Chapter 8 Basic Setting
GS2220 Series User’s Guide
114
8.8 Po E Sta tus
Note: The following screens are available for the PoE models only.
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.
Fig ure 91 Powered Device Examples
You can also set priorities so that the Switch is able to reserve and allocate power to certain PDs.
Flow Control A concentration of traffic on a port decreases port bandwidth and overflows buffer memory
causing packet discards and frame losses. Flo w C o ntro l 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.
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 C o ntro l to enable it.
Select Tx Rx to allow the Switch port to send pause signal to the connected device, and for the
connected device to send a pause signal to the Switch. The Switch will temporarily stop sending
signals after receiving pause signal.
Select Tx to allow the Switch port to send pause signal to the connected device.
Select Rx to allow the connected device to send a pause signal to the Switch. The Switch will
temporarily stop sending signals.
Otherwise, select Disa b le .
802.1p Priority This priority value is added to incoming frames without a (802.1p) priority queue tag. See Prio rity
Q ue ue A ssig nme nt in
Table 27 on page 106 for more information.
Apply 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 Sa ve link on the top navigation panel to save
your changes to the non-volatile memory when you are done configuring.
Cancel Click C a nc e l to begin configuring this screen afresh.
Table 33 Basic Setting > Port Setup (continued)
LABEL DESCRIPTIO N
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