The CELUImpacto operator, with new headquarters in the city of Santiago, requires qualified personnel in the network area, specifically in supporting video transmission over data networks, in order to offer quality services related to VoIP telephony. The requested personnel must offer support to avoid possible failures linked to factors that may affect the quality of video over data networks. It should be considered that the company has a dedicated 50 Mbps link, available for 100 users in the company. Therefore, you are hired by the company to evaluate the factors that affect the quality of video over packet networks, including compression factor, packet loss and jitter. 

 

 

1. Point out what factors affect the compression of video over networks in the company, estimating that 70 users periodically and simultaneously transmit video calls. The purpose is to be able to detect delays in video transmission to achieve the expected quality of service. (Consider that the video digitization process makes use of motion prediction and compensation techniques, which sometimes generate quantization noise.) 

 

2. The compression process uses algorithms for digital video coding, which may vary according to their characteristics and techniques. Considering a 50% increase in users on the network, how does the Reversible (lossless) technique work to guarantee quality of service (QsO) and correct video quality configuration? 

 

3. If all users in the company must connect to video calls simultaneously, what effects can packet loss produce and how does it affect the quality of the video over data networks? How does this influence the user's perception and expectation final regarding the quality of the video sent and received?