Cabletron Systems switches - Manual (Page 128)

SIMM to Switch
Glossary-10
SIMM Single In-line Memory Module. A collection of Random Access Memory
(RAM) microprocessors which are placed on a single, replaceable printed
circuit board. These SIMMs may be added to some devices to expand the
capacity of certain types of memory.
Single Attached Connected to an FDDI network through a single cable which does not
provide for auto-wrap functions.
Single Mode A type of fiber optics in which light travels in one predefined mode, or
wavelength. Signals in single mode fiber optics are typically driven by
lasers. The use of lasers and the transmission characteristics of single
mode fiber optics allow the media to cover greater distances than
multimode
fiber optics.
SMA Sub-Miniature Assembly. A modular connector and port system used in
multimode
fiber optic cabling. The SMA connector is threaded, and is
screwed into an SMA port.
Spanning Tree A mathematical comparison and decision algorithm performed by
Ethernet bridges at power-up. Spanning tree detects the presence of data
loops and allows the bridges to selectively activate some ports while
others remain in a standby condition, avoiding the data loops and
providing redundant paths in the event of bridge failures.
SQE Signal Quality Error. A self-monitoring test performed by some Ethernet
equipment which examines the status of the device at arbitrary and
predefined intervals.
ST Straight-Tip. A modular connector and port system used with both
multimode
and single mode fiber optic cabling. The ST connector utilizes
an insert and twist-lock mechanism.
Station See node.
STP Shielded Twisted Pair. Refers to a type of cabling, most commonly used in
Token Ring networks, which consists of several strands of cables
surrounded by foil shielding, which are twisted together. See also UTP.
Straight-Through A length of multi-stranded cable in which the transmit wire(s) of one end
is/are passed directly through the cable to the same location on the other
end. Straight-through cables are used for most facility cabling. See also
crossover
.
Switch A network device which connects two or more separate network
segments and allows traffic to be passed between them when necessary. A
switch determines if a packet should be blocked or transmitted based on
the destination address contained in that packet.