• Client Mode: In client mode, the gateway joins an existing wireless network, like the user's portable devices that are sharing AV content.
• Bridge (AP Client) Mode: In AP Client mode, the DHCP server of the gateway is disabled and another router within the network issues IP addresses and manages access of wireless users. This mode can extend the reach of an existing wireless network.
non-overlapping channels create more risk of inter- ference. A good approach for 5 and 6 GHz in dense deployments is to take a “cut and try” approach, using the widest possible channel without causing RF interference or contention on the network. FACTORS THAT IMPACT BANDWIDTH Many factors influence the bandwidth demands of Wi-Fi collaboration gateways that carry AV content. The greatest impact on bandwidth is whether the AV content is static images or full-motion video. Some common AV content types and their bandwidth consumption (in Mbps) are shown in Figure 8. Typical bandwidth use varies based on the AV content that is being shown: static images or full- motion video images. Sharing static images such as (non-animated) slide presentations and PDF files results in short bursts of data associated with each refresh or change in content. When sharing full- motion video, the bandwidth demand increases accordingly. Figure 8 contains a bandwidth and frame rate table which provides an approximation of the bandwidth requirements of various types
of AV traffic for a typical Wi-Fi collaboration gateway operating on a network. Figure 9 shows two plots of data throughput for wireless traffic consisting of static images and full- motion video images, respectively. For static images, each burst of data indicates when a new image file is displayed. For full-motion video images, the initial data traffic peaks with the buffering of the file, then drops as playback begins. Wi-Fi Collaboration Gateway Operational Modes (Integrated WAP) When a collaboration gateway is equipped with built-in Wi-Fi, it can be set up as an AP, a client, or an access point client. • AP Mode: In AP mode, the gateway functions as a standalone AP for wireless connections and uses a built-in Dynamic Host Configuration Protocol (DHCP) server to issue IP addresses and manage access of wireless users to the wired network to which it is connected.
FIGURE 8 . Wi-Fi collaboration gateway approximate bandwidth use based on AV content type. Source: Extron
FIGURE 7 . Non-overlapping channel assignments for sparse and dense Wi-Fi deployments at 2.4 GHz and number of non- overlapping channels on all Wi-Fi bands. Source: Extron
FIGURE 9 . Data throughput plots of time vs data rate for static images and full-motion video images. Source: Extron
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