ZyXEL Communications ES3500 Series 8.8 PoE, fill, Apply, 802.1p, Cancel, Cancel, selected, Priority, be selected, Speed/Duplex, Flow Control, Flow Control, half duplex mode, Table 15 on page

Chapter 8 Basic Setting

Table 17 Basic Setting > Port Setup (continued)

LABEL	DESCRIPTION
Speed/Duplex	Select the speed and the duplex mode of the Ethernet connection on this port. Choices are
	Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex, 100M/Full Duplex and
	1000M/Full Duplex (Gigabit connections only).
	The dual-personality interfaces with the RJ-45 port active allow 10/100/1000 Mbps speeds to
	be selected.
	The dual-personality interfaces with the SFP port active allow 100/1000 Mbps speeds to be
	selected.
	Selecting Auto (auto-negotiation) allows one port to negotiate with a peer port automatically
	to obtain the connection speed 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.
Flow Control	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.
802.1p	This priority value is added to incoming frames without a (802.1p) priority queue tag. See
Priority	Priority Queue Assignment in Table 15 on page 89 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 Save link on the top navigation panel to
	save your changes to the non-volatile memory when you are done configuring.
Cancel	Click Cancel to begin configuring this screen afresh.

8.8 PoE

Note: The following screens are available for the ES3500-24HP model only.

The ES3500-24HP supports the IEEE 802.3at Power over Ethernet plus (PoE+) standard. The Switch is Power Sourcing Equipment (PSE) because it provides a source of power via its Ethernet ports, and each device that receives power through an Ethernet port is a Powered Device (PD).

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	ES3500 Series User’s Guide