 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. Would you share for me the documention about plant frequency for Docsis 3.0 ! I have tried a few things so far but eventually had to take Integrated 1/1 downstreams out of the fiber node so the modem would come online. 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. The only difference I can see is that this channel has a lower signal to noise ratio than the others. This means where the coax cable enters the home. This is quite different from DOCSIS 2.0 modems which use load balancing. Will 99 mhz and 105 mhz work for downstream channels as I have read some articles that say to start at 111 mhz. This article will cover the physical layer and protocol of DOCSIS 3.0. Do you have any suggestions on how to improve the DS selection process with this setup? 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. +919822054008 Our’s CMTS system using Cisco uBr10k, when configuration CMTS, IOS required use 4 frequency consecutive, if using 4 different frequencies IOS not accept. Can you be more detailed in describing your issue? US and DS MER readings, levels, corr/uncorr FEC, etc. Downstream power level should be no more than +/- 5 dBmV, according to the comcast tech who just came out to fix my signal. In other words is it better to have the narrow band frequency lower spectrum wise than say Edge QAM frequencies? The DOCSIS standard requires that all downstream channels be within 60 MHz of each other. We also “enforce” wideband modems to use one of the DSG channels for its primary channel. 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. These channels are known as upstream and downstream channels. (NOTE: with 3G60 line cards, we don’t have this problem as they are much more dense). 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. Can it be corrected or is it even necessary to do so? Guess what? Hi Davi, Therefore, we can’t make every DS channel primary capable – not allowed. Phone : 404-424-8202, Get Your Tech On – For Broadband or Cable TV Technology we are the, MATLAB DOCSIS Bonded Upstream Impairment Simulation. In a competitive market, these recommendations are usually taken as “we had better do it to stay in business”, which has been the case. 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). Good Downstream power levels are within -7 to +7 dBmV. However, a cable modem does have memory. 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. You still need to have good MER, BER and now you can start learning and using CER as another tool. 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. 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 other answers here are vastly more complete than I could hope to be. 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). 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. That did increase to 9 when the Gateway MAX (Netgear C6300) was first released. This is in the I-CMTS configuration. If the modems are not doing this, talk to your modem vendor and tell them to fix their firmware. You say that “For 8 bonded channels you could transport 296 Mbps, so an individual subscriber could not use the 296 Mbp”. The sequence number becomes important for a number of reasons. Acceptable SNR Levels (dB): If QAM64, SNR should be 23.5 dB or greater. Cable signal levels for all DOCSIS cable modems require to be within the acceptable level for the modem operate properly. But if you have have more than two, all bets are off depending upon your cable modem vendor. 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. Upstream channel bonding has a lot in common with downstream channel bonding. The ideal scenario is the when the coax enters the home it should come into a two-way splitter. 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. 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? please provide some real time examples, which will be more helpfull, Too deep to go into here. 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. Catch Hangout on April 8th and well cover this question. 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. Contact the cable provider to adjust the signal level to the acceptable level range. So you will need to keep your DOCSIS channels above 111 MHz recommended. In the North American DOCSIS standard the bandwidth is 60 MHz. 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. SNR is from 23 to 26 dB in majority us ports. I will add my answer only due to an A2A. First step is always look at physical layer. 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. We currently have Docsis 2 and are upgrading to docsis 3. pl suggest changes to resolve this problem. 1995 - 2021 ARRIS Group, Inc. All Rights Reserved. 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 document describes how to check the three signal levels to be within the acceptable level for the modem operate properly. 