GLOSSARY of Printed Circuits

       O

Index to terms on this page:

OASIS   OBE   ODB++   ODBC  
odd-mode impedance   OE   OEM   OLED   open   OR  
ordinate dimension   OSI model   OSP   OTTP   ounce  

OASIS — The Organization for the Advancement of Structured Information Standards (OASIS) is a global nonprofit consortium that works on the development, convergence, and adoption of open standards for security, Internet of Things, energy, content technologies, emergency management, and other areas.

https://www.oasis-open.org/
Under its committee category IoT/M2M, there is a technical commmittee for OASIS Advanced Message Queuing Protocol (AMQP).

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OBE —

1. Overtaken By Events
2. Our Best Estimate
3. Our Best Effort
4. Out-Board Electronics
5. Overwhelmed by Events

ODB++ — ODB stands for Open Data Base.

ODB++ is a PCB fabrication data exchange format in ASCII that goes beyond Gerber and NC DRill data to describe the fully assembled PCB, with all constituent parts. Developed by Valor, it branched into IPC-2581 (later given the acronym DPMX, which means Digital Product Model eXchange) in 2011.
Wikipedia ODB++

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ODBC — Open DataBase Connectivity. (Refers to industry-standard framework.)

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odd-mode impedance — One-half the differential impedance.

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OE — Output Enable

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OEM — Original Equipment Manufacturer

1. (Dictionary.com)A company that puts together computer systems using pieces of equipment bought from other companies, and sells them under its own name.
2. (netlingo.com) A company that has a special relationship with computer producers: OEMs buy computers in bulk and customize them for a particular application; then they sell the customized computer under their own name. The term is really a misnomer because OEMs are not the original manufacturers; they are customizers of other people's products.

OLED — Organic Light Emitting Diode

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open — (OH-pən)   Pronunciation Key  noun  [Electrical Circuits] Open circuit. An unwanted break in the continuity of an electrical circuit which prevents current from flowing.

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OR — OR gate. A two-input Boolean circuit that has a value of 1 (or true) if either of its inputs is 1 (that is to say, high voltage).

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ordinate dimension — Altium Designer 18.0 and later. Same as term used in earlier Altium Designer releases: datum dimension, q.v.

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OSI model — The Open Systems Interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system without regard to its underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers.

A layer serves the layer above it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the path needed by applications above it, while it calls the next lower layer to send and receive packets that comprise the contents of that path. Two instances at the same layer are visualized as connected by a horizontal connection in that layer. The model is a product of the Open Systems Interconnection project at the International Organization for Standardization (ISO). Wikipedia OSI model

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OSP — Organic Solder Preservative (Protective). A coating used on exposed copper on a PCB to preserve the copper from oxidation until it can be soldered. This is an alternative to metallic finishes such as solder coating, gold or silver plating. OSP has a short shelf-life (6-months, avoid physical contact) compared with some metallic finishes, so a PCB so finished should be assembled as soon as possible. Note: Immersion Silver and Immersion Tin also have 6-months shelf life, avoid physical contact. [IPC D_7251WD1 Table 3-27]

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OTTP — Open Trade Transfer Package format. A structure that allows files to be generated to facilitate the exchange of data concerning trade. It can be utilized to exchange information on product specifications, requirements, defaults and restrictions as well as capabilities. It can also be used to exchange a material list or other needed related data.
Open-Trade-Transfer-Package

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ounce — (OWNS)  Pronunciation Key  modifier  [PCB Manufacturing] A unit used to specify thickness in terms of copper weight on a PCB, as in "1-ounce copper" or "Half-ounce copper."
   This is actually PCB manufacturing slang. Ounce is a shortening of "ounces per square inch." Because copper has a characteristic density, this is a thickness unit, not a weight unit. I hope that clears up something for those new to our industry. For actual thickness of "1-ounce copper", see copper weight.

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