Transparent Mapping of Client Data Signals in Telecommunications Transport
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Solution Overview
Problem
Existing telecommunications transport methods for client data signals are not fully transparent, as they require insertion/deletion of idle characters for rate adaptation, leading to complexity and error multiplication, especially for non-standardized signals like IBM ISC-2/3, which can result in improper operation.
Innovation Solution
The method divides a transport frame into four segments: client data, fixed stuff, justification data, and justification control information, allowing for transparent mapping/demapping without idle character insertion/deletion, with the structure varying to meet client data signal requirements and incorporating redundancy for error protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If idle character insertion/deletion is used for rate adaptation, then rate adaptation is achieved, but device complexity increases and errors are multiplied
Solution Approach 1:
The payload portion of the transport frame is divided into four functional segments: Segment 1 for client data, Segment 2 for fixed stuff, Segment 3 for justification data, and Segment 4 for justification control information. This segmentation eliminates the need for idle character insertion/deletion by using a structured approach to rate adaptation through justification operations on designated segments.
Solution Approach 2:
The transport frame structure with dedicated segments provides a universal solution that works for all client data signal types without requiring application-specific idle character insertion/deletion functions. The justification data segment and control information enable a single mechanism to handle rate adaptation for diverse client signals including non-standardized ones.
2Ease of manufacture
If inter-frame information is terminated and stripped for encapsulation, then encapsulation is simplified, but transparency is lost and management functions are impaired
Solution Approach 1:
The method extracts only the necessary client data from the incoming client data stream while preserving the complete client data signal including inter-frame information. The client data is mapped into Segment 1 of the transport frame without terminating or stripping inter-frame information, maintaining full transparency for management and other client-specific functions.
3Productivity
If idle characters are inserted/deleted for rate adaptation, then rate matching is achieved, but error multiplication occurs
Solution Approach 1:
The justification data segment acts as an intermediary mechanism for rate adaptation. Instead of inserting or deleting idle characters that can cause error multiplication, the system uses justification operations on the designated justification data segment, controlled by justification control information, to achieve rate matching without compromising data integrity.
Data Source
AI summary
The present invention provides telecommunications transport methods and systems for the transparent mapping/demapping of client data signals without the insertion/deletion of idle characters for client data signal rate adaptation. These methods and systems include mapping an incoming client data signal to and demapping an outgoing client data signal from a transport frame comprising: a first segment that is dedicated to client data; a second segment that is dedicated to fixed stuff, wherein the fixed stuff comprises, for example, network management information; a third segment that is dedicated to justification data for supporting a client data signal rate adaptation function; and a fourth segment that is dedicated to justification control information for indicating whether the third segment is used for client data or fixed stuff, wherein the justification control information is redundant for error protection purposes.