OAKLEY Key Determination Protocol
The OAKLEY Key Determination Protocol is based on the Diffie-Hellman algorithm and designed to be a compatible component of ISAKMP. OAKLEY was proposed as a protocol "by which two authenticated parties can agree on secure and secret keying material.
Standard Organization: IETF
Reference Document: RFC 2412

OC: Optical Carrier
Optical Carrier (OC) is a group of signal bandwidth in a SONET fiber optic network with many defined levels. It is typically denoted as OC-n, where n is the multiplexing factor of the basic rate of 51.8 Mbit/s. The currently defined levels are:
OC-1 — 51.8 Mbit/s
OC-3 — 155.52 Mbit/s
OC-12 — 622.08 Mbit/s
OC-24 — 1.244 Gbit/s
OC-48 — 2.488 Gbit/s
OC-96 — 4.976 Gbit/s
OC-192 — 9.953 Gbit/s
OC-256 — about 13 Gbit/s
OC-384 — about 20 Gbit/s
OC-768 — about 40 Gbit/s
OC-1536 — about 80 Gbit/s
OC-3072 — about 160 Gbit/s
Standard Organization: ANSI/ITU-T

OC1: Optical Carrier One
Optical Carrier One (OC-1) is a SONET line with transmission speed of 51.84 Mbit/s (payload: 50.112 Mbit/s; overhead: 1.728 Mbit/s) using optical fiber. OC-1 is the basic rate for the SONET optical fiber lines and the other rate levels of SONET are multipled based on the OC-1 speed. OC-1 is equivalent to STS-1 (Electrical level) and STM-0 (SDH).
Standard Organization: ANSI/ITU-T

OC12: Optical Carrier 12
Optical Carrier 12 (OC-12) is a fiber optic network line with a SONET rate of 622.08 Mbit/s (payload: 601.344 Mbit/s; overhead: 20.736 Mbit/s) or 12 times the basic SONET signal transmitting rate of 51.84 Mbit/s (OC-1). OC-12 lines are commonly used by Service Providers as WAN connections. This connection speed is often used by mid-sized (below Tier 2) internet customers, such as web hosting companies or smaller ISPs buying service from larger ones. OC-12 is equivalent to STS-12 (Electrical level) and STM-4 (SDH).
Standard Organization: ANSI/ITU-T

OC192: Optical Carrier 192
Optical Carrier 192 (OC-192) is a SONET rate of 9953.28 Mbit/s (payload: 9621.504 Mbit/s; overhead: 331.776 Mbit/s) over optic fiber lines, or 192 times the basic 51.84 Mbit/s SONET signal (OC-1). The WAN version of 10 Gigabit Ethernet is designed to interoperate with OC-192. As of 2006, OC-192 connections are the most common for use on the backbones of large ISPs. OC-192 is equivalent to STS-192 (Electrical level) and STM-64 (SDH).
Standard Organization: ANSI/ITU-T

OC3: Optical Carrier 3
Optical Carrier 3 (OC-3) is a optic fiber line using SONET with transmission speed of 155.52 Mbit/s (payload: 150.336 Mbit/s; overhead: 5.184 Mbit/s), or 3 times the basic 51.84 Mbit/s SONET signal (OC-1). OC-3 is equivalent to STS-3 (Electrical level)and STM-1 (SDH).
Standard Organization: ANSI/ITU-T

OC48: Optical Carrier 48
Optical Carrier 48 (OC-48) is a fiber optic line with a SONET rate of 2488.32 Mbit/s (payload: 2405.376 Mbit/s; overhead: 82.944 Mbit/s) or 48 times the basic SONET signal transmitting at 51.84 Mbit/s. OC-48 connections are used as the backbones of many regional ISPs. OC-1 is equivalent to STS-48 (Electrical level) and STM-16 (SDH).
Standard Organization: ANSI/ITU-T

OC768: Optical Carrier 768
Optical Carrier 768 (OC-768) is a fiber optic line with a SONET rate of 39,813.12 Mbit/s (payload: 38,486.016 Mbit/s; overhead: 1327.104 Mbit/s), or 768 times the basic SONET rate of 51.84 Mbit/s (OC-1). It's often referred to as "40 Gbit". OC-768 is equivalent to STS-768 (Electrical level) and STM-256 (SDH).
Standard Organization: ANSI/ITU-T

OC96: Optical Carrier 96
Optical Carrier 96 (OC-96) is a fiber optic line with a SONET rate of 4976 Mbit/s, or 96 times the basic SONET rate of 51.84 Mbit/s (OC-1). It's not used much in the real world.
Standard Organization: ANSI/ITU-T

