Integrated network evaluation troubleshooting tool
Devices, systems and methods for determining the amount of latency between a video core and a remote device by inserting null packets in a data stream between the video core and the remote device, the null packets including respective time stamps demarking respective times of departure from the video core.
1 . An apparatus configured for operation in a distributed access architecture having a remote device connected to a video core and having a dejitter buffer, the remote device configured to remove null packets from the dejitter buffer, where the apparatus uses information in the null packets to determine an amount of latency between the remote device and the video core.
2 . The apparatus of claim 1 where the information in the null packets comprises time stamp information.
3 . The apparatus of claim 1 where the time stamp information includes a time that the null packet was sent from the video core to the remote device.
4 . The apparatus of claim 1 where the time stamp information includes a time that the null packet arrived at the remote device.
5 . A remote device connected to a video core in a distributed access architecture and having a dejitter buffer, the dejitter buffer receiving a null packet in a video stream from the video core, the remote device configured to extract a first time stamp from the null packet and associate a second time stamp with the first time stamp, the second time stamp indicating a time of arrival of the null packet at the remote device.
6 . The remote device of claim 5 configured to store the first time stamp and the second time stamp in a log.
7 . A method for determining at least one of latency and jitter experienced in a network connection between a video core and a remote device of a distributed access architecture, the method comprising:
(a) inserting, by a video core, a second time stamp in a field of a null packet contained within an MPEG transport stream;
(b) sending, by a video core, the MPEG transport stream to a remote device in a distributed access architecture;
(c) determining, by the remote device, a time of arrival of the null packet using a second time stamp;
(d) recording, by the remote device, the first time stamp and the second time stamp in a log;
(e) repeating steps (a) to (d) for a plurality of null packets in the MPEG transport stream; and
(f) using the time stamps in the log to measure at least one of latency and jitter in the network connection.
8 . The method of claim 7 where the second time stamp is based on a clock in the remote device.
9 . The method of claim 7 where the second time stamp is based on synchronization data sent from the video core.