Segmentation and Reassembly. The process by which large packets are broken into pieces for transmission over media that can't support large packets. The packets are segmented at the source and reassembled at the destination.
SAS
Single Attached Station (an FDDI term)
SAS
Software Application Support (Cisco)
SaSS
Safety and Site Services
SAU
Software Application support plus Upgrades (Cisco; SAS+Upgrades)
SB
Salary and Benefits
SC
Square Connector, a type of fiber connector. Differs from ST (straight tip) connectors.
SCB
System Control Board
SCCP
Signaling Connection Control Part
SCD
Scientific Computing Division, a UCAR division that was renamed CISL.
SCDUG
SCD Users Group
SCID
SCD Computer Inventory Database. A Macintosh-based database used by Stan Mclaughlin to track inventory. Contains inventory information for all machines in the Mesa and Foothills lab computer rooms and SCD offices.
-Sponsored Educational Group Participant (Internet2)
SEP
Scalable Encryption Processor
server
A computer that shares its resources, such as printers and files, with other computers on the network. An example of this is a Network File System server which shares its disk space with a workstation that does not have a disk drive of its own.
SET
Secure Electronic Transactions
SEU
Singe Event Upset
severities
The term NETS uses to refer to the 3 levels of problems that the UCAR NOC might handle. See NETS severity levels
SFM
Switching and Forwarding Module (Juniper)
SFM
Small form-factor pluggable (SFP) is a specification for a new generation of optical modular transceivers. The devices are designed for use with small form factor (SFF) connectors, and offer high speed and physical compactness. They are hot-swappable.
SFP
Small Form Factor Pluggable, a type of fiber terminator that allows dense packing of fiber interfaces on a board
Serial Line IP. An Internet protocol used to run IP over serial lines such as telephone circuits or RS-232 cables interconnecting two systems. SLIP is gradually being replaced by PPP, which is more capable.
Server Message Block, a Microsoft protocol for sharing files, printers, serial ports, and communications abstractions such as named pipes and mail slots between computers. All Windows systems are capable of being SMB servers or clients. See Richard Sharpe's "Just What Is SMB" page
SMART
Self-Monitoring Analysis and Reporting Technology. Most hard drives currently come equipped with SMART systems, which enable the drive to monitor itself to help determine problems and provide early warnings to failures. You use software to query the SMART system on the drive. On Linux systems, the SMART software is smartctl. Use "smartctl -l" for options.
Switched Multimegabit Data Service. An high-speed networking technology offered by the telephone companies in the U.S.
SMF
Single-Mode Fiber; Software MAC Filter
SMI
Structure of Management Information. The rules used to define the objects that can be accessed via a network management protocol. See MIB.
SMS
Service Management Solution (CiscoWorks2000 bundle)
SMT
Station Management. Part of the FDDI protocol that manages stations on an FDDI ring. SMT detects when stations enter and/or leave the ring, causing other stations to wrap the ring.
SMTP
Simple Mail Transfer Protocol. The Internet electronic mail protocol. Defined in RFC 821, with associated message format descriptions in RFC 822.
SNA
Systems Network Architecture. IBM's proprietary network architecture.
SNAP
Simple Network Automated Provisioning (Cisco)
SNG
Secure Network Gateway
sniffer
A device used to monitor the traffic on a network, usually to locate problems.
SNK
SecureNet Key
SNMP
Simple Network Management Protocol. The network management protocol of choice for TCP/IP-based internets.
SNR
Signal to Noise Ratio
SOARS
Significant Opportunities in Atmospheric and Related Sciences
SONET
Synchronous Optical NETwork
SOTN
State Of The Network (NETS)
SPAN
Space Physics Analysis Network, a DECnet network maintained by NASA.
SPAN
Switched Port Analyzer (Cisco)
SPANS
Simple Protocol for ATM Network Signalling. A protocol developed by Fore Systems as a pre-standard mechanism for establishing SVCs.
SPARC
Space Physics and Aeronomy Research Collaboratory
SPE
Service Processing Element
SPI
Security Parameter Index
SPIN
Software Process Improvement Network (ColoSPIN-Colorado SPIN)
Springs International
A language school on the Auraria campus, and a member of the UPop.
SPSL
Security Policy Specification Language
SPT
Shortest Path Tree, a multicast term.
SQE
Signal Quality Error, sometimes referred to as heartbeat. A signal from an Ethernet transceiver to the attached device indicating that a collision has occurred. Most transceivers have a switch allowing SQE generation to be enabled or disabled. 802.3 repeaters require SQE to be disabled. Suns shouldn't care but seem to like it off.
SQL
Structured Query Language. The standard language for defining and accessing relational databases. SQL is used at NCAR to access ORACLE relational databases.
The central connecting device for DEC's VAXcluster technology.
STARS
Structure Function Analysis of Received Signals)
STARTAP
Science, Technology And Research Transit Access Point
STM-16
2488.320Mbits/sec
STM-1
155.520Mbits/sec
STM-4
622.080Mbits/sec
STM
Synchronous Transport Module
STP
Spanning Tree Protocol
STRG
Spanning Tree Root Guard
STS
Synchronous Transport Signal
STUN
Serial TUNnelling
subnet mask
See address mask.
SVC
Switched Virtual Circuit. A term used in ATM networks. SVCs are the volatile cousin of PVCs.
SVC
Switched Virtual Circuit
SVG
Scalable Vector Graphics
SW-MISM
Software mismatch, a.k.a. Incorrect software load. One of several alarm types
that may be displayed by a "show alarm" command in an ADVA RayExpress device. "SW-MISM"
can arise if the versions of software in the active and standby SP cards are not the same.
SWAP
Shared Wireless Access Protocol
swatch
A program that "watches" syslog files and takes actions (like sending email)
when messages are logged that match certian predifined patterns.
See How NETS uses swatch.
SWIP
Shared WhoIs Project
Synoptics
A company that used to make hubs. Synoptics merged into Bay Networks.
Syslog
A scheme for logging messages from several machines onto one Unix machine.
A daemon on the Unix machine accepts messages and writes them to a log file.
NETS uses syslog to record messages sent by networking devices.
See How NETS uses syslog.
