Linksys BEFW11S4 Manual De Usuario
What IEEE 802.11 features are supported? The product supports the following
IEEE 802.11 functions:
• CSMA/CA plus Acknowledge protocol
• Multi-Channel Roaming
• Automatic Rate Selection
• RTS/CTS feature
• Fragmentation
• Power Management
• CSMA/CA plus Acknowledge protocol
• Multi-Channel Roaming
• Automatic Rate Selection
• RTS/CTS feature
• Fragmentation
• Power Management
What is BSS ID? A specific Ad-hoc LAN is called a Basic Service Set (BSS).
Computers in a BSS must be configured with the same BSS ID.
What is ISM band? The FCC and their counterparts outside of the U.S. have set
aside bandwidth for unlicensed use in the ISM (Industrial, Scientific and
Medical) band. This presents a truly revolutionary opportunity to place con-
venient high speed wireless capabilities in the hands of users around the
globe.
Medical) band. This presents a truly revolutionary opportunity to place con-
venient high speed wireless capabilities in the hands of users around the
globe.
What is Spread Spectrum? Spread Spectrum technology is a wideband radio
frequency technique developed by the military for use in reliable, secure, mis-
sion-critical communications systems. It is designed to trade off bandwidth
efficiency for reliability, integrity, and security. In other words, more band-
width is consumed than in the case of narrowband transmission, but the trade-
off produces a signal that is, in effect, louder and thus easier to detect, pro-
vided that the receiver knows the parameters of the spread-spectrum signal
being broadcast. If a receiver is not tuned to the right frequency, a spread-
spectrum signal looks like background noise. There are two main alternatives,
Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread
Spectrum (FHSS).
sion-critical communications systems. It is designed to trade off bandwidth
efficiency for reliability, integrity, and security. In other words, more band-
width is consumed than in the case of narrowband transmission, but the trade-
off produces a signal that is, in effect, louder and thus easier to detect, pro-
vided that the receiver knows the parameters of the spread-spectrum signal
being broadcast. If a receiver is not tuned to the right frequency, a spread-
spectrum signal looks like background noise. There are two main alternatives,
Direct Sequence Spread Spectrum (DSSS) and Frequency Hopping Spread
Spectrum (FHSS).
What is DSSS? What is FHSS? And what are their differences? Frequency
Hopping Spread Spectrum (FHSS) uses a narrowband carrier that changes
frequency in a pattern that is known to both transmitter and receiver. Properly
synchronized, the net effect is to maintain a single logical channel. To an
unintended receiver, FHSS appears to be short-duration impulse noise. Direct
Sequence Spread Spectrum (DSSS) generates a redundant bit pattern for each
bit to be transmitted. This bit pattern is called a chip (or chipping code). The
longer the chip, the greater the probability that the original data can be recov-
ered. Even if one or more bits in the chip are damaged during transmission,
statistical techniques embedded in the radio can recover the original data
frequency in a pattern that is known to both transmitter and receiver. Properly
synchronized, the net effect is to maintain a single logical channel. To an
unintended receiver, FHSS appears to be short-duration impulse noise. Direct
Sequence Spread Spectrum (DSSS) generates a redundant bit pattern for each
bit to be transmitted. This bit pattern is called a chip (or chipping code). The
longer the chip, the greater the probability that the original data can be recov-
ered. Even if one or more bits in the chip are damaged during transmission,
statistical techniques embedded in the radio can recover the original data
Instant Wireless
®
Series
Is the Router cross-platform compatible? Any platform that supports Ethernet
and TCP/IP is compatible with the Router.
How many ports can be simultaneously forwarded? Theoretically, the Router can
establish 520 sessions at the same time, but you can only forward 10 ranges
of ports.
of ports.
Does the Router replace a modem? Is there a cable or DSL modem in the Router?
No, this version of the Router must work in conjunction with a cable or DSL
modem.
modem.
Which modems are compatible with the Router? The Router is compatible with
virtually any cable or DSL modem that supports Ethernet.
What are the advanced features of the Router? The Router’s advanced features
include IP Filtering, Port Range Forwarding, Dynamic Routing, Static
Routing, DMZ hosting, and MAC Address Cloning.
Routing, DMZ hosting, and MAC Address Cloning.
What is the maximum number of VPN sessions allowed by the Router?
The maximum number depends on many factors. At least one IPSec session
will work through the Router; however, simultaneous IPSec sessions may be
possible, depending on the specifics of your VPNs.
will work through the Router; however, simultaneous IPSec sessions may be
possible, depending on the specifics of your VPNs.
How big is the memory buffer on the Router? 1MB buffer and 512KB flash.
How can I check whether I have static or DHCP IP Addresses? Consult your ISP
to obtain this information.
How do I get mIRC to work with the Router? Under the Port Range Forwarding
tab, set port forwarding to 113 for the PC on which you are using mIRC.
Can the Router act as my DHCP Server? Yes. The Router has DHCP Server soft-
ware built-in.
Can I run an application from a remote computer over the wireless network? This
will depend on whether or not the application is designed to be used over a
network. Consult the application’s documentation to determine if it supports
operation over a network.
network. Consult the application’s documentation to determine if it supports
operation over a network.
What is the IEEE 802.11b standard? The IEEE 802.11b Wireless LAN standards
subcommittee formulates the standard for the industry. The objective is to
enable wireless LAN hardware from different manufacturers to communicate.
enable wireless LAN hardware from different manufacturers to communicate.
Wireless-B Broadband Router
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