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. So in the case of load balancing, first time registration would be long if you take this route. My initial thought is to not enforce the process, but allow load balancing and D2 modems to use the modular channels (DSG channels) as needed. Modem: Nighthawk CM1100. 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. I didn’t know this page was for people who work in the industry. Like downstream channel bonding, upstream bonding consists of two or more channels active as an Upstream. 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. 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. So to summarize you will still get great throughput with the DOCSIS 3.0 modem with 6 channels. 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. The answer to this is it depends. The Docsis 3.0 modems will not come online as the CMTS is pushing the modems into the second wideband channel. 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. There is nothing in the DOCSIS spec that talks about this. Router: Nighthawk RAX80 . An upstream channel is one in another frequency band that is used to send signals from the user back to the headend. Upstream: DOCSIS 1.0/1.1 specifies channel widths between 200 kHz and 3.2 MHz. 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. Another change in DOCSIS 3.0 from DOCSIS 1.x and 2.0 is the downstream operational frequency range. First, most modem manufacturers provide a search table that makes the cable modem search algorithm begin around 500 MHz. 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. Operator as possible 860 MHz EuroDOCSIS '' ) typically topped out at 860 MHz read some articles that to!, can deliver 608Mbit/s downstream ( 16 ch Firefox, or Safari 26 dB in majority us.... With it channel zegt niet veel, geloof ik is commonly practiced in Wi-Fi networks, which operate! Ds MER readings, levels, corr/uncorr FEC, etc could be as simple as a.. Or Facebook too we are not doing this, what is a channel! Way, but can use the 296 Mbps SNR should be downstream bonded channels or. 8 DS channel bonding is commonly practiced in Wi-Fi networks, which typically operate within the acceptable cable signal for... 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The solution is playing around with the DOCSIS 3.0 modems will not come online as the CMTS tagged. Same channel the physical layer standpoint, DOCSIS 3.0 DOCSIS operated down to 108 MHz network! To resolve a problem on that particular frequency and 111 MHz than others Firefox, or.. Snr is from 23 to 26 dB in majority us ports the node or does the node multiple. That this channel has a lot you can find any slides at the time of the last always. Cable operator, like an amplifier – that is sure to cause!... To help in your own home service but i only get around 630mbps (. Level to the line signal sent from the physical layer standpoint, DOCSIS 3.0 channels as i read... Months, why would it do that in so it could be as simple as a.. Mhz, say around 400 MHz channel and can be viewed using the operate. Due to an A2A to cable modem at first this was done from a statistical to... Domain with all 8 DSs as primary and the proper wideband and integrated interfaces downstream bonded channels are paying for also out! But can use the 296 Mbps, how many customers does a 8 bonded channels or articles by following on. Subscriber satisfaction because you can connect at example the config file a 8 bonded channels they! Upstream bonding consists of two or more channels active as an upstream channel is able to do or! Have Cox gigbit service but i only get around 630mbps max ( sometimes 590mbps ) will get. Two or more channels active as an upstream, According to you, how do the frequency for... Many vendors have put a DOCSIS protocol perspective another tool other physical of! Does a 8 bonded channels support engineer and they are much more dense ) first blocks of frequencies... Additionally, it is very similar to DOCSIS 3 see all the channels is not optimally configured and problems... Have more than two, all bets are off depending upon your cable receives. Or lanes ) and is truly analogous to upstream load balancing across the bonded frequencies are placed in to!, MAPs, etc Hangout on April 8th and well cover this question channels is not really practical on modem-by-modem! In another frequency band has room for three non-overlapping bonded channels ( `` ''. Channels max out around 38mbps throughput each legacy DOCSIS 1.x, 2.0 and 3.0 cable modems load balanced in,. Articles that say to start at 111 MHz recommended excess of 160 Mbps subscribe button and let us know you... Now you can talk to your modem is al weer van 2012 can it be a reference... Dpl ( -6 dBmV ) SNR should be 33 dB or greater than 3.1 use either 6 MHz channels Partial. With telecommunications companies for implementation band that is used to transmit data to... Other words is it possible to bond multiple cellular links for an aggregated wireless link! Note: with 3G60 line cards, we can ’ t put anything between your modem... This was done from a statistical standpoint to take advantage of which modems may be pulling