OC-n: Optical Carrier level n
Optical Carrier level n (OC-n) is a group of signal bandwidth in a SONET fiber optic network with many defined levels. It is typically denoted as OC-n, where n is the multiplexing factor of the basic rate of 51.8 Mbit/s. The currently defined levels are:
OC-1 — 51.8 Mbit/s
OC-3 — 155.52 Mbit/s
OC-12 — 622.08 Mbit/s
OC-24 — 1.244 Gbit/s
OC-48 — 2.488 Gbit/s
OC-96 — 4.976 Gbit/s
OC-192 — 9.953 Gbit/s
OC-256 — about 13 Gbit/s
OC-384 — about 20 Gbit/s
OC-768 — about 40 Gbit/s
OC-1536 — about 80 Gbit/s
OC-3072 — about 160 Gbit/s
Standard Organization: ANSI/ITU-T

Open Group
The Open Group is an industry consortium to set vendor- and technology-neutral open standards for computing infrastructure. It was formed when X/Open merged with the Open Software Foundation in 1996. The Open Group is known for its experience in facilitating consensus to develop and evolve standards and best practices. They operate a number of certification programs, including certification for Common Operating Environment (COE) Platform, CORBA, Directory, IT Architects, Linux Standard Base, POSIX, Schools Interoperability Framework (SIF), TOGAF, UNIX, and Wireless Application Protocol (WAP). The Open Group is also the owner of the UNIX trademark.

OpenSS7
OpenSS7, also known as LinuxSS7, is an opensource development project to provide robust and GPL'ed SS7 stack for Linux and other UN*X operation systems. The website of this organization is: http://www.openss7.org .
Standard Organization: Open Group

OpenSSL
The OpenSSL is a collaborative project to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. The project is managed by a worldwide community of volunteers that use the Internet to communicate, plan, and develop the OpenSSL toolkit and its related documentation. The OpenSSL toolkit is licensed under an Apache-style licence, which means that you are free to get and subject to some simple license conditions.
Standard Organization: OpenSSL

OSI Model: OSI Network Architecture 7 Layers Model
OSI Network Architecture 7 Layers Model (OSI Model or OSI 7 Layers Model) is a reference model developed by ISO (International Organization for Standardization) in 1984, as a conceptual framework of standards for communication in the network across different equipment and applications by different vendors. It is now considered the primary architectural model for inter-computing and inter-networking communications. Most of the network communication protocols used today have a structure based on the OSI model.
Standard Organization: ISO

OSI NLCP: OSI Network Layer Control Protocol
OSI Network Layer Control Protocol (OSI NLCP), a protocol in the Point-to-Point Protocol (PPP) suite, is responsible for configuring, enabling and disabling the OSI protocol modules on both ends of the PPP link.
Standard Organization: IETF
Reference Document: RFC 1337

OSI 7-Layer Reference Model
Open Systems Interconnection (OSI) 7-Layer Reference Model, also known as OSI model or 7 layers model or OSI reference model, is a reference model developed by ISO (International Organization for Standardization) in 1984, as a conceptual framework of standards for communication in the network across different equipment and applications by different vendors. It is now considered the primary architectural model for inter-computing and inter-networking communications. Most of the network communication protocols used today have a structure based on the OSI model. The OSI model defines the communications process into 7 layers, dividing the tasks involved with moving information between networked computers into seven smaller, more manageable task groups. A task or group of tasks is then assigned to each of the 7 OSI layers. Each layer is reasonably self-contained, so that the tasks assigned to each layer can be implemented independently. This enables the solutions offered by one layer to be updated without adversely affecting the other layers.

OSP: Open Settlement Protocol
Open Settlement Protocol(OSP) is a client/server protocol defined by the ETSI TIPHON to establish authenticated connections between gateways, and to allow gateways and servers to transfer accounting and routing information securely. OSP allows service providers to roll out VoIP services without establishing direct peering agreements with other ITSPs.
Standard Organization: ETSI

OSPF: Open Shortest Path First
Open Shortest Path First (OSPF) is an interior gateway protocol which is used for routing between routers belonging to a single Autonomous System. OSPF uses link-state technology in which routers send each other information about the direct connections and links which they have to other routers. Each OSPF router maintains an identical database describing the Autonomous System's topology. From this database, a routing table is calculated by constructing a shortest path tree. OSPF recalculates routes quickly in the face of topological changes, utilizing a minimum of routing protocol traffic. OSPF has two primary versions OSPFv2, which is designed for IPv4 and OSPFv3 for IPv6.
Standard Organization: IETF
Reference Document: RFC 2328

OSPFv3: Open Shortest Path First version 3
Open Shortest Path First version 3 (OSPFv3), also known as OSPF for IPv6, is an interior gateway protocol for routing between routers belonging to a single Autonomous System in IPv6 networks. OSPFv3, based on the widely deployed OSPFv2, has maintained many fundamental mechanisms of OSPFv2. Changes between OSPFv2 for IPv4 and OSPFv3 include the following: 1) Addressing semantics have been removed from OSPF packets and the basic LSAs. 2) New LSAs have been created to carry IPv6 addresses and prefixes. 3) OSPF now runs on a per-link basis, instead of on a per-IP-subnet basis. 4) Flooding scope for LSAs has been generalized. 5) Authentication has been removed from the OSPF protocol itself, instead relying on IPv6's Authentication Header and Encapsulating Security Payload.