Glossary Section "O" ( Definitions )
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OAM Operation, Administration, and Maintenance
OC-1,OC-3,OC-12 OC-n Optical
Carrier (n)- Fundamental unit in the SONET hierarchy. OC indicates an optical signal and n
represents increments of 51.84 Mbit/s. Thus, OC-1, -3, and -12 equal optical signals of
51, 155, and 622 Mbit/s.
OCLC Online Computer Library
Catalog. A nonprofit membership organization offering computer-based services to
libraries, educational organizations, and their users. The OCLC library information
network connects more than 10,000 libraries worldwide. Libraries use the OCLC System for
cataloging, interlibrary loan, collection development, bibliographic verification, and
octet An octet is eight (8)
bits. In networking the term "octet" is often used (rather than
"byte") since some machine architectures employ bytes which are not 8 bits long.
Open Group The Open Group was
formed in February, 1996 by the consolidation of the two leading open systems consortia,
X/Open Company Ltd (X/Open) and the Open Software Foundation (OSF). Under the Open Group
umbrella, OSF and X/Open work together to deliver technology innovations and wide-scale
adoption of open systems specifications.
OpEx Operating Expenditures
Optical-Wireless is a point-to-point technology that transmits laser beams over the air to provide a very high-speed communications link.
Optical-Wireless requires line-of-sight between two transceivers to transmit voice, video, and data on beams of light at speeds up to 2.5 Gbps. Another name for
Optical-Wireless is Free Space Optics or FSO.
OSF Open Software Foundation
OSI Open Systems
Interconnection. An international standardization program to facilitate communications
among computers from different manufacturers.
OSI Network Address The
address, consisting of up to 20 octets, used to locate an OSI Transport entity. The
address is formatted into an Initial Domain Part which is standardized for each of several
addressing domains, and a Domain Specific Part which is the responsibility of the
addressing authority for that domain.
OSPF Open Shortest Path first.
A link state, as opposed to distance vector, routing protocol. It is an Internet standard
IGP defined in RFCs 1583 and 1793. The multicast version, MOSPF, is defined in RFC 1584.
OSI Presentation Address The
address used to locate an OSI Application entity. It consists of an OSI Network Address
and up to three selectors, one each for use by the Transport, Session, and Presentation
OTDR Optical Time Domain Reflectometer is an instrument that analyzes the light loss in an optical fiber network. This trouble shooting OTDR injects a short, intense laser pulse into the optical fiber and measures the reflection of light.
OTN Optical Transport Networks
OTV Overlay Transport Virtualization is used to extend a layer 2 Ethernet network over a WAN
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