Patent ID: 8331246
Filing Date: 2012-12-11
Classification: H04L

Abstract:
1. A measurement system for generating a transit metric, the apparatus comprising: a first probe for coupling to a first point in a communications network; a second probe for coupling to a second point in the communications network; a first data record builder associated with the first probe and arranged to generate, when in use, a first record comprising first observation data relating to a transaction comprising a plurality of messages exchanged among devices on the communications network, the first observation data comprising a time stamp of a final message of the transaction recorded by the first data record builder, the first data record builder configured to forward the first record upon completion of the transaction; a second data record builder associated with the second probe and arranged to generate, when in use, a second record comprising second observation data relating to the transaction, the second observation data comprising a time stamp of a final message of the transaction recorded by the second data record builder, the second data record builder configured to forward the second record upon completion of the transaction; a correlator arranged to receive the first and second records and to generate a query to determine, when in use, that the first and second records relate to the transaction and to filter the first and second records relating to the transaction to obtain records having final message timestamps within a predetermined period of time; and a measurement component arranged to use, when in use, at least respective parts of the first and second records having final message timestamps within the predetermined period of time to calculate a transit metric related to the transaction.