ZyXEL P-336M User Guide - Page 61
Wireless
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ZyXEL P-336M User's Guide Table 25 Advanced: Inbound Filter (continued) LABEL DESCRIPTION Action This field displays the action on the packets from the specified IP address range. Source IP Range This field displays the source IP address range(s). 4.11 Wireless This section describes advanced wireless LAN features. For more information, refer to Section 3.5 on page 33. 4.11.1 RTS/CTS A hidden node occurs when two stations are within range of the same access point, but are not within range of each other. The following figure illustrates a hidden node. Both stations (STA) are within range of the access point (AP) or wireless gateway, but out-of-range of each other, so they cannot "hear" each other, that is they do not know if the channel is currently being used. Therefore, they are considered hidden from each other. Figure 27 RTS/CTS When station A sends data to the Prestige, it might not know that the station B is already using the channel. If these two stations send data at the same time, collisions may occur when both sets of data arrive at the AP at the same time, resulting in a loss of messages for both stations. RTS/CTS is designed to prevent collisions due to hidden nodes. An RTS/CTS defines the biggest size data frame you can send before an RTS (Request To Send)/CTS (Clear to Send) handshake is invoked. When a data frame exceeds the RTS/CTS value you set (between 0 to 2432 bytes), the station that wants to transmit this frame must first send an RTS (Request To Send) message to the AP for permission to send it. The AP then responds with a CTS (Clear to Send) message to all other stations within its range to notify them to defer their transmission. It also reserves and confirms with the requesting station the time frame for the requested transmission. 61 Chapter 4 Advanced