AT&T Intellectual Property I, LP

At&t Labs, Inc.

Barbara Smith

Jonathan Roll

Joel Freeman

Matthew Wayne Stafford

Weijing Chen

Haifeng Bi

Bruce Allen Nance

George C Allen, Jr

Tina M Sigarto

Janice Elaine Doerner

Mehran Esfandiari

Gary Jonathan Gibbons

Paul August Kaschube

John Pinch

George Anthony Young

Randy Beamon

Methods and apparatus for performing non-intrusive data link layer performance measurement in communication networks are disclosed. An example method to measure data link layer performance between existing network nodes disclosed herein comprises coupling a first intelligent network interface (INI) to an available access port of a first existing network node providing access to a network, wherein the first INI obtains power and input information only from the access port after being coupled thereto, and exchanging test messages between the first INI and a second INI coupled to a second existing network node during normal operation of the first and second existing network nodes to measure data link layer performance, wherein the test messages originate in the first INI and are routed through the first and second existing network nodes using a first data link layer address associated with the first INI and a second data link layer address associated with the second INI.

Methods and apparatus for performing non-intrusive data link layer performance measurement in communication networks

Methods and apparatus for performing non-intrusive network layer performance measurement in communication networks are disclosed. An example method to measure network layer performance between existing network nodes disclosed herein comprises coupling a first intelligent network interface (INI) to an available access port of a first existing network node providing access to a network, wherein the first INI obtains power and input information only from the access port after being coupled thereto, and exchanging test messages between the first INI and a second INI coupled to a second existing network node during normal operation of the first and second existing network nodes to measure network layer performance, wherein the test messages originate in the first INI and are routed through the first and second existing network nodes using a first network layer address associated with the first INI and a second network layer address associated with the second INI.

Methods and apparatus for performing non-intrusive network layer performance measurement in communication networks

A system and method for reducing and surviving failures in a voice trunking over ATM (VTOA) environment includes an ATM network having a plurality of interconnected ATM switches. The VTOA system also includes a CS-IWF complex having a plurality of interconnected CS-IWF units, each unit having a plurality of processors. An end office building may also be provided for interaction with the VTOA system. The end office building includes multiple T-IWFs, and a switch that distributes calls among the T-IWFs in a load sharing manner. Each T-IWF has a plurality of processors and is part of the VTOA system. A switch management system is also provided in the VTOA system. In order to reduce and survive failures, the switch management system includes a plurality of switch management system units. At least one of the switch management system units is a backup unit for at least one primary switch management system unit. Each switch management system unit provides application redundancy within itself.

Fault tolerant virtual tandem switch

Growing community of inventors

San Antonio, TX, United States of America

Barbara Smith