ZyXEL GS1920 Series User Guide - Page 69
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Chapter 8 Basic Setting Table 14 Basic Setting > Port Setup (continued) LABEL Flow Control DESCRIPTION A concentration of traffic on a port decreases port bandwidth and overflows buffer memory causing packet discards and frame losses. Flow Control is used to regulate transmission of signals to match the bandwidth of the receiving port. The Switch uses IEEE802.3x flow control in full duplex mode and backpressure flow control in half duplex mode. IEEE802.3x flow control is used in full duplex mode to send a pause signal to the sending port, causing it to temporarily stop sending signals when the receiving port memory buffers fill. 802.1p Priority Apply Cancel Back Pressure flow control is typically used in half duplex mode to send a "collision" signal to the sending port (mimicking a state of packet collision) causing the sending port to temporarily stop sending signals and resend later. Select Flow Control to enable it. This priority value is added to incoming frames without a (802.1p) priority queue tag. See Priority Queue Assignment in Table 12 on page 64 for more information. Click Apply to save your changes to the Switch's run-time memory. The Switch loses these changes if it is turned off or loses power, so use the Save link on the top navigation panel to save your changes to the non-volatile memory when you are done configuring. Click Cancel to begin configuring this screen afresh. 8.8 PoE Status Note: The following screens are available for the PoE model(s) only. Some features are only available for the Ethernet ports (1 to 24 for GS1920-24HP and 1 to 48 for GS1920-48HP). The PoE model(s) supports the IEEE 802.3at High Power over Ethernet (PoE) standard. A powered device (PD) is a device such as an access point or a switch, that supports PoE (Power over Ethernet) so that it can receive power from another device through an Ethernet port. In the figure below, the IP camera and IP phone get their power directly from the Switch. Aside from minimizing the need for cables and wires, PoE removes the hassle of trying to find a nearby electric outlet to power up devices. Figure 51 Powered Device Examples You can also set priorities so that the Switch is able to reserve and allocate power to certain PDs. Note: The POE (Power over Ethernet) devices that supply or receive power and their connected Ethernet cables must all be completely indoors. GS1920 Series User's Guide 69