Cisco Systems 8xDMT manual T1.413 and G992.1 G992.2 Framing Mode Downstream Upstream

Models: 8xDMT

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Octal-Port DMT ATU-C Line Card

dmt overhead-framing

Mode 2—Reduced overhead framing with separate fast and sync bytes in the fast and interleaved latency buffers respectively.

Mode 3—Reduced overhead framing with merged fast and sync bytes using either the fast or interleaved latency buffer.

Note Mode 3 is recommended for use on DMT interfaces adhering to the ANSI T1.413 Issue 2 standard. Mode 3 is required for flexi line card DMT interfaces.

The number of overhead bytes per frame varies according to the overhead framing mode and the operating mode, as shown in Table 3.

Table 3

Overhead Bytes per Frame

 

 

 

 

 

 

 

 

 

 

Overhead Bytes

 

 

 

 

 

 

 

 

 

 

T1.413 and G992.1

G992.2

 

 

 

 

 

 

Framing Mode

Downstream

Upstream

Downstream

Upstream

 

 

 

 

 

 

Mode 0

 

4

3

N/A

N/A

 

 

 

 

 

 

Mode 1

 

3

3

N/A

N/A

 

 

 

 

 

 

Mode 2

 

2

2

N/A

N/A

 

 

 

 

 

 

Mode 3

 

1

1

1

1

 

 

 

 

 

 

If, during the training sequence, the ATU-R indicates a lower framing structure than that specified by the ATU-C, the ATU-C falls back to the framing structure number indicated by the ATU-R.

Management requirements drive the determination of overhead, full or reduced. Full overhead provides more bandwidth to the embedded operations channel (EOC), enabling higher polling rates. However, reduced overhead provides enough EOC bandwidth to satisfy typical applications.

The dmt overhead-framingcommand does not cause port retrain when you change the parameter.

Examples

In this example, the command sets the overhead framing mode in the profile named 8xDMT.

DSLAM# configure terminal

DSLAM(config)# dsl-profile 8xDMT

DSLAM(config-dsl-prof)#dmt overhead-framing mode2

Related Commands

Command

Description

 

show dsl profile

Display a specific profile, all ports to which the profile is currently attached,

 

 

and those port settings.

 

 

 

Cisco IOS Release 12.1(6)DA

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Cisco Systems 8xDMT manual T1.413 and G992.1 G992.2 Framing Mode Downstream Upstream, Related Commands Description

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.