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ANA-5910/5930/5940 User’s Guide
Glossary-10
until manually torn down. See
SVC.
Q
QoS
Quality of Service. A set of
communication characteristics
required by an application. Each
QoS defines a specific
transmission priority, level of
route reliability and security
level.
R
RFC
Request For Comment. The
document series, begun in 1969,
which describes the Internet
suite of protocols and related
experiments. Not all RFCs
describe Internet standards, but
all Internet standards are written
up as RFCs.
Router
An attaching device that
connects LAN segments to other
LANs or WANs. Routers operate
at the network OSI Layer 3 and
transmit data that needs to cross
network boundaries. Contrast
with bridge. See Gateway.
S
SAR
Segmentation And Reassembly.
The function in the ATM
Protocol Reference Model that
converts the data received from
the AAL into ATM cells (one
way) or converts ATM cells into
data that can be processed by the
AAL (the other way). This
function is performed by the
SAR chip on the network
interface card.
SCR
Sustained Cell Rate. A type of
ATM traffic flow. An average of
rates at which cells are
transmitted over a certain
(short) period of time.
SDH
Synchronous Digital Hierarchy.
International standard for
optical digital transmission at
hierarchical rates from 155
Mbits/sec to 2.5 Gbits/sec and
beyond.
Server
A computer on a network that
services other nodes. Also called
a back end or engine.
Setup Program
A CMOS-resident configuration
utility built into most computers
that is used to configure the
computer’s motherboard and
option boards. You typically run
the setup program after you
install new peripherals,
upgrade the computer memory,
etc. Configuration information is
stored in an EEPROM which
retains the data when the
computer power is turned OFF.
Signaling
In ATM terms, the process
followed to set up switched
virtual connections and establish