569
Glossary
ROM
See
read-only memory
. Contrast with
random access memory
.
router
An attaching device that connects two local area network (LAN) seg-
ments, which use similar or different architectures, at the reference
model network layer (D). Contrast with
bridge
.
RS-232
The Electronic Industry Association (EIA)-recommended specifica-
tion for asynchronous serial interfaces between computers and com-
munications equipment. It specifies both the number of pins and type
of connection, but does not specify the electrical signals (D).
S
S/390 mode
The mode that is most useful when attaching to IBM S/390 Enterprise
Servers. See also
open systems mode
;
operating mode
.
SA/MVS™
See
System Automation for Operating System/390
.
SAN
See
storage area network
;
system area network
.
SANavigator
SANavigator management software provides easy, centralized man-
agement of a SAN and quick access to all device configuration appli-
cations.
SANavigator Server
The computer that is hosting the SANavigator application. Multiple
client systems can log in to the Server to utilize the application. See
also
EFC Server
.
SA OS/390™
See
System Automation for Operating System/390
.
scalable
Refers to how well a system can adapt to increased demands. For
example, a scalable network system could start with just a few nodes
but easily expands to thousands of nodes. Scalability is important
because it allows the user to invest in a system with confidence that a
business will not outgrow it. Refers to anything whose size can be
changed.
SCSI
See
small computer system interface
.
segment
A fabric segments when one or more switches cannot join the fabric
because of various reasons. The switch or switches remain as separate
fabrics.
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