ZyXEL XGS-4728F User Guide - Page 114
Table 14
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Chapter 8 Basic Setting Table 14 Basic Setting > 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, 10M/Half Duplex, 10M/Full Duplex, 100M/Half Duplex and 100M/Full Duplex for a 1000Base-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. 12G/Full Duplex is supported by the 10GBase-CX4 connections in the XGS-4528F or XGS-4728F. 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 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. 802.1p Priority BPDU Control 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 Table 12 on page 108 for more information. 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. CX4 Cable Select Network to process a BPDU with no VLAN tag and forward a tagged BPDU. For the XGS-4526, this field is available when you install an EM-412 module in the Switch's optional uplink module slot (see Section 3.2 on page 41). Select the number of meters for the length of the 10GBASE-CX4 cable you use to connect between the Switch and another switch for stacking. 114 XGS-4526/4528F/4728F User's Guide