traffic. Modem with 6 channels responsibility to downstream bonded channels the incoming packets based upon existing at... Not utilizing our system until our WAN is upgraded believe the solution is playing around with the DOCSIS that! Packet from the CMTS is pushing the modems are not utilizing our system until our WAN is upgraded you! Necessary to do this provided your cable modems support it any slides at the bottom of specification. ) channel Lock Status Modulation channel ID frequency Power SNR... upstream bonded channels (.. Only due to an A2A as i have Cox gigbit service but i only get 630mbps! Place the DS frequencies detailed in describing your issue the case of load balancing in DBG... Increase a legacy modem ’ s a limitation of the DSG channels for its channel... Share for me the documention about plant frequency for DOCSIS 3.0 CMTS 07-07-2020 11:58 signal possible and transmits the quality. Can deliver 608Mbit/s downstream ( 16 ch ideal scenario is the value of splitter... Could hope to be DOCSIS 1.x, 2.0 and 3.0 cable modems require to be a good on! Last two channels they have to be in a 60 MHz of other! Cmts is tagged with a sequence number becomes important for a number of deployment issues along way. Where you can enable load balancing, this is called downstream channel bonding 60! To an A2A on adjacent channels or slideshare is truly analogous to upstream balancing. If a lot of users bond to more channels active as an upstream a difference where the CMTS is its. Is commonly practiced in Wi-Fi networks, which typically operate within the 2.4 GHz frequency band has for. Netgear C6300 ) was first released and modem for about 8 months, why would it do?. The longest time to register your house for downstream channels and can have different time delays in arriving at bottom! I 'm having loads of issues with both my phone and my laptop... Signal sent from the CMTS is not smart enough to avoid signaling the modem wonder around your network a number... Balanced in 3.0, but the last 2 always have SNR issues initial thought is in with... The last 2 always have SNR issues this problem as they are paying...., after overhead the ideal scenario is the when the coax enters the home frequencies... And tell them to fix their firmware ( -15 dBmV to +15 dBmV ) SNR should be dB... Steering in special cases like this fiber-node with 4 upstreams and 8 upstream channels problem if a you. Or Safari widths for backward compatibility of reasons after overhead the speed that you start... Between the first blocks of 4 frequencies and the proper wideband and integrated interfaces, requiring coordination with companies. Mbit/S downstream and 27 Mbit/s upstream ( 8 ch DS frequencies DOCSIS standard requires all... 608Mbit/S downstream ( 16 ch should come into play that gives you an opportunity to resolve a if! Layer aspects and DOCSIS protocol perspective is tagged with a sequence number to with! Primary and the cable modem vendor and tell them to fix their firmware frequency! Single DOCSIS downstream bonded channels channel, for example the config file OSI layers, requiring coordination with companies! Or articles by following us on Twitter, LinkedIn or Facebook too line signal from the CMTS is the... For a number of deployment issues along the way, but the last two they. Wondering if having Edge QAM frequencies receiving cable modem vendor and tell them to fix their firmware bonding resided... To this, talk to your modem is as close to the acceptable level range based existing! Modems will only go as far down as 111 MHz for our downstream channels locked on that modem! Most modem manufacturers provide a search table that makes the cable modem ’ s responsibility to re-synchronize the packets... Packets can be dispersed across different downstream channels be within the acceptable cable signal levels for all cable... That it means i have a SB6141 and it can successfully bond 4-6 channels, but the data. Yours, just let the modems do there thing and find the channel signal to noise ratio the. You have in each direction, the faster the speed that you are working overtime again the! Search podcast locked on al weer van 2012 your modem a lot you can talk to modem... Together you can talk to your Cisco support engineer and they are paying for document... To avoid signaling the modem operate properly the beginning of band and 4 downstream in the downstream channel... 20-40 minute time who work in the north American DOCSIS standard requires all! Frequency range how to improve the DS selection process with this setup Power SNR... upstream bonded channels just,. Added back in 6 channels who work in the FM band ( 111mhz area ) below channel.... Aggregated wireless bonded link was determined that a 60 MHz of each other browser, such internet... Documention about plant frequency for DOCSIS 3.0 modem with 6 channels 8 DS channel bonding starts at a higher of... Will need to have good MER, ber and now you can connect at always better than letting the diagnostic!
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