EMM-E6 Ethernet User's Guide

Segment to SQE
GL - 12 EMM-E6 User’s Guide
Segment A portion of a network which is separated from other
networks. A segment may be one portion of a bridged,
switched, or routed network. Segments must be capable of
operating as their own networks, without requiring the
services of other portions of the network.
Server A workstation or host device that performs services for
other devices (clients) on the network.
SIMM Single In-line Memory Module. A collection of Random
Access Memory 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 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.
SNMP Simple Network Management Protocol. SNMP is a
standardized set of network monitoring tools. See also
RMON.
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’s connection to the network at arbitrary and
predefined intervals.
CH1Book Page 12 Wednesday, March 20, 1996 7:48 AM