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Appendix F: Specifications
Model Number BEFSR41W
Standards PC Card 16-bit standard, IEEE 802.3 (10BaseT),
IEEE 802.3u (100BaseTX), IEEE 802.11b
(Wireless)*
Protocol CSMA/CD
Ports
WAN: One 10Base-T RJ-45 Port for Cable/DSL Modem
LAN: Four 10/100 RJ-45 Switched Ports,
One Shared Uplink Port
Speed
WAN 10Mbps
LAN 10/100Mbps (Half Duplex) 20/200Mbps (Full
Duplex)
Wireless* Up to 11 Mbps
Cabling Type UTP Category 5 or better
Operating Range* Indoors: Up to 300 ft. (91m)
(Wireless) Outdoors: Up to 1500 ft. (457m)
LEDs Power, Diag
WA N WA N
LAN 100, Full/Col, Link/Act, WLAN
EtherFast
®
Cable/DSL Wireless-Ready Router with 4-Port Switch
63
UDP (User Datagram Protocol) - A communications method (protocol) that
offers a limited amount of service when messages are exchanged between com-
puters in a network that uses the Internet Protocol (IP). UDP is an alternative
to the Transmission Control Protocol (TCP) and, together with IP, is sometimes
referred to as UDP/IP. Like the Transmission Control Protocol, UDP uses the
Internet Protocol to actually get a data unit (called a datagram) from one com-
puter to another. Unlike TCP, however, UDP does not provide the service of
dividing a message into packets (datagrams) and reassembling it at the other
end. Specifically, UDP doesn't provide sequencing of the packets that the data
arrives in. This means that the application program that uses UDP must be able
to make sure that the entire message has arrived and is in the right order.
Network applications that want to save processing time because they have very
small data units to exchange (and therefore very little message reassembling to
do) may prefer UDP to TCP.
UTP - Unshielded twisted pair is the most common kind of copper telephone
wiring. Twisted pair is the ordinary copper wire that connects home and many
business computers to the telephone company. To reduce crosstalk or electro-
magnetic induction between pairs of wires, two insulated copper wires are
twisted around each other. Each signal on twisted pair requires both wires.
Since some telephone sets or desktop locations require multiple connections,
twisted pair is sometimes installed in two or more pairs, all within a single
cable.
Virtual Server - Multiple servers that appear as one server, or one system
image, to the operating system or for network administration
WAN - A communications network that covers a wide geographic area, such as
a state or country.
WEP (Wired Equivalent Privacy) - A data privacy mechanism based on a 64-
bit shared key algorithm, as described in the IEEE 802.11 standard.
WINIPCFG - Configuration utility based on the Win32 API for querying,
defining, and managing IP addresses within a network. A commonly used util-
ity, under Windows 95, 98, and Millennium, for configuring networks with
static IP addresses.
Instant Broadband
TM
Series
62