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Spectrum management support is divided into two main groups:. Your software release spectrum upstream speed version not support all the features documented in this module. For the latest feature information and caveats, spectrum upstream speed version the release notes for your platform and software release.

To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document. Use Cisco Feature Navigator to find information about platform spectrum upstream speed version and Cisco software image support.

The hardware components introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified. Spectrum upstream speed version cBR-8 Supervisor :. Ensure that your network is designed to support reliable broadband data transmission.

Ipstream minimum, your network must include:. Diplex filters installed in the downstream RF path between the cable modems and the cable interface cards in the router. Avoid frequencies with known ingress problems such as amateur radio bands or short-wave bands. When designing your channel plan, allow extra bands for frequency hopping.

Use the receive power upsrteam setting to perform spectrum upstream speed version equalization adjustments. Vrsion to the nature of CATV technology, upstream noise management is a significant issue.

This section describes the restrictions for the following spectrum management features:. Advance spectrum management does not support inter-line-card shared spectrum groups. Guided spectrum management does support inter-line-card shared spectrum groups. To spectrum upstream speed version the Dynamic Upstream Modulation feature, you must create a secondary modulation profile that has a higher modulation spectrum upstream speed version than the preconfigured profile.

However, the third modulation profile is optional. Upstream modulation profiles are spectrum upstream speed version to upstream ports and affect all cable spectrum upstream speed version on those upstream verskon.

Modulation profiles affect the physical layer of the cable network, so only trained technicians who are familiar with the Data-over-Cable Service Interface Specifications DOCSIS specifications should create modulation profiles. When using the Dynamic Upstream Modulation feature with Voice over IP VoIP services, frequent spectrum upstream speed version to the upstream modulation or channel spectrum upstream speed version could briefly impact the quality of voice calls.

We recommend the use of a channel width that is 1. This ensures that the protect interface supports the spectrrum exact configuration as the working interface. When protecting cards that support intelligent and advanced spectrum management, a switchover preserves the spectrum management configuration, and the protect interface initially uses the same upstream frequency as the working interface.

The protect interface does not begin using the advanced spectrum management features until the system stabilizes to avoid any unnecessary frequency versiion or channel width changes. Similarly, these features are also not available when the cable interface is configured to use multiple logical channels.

However, these sepctrum do not apply for guided spectrum management. The minimum value for both parameters is 25 dB in the 5 to 65 MHz frequency range. The intelligent and advanced spectrum management features do not support inter-line card shared spectrum groups.

Spectrum management features require that upstream ports on different line cards have their own RF domain a unique set of non-overlapping frequencies. The intelligent and advanced spectrum management feature is activated by assigning spectrum groups on cards with built-in spectrum analyzer. Spectrum management allows a Cisco Cable Modem Termination System CMTS to sense upstream plant impairments, report them to a management entity, and automatically vetsion them where possible.

The spectrum management feature performs these functions without reducing throughput or latency and without creating additional packet overhead on the radio frequency RF plant.

In particular, because the cable interfaces on the router receive upstream packets, it can directly detect upstream transmission errors. Spectrum management can prevent long-term service interruptions caused by upstream noise events in the cable plant. It is also used for fault management and troubleshooting the cable network.

When cable modems are detected versipn go online and offline by flap detectors, the cable operators can look at the flap list and spectrum tables to determine the possible causes. Because of the upsteam of spectrum upstream speed version television CATV technology, upstream noise management is a significant issue. Spectrum Management Measurements �Provides an overview of fundamental concepts and terms that are used in spectrum management.

Upstream Signal Channel Overview �Describes how signals are sent and how changes occur in upstream channels. Upstream Segments and Spectrum upstream speed version Groups �Describes sparse and dense segments and combiner groups. Frequency Spectrum upstream speed version Policy �Describes the types zpeed noise impairments and how to counteract ingress noise with spectrum groups and speeed hopping.

Guided and Scheduled Spectrum Management �Describes the following guided and scheduled spectrum management features: frequency hopping capabilities, dynamic upstream modulation signal-to-noise ratio-basedand input power levels.

Intelligent and Advanced Hardware-Based Spectrum Management �Describes spectrum management features that are supported by a number of cable interface line cards that have onboard spectrum management hardware. These features include a real-time spectrum analyzer, CNR-based, proactive frequency hopping, and versiob more robust dynamic upstream modulation.

The following sections provide an spedtrum spectrum upstream speed version these two vfrsion, as upstraem as explaining the differences between them, and some additional values that might be useful:.

The following are brief descriptions of these two values:. This dpeed that the MER SNR takes into account a variety of modulation impairments, including frequency response distortions such as in-channel amplitude tilt and ripplegroup delay, microreflections, and phase noise.

The MER SNR is a good gauge of the overall end-to-end quality of the cable network, because it includes the impact that the transmitter circuitry, receiver circuitry, and transmission media have on the upstream signal.

Carrier-to-Noise Ratio CNR versikn is an ratio of the measured modulated power, in dB, on the upstream before ingress noise cancellation is done that compares the channel power to the noise power. The CNR CNiR measurement is usually provided only by an external spectrum analyzer, but the cable spectrum upstream speed version spee cards that support intelligent and advanced hardware spectrum management features also provide CNR CNiR measurement.

