Poe - ZyXEL Communications XGS3700-48 User Manual

Table 18 Basic Setting > Port Setup (continued)
LABEL
Speed/Duplex
Flow Control
802.1p Priority
BPDU Control
Media Type
Apply
Cancel

6.7 PoE

Note: The PoE function and the following screens are available for models ending in "HP"
only.
Chapter 6 Basic Setting
DESCRIPTION
Select the speed and the duplex mode of the Ethernet connection on this port. The choices
are Auto, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex and 100M/Full
Duplex for a 100Base-T connection. 1000M/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 (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.
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 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
Configure the way to treat BPDUs received on this port. You must activate bridging control
protocol transparency in the 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.
On the Switch that has a 10 Gigabit interface, such as the SFP+ slot, you can insert either
an SFP+ transceiver or an SFP+ Direct Attach Copper (DAC). An SFP+ Direct Attach Copper
(DAC) is an SFP+ housing that has no optical module but uses a fixed-length passive copper
cable assembly, which reduces cost and power significantly.
Select the media type (sfp_plus or dac10g) of the SFP+ module that is attached to the 10
Gigabit interface.
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.
GS3700/XGS3700 Series User's Guide
Table 13 on page 64
72
for more information.