Справочник Пользователя для ZyXEL Communications G-2000 Plus
ZyAIR G-2000 Plus User’s Guide
Chapter 1 Getting to Know Your ZyAIR
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1.2.2.4 802.11g Wireless LAN Standard
The ZyAIR, complies with the 802.11g wireless standard and is also fully compatible with the
802.11b standard. This means an 802.11b radio card can interface directly with an 802.11g
device (and vice versa) at 11 Mbps or lower depending on range. 802.11g has several
intermediate rate steps between the maximum and minimum data rates. The 802.11g data rate
and modulation are as follows:
802.11b standard. This means an 802.11b radio card can interface directly with an 802.11g
device (and vice versa) at 11 Mbps or lower depending on range. 802.11g has several
intermediate rate steps between the maximum and minimum data rates. The 802.11g data rate
and modulation are as follows:
Table 2 IEEE 802.11g
DATA RATE
(MBPS)
(MBPS)
MODULATION
6/9/12/18/24/36/48/54
OFDM (Orthogonal Frequency Division Multiplexing)
.
Note: The ZyAIR may be prone to RF (Radio Frequency)
interference from other 2.4 GHz devices such as microwave
ovens, wireless phones, Bluetooth enabled devices, and other
wireless LANs.
interference from other 2.4 GHz devices such as microwave
ovens, wireless phones, Bluetooth enabled devices, and other
wireless LANs.
1.2.2.5 STP (Spanning Tree Protocol) / RSTP (Rapid STP)
(R)STP detects and breaks network loops and provides backup links between switches,
bridges or routers. It allows a bridge to interact with other (R)STP -compliant bridges in your
network to ensure that only one path exists between any two stations on the network.
bridges or routers. It allows a bridge to interact with other (R)STP -compliant bridges in your
network to ensure that only one path exists between any two stations on the network.
1.2.2.6 Certificates
The ZyAIR can use certificates (also called digital IDs) to authenticate users. Certificates are
based on public-private key pairs. Certificates provide a way to exchange public keys for use
in authentication.
based on public-private key pairs. Certificates provide a way to exchange public keys for use
in authentication.
1.2.2.7 Limit the number of Client Connections
You may set a maximum number of wireless stations that may connect to the ZyAIR. This
may be necessary if for example, there is interference or difficulty with channel assignment
due to a high density of APs within a coverage area.
may be necessary if for example, there is interference or difficulty with channel assignment
due to a high density of APs within a coverage area.
1.2.2.8 SSL Passthrough
SSL (Secure Sockets Layer) uses a public key to encrypt data that's transmitted over an SSL
connection. Both Netscape Navigator and Internet Explorer support SSL, and many Web sites
use the protocol to obtain confidential user information, such as credit card numbers. By
convention, URLs that require an SSL connection start with “https” instead of “http”. The
ZyAIR allows SSL connections to take place through the ZyAIR.
connection. Both Netscape Navigator and Internet Explorer support SSL, and many Web sites
use the protocol to obtain confidential user information, such as credit card numbers. By
convention, URLs that require an SSL connection start with “https” instead of “http”. The
ZyAIR allows SSL connections to take place through the ZyAIR.