ZyXEL Communications XS3800-28 User Manual page 272

Table 118 PORT > Port Setup (continued)
LABEL DESCRIPTION
Speed/Duplex Select the speed and the duplex mode of the Ethernet connection on this port. The choices are
Auto, Auto-1G, 100-an (100M/auto-negotiation), 2.5G / Full Duplex, 5G / Full Duplex, and 100M /
Full Duplex for a 100Base-T connection. 1G / Full Duplex is supported by both 1000Base-T and
1000Base-X connections. 10G / Full Duplex is supported by the 10 Gigabit Ethernet connections
on the Switch that has a 10 Gigabit interface.
Selecting Auto-1G or 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 IEEE 802.3x flow control in full duplex mode and backpressure flow control in half
duplex mode.
IEEE 802.3x 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 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 Disable.
802.1p Priority This priority value is added to incoming frames without a (802.1p) tag.
BPDU Ctrl Configure the way to treat BPDUs received on this port. You must activate Bridging Control
Protocol Transparency in the SYSTEM > Switch Setup screen first.
Select Peer to process any BPDU (Bridge Protocol Data Units) received on this port.
Select Tunnel to forward BPDUs received on this port.
Select Discard to drop any BPDU received on this port.
Select Network to process a BPDU with no VLAN tag and forward a tagged BPDU.
Media Type You can insert either an SFP+ transceiver or an SFP+ Direct Attach Copper (DAC) cable into the
10 Gigabit interface of the Switch.
Select the media type (SFP+ or DAC10G) of the SFP+ module that is attached to the 10 Gigabit
interface.
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.
Chapter 37 Port Setup
XS3800-28 User's Guide
272