Issue link: https://www.e-digitaleditions.com/i/1255991
July/August/September 2020 I 15 systems, it is recommended to set the value to high. In cases when the network system is not congested, the DSCP value can be set to best effort (Figure 8). Latency Audiovisual over IP is used to deliver content and infor- mation to the audience that may be located in the same room as the content source or in other places within the enterprise. In cases when the audience is in the same room, such as a study hall, meeting space or conference room, the tolerance for delay or latency is very low. On the other hand, when the content source and audience are in different locations, the tolerance for latency is higher and less strict. Audiovisual over IP systems will introduce latency, mainly because of the video and audio processing that takes place within the devices. Some AVoIP devices will consume more time to process video and audio and oth- ers will require less. It is imperative to ensure that when AVoIP is installed, the minimum latency available is introduced. Based on customer experiments and industry best practices, Table 2 can be used to better understand the tolerable latency map against use cases. In cases where the network switch or switches are not loaded and are properly managed, the majority of the latency budget will be consumed by the AVoIP network devices. It is recommended that systems inte- grators who install AVoIP introduce less than 10 ms latency when the encoder and decoder are connected back-to-back. Security Network security is among the top priorities for an AVoIP installation or network device. Devices require security protocols around authentication and authorization. There are instances where rogue machines are plugged into a university network, for example, disguised as a legiti- mate element of the network. Proper authentication and authorization protocols prevent unlawful monitor- ing of traffic and theft of content and information. FIGURE 8: Image taken from AV over IP encoder with QoS DSCP configuration set to Best effort. Video Encoder Enable Destination IP address 225.0.0.7 FEC rows 15 FEC columns 15 Destination UDP port 1000 TTL 255 DSCP FEC enable Best effort vc2_encoder1 TABLE 2: Tolerable latency map per use cases. Description Use Case Small conference rooms Soft codec, with no sound amplification, ability to switch between several sources Large conference rooms Presenter's voice is amplified (ceiling or on-wall speakers), audio DSP processing Auditorium and image magnifications Video of presenter is projected to improve viewing ability, audio amplification is used Room overflow with interactive Q&A Presenter in one room, overflow audience in other room with ability to interact (Q&A) Room overflow with no interactive Q&A Presenter in one room, overflow audience in other room with no ability to interact (view only) < 18 ms < 18-25 ms < 20 ms < 35 ms 2-4 sec Maximum Latency