System and methods for measuring quality of commun

专利名称：System and methods for measuring quality

of communications over packet networks

发明人：Peng Zhang,Tzuoh-Ying Su申请号：US09650060申请日：20000829公开号：US06775240B1公开日：20040810

专利附图：

摘要：A communications quality measurement system for use with packet and othernetworks comprises a test signal transmitter, a test signal receiver, and a test signalanalyzer. A test transmitter is used to produce a series of test signals selected or

engineered for measuring one or more desired Quality of Service or other performanceparameters of a network path to be tested. A first copy of the test signal is transmittedvia a reference path of known characteristics and with minimal impairments. A secondcopy of the test signal is transmitted via the network path to be tested. A test receiverreceives and records the signals which were carried via the reference and test paths. Atest signal analyzer compares the signals received over the reference and test paths andanalyzes differences to determine Quality of Service or other parameters, such as BearerDelay, Cell or Packet Loss, Echo Delay, and Echo Amplitude, some of which are directedto the particular impairments that are characteristic of packet networks. The test signal ispreferably injected into and received from handset analog audio paths of originating andterminating subscriber terminals, so that the effects of nearly all network componentswill be measured.

申请人：LUCENT TECHNOLOGIES INC.

代理人：Neil Ormos,Steven R. Santema

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