(Continuation of Question 14/13 studied during 1997-2000)

Background and justification

New and revised specifications for ATM cell transfer and availability performance are needed to ensure effective deployment and application of B-ISDN/ATM transfer capabilities.

Items for study

Reference models

1. Should new connection models be constructed to represent new applications of ATM, such as Layer 2 transport of IP service, for example LSP for MPLS?

2. What special ATM cell transfer performance issues will arise from the use of new access technologies, e.g. xDSL, PCS, HFC, and fixed wireless?

3. How should ATM cell transfer performance be characterized for multipoint B-ISDN connections?

ATM performance parameters

4. What additional parameters are needed to characterize the performance of new ATM transfer capabilities?

5. How can the definition or the measurement of CDV be improved to discriminate between steady-state CDV and any gradual or step-wise changes in end-to-end CTD?

6. What parameters are required to describe the throughput performance of ATM connections?

Performance objectives, QoS class definitions and performance allocation

7. To improve the responsiveness of B-ISDNs to a variety of end-user QoS needs, how should Table 2/I.356 be updated, including new QoS classes and updated objectives? How should the allocation scheme in section 9/I.356 be updated? Each of these updates should take into consideration new transport media such as wireless, HFC, xDSL and WDM.

8. What performance requirements should be established when the ATM network is serving as a Layer 2 transport for IP service, for example when ATM and AAL are used in connection with MPLS and LSP?

Interpreting QoS signalling

9. How should users’ (implicit and explicit) requests for QoS be interpreted during a connection set-up request?

10. How can the QoS interworking be improved between networks based on ATM Forum specifications and networks based on ITU-T Recommendations?

Measurement and estimation

11. How will a network provider’s commitment to the negotiated QoS be evaluated?

12. How can extremely small CLR, CER, and CMR values be estimated from small sample sizes?

AAL performance

13. How should performance at the AAL be described?

14. What is the relationship between ATM cell transfer performance and the performance obtained from each of the AAL types?

15. What is the performance of AAL type 2 switched connections?

Availability performance

16. How should availability performance objectives be specified in Recommendations I.357 and I.35av be specified taking into account emerging requirements, operational experience with B-ISDN connections, and the observed performance of associated path elements?

17. How will the QoS classes of I.356 impact the ATM availability performance parameters and objectives specified in I.357 and I35av?

18. How should the availability performance of point-to-multipoint, multipoint-to-multipoint, multiconnection, and multimedia services supported by B-ISDN ATM networks be characterized?

19. What is the relationship of throughput to availability?

Specific tasks with deadlines

• Enhancements to Recommendations I.356 and review of its provisional aspects by 2002.
• New Recommendation I.35aal or supplement on AAL performance issues by 2001.
• New Recommendation I35aal2 on switched AAL type 2 connections
• New Recommendation I.35av decided by 2001 or 2002.
• Revised Recommendations I.357 by 2002.

Relationships