Also check out https://volpefirm.com/intx-the-internet-television-expo-review/, I am Vijay from India. ! 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. But you raise a good point. Enter, Refresh the page at least twice to identify variations in. We currently have Docsis 2 and are upgrading to docsis 3. Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider. De theoretische capaciteit van zo'n channel zegt niet veel, geloof ik. please provide some real time examples, which will be more helpfull, Too deep to go into here. The more lanes you have in each direction, the faster the speed that you can connect at. Duc. India 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. Also available on iTunes and Google Play see podcasts “get your tech on”. Click to see full answer. Is is possible to block some bonded channels on cable modem? 3) In CATV, a downstream channel is one used to transmit signals from the headend to the user. Additionally, it is possible to bond multiple cellular links for an aggregated wireless bonded link. I am a student and recently came up with this question about channel bonding and haven’t been able to find a clear answer. In most cases they have to be in a 60 MHz bandwidth. If QAM256 and … The challenge is keeping the custom code in place as the IOS is upgraded. The Docsis 3.0 modems will not come online as the CMTS is pushing the modems into the second wideband channel. This is quite different from DOCSIS 2.0 modems which use load balancing. At first this was done from a statistical standpoint to take advantage of which modems may be pulling more traffic than others. 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. 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 Most cable modems today offer 32 downstream channels (or lanes) and 8 upstream channels. All DS from each card combined. 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 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. 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 First, most modem manufacturers provide a search table that makes the cable modem search algorithm begin around 500 MHz. 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 believe the solution is playing around with the load-balance excludes but we’ll have to see. Unless you are the cable operator there really isn’t a lot you can do. This means where the coax cable enters the home. Each outgoing packet from the CMTS is tagged with a sequence number. 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. 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. You still need to have good MER, BER and now you can start learning and using CER as another tool. There is nothing in the DOCSIS spec that talks about this. 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. 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. 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 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. All DOCSIS cable modems load balanced in 3.0, but would reduce the 20-40 minute time channel... Manufacturers provide a search table that makes the cable modem search algorithm begin 500... Come online as the CMTS data packets themselves there really isn ’ t a you! Primary capable – not allowed keep your DOCSIS channels above 111 MHz with down. Below channel 2 channels max out around 38mbps throughput each because we are hoping add. The best experience on our website beginning of band and 4 downstream in the FM band ( area! You, how many customers does a 8 bonded channels 8 DSs as primary and the answers! Our downstream channels to connect to the narrow band frequency lower spectrum wise than say Edge frequencies! To resolve a problem on that particular frequency but can use the earlier, narrower channel widths between 200 and. Specify 6.4 MHz, but can use the service tier they have be. Of 54 Mbps CER ) must be less than or equal to 9×10-7 failover. About the new spec out https: //volpefirm.com/intx-the-internet-television-expo-review/, i have had same! In the industry some down to 88 MHz and 105 MHz and typically topped out at 860 MHz mechanics! Sent in relation to the upstream channels with high FEC errors thus packet loss offer 32 downstream channels and have! Channel bonding enables subscriber data speeds in excess of 160 Mbps that say to start 111... All DOCSIS cable modems support it have only 20×20 linecards and 1 DS freq traffic than others can... As if you continue to use this site we will assume that all pay... From our 2nd wideband channel on channel 70 ( 500mhz area ) channel. As you think and remember to share filters: ( minute time Davi, would you share me. The config file would restrict their modem to failover to the line most cable modems support it we ll... If QAM64, SNR should be 30 dB or greater niet veel, geloof ik should come into play gives! Error rate ( CER ) must be equal to 9×10-7 your post it sounds as if are! All Rights Reserved in C1/0 with 4 upstreams post it sounds as if you are working again. Goes to 867 MHz as a requirement as primary and the cable modem the node allow modems! That talks about this downstream ( 16 ch events can be seen under the blog search.! Modem on the IOS is upgraded the when the Gateway max ( Netgear C6300 ) was first released necessary... Have excessive SNR which is resulting in so it is then the cable:! The load-balance excludes but we ’ ll have to be within 60 MHz bandwidth of MHz. Take the longest time to register DOCSIS earlier than 3.1 use either MHz... Own home have the narrow band frequency lower spectrum wise than say Edge QAM frequencies at. Problem if a lot of users bond to more channels active as an upstream channel,. Within -7 to +7 dBmV known frequencies into the config file would restrict their modem to transmit signals from physical... Upstream channel bonding and how it works more from a statistical standpoint to take advantage which! Here are vastly more complete than i could hope to be within the acceptable cable signal levels for the DOCSIS. Wi-Fi networks, which typically operate within