Question about Sony PCS-1 (PCS1) Video Conference

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Packet Loss and Video Freezing Up

We are experiencing packet loss pop ups and after 10 minutes the screen freezes, where should I start?



We are currently having some problems receiving the video stream from our counterparts in China. Somehow 50% of the total packets gets lost and none are getting recovered. The video becomes so pixelated that you can't even see a clear image of what's in front of you. We have tested several resolution to fix the issue but none were successful. We did changed the bandwidth from 1024 to 4Mbps. Currently our counterparts from China can see our video clearly. We went to our vendor and did some tests at their showroom, to see whether the problem might be with our internet provider, using the same codec (PCS-G50) we did get the same result. They can see us clearly but from our end we lose a lot of packets and see a lot of pixelations and smears. Also just to add we did configure our firewall and set up the IP address of the codec outside of the firewall to avoid any filters and blockages, yet we were not successful. Please help us and see maybe there is way for us to recover the packet loss.

Thanks,

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  • artit Mar 10, 2008

    Also we are located in Vancouver, Canada.

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Hi artit,

I had the same problem with heavy packet lost after 10 minutes connection between Singapore and USA. We are using ADSL line and Sony PCS-G50 for video conferencing. After a much trouble-shooting, we identified that the nature of the problem lies with the Internet Service Provider's back-end server. The server has difficulties handling large and constant data packets. This could be due to the reasons that ISP using routers with more hops and small pipes. We immediately changed the ISP to a more reputated one (with better infrastructure) and now, we have a much better quality video.

Posted on Oct 20, 2008

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Hi,

I assume that you are running the current Sony PCS-G50 Firmware?

Best regards,

Andy

Posted on Feb 19, 2009

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Posted on Mar 27, 2008

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The triumvirate of network performance metrics are packet loss, latency and jitter.

Almost all network applications use TCP (Transmission Control Protocol) to get their data from point A to point B. About 85% of the overall internet's traffic is TCP, of which specific aspect is that it completely hides the packet-based nature of the network from applications. Whether an application hands a single character or a multi-megabyte file to TCP, puts the data in packets and sends it on its way over the network. The internet is a scary place for packets trying to find their way: it's not uncommon for packets to be lost and never make it across, or to arrive in a different order than they were transmitted. TCP retransmits lost packets and puts data back in the original order if needed before it hands over the data to the receiver. This way, applications don't have to worry about those eventualities.

Network latency
TCP has a number of mechanisms to get good performance in the presence of high latencies:
1) Make sure enough packets are kept "in flight". Simply sending one packet and then waiting for the other side to say "got it, send then next one" doesn't cut it; that would limit throughput to five packets per second on a path with a 200 ms RTT. So TCP tries to make sure it sends enough packets to fill up the link, but not so many that it oversaturates the link or path. This works well for big data transfers.
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Packets are lost in networks for two reasons:
1) Every transmission medium will flip a bit once in a while, and then the whole packet is lost. Wireless typically sends extra error correction bits, but those can only do so much. If such an error occurs, the lost packet needs to be retransmitted. This can hold up a transfer.
But if network latency or packet loss get too high, TCP will run out of buffer space and the transfer has to stop until the retransmitted lost packet has been received. In other words: high latency or high loss isn't great, but still workable, but high latency and high loss together can slow down TCP to a crawl.
2) Another reason packets get lost is too many packets in a short time: TCP is sending so fast that router/switch buffers fill up faster than packets can be transmitted.If TCP has determined that the network can only bear very conservative data transfer speeds, and slow start really does its name justice, it's faster to stop a download and restart it rather than to wait for TCP to recover.
Jitter - is the difference between the latency from packet to packet
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In conclusion, in networks that use multiple connections to the internet, it can really pay off to avoid paths that are much longer and thus incur a higher latency than alternative paths to the same destination, as well as congested paths with elevated packet loss. The path selecting process can be performed automatically: learnhow to automate evaluation of packet loss and latencyacross multiple providers to choose the best performing route.

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