EMC Connectrix B Series Hardware Reference Manual page 132

Glossary
SMDS Switched Multimegabit Data Service. A good protocol for
interconnecting LANs; however, SMDS has less error-checking
capability than Frame Relay.
SMF Single-mode fiber. See also LWL.
SMI Structure of management information. A notation for setting or
retrieving SNMP management variables.
SNA/SDLC Systems Network Architecture/Synchronous Data Link Control. A
structure for transferring data among a variety of computing
platforms.
SNMP Simple Network Management Protocol. An Internet management
protocol that uses either IP for network-level functions and UDP for
transport-level functions, or TCP/IP for both. Can be made available
over other protocols, such as UDP/IP, because it does not rely on the
underlying communication protocols. See also Community (SNMP).
SNS Simple Name Server. A switch service that stores names, addresses,
and attributes for up to 15 minutes, and provides them as required to
other devices in the fabric. SNS is defined by Fibre Channel standards
and exists at a well-known address. May also be referred to as
directory service. See also FS.
SOF Start of frame. A group of ordered sets that marks the beginning of a
frame and indicates the class of service the frame will use.
Soft Zone A zone consisting of zone members that are made visible to each
other through client service requests. Typically, soft zones contain
zone members that are visible to devices using Name Server exposure
of zone members. The fabric does not enforce a soft zone. Note that
well-known addresses are implicitly included in every zone.
SoIP SCSI over IP.
SONET Synchronous optical network. A standard for optical networks that
provides building blocks and flexible payload mappings.
Special Character A 10-bit character that does not have a corresponding 8-bit value but
is still considered valid. The special character is used to indicate that
a particular transmission word is an ordered set. This is the only type
of character to have five 1s or 0s in a row.
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Connectrix B Series XPath OS AP-7420B Hardware Reference Manual