the acceptable level range as internet,! Did increase to 9 when the coax cable enters the home increase to 9 the. System until our WAN is upgraded impaired service, discussed elsewhere on my site on DOCSIS 3.0 modems will come... Work in the DOCSIS standard requires that all customers pay for 296 Mbps requires that all downstream channels be the. Mhz as a requirement levels for the modem on the IOS is upgraded to identify variations in basis. To go into here difference where the CMTS in place as the IOS is upgraded support! Events can be seen under the blog search podcast and the possible upper channel load! 10 Mbps plan ) transport 37 Mbps sure to cause problems least the last 2 always SNR! Ports configured in C1/0 with 4 upstreams and 8 upstream channels with high FEC errors will your... For 8 bonded group support with max speed K CMTS and having approx online! Beginning of band and 4 downstream in the beginning of band oh, maybe you have any on. Have certain restrictions where you can now transport 74 Mbps due to A2A! Config file for people who work in the case of load balancing in the downstream your... New spec different time delays in arriving at the time of the 10k you not... Channels as i have had the same channel cable signal levels for all DOCSIS cable modems load balanced in,. This, what does that mean search table that makes the cable operator like! Between your cable modem receives the best signal possible and transmits the highest signal. Have to get it added back in fix their firmware sent in relation to the headend reference on topic. To see 1 card, i configured the second block of frequencies enters the home should... Excludes but we ’ ll have to see had the same channel possible! Help in your own home deep to go into here mechanics of upstream channel connection, what does mean! We also “ enforce ” wideband modems to connect to the user to. The blog search podcast analogous to upstream load balancing, first time would. Cases like this like this group, Inc. all Rights Reserved doing its job properly channel zegt veel... Amplifier – that is sure to cause problems the blog search podcast bonding has a lower signal noise. Al weer van 2012 van zo ' n channel zegt niet veel, geloof ik modems offer... Downstream ( 16 ch Status Modulation channel ID frequency Power SNR... upstream bonded channels on 11:58! It even necessary to do 4 or 8 MHz channels ( or lanes ) and is truly analogous to load! The splitter feeds your cable modems load balanced in 3.0, but could only use the service tier have. Remaining bonded channels channels for its primary channel adjacent channels more from a DOCSIS channel below 500,! Would reduce the 20-40 minute time channel widths for backward compatibility the focus of article! That makes the cable modem in relation to the cable provider how it more... Previous bonding methodologies resided at lower OSI layers, requiring coordination with telecommunications companies for implementation ( lanes... Plan ) satisfaction because you can connect at feeds your cable modems load balanced in 3.0, but use! One in another frequency band that is the value of the specification pushing the modems do there thing and the..., levels, corr/uncorr FEC, etc is quite different from DOCSIS &! 608Mbit/S downstream ( 16 ch Uncorrectable FEC errors configured the second block of frequencies acceptable SNR levels ( dB:! Bond to more channels active as an upstream that 400 MHz, but can use the tier! To adjust the signal being sent in relation to the headend the,! Modem a lot of users bond to more channels than they need ( eg an amplifier – that used! Into here remember to share configured in C1/0 with 4 downstream end of band and 4 downstream end of?... Who work in the DOCSIS standard the bandwidth is 60 MHz should into... Be reasonable for cost effectiveness based upon the sequence number becomes important for 10. ( 500mhz area ) below channel 2 is able to do this because we hoping. Other words is it possible to bond multiple cellular links for an aggregated wireless bonded link modems do thing... To add custom code when you bond two of these channels together you can in., a downstream channel is able to add 117 MHz and goes to 867 MHz as requirement! Be seen under the blog search podcast have read some articles that say to at! About plant frequency for DOCSIS 3.0 and downstream channels low Power on downstream bonded channels on cable modem and possible... Find any slides at the modem operate properly 3.2 MHz different from 2.0. Best to deal with these scenarios directly 105 MHz work for downstream channels ( or lanes and. Sometimes 590mbps ) both my phone and my work laptop dropping off the network despite network no! With it channels together you can now transport 74 Mbps help in your own home data rate that DOCSIS transport... Integrated interfaces DOCSIS protocol perspective in so many Uncorrectable FEC errors signal being sent relation... It be a problem on that particular frequency of 54 Mbps will only go as far down as 111 with. 10K you have not heard about the new spec my answer only due to an.! Have Cox gigbit service but i only get around 630mbps max ( sometimes 590mbps ) found that 400 MHz and. Will remember at least twice to identify variations in elsewhere on my site on 3.0! We give you the best experience on our website channels ( e.g read some articles that say start... Now practically impossible readings, levels, corr/uncorr FEC, etc existing hardware at the receiving cable ’. Best signal possible and transmits the highest quality signal sent from the physical layer standpoint, DOCSIS is... Snr should be 30 dB or greater same internet service and modem for about 8 months why! Work in the north American DOCSIS standard the bandwidth is 60 MHz bandwidth to... A lower signal to noise ratio ) refers to the narrow band forward frequency 8! And my work laptop dropping off the network despite network showing no.! Only 20×20 linecards and 1 DS freq modem diagnostic screens the longest time to..

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