Poe Status - ZyXEL Communications GS2210 Series User Manual

Table 16 Basic Setting > Port Setup (continued)
LABEL
Speed/Duplex
Flow Control
802.1p
Priority
Apply
Cancel

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 8 for GS2210-8HP, 1 to 24 for GS2210-
24HP and 1 to 48 for GS2210-48HP).
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.
Chapter 8 Basic Setting
DESCRIPTION
Select the speed and the duplex mode of the Ethernet connection on this port. Choices are
Auto-1000M, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full
Duplex and 1000M/Full Duplex (Gigabit connections only).
Selecting Auto-1000M (auto-negotiation) allows one port to negotiate with a peer port
automatically to obtain the connection speed (of up to 1000M) and duplex mode that both
ends support. When auto-negotiation is turned on, a port on the Switch negotiates with the
peer automatically to determine the connection speed and duplex mode. If the peer port
does not support auto-negotiation or turns off this feature, the Switch determines the
connection speed by detecting the signal on the cable and using half duplex mode. When the
Switch's auto-negotiation is turned off, a port uses the pre-configured speed and duplex
mode when making a connection, thus requiring you to make sure that the settings of the
peer port are the same in order to connect.
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.
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
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.
GS2210 Series User's Guide
Table 14 on page 69 for more information.
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