Method and apparatus for measuring one way transmission delay

A computer-readable medium having stored thereon a plurality of instructions, the plurality of instructions including instructions which, when executed by a processor, cause the processor to perform the steps of a method for measuring a transmission delay, comprising:

• measuring a first roundtrip delay (RTD1) at a first location between a first endpoint and a second endpoint over a first communication network;
• measuring a second roundtrip delay (RTD2) at said first location between a third endpoint and a fourth endpoint over a second communication network with symmetric delay characteristics;
• and
• performing synchronous recordings of a test signal that is sent simultaneously from said second endpoint to said first endpoint and from said fourth endpoint to said third endpoint, to measure an arrival time (t1) of said test signal over said first communication network, and, an arrival time (t2) of said test signal over said second communication network t2, where said arrival times (t1) and (t2) are used to calculate an one way transmission delay in said first communication network.

An apparatus for measuring a transmission delay, comprising:

• means for measuring a first roundtrip delay (RTD1) at a first location between a first endpoint and a second endpoint over a first communication network;
• means for measuring a second roundtrip delay (RTD2) at said first location between a third endpoint and a fourth endpoint over a second communication network with symmetric delay characteristics;
• and
• means for performing synchronous recordings of a test signal that is sent simultaneously from said second endpoint to said first endpoint and from said fourth endpoint to said third endpoint, to measure an arrival time (t1) of said test signal over said first communication network, and, an arrival time (t2) of said test signal over said second communication network t2, where said arrival times (t1) and (t2) are used to calculate an one way transmission delay in said first communication network.