Mobility Glossary in C#

Scanning ANSI/AIM Code 128 in C# Mobility Glossary

propagation delay Time required for data to travel over a network, from its source to its ultimate destination protocol Formal description of a set of rules and conventions that governs how devices on a network exchange information protocol stack Set of related communications protocols that operate together and, as a group, address communication at some or all of the seven layers of the OSI reference model Not every protocol stack covers each layer of the model, and often a single protocol in the stack will address a number of layers at once TCP/IP is a typical protocol stack PSTN Acronym for Public Switched Telephone Network, a general term referring to the variety of telephone networks and services in place worldwide PTM Acronym for point-to-multipoint Common variants include pt-mpt and P2MP However, all versions denote the same concept, which is a communication between a group of sites that interfaces a single hub site PTM is commonly set up in three or four segments to enable frequency reuse, but it can be designed for as many as a dozen or more segments within a single cell PTP Acronym for point-to-point; a common variant is pt-pt However, both versions denote the same concept, which is to provide communication between two endpoints In the United States, PTP systems are typically found in the ISM, U-NII, and LMDS bands PTT Acronym for Post, Telephone, and Telegraph, generally used outside the US government agency that provides telephone services PTTs exist in most areas outside North America and provide both local and long-distance telephone services QAM Acronym for Quadrature Amplitude Modulation, a method of modulating digital signals onto a radio-frequency carrier signal involving both amplitude and phase coding Numbers indicate the number of code points per symbol The QAM rate or the number of points in the QAM constellation can be computed by 2 raised to the power of the number of bits/symbol QoS Acronym for Quality of Service, a feature of certain networking protocols that treats different types of network traffic differently to ensure required levels of reliability and latency according to the type of traffic Certain kinds of traffic, such as voice and video, are more sensitive to transmission delays and are therefore given priority over data that is less sensitive to delay As an example, some systems traditionally have four levels of QoS, but some systems have as many as thirteen levels of QoS, depending on how many bits are used to prioritize the traffic Most systems use either three or four levels of QoS, which are commonly referred to as Unsolicited Grant Service (USG), Committed Bit Rate (CBR; sometimes referred to as CIR or Committed Information Rate), and Best Effort Rate (BER) USG has priority over CIR/CBR, which has priority over BER QoS levels are set in Layer 2 (data-link layer) of the OSI reference stack

QPSK Acronym for Quadrature Phase Shift Keying, a method of modulating digital signals onto a radio-frequency carrier signal using four phase states to code 2 digital bits RBOC Regional Bell Operating Company A regional telephone company

RC4 A security algorithm used by WEP Openly considered a defeated algorithm, RC4