AAL2 signaling is the signaling protocol employed to establish connections between nodes of an AAL2 network.

The AAL2 signaling software provides the following capabilities:

  • Procedures to establish, maintain and terminate switched AAL2 connections
  • Implementation of signaling transport converter modules to transport signaling PDUs over MTP3B
  • Implementation of signaling transport converter modules to transport signaling PDUs over SAAL (SSCOP/SSCF)

Trillium AAL2 Signaling software enables telecom equipment manufacturers of soft switches, signaling gateways, signal transfer points, service control points, media gateway controllers or other products to:

  • Accelerate time to market
  • Reduce development costs
  • Reduce project risk of internally developed AAL2 Signaling applications

Product deliverables consist of C source software, documentation, training, a warranty and technical support.

AAL2′s Variable Bit Rate (VBR) service handles Voice-over-ATM far more efficiently than the Constant Bit Rate (CBR) service of AAL1, which allocates fixed bandwidth for traffic that is deterministically variable. AAL2 signaling provides bandwidth-efficient transmission of low-rate, short, and variable packets for time-sensitive applications by statistically multiplexing them using VBR ATM traffic class. AAL2 signaling enables multiple user channels on a single ATM virtual circuit with varying traffic conditions for each individual user or channel. AAL2 signaling enables the packing of short-length packets into one (or more) ATM cell(s) and provides recovery mechanisms from transmission errors. AAL2 signaling is particularly critical in providing broadband transport for time-sensitive voice traffic in ATM’s weak spot, “the last mile,” via such enabling technologies as 3G wireless and DSL.

The following figure illustrates the AAL2 signaling network.

Diagram Trillium Protocol AAL2 Signaling

FEATURES + BENEFITS

AAL2 Signaling provides these protocol features:

  • Procedures to establish and release AAL2 connections between communicating end systems
  • Addition and deletion of multiple AAL2 paths (ATM VCCs) between adjacent AAL2 nodes
  • Blocking and unblocking of AAL2 paths between adjacent nodes
  • Resetting and stopping reset of AAL2 paths
  • Error detection and recovery procedures
  • Transport of signaling data over MTP3B by implementing the signaling transport converter module
  • Transport of signaling data over SAAL by implementing the signaling transport converter module
  • Flexibility for the signaling entity to operate over SAAL, MTP3B, or both
  • Call routing based on (layer manager) configured routing information. Additionally, provides the user with the option of performing call routing during call establishment.
  • Flexibility to the service user to perform its own resource management (link characteristics and CID management)
  • Configuration of multiple transport links between adjacent AAL2 nodes, when the signaling transport is SAAL
  • Conforms to Trillium Advanced Portability Architecture (TAPA)
  • Benefits of licensing Trillium software from Continuous Computing

PRODUCT INTERWORKING

Trillium AAL2 Signaling software interworks with Trillium MTP3B and Trillium Q.SAAL products.

CONFORMANCE

Trillium AAL2 Signaling software supports the following standards:

  • Draft ITU-T Recommendation Q.2630.1 (July 1999) – AAL type 2 Signaling Protocol.
  • Draft ITU-T Recommendation Q.2150.1 (May 1999) – AAL type 2 Signaling Transport Converter on Broadband MTP.
  • Draft ITU-T Recommendation Q.2150.2 (May 1999) – AAL type 2 Signaling Transport Converter on SSCOP.

Refer to the AAL2 Signaling Functional Specification for detailed implementation.

TRILLIUM AAL2 SUPPORTS

  • AAL2 signaling procedures of Q.2630.1
  • NNI-STC over MTP Level 3 (Q.2150.1)
  • UNI-STC over SSCOP (Q.2150.2)
  • Adding and deleting multiple AAL2 paths (ATM VCCs) between adjacent AAL2 nodes
  • CID allocation
  • Managing the AAL2 path
    - Blocking
    - Unblocking
    - Reset
  • Call routing, based on the configured routing information
  • Flexible APIs to provide all the information required to allow the user application to manage resources and CIDs, and to allow the user application-defined call routing during call establishment
  • Provisioning multiple transport links between the adjacent AAL2 nodes, when the signaling transport is SAAL

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