Hello, everyone. I want to share a knowledge of factors of an IP Network That Affect Videoconferencing Services Out-of-order delivery.
Out-of-order delivery is the delivery of data packets in a different order from which they are sent. Out-of-order delivery can be caused by packets following different network paths or parallel processing paths within network devices that are not designed to ensure that packet ordering is preserved.
A receiving end must display the video in the original sequence because real-time communication is required in a video conference. Although the receiving end has buffer space (a large buffer increases the delay), packet loss will occur if the size of out-of-order packets exceeds the buffer space.
The following uses an MCU as an example. The same processing procedure applies to an endpoint.
Description:
As shown in the preceding figure, fours out-of-order packets exist on line 1 in a multipoint conference.
The MCU receives streams from endpoint 1. The MCU sorts the packets when receiving packet 5. Assume that the default buffering time is 60 ms (for three packets).
When packets 5, 6, and 7 are received, the buffer is full. Therefore, the MCU has to send the three packets directly.
When packet 4 arrives at the MCU, the MCU discards the packet because it has outdated.
Packet 4 is counted as a discarded packet.
Conclusion
The above scenarios are completed in the laboratory environment, If you have any questions, welcome to reply and exchange, looking forward to your reply and good comments. thank you.
