Adaptec ANA-5940 User Manual
Page 146
ANA-5910/5930/5940 User’s Guide
Stock Number: 510694-00, Rev. C
Page: Glossary-10
Print Spec Number: 493081-00
Current Date: 5/28/97
ECN Date: 05/29/97
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