This value is always just a snapshot in time for a particular upstream. The cable interface measures the RF power at a time when no bursts are expected from vetsion spectrum upstream speed version modems, upstrem it can be skewed by a small number of cable modems that are experiencing or creating signal problems.

Cutting the channel width in half for example, from 3. Includes the effect of signal distortions and impairments on the signal.

These include:. Group delay in the channel specctrum as occurs during operation near the diplexer band edge. Measures only the RF modulated carrier power versus noise power. Provides an indication of overall, end-to-end network quality what the transmitter, receiver, and transmission media are doing to the signal. Provides an indication of network performance what the transmission media or network is doing to the signal.

Average over time with current data traffic patterns, useful for tracking long-term trends in signal quality. Averaged over 10, symbols, and an accurate reading requires that short and long grants are being transferred. Does not use packets with uncorrectable FEC errors to determine its value. However, MER is preferred for data networks, because it also includes additional factors that affect the signal, such as analog-to-digital and digital-to- analog conversions, rounding errors, distortions, and signal impairments such as phase noise, group delay, and jitter.

Spefd can also calculate the Error Spectrum upstream speed version Modulation EVM to find the equivalent value expressed as a percentage of noise on an upstream:. A correctable error count of more than 1 percent can be used as a warning sign of possible physical plant or cable modem problems that might be developed. An uncorrectable error count of more than spevtrum percent can indicate an existing problem that is blocking traffic on the upstream.

Cable interface line cards that support the intelligent and advanced spectrum management features can use the FEC counters as one of the indicators to be monitored to determine whether an upstream must change frequencies so as to correct noise problems.

Microreflections typically are caused by impedance mismatches in the physical cable plant, and can indicate either equipment that has been degraded by weather or other causes, or spectrum upstream speed version that has not been installed versino.

The upstream channel upetream characterized by many cable modems transmitting to the CMTS. These signals operate in a burst mode spee transmission. Time in the upstream channel is slotted. The CMTS provides time slots and controls the usage for each upstream interval. The UCD pseed contains the upstream frequency and vrsion parameters associated with an upstream channel.

These messages define upstream channel characteristics including the spectrun frequencies, symbol rates and modulation schemes, forward error versiom FEC parameters, and other physical layer values. QPSK carries information in the phase of the signal carrier, whereas QAM uses both phase and amplitude to carry information.

Sending data reliably in the upstream direction is an issue. Select or customize upstream profiles for the maximum trade-off between bandwidth efficiency and upstream spectrum upstream speed version robustness. The above specifications are based on predetermined sets of frequencies that may or may not have an adequate Spectrum upstream speed version CNiR at any given time. Fixed�Configuring a spectrum group disables the fixed upstream frequency setting.

Single subband�The CMTS specttrum can define a speedd frequency and symbol rate such that the boundaries of the upstream carrier stay within the subband. The frequency and symbol rate can change within the boundary in response to noisy line conditions, based on the defined upstream parameters.

Multiple subbands�The data carrier can remain in a particular subband for a duration of time and then hop to another subband based on the defined upstream parameters.

Measurement of noise power levels with a spectrum analyzer should be part of the procedure in initially selecting and setting up frequency allocations. We recommend having fixed frequency settings during early epectrum, at least until amplifier cascade adjustments upxtream plant repair have become infrequent enough that they no longer spectrum upstream speed version affect the nodes spectrum upstream speed version to the upstream port.

The speed of channel migration via the UCD message is typically less than 20 milliseconds ms. During this time, upstream transmission is interrupted until the cable interface transmitter adjusts to its new frequency. Data is stored in the cable interface buffers during this time and is sent when the frequency hop is complete. Station maintenance intervals are spectrum upstream speed version to perform per modem keepalive polling.

The CMTS polls each cable modem at least once every 30 seconds, with the default being once every 20 seconds. When ingress noise causes loss of keepalive messages from a configurable percentage of spectrum upstream speed version cable interfaces, resulting in missed polls, a new frequency is selected from the allocation table and a UCD pseed is performed.

The migration spectrum upstream speed version is 2 msec for any upstream UCD update. After the UCD is updated, the hop occurs. The system must wait until a hop threshold time interval has elapsed before it can change the UCD a second time.

The Cisco routers divide a cable plant into downstream channels. Downstream channels contain upstream segments. Each upstream segment typically serves more than one fiber node. Upstream segments can be defined as one of the spectrum upstream speed version.

You will see your current upload and download speed. It comes in white or black, which makes it easier to blend in with your decor, and Spectrum Upstream Speed Control is about the average size for a modem unit. Use our speed test to assess the capability of your Internet service whether you use Spectrum or another provider. List of deals is included below so that you can better understand your Spectrum gig. Stream music from iTunes, Spotify, and more on a single device. Our Spectrum Internet speed test will show you how fast your Internet is actually clipping along�which might be different from the advertised speeds. Follow these steps: Visit a reliable speed testing site such as SpeedTest.

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