What is bonded upstream channel? Like downstream channel bonding , upstream bonding consists of two or more channels active as an Upstream Bonding Group (UBG). In order to enable multiple upstream channels in a cable modem, a special mode is turned on in the cable called Multiple Transmit Channel mode (MTC mode).
What are downstream bonded channels?
Downstream Channel Bonding enables subscriber data speeds in excess of 160 Mbps. This article will cover the physical layer and protocol of DOCSIS 3.0
How to unlock upstream channels?
the lock/unlock comes from both your signal from your isp and your partitioning. If you take a screen snip of your modem connections page, what does it show? Are you having issues with your device? And if so, what are the issues? details help more than being brief as we aren't there to see everything you're doing/experiencing.
What is downstream channel bonding?
Channel bonding provides cable operators with a flexible way to significantly increase downstream speeds to a maximum of 160 Mbps, and upstream throughput up to a maximum rate of 120 Mbps to customers. Channel-bonding combines the bandwidth of upstream and downstream channels available to cable modems.
What does bonded channel connection mean?
What Does Channel Bonding Mean? Channel bonding is a practice commonly used in IEEE 802.11 implementations in which two adjacent channels within a given frequency band are combined to increase throughput between two or more wireless devices. Channel bonding is also known as Ethernet bonding, but it is used heavily in Wi-Fi implementations.
What is a bonded upstream channel connection?
Like downstream channel bonding, upstream bonding consists of two or more channels active as an Upstream Bonding Group (UBG). In order to enable multiple upstream channels in a cable modem, a special mode is turned on in the cable called Multiple Transmit Channel mode (MTC mode).
How many upstream bonded channels should I have?
Upstream power level limits depend on the number of upstream channels locked. For some networks, the power limits for 3 to 4 channels are 35 to 51 dBmV. Ideal levels are approximately 40 to 50 dBmV for single channels, 37 to 48 dBmV each for 2 to 4 channels.
What does channel bonding mean?
Channel bonding is when a cable modem combines multiple channels to increase the amount of traffic that it can comfortably support. The best example for how channel bonding works is to look at a highway with heavy traffic.
What is an upstream channel?
Upstream channels are also known as “upload speed.” This refers to the data that your computer sends out to the Internet. Anytime you use your computer to send and email or post a picture to your social media channels, your computer is uploading data.
Does Docsis 3.1 use channel bonding?
Most of the DOCSIS 3.1 modems come with a channel bonding that uses 32 channels for downstream and 8 channels for upstream. Although, they aren't useful if you don't have a gigabit internet connection, but if you do have one, then you shall experience high stability.
What is a good upstream power level?
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. Good Downstream power levels are within -7 to +7 dBmV. Good Upstream power levels are within 38-48 dBmV.Dec 6, 2016
Is channel bonding good?
To offer the best possible performance, modems use channel bonding to effectively link lanes and improve the performance of the connection. Bonded channels are written as 'Number of Downstream channels X Number of Upstream channels'.
Why is channel bonding important?
when you don't have enough lanes. That's why modems evolved to have more than one lane. And that's accomplished through a technology called channel bonding. Channel bonding combines multiple channels—or lanes—to increase the amount of traffic that a modem's highway can comfortably support.
Why does channel bonding improve performance?
Channel bonding splits your web traffic at the packet level among multiple internet connections. This means that channel bonding will be effective even for the user trying to stream a large movie because traffic is split at a low level.Dec 14, 2021
What are downstream and upstream channels?
The upstream is from the customer to the provider (requesting a Web page, sending email, etc.). In cable TV, downstream signals are the network, movie and sports channels transmitted to the customer. However, if the cable provider offers video-on-demand or Internet access, the cable also has an upstream.
How many upstream channels does Comcast use?
That's all they offer is 3 to 5 upstream channels.. The upstream power is on the high side and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.Dec 20, 2020
Should downstream bonded channels be locked?
Acquire Downstream Channel: This should say "Locked", "OK" or similar. This means your modem found the frequency with which to receive information from the internet. There should always be at least 1 channel acquired with a DOCSIS 1.1 or 2.0 modem.
What happens if a channel becomes unusable?
MAP grants). If the CM becomes aware, it will stop sending REQs for data. Both the CM and CMTS will continue to do Initial Ranging (i.e. the cable modem will continue to establish communication with the CMTS) until the channel become available. So basically, if an UBG channel becomes unavailable, the DOCSIS 3.0 network will continue to work with the remaining upstream bonded channels until the down channel is brought back up. Its smart enough to know not to transmit any data on the down channel.
How does CMTS work?
At a very basic level, the CMTS assigns each upstream channel with a service flow. The Best Effort service flow is a just one of many “SID Clusters” that assigns this type of service flow to each channel in the bonding group. Queuing in the cable modem buffers data and then bandwidth REQs on any upstream from the CM allow the CMTS to load balance the CM by sending back MAP Grants to any upstream channel. Why would load balancing be necessary? For one the CMTS is managing many cable modems, some of which could be legacy DOCSIS 1.x/2.0 modems using only one of the available channels in the bonding group. Further, there could be impairments on some upstream channels seen by some modems. Higher levels of service flows will be established for QoS by the CMTS, this will be another SID Cluster and spread across the bonding group so that load balancing can also occur for that particular QoS service flow to achieve the best possible performance in the case of traffic or impairments.
