ZyXEL Communications GS1350 Series, Руководство пользователя

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Chapter 48 Port
GS1350 Series User’s Guide
341
The following table describes the labels in this screen.
Table 170 Port > Port Setup
LABEL DESCRIPTION
Port This is the port index number.
* Settings in this row apply to all ports.
Use this row only if you want to make some settings the same for all ports. Use this row first to set
the common settings and then make adjustments on a port-by-port basis.
Note: Changes in this row are copied to all the ports as soon as you make them.
Active Select this check box to enable a port. The factory default for all ports is enabled. A port must be
enabled for data transmission to occur.
Name Enter a descriptive name that identifies this port. You can enter up to 64 alpha-numerical
characters.
Note: Due to space limitation, the port name may be truncated in some Web
Configurator screens.
Speed/Duplex Select the speed and the duplex mode of the Ethernet connection on this port. Choices are
Auto , 10-an (10M/auto-negotiation), 10M/Half Duplex , 10M/Full Duplex , 100-an (100M/auto-
negotiation), 100M/Half Duplex , 100M/Full Duplex and 1G/Full Duplex (Gigabit connections only).
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.
Extended
Range Select this check box to extend the PoE range up to 250 meters.
After you enable this feature, the port will transfer data at a rate up to10 Mbps in full duplex
mode. If a PD is connected to the port, the Switch follows the IEEE 802.3at PoE+ standard to
supply power to the connected PD during power-up.
Note: Maximum PoE power that can be supplied to a PD at 250 m is 15 W.
Note: If you enable extended range on a port after the connected PD starts up
completely, you must disable PoE and enable it again or disconnect and
reconnect the cable to the port for extended mode to take effect.
Note: The port speed and duplex mode you previously configured will be applied
automatically when the extend range feature is disabled.
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 Priority This priority value is added to incoming frames without a (802.1p) priority queue tag. See Priority
Queue Assignment in Table 168 on page 336 for more information.