Managing Traffic Descriptors

Chapter 8 Permanent Virtual Connections (PVCs and PVPs)

A Traffic Descriptor defines the service category that will be used to transport traffic and the bandwidth that is required. Each service category has its own set of parameters. The M770 ATM Switch can support up to 32 different user configured traffic descriptors for the creation of PVCs.

The M770 ATM Switch supports three service categories:

•Constant Bit Rate (CBR) traffic, such as uncompressed voice or video.

For CBR traffic you will need to specify the dedicated Peak Cell Rate (PCR) per second. Bandwidth for CBR traffic is guaranteed for the duration of the connection.

•Variable Bit Rate (VBR) traffic, such as compressed voice or video.

For VBR traffic you will need to specify a dedicated Peak Cell Rate (PCR), a Sustainable Cell Rate (SCR), and a Maximum Burst Size (MBS). Bandwidth for VBR traffic is guaranteed for the duration of the connection.

•Unspecified Bit Rate (UBR) traffic, such as broadcasts frames.

UBR connections will always be accepted but bandwidth will not be guaranteed. This is also referred to as “best effort” traffic.

Note: When creating traffic descriptors all cell rates are specified as cells per second.

If the CLP bit is not set in the ATM cell header, it indicates high priority traffic.

Creating a CBR traffic descriptor

To create a CBR traffic descriptor, use the td setup CBR command.

Command:	M15-155s8:/>td setup CBR <td_id> pcr0+1=<pcr0+1> [pcr0=<pcr0>]
Example:	M15-155s8:/>td setup CBR 2 pcr0+1=64000 pcr0=48000
Parameters:	<td_id>	An unique identifier for this traffic descriptor.
	<pcr0+1>	The combined PCR for all cells regardless of whether the CLP (Cell
		Loss Priority) bit is set in the ATM cell header.
	<pcr0>	An optional PCR for cells where the CLP bit is not set in the ATM
		cell header. This PCR must be less than, or equal to, the combined
		PCR.

Avaya M770 ATM Switch User’s Guide

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M770 specifications

The Avaya M770 is a highly advanced media processor that is part of Avaya's robust suite of communication solutions designed for enterprise environments. This powerful device caters to the needs of modern businesses, providing an efficient platform for managing voice, video, and data communications.

One of the standout features of the Avaya M770 is its high-density processing capability. The device can handle a significant volume of calls concurrently, which makes it an ideal solution for large organizations requiring a reliable communication backbone. The M770 supports a variety of codecs, ensuring high-quality audio and video transmission, which is pivotal for maintaining clarity during communication.

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In conclusion, the Avaya M770 is a comprehensive media processing solution that combines scalability, security, and ease of integration to meet the demands of contemporary enterprises. With its ability to support high-density communications and its advanced management capabilities, it serves as a critical asset for businesses looking to enhance their communication infrastructure.

Avaya M770 manual Managing Traffic Descriptors, Creating a CBR traffic descriptor

Models: M770