Enhanced management of pointer processing in case of concatenated payload in SDH and SONET frames

A payload and pointer technology, applied in electrical components, time-division multiplexing systems, multiplexing communications, etc.

Inactive Publication Date: 2005-04-20
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The solution to the above and other problems can be accomplished by the method, pointer processing state machine and network elements of the present invention

Method used

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  • Enhanced management of pointer processing in case of concatenated payload in SDH and SONET frames
  • Enhanced management of pointer processing in case of concatenated payload in SDH and SONET frames
  • Enhanced management of pointer processing in case of concatenated payload in SDH and SONET frames

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Embodiment Construction

[0022] As mentioned above, the present invention is primarily based on judging the received possible connection levels in two separate steps. First step: where a single state machine implements some state diagrams for a standard pointer interpreter for connected and unconnected pointers (see mainly ETS 300 417-1-1, Figures B.1 and B.2) Consolidation of state diagrams for state machines. These state machines are applied to all branches in parallel.

[0023] The second step: where the top-level processor combination circuit processes all the output indications of the first state machine, and recognizes any possible combination of connections among the standard connections. When an alarm is generated for the connection payload, the connection is broken and these branches are treated as independent.

[0024] Thus, according to the invention, any single pointer handling state machine (SM1, SM2, ... SMn) is provided for each branch in the network element. Each individual pointer ...

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Abstract

The present invention relates to a method for improving the management of pointer handling for connected and / or non-connected payloads in SDH / SONET frames. The method includes the following steps: receiving individual indications about a single branch status, which indications include normal status (NORM), connection status (CONC), lost pointer (LOP) and alarm indication signal (AIS); processing according to a pure combinational logic These separate indications; if one of the preset connection states is recognized, the recognized current state of the received SDH / SONET frame stream is immediately announced, or, if no preset connection state is recognized, then Treat branches as independent. What is different from the prior art is that the step of announcing the connection status is performed independently of the previously stored connection level.

Description

technical field [0001] The present invention relates to the field of synchronous digital transmission, and in particular to a method and circuit which can improve pointer handling when SDH or SONET frames contain payloads of consecutive connections. Background technique [0002] According to relevant international standard proposals, SDH and SONET frames are transmitted with a pointer. A pointer is an indicator whose value defines the frame offset of the virtual container relative to the frame reference backing its transport entity. Sometimes virtual containers are linked. Virtual container concatenation is the process by which a number of virtual containers are interconnected so that their combined capacity can be used as a single container, thereby maintaining bit sequence integrity. By convention, "VC-n-Xc" refers to X consecutively connected VC-n. [0003] Pointers for connection payloads are handled differently than pointers for non-connection payloads. In particula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0623
Inventor B·阿尔贝托R·安东尼奥R·L·加布里埃莱
Owner ALCATEL LUCENT SAS
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