Specifications

Glossary

GL-10

Cisco ONS 15454 Troubleshooting and Maintenance Guide

November 2001

RMON

Remote Network Monitoring. Allows network operators to monitor the health of the network with a Network Management

System (NMS). RMON watches several variables, such as Ethernet collisions, and triggers an event when a variable crosses a

threshold in the specified time interval.

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 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.

Spanning tree

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.

SSM

Sync Status Messaging. A SONET protocol that communicates information about the quality of the timing source using the S1

byte of the line overhead.

STA

Spanning-Tree Algorithm. An algorithm used by the spanning tree protocol to create a spanning tree. See also Spanning tree

and STP.

Static route

A route that is manually entered into a routing table. Static routes take precedence over routes chosen by all dynamic routing

protocols.

STP

Spanning Tree Protocol. Bridge protocol that uses the spanning-tree algorithm to enable a learning bridge to dynamically work

around loops in a network topology by creating a spanning tree. See also Spanning tree, STA, and Learning bridge.