Glossary
GL-24
Cisco 6260 Hardware Installation Guide
OL-2365-02
router
A system responsible for making decisions about which of several paths network (or Internet) traffic
will follow. The router uses a routing protocol to gain information about the network and algorithms
to choose the best route based on several criteria known as “routing metrics.” See also
bridge
and
switch.
routing table
A table that is stored in a router or some other internetworking device that keeps tracks of routes to
particular network destinations, and, in some cases, metrics associated with those routes. A routing
table is used to select the most appropriate route to forward information.
S
scalability
Capacity of a network to keep pace with changes and growth.
SDSL
symmetrical digital subscriber line. An
x
DSL technology that can delivers 1.168 Mbps downstream
and upstream over a single copper twisted pair. The use of a single twisted pair limits the operating
range of SDSL to 10,000 feet (3048.8 meters). Compare with
ADSL
,
IDSL
, and
SHDSL
. See also
DSL
.
security
management
One of five categories of network management defined by ISO for the management of ISO networks.
Security management subsystems are responsible for controlling access to network resources. See
also
accounting management
,
configuration
management
,
fault
management
, and
performance management
.
Serial Line Internet
Protocol
See
SLIP
.
server
Node or software program that provides services to clients.
SHDSL
single-pair high-speed digital subscriber line, also known as symmetric high bit rate digital subscriber
loop. A version of
x
DSL that includes advanced Trellis line code, a precoding mechanism, spectral
shaping, equalization circuits, and forward error correction. SHDSL can deliver 2.312 Mbps of
bandwidth downstream and upstream over a single copper twisted pair. Compare with
ADSL
,
IDSL
,
and
SDSL
. See also
DSL
.
shielded twisted
pair
A pair of insulated wires which are twisted together in a spiral manner. In addition, the pair is wrapped
with metallic foil or braid, designed to insulate the pair from electromagnetic interference. Sometimes
referred to as STP. See also
twisted
pair
and
unshielded twisted pair
.
SHTU-C
See
xTU-C
.
SHTU-R
See
xTU-R
.
signal-to-noise ratio
See
SNR
.
Simple Network
Management
Protocol
See
SNMP
.
single-mode fiber
See
SMF
.
single-pair
high-speed digital
subscriber line
See
SHDSL
.