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Axxius 800 - Release 2.2 Glossary - 17
Glossary
star network
star network A star is a network topology that connects all devices to a central location
called a hub. Traditional star networks are designed to be easily
expandable because hubs can be connected to additional hubs of other
networks. A star is the opposite of a ring network. Also see BUS
network.
static In communications, interference (static) that destroys the integrity of
signals on a line. Noise can come from a variety of sources, including
radio waves, nearby electrical wires, lightning, and bad connections. One
of the major advantages of fiber optic cables over metal cables is that
they are much less susceptible to noise.
subnet mask 32-bit quantity indicating which bits in an IP address identify the
physical network
subrate
multiplexing
The process of combining lower data rates into a single 64 Kbps channel
signal.
subscriber line The telephone line connecting the local Telco CO to the customer’s
telephone instrument or telephone system.
switch In networks, a device that filters and forwards packets between LAN
segments. Switches operate at the data link layer (layer 2) of the OSI
Reference Model and therefore support any packet protocol. LANs that
use switches to join segments are called switched LANs or, in the case of
Ethernet networks, switched Ethernet LANs. See contact.
synchronous See asynchronous as an opposing technology. Data transmission using
synchronization bytes, instead of start/stop bits, to control the
transmission. In xDSL, video streams are considered to be synchronous
in nature.
T1 Trunk Level 1. A digital transmission link with a total signaling speed of
1.544 Mbps. T1 is a standard for the digital transmission in North
America