Regarding the operation of CPT mode

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Regarding the operation of CPT mode

Post by jushshrestha on Tue Oct 22, 2013 9:56 am

Dear All,

This is to inform you that I was in Yangon, Myanmar on 16th and 17th of October for demo of WMT Expert and the server was in Thailand. The average BW is very low in Yangon as there is only one telecom operator. The level of BW fluctuation is also very high in Yangon. Even in LAN connection the BW was fluctuating, We tried to use CPT mode. we tried to use the LAN connection in the DVB office at Yangon. Even the LAN connection was not stable. when we use CPT mode with low bit- range the video packets were being sent smoothly but the video quality was not good as it was sending in small packets. when we try to increase the bit- range for bigger packet size, it was difficult to send the packets from expert to server due to unstable BW. We use the CPT mode in all segments delay, starting from 1 segment(15 secs delay) to 8 segments delay( 120 secs). when we tried the delay of 90 seconds in the bit-range of 100 kbps to - 500 Kbps, the video packets were being sent smoothly but the packet size were small(393 KB) and Samrat who was in Thailand at the server setup, told me that the quality of video was not good. Could any one suggest me on this, i would appreciate for your advice.

Jush Shrestha
MVP
BKK Office

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Re: Regarding the operation of CPT mode

Post by Admin on Tue Oct 22, 2013 12:09 pm

Please read the already posted information

Although everyone has been trained and explanations have been provided to all staff, regarding CPT Mode, what it is and how it works. Customers are still being provided the incorrect information. Please understand that CPT Mode is a very specific mode used in very specific circumstances. It cannot be told to customers that our units work in areas with low bandwidth because we have the ability to operate in CPT Mode. This is completely false and very misleading. CPT Mode was created to provide a dual buffering solution for transmitting video during times of BANDWIDTH FLUCTUATION ONLY !!! This means that you cannot operate in CPT Mode when you have continuously low bandwidth conditions. CPT Mode requires and average overall bandwidth over a given period of time in order to process the video from the front end buffering. CPT Mode works best in conditions where bandwidth fluctuates from low to high or vice versa, but you are still able to achieve an overall average bandwidth over a given period of time in order to send the video without any packet loss or frame drop. This mode works best when traveling over large distances where you may have low bandwidth or lose bandwidth sporadically, however, you are also having good bandwidth in certain areas so that the minimum average is able to be achieved. If you are in areas of continuous low bandwidth or no bandwidth, you are better off using a very long latency or store/forward.

Please understand this concept, as customers are being promised attributes of a technology that does not exist and cannot be achieved.
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Re: Regarding the operation of CPT mode

Post by jushshrestha on Fri Oct 25, 2013 5:02 pm

Thank you for the information.

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Re: Regarding the operation of CPT mode

Post by Mandeep singh on Fri Oct 25, 2013 6:21 pm

Dear Sir,

Thanks to share the correct information regarding CPT mode some time we confused regarding the exact purpose of CPT mode now it will help to present the CPT mode to client it is very good feature in WMT

Mandeep singh

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Re: Regarding the operation of CPT mode

Post by Guest on Mon Oct 28, 2013 1:07 pm

Thank you for the information regarding CPT mode.

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