ZyXEL Communications VES-1124 -, Руководство пользователя

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VES-1124 User’s Guide
6-12 Basic Setting
Table 6-5 Port Setup
LABEL DESCRIPTION
Port This is the port index number.
Active Select this check box to enable a port. A port must be enabled for data transmission to occur.
Name Enter a descriptive name that identifies this port.
Type This field displays either VDSL or 10/100M for port type.
Profile This is a pre-configured profile associated with your port. Select a VDSL profile from the drop down-
list box.
Use the VDSL Profile Setup screen to configure a new profile or edit an existing profile. Refer to
Section 6.11 for more information.
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 and 100M/Full Duplex .
Selecting Auto (auto-negotiation) makes one Ethernet port able to negotiate with a peer
automatically to obtain the connection speed and duplex mode that both ends support. When auto-
negotiation is turned on, an Ethernet port on the switch negotiates with the peer automatically to
determine the connection speed and duplex mode. If the peer Ethernet 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, an
Ethernet 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 Ethernet 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 this option to enable it.
802.1p
Priority Use this field to specify to which queue the switch assigns the (tagged or untagged) packets
received on this port. This overrides the switch’s device-wide IEEE 802.1p priority level to queue
mapping (see
Priority Queue Assignment in Table 6-3 for more information.
Select High to assign the packets to the high priority queue. Select Low to assign the packets to the
low priority queue. Traffic assigned to the high priority queue gets through faster while traffic in the
low priority queue is dropped if the network is congested. See also
Queuing Method for related
information.
Select None to forward the tagged packets based on the priority level in their tags. By default the
switch treats untagged packets as priority level 0.
Apply Click Apply to save your changes back to the switch.