ATM Cell Validity Fields for Arbitrary Bit Rate Circuit Emulation
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Solution Overview
Problem
Standardized circuit emulation service techniques struggle to transport channelized circuits with arbitrary bit rates over Asynchronous Transfer Mode (ATM) networks, as they are restricted to a fundamental 8 KHz frame rate, making it difficult to handle diverse traffic types and rates effectively.
Innovation Solution
Incorporating a 'validity' field for each octet in the ATM Adaptation Layer user information field of ATM cells, allowing for the transmission of channelized circuit data at arbitrary bit rates by indicating valid or invalid data, enabling efficient use of bandwidth across the ATM network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standardized CES technique uses fixed 8 KHz frame rate with N×64 kbps channels, then structure and standardization are maintained, but adaptability to arbitrary bit rates is lost
Solution Approach 1:
The patent changes the fundamental parameter of frame rate from fixed 8 KHz to variable frame rates that adapt to the specific bit rate requirements of each channel. This allows arbitrary bit rates to be accommodated by adjusting the frame rate parameter dynamically, resolving the contradiction between maintaining standardization and adapting to diverse traffic requirements.
Solution Approach 2:
The invention introduces dynamic frame rate adjustment where the frame rate is no longer static at 8 KHz but varies according to the channel's bit rate requirements. This dynamic approach enables the system to handle arbitrary bit rates while maintaining efficient bandwidth utilization, overcoming the rigidity of standardized fixed-rate approaches.
2Productivity
If arbitrary bit rate transmission is implemented without validity fields, then bandwidth utilization improves, but data integrity and reliability deteriorate
Solution Approach 1:
The validity field acts as an intermediary element between the arbitrary rate data stream and the standardized ATM cell structure. It provides a mechanism to mark valid versus invalid octets, ensuring data integrity while allowing flexible bandwidth utilization. This intermediary structure resolves the contradiction by enabling both efficient arbitrary rate transmission and reliable data identification.
3Adaptability or versatility
If fixed N×64 kbps channel structure is used, then standardization and interoperability are maintained, but flexibility for diverse traffic types is reduced
Solution Approach 1:
The patent creates a universal transmission mechanism that can handle multiple traffic types and arbitrary bit rates through a single flexible framework. By using variable frame rates and validity fields, the system achieves multi-functionality, allowing the same infrastructure to accommodate voice, data, video, and other diverse traffic types without being constrained to fixed N×64 kbps channels.
Data Source
AI summary
A system for managing circuit emulation service over an Asynchronous Transfer Mode (ATM) network is provided. The system includes control logic configured to receive channelized circuit data from a client, the channelized circuit data being transmitted at an arbitrary rate. The channelized circuit data is formatted into one or more ATM cells. Each ATM cell has a payload. The payload has a number of octets and corresponding validity fields. Each validity field is used to indicate whether the associated octet contains valid data. The one or more ATM cells are transmitted across the ATM network. By examining the validity fields, the transmission of the one or more ATM cells effectively results in transmission of the channelized circuit data at the arbitrary rate over the ATM network. The arbitrary rate is not a multiple of a fundamental rate.