Cisco Systems 8xDMT Hs Support ITU G.994.1, Bit Swapping, Fast or Interleaved Path Selection

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Octal-Port DMT ATU-C Line Card

Feature Overview

Benefits

G.hs Support (ITU G.994.1)

G.hs support is provided through both the MIB and the CLI. Features from G.hs that are supported include:

•Enabling/disabling all or one of the following modes.

–G.dmt

–T1.413 Issue 2

–G.lite

•Setting auto mode defers the mode selection to the ATU-R.

•Displaying current mode/capability.

Bit Swapping

Bit swapping is a mechanism that allows DMT transceivers to reallocate bits between carriers and adjust gain scaling based on the carrier SNR margin.

Fast or Interleaved Path Selection

The fast path feature allows you to configure either the fast or the interleave path via DSL profile configuration commands provided that the CPE also supports fast path. You can use either the interleave or fast path with the 8xDMT line card provided that the CPE also supports fast path. The fast path provides improved latency characteristics for applications that cannot tolerate latency (for

example, voice).

The parameters for either path are configurable using the DSL profile configuration commands. Note that although you can configure both paths, only one path will actually be enabled (dual latency is not supported at this time). Thus the maximum bit rates for the unused path must be zero. For example, to configure and use the fast path, you must specify nonzero maximum bit rates for the fast path. Once you configure the maximum bit rates for the fast path, the rates for the interleave path must be zero. The IOS software ensures that only one path is enabled at a given time.

Trellis Encoding

Trellis encoding is a method of providing better performance in a noisy environment. The end result of using Trellis encoding is that you can transmit at faster line rates with lower error rates, thus providing a faster overall throughput in a moderately noisy environment. You can enable or disable trellis encoding for a specific DSL profile.

Enhanced Line Quality Monitoring and Management

The 8xDMT improves the manageability of DMT ports on supported DSLAMs. The following commands are used to configure this functionality:

•dmt minrate-blocking

DMT minrate-blockingcustomizes the DMT port reaction to lines that train below configured minimum bit rates. Formerly, if a line trained below the configured minimum bit rate threshold, it would generate a minor alarm, but the DMT port remained active. The dmt minrate-blockingprevents DMT ports from training when bit rates fall below the configured minimum threshold specified in the dmt bitrate minimum command.

Cisco IOS Release 12.1(6)DA

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Contents Feature Overview Octal-Port DMT ATU-C Line CardFast or Interleaved Path Selection Hs Support ITU G.994.1Bit Swapping Trellis EncodingMinrate-blocking Dmt rate-adaptation Hardware Documents Software DocumentsNumber of Available 8xDMT Chassis Slots Supported PlatformsDSLAMs Standard Mibs Supported Standards, MIBs, and RFCsStandards Cisco-Derived MibsPrerequisites Configuration TasksCommand Purpose Select the profile that you want to attach to Enter DSL profile configuration modeUpstream on the fast path. Automatically configures Selected port. The profile name 8xDMT is used asMonitoring and Maintaining the 8xDMT Line Card Configuration Examples Current configuration 7019 bytesCommand Reference Syntax Description Defaults Command Modes Command History AlarmsAlarms Release ModificationCommand Description ExamplesCommand Modes Command History Dmt bitrateDownstream Upstream Path Aggregate Configuration Data Range DefaultThose port settings Path KbpsValues for the connection You, use the dmt bitrate command to reduce the bit rateDmt check-bytes Downstream and 6 upstreamRelated Commands None ReleaseModification Dmt marginDmt margin downstream dmt-marginupstream dmt-margin IOS 12.16DA This command was introduced Syntax Description Defaults Command ModesCommand History Release Modification Dmt minrate-blockingSyntax Description Defaults Command Modes Command History Usage GuidelinesDmt overhead-framing T1.413 and G992.1 G992.2 Framing Mode Downstream Upstream Related Commands DescriptionDmt rate-adaptation enable Dmt rate-adaptation enableAdaptation, use the no form of the command This command has no arguments or keywordsDefaults Command Modes Command History Dmt rate-adaptation intervalUpstream monitoring interval is 20 seconds Min Dmt rate-adaptation marginDmt rate-adaptation margin min downstream dB upstream dB None Global configuration SlotUsage Guidelines Examples Glossary Pseudonym for G.992.1 Loss of signal Loss Of Delay SynchronizationProblem is found Loss of Cell DelineationRemote host and act as normal terminal users of that host LAN. Has no password securityProviding reliable, connection-oriented full-duplex streams VCI VPI

8xDMT specifications

Cisco Systems’ 8xDMT, or "Eightfold Digital Multicast Technology," is a pioneering solution designed to optimize multicast traffic management and enhance the scalability of network performance. This technology comes into play primarily in video broadcasting, online gaming, and other applications that require the efficient distribution of data to multiple endpoints, significantly reducing the bandwidth use while improving overall network efficiency.

One of the primary features of Cisco 8xDMT is its ability to support multiple multicast streams concurrently. By using advanced algorithms, 8xDMT ensures that network resources are utilized efficiently, minimizing latency and maximizing throughput. This makes it particularly advantageous for service providers and organizations that deliver high-definition video content or require real-time data transmission across geographic locations.

Another notable characteristic of the Cisco 8xDMT is its integrated Quality of Service (QoS) capabilities. This feature allows for the prioritization of multicast traffic, ensuring that critical data packets are transmitted smoothly without delay, even during peak load times. The QoS management allows administrators to configure settings that guarantee minimal disruptions, providing end users with a seamless viewing or gameplay experience.

Additionally, Cisco 8xDMT takes advantage of Multicast Domain Name System (mDNS), which allows devices on the same network to discover and communicate efficiently. This not only aids in reducing the network load but also simplifies the management of multicast addresses, making it easier for organizations to scale their operations without significant overhead.

The technology also incorporates robust security features, including support for secure multicast transmissions. This ensures that sensitive data remains protected during distribution, addressing the increasing need for security in an era where cyber threats are prevalent.

Furthermore, Cisco Systems emphasizes interoperability with its 8xDMT platform, ensuring easy integration with existing network infrastructure. This is crucial for enterprises looking to modernize their systems without the need for extensive reinvestment in new hardware.

In conclusion, Cisco Systems’ 8xDMT stands out as a versatile and high-performance multicast solution designed to meet modern networking demands. With its ability to manage multiple streams, enforce QoS, simplify multicast management, and secure communications, it holds significant potential for transforming how organizations distribute data efficiently and effectively.
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