Does DOCSIS 3.0 support upstream channel bonding?
Since its inception, the DOCSIS 3.0 specification has supported upstream channel bonding. Most CMTS vendors have not supported this in their firmware until the past year. In most cases the firmware that is available is still in beta testing in cable operator labs to ensure cable modems and networks can support it – why? The bonding of two, three or four upstream channels in an RF DOCSIS network creates a lot of challenges such as finding enough RF spectrum, resolving overloading return path lasers, isolation issues and much more. Some of these items have been addressed in the Speeding Upstream Articles written by John Downey and me.
What is cable upstream resiliency?
The cable upstream resiliency module ensures that a CM remains operational if one or more non-primary upstream service flows of the CM enter temporary or persistent error states. This module enables a Cisco CMTS router to handle various events and maintain the transmit channel set of each CM.
What is upstream weighted fair queuing?
The upstream weighted fair queuing (WFQ) is a quality of service (QoS) feature that enables the Cisco CMTS router to allocate optimum bandwidth to upstream service flows based on the WFQ parameter configurations. To enable upstream WFQ, you must configure either the class-based or activity-based WFQ on a cable interface.
What is Cisco Extended Transmit Power?
The Cisco Extended Transmit Power feature, introduced in Cisco IOS Release 12.2 (33)SCE3, supports DOCSIS 3.0 CMs operating in MTC mode to transmit at a higher power level than the power level specified in the DOCSIS 3.0 Specification. This feature is supported only with Cisco DPC3000 CMs.
What is reduced channel set?
The Reduced Transmit Channel Set feature, introduced in Cisco IOS Release 12.2 (33)SCE3, enables the Cisco CMTS router to reduce upstream channel set assignment based on the total power budget of the CM. For example, a reduction from four to two upstream channels gains 3 dB headroom. Further reduction from two channels to a single channel gains another 3 dB headroom, and the CM starts operating in non-MTC mode.
How does Cisco CMTS work?
A Cisco CMTS router can assign one or more service ID clusters to the upstream bonded service flows (upstream service flows assigned to an upstream bonding group) at the time of service flow creation. A SID cluster contains one SID per upstream in a bonding group. A CM uses one of the SIDs defined in the SID cluster for the upstream interface when the CM sends a bandwidth request. The CM chooses a SID or a SID cluster based on the SID cluster switching criteria.
What is channel bonding modem?
Channel bonding is when a cable modem combines multiple channels to increase the amount of traffic that it can comfortably support. The best example for how channel bonding works is to look at a highway with heavy traffic. Here is what we mean:
What is cable modem bonding?
A cable modem’s downstream and upstream channels are like the lanes going in and out of a city. A cable modem with 1×1 channel bonding is like a two-lane highway with 1 lane going into the city and 1 lane going out. This means that there is 1 downstream channel and 1 upstream channel.
What is cable modem?
Cable modems have downstream and upstream channels. These channels are what allow you to download and upload data. And the more channels you have, the faster you can do this.
What is downstream channel?
Downstream channels, or “download speed,” refers to the data that your computer receives from the Internet. When you use your computer to download music, podcasts, games, apps, pictures or other web content, you are using your computer’s downstream bandwidth.
What is the name of the channel that a modem communicates with an ISP?
Your cable modem communicates with your ISP through channels. These channels are known as upstream and downstream channels . Upstream and downstream channels are what make up your total bandwidth or Internet speed.
How does a cable modem work?
A cable modem communicates with your Internet service provider (ISP) to bring an Internet connection into your home or office. This device uses the TV coaxial cable wiring already in your home. There are a few features that are important to know when choosing the right cable modem. One is the number of upsteam and downstream channels. The other is whether your cable modem supports fixed or switchable frequency. The two features directly relate, but in this page we are focusing on fixed versus switchable frequency and what that means.
Can a modem upload data faster than a computer?
Generally, your computer or device can download data much faster than it can upload that same data. This means that the number of upload channels that your modem supports will be much less (or much slower) than the download channels. That’s not an issue for most people.
What is channel bonding?
Channel bonding is a practice commonly used in IEEE 802.11 implementations in which two adjacent channels within a given frequency band are combined to increase throughput between two or more wireless devices. Channel bonding is also known as Ethernet bonding, but it is used heavily in Wi-Fi implementations.
What is downstream channel?
3) In CATV, a downstream channel is one used to transmit signals from the headend to the user. An upstream channel is one in another frequency band that is used to send signals from the user back to the headend.
What does 8x4 mean on a modem?
Sometimes, you'll also spot numbers like “4x4” and “8x4” when modem shopping. These indicate the number of downstream and upstream channels supported by the modem— which refer to downstream data (like streaming or browsing) and upstream data (like transferring files or sending emails), respectively.
