Section 5
Glossary
5-4
WE800G
DSSS
Direct-Sequence Spread Spectrum. DSSS is a transmission
technology used in WLAN transmissions where a data signal at
the sending station is combined with a higher data rate bit
sequence, or chipping code, that divides the user data according
to a spreading ratio. The chipping code is a redundant bit pattern
for each bit that is transmitted, which increases the signal's
resistance to interference. If one or more bits in the pattern are
damaged during transmission, the original data can be recovered
due to the redundancy of the transmission.
Dynamic IP Address
An IP address that is temporarily leased to a host by a DHCP
server. The opposite of
Static IP Address
.
E
ESS
An Extended Service Set (ESS) is a set of two or more BSSs that
form a single subnetwork. See also
BSS
.
Ethernet
The most widely used LAN type, also known as IEEE 802.3. The
most common Ethernet networks are 10Base-T, which provide
transmission speeds up to 10 Mbps, usually over unshielded,
twisted-pair wire terminated with RJ-45 connectors. Fast Ethernet
(100Base-T) provides speeds up to 100 Mbps. “Base” means
“baseband technology” and “T” means “twisted pair cable.”’
Each Ethernet port has a physical address called the MAC
address. Also see
MAC address
.
Event
A message generated by a device to inform an operator or the
network management system that something has occurred.
F
Firewall
A security software system on a router that enforces an access
control policy between the Internet and the LAN for protection.
Firmware
Code written onto read-only memory (ROM) or programmable
read-only memory (PROM). Once firmware has been written onto
the ROM or PROM, it is retained even when the device is turned
off. Firmware is upgradeable.
