Agilent Technologies 37907A Manual do Utilizador descarregar pdf (Página 17)

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Figure 7: Traffic configuration shaping of test cell traffic and background traffic.

There are two sides to any contract and ATM traffic contracts are no

exception. If the user traffic keeps to its contract obligations then the

network should deliver the quality of service it guarantees in the traffic

contract. This is usually specified in terms of cell loss and added cell

delay variation, etc.

The ATM software is able to measure ATM layer QoS by generating test

traffic shaped to meet the traffic contract in terms of PCR, CDVT,

SCR and MBS; it also allows users to choose the standardized ‘‘Generic

List’’ values for the parameters. The test traffic comprises test cells

which conform to ITU- T Recommendation O.191 which specifies the test

cell and the methodology for measuring ATM layer QoS parameters

specified in ITU- T Recommendations I.356 and I.357, and the ATM

Forum’s Traffic Management Specification version 4.1.

Measurements made by the ATM software are as follows:

Cell Loss Ratio

Cell Misinsertion Rate

Cell Error Ratio

Cell Delay Variation

Mean Cell Transfer Delay Minimum

Cell Transfer Delay

Maximum Cell Transfer Delay

Severly Errored Cell Block Ratio

Availability Ratio

Transmitted Cells

Non- Conforming Cells

Tagged Cell

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Agilent Technologies 37907A Manual do Utilizador Página 17