Cisco ONS 15454 SDH Specifications Page 249

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Glossary
GL-19
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
SES
Severely Errored Seconds.
SF
Super Frame.
SML
Service Management Layer.
SMF
Single Mode Fiber.
SNCP
(Subnetwork Connection Protection Ring). Path-switched SDH rings that employ redundant, fiber-optic transmission facilities
in a pair configuration. One fiber transmits in one direction and the backup fiber transmits in the other. If the primary ring fails,
the backup takes over.
SNMP
(Simple Network Management Protocol). Network management protocol used almost exclusively in TCP/IP networks. SNMP
monitors and controls network devices and manages configurations, statistics collection, performance, and security.
SNTP
(Simple Network Time Protocol). Using an SNTP server ensures that all ONS 15454 network nodes use the same date and time
reference. The server synchronizes alarm timing during power outages or software upgrades.
Soft reset
A soft reset reloads the operating system, application software, etc., and reboots the TCC+ card. It does not initialize the ONS
15454 ASIC hardware.
SONET
(Synchronous Optical Network). High-speed synchronous network specification developed by Telcordia Technologies, Inc. and
designed to run on optical fiber. STS-1 is the basic building block of SONET. Approved as an international standard in 1988.
Source
The endpoint where traffic enters an ONS 15454 network. Endpoints can be a path (STS or STS/VT for optical card endpoints),
port (for electrical circuits, such as DS1, VT, DS3, STS), or card (for circuits on DS1 and Ethernet cards). See also STS and VT.
Span
An optical path between two nodes.
Spanning tree
A loop-free subset of a network topology. See also STA and STP.
SPE
(Synchronous Payload Envelope). A SONET term describing the envelope that carries the user data or payload.
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