Specifications

Glossary
GL-10
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
R
Red band
DWDM wavelengths are broken into two distinct bands: red and blue. The red band is the higher frequency band. The red band
DWDM cards for the ONS 15454 operate on wavelengths between 1547.72nm and 1560.61nm.
Retrieve user
A security level that allows the user to retrieve and view CTC information but not set or modify parameters. See also Superuser,
Maintenance user, and Provisioning user.
Revertive switching
A process that sends electrical interfaces back to the original working card after the card comes back online.
Rising threshold
The number of occurrences (collisions) that must be exceeded to trigger an event.
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.
S
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.
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).
Spanning tree
Loop-free subset of a network topology. See also STA and STP.