Agilent Technologies, Inc.

Hewlett-packard Company

James P Quan

Samuel M Bauer

Justin S Morrill, Jr

Jeffrey Tomberlin

Justin S Morrill

A system and method to test voice quality over a call path on a packet based network. A call signaling path is established between a first voice quality tester (VQT) and a second VQT. The call signaling path includes one among multiple call signaling stacks, each operating according to a particular call signaling protocol. By using a graphical user interface (GUI), a user can select the call signaling stack to be used, and change between call signaling stacks in real time.

Method of switching between multiple call signaling protocol stacks in a voice quality tester and apparatus using same

Methods and devices for evaluating audio quality in a network are described. First and second audio samples are compared. The first audio sample includes a reference signal that is transmitted through a path on the network. The second audio sample includes the reference signal after it has traveled the path and is received. In addition, network performance while the reference signal travels the path is monitored. The results of the comparison are correlated with network performance statistics derived from the monitoring.

Methods and devices for correlating audio sample comparisons and network performance statistics

Disclosed is a communications measurement matrix display for a protocol analyzer which is used to monitor traffic on a packet-switched network. The display allows the protocol analyser user to see, at a glance, a complete and accurate overview of communications between more than thirty-one nodes on a packet-switched network, over a user selectable range of measurement-time intervals. The matrix display has two modes. One mode shows the source versus the destination nodes of the network as a 32-.times.-32 two-dimensional X-Y grid matrix having thirty one source nodes ordinally indicated along one grid axis and thirty one destination nodes ordinally indicated along the other grid axis. The thirty second ordinal position on each axis designates any nodes other than the first thirty one nodes. A display marker postioned on the grid indicates communication between the source node and the destination node which correspond to the (X,Y), that is, the (SOURCE, DESTINATION), coordinates of the marker. In a second mode, the display shows the node connections only: the display is simply a 32-.times.-32 two-dimensional X-Y grid having thirty two nodes ordinally indicated on each axis without direction, such as source or destination, indicated. The display of the second mode is essentially the display of the first mode folded onto itself. The matrix display, in both modes, is particularly well suited to the IEEE 802.3 Local Area Network packet-switched network. The matrix display is accomplished usng a combination of dedicated hardware and real-time software.

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Colorado Springs, CO, United States of America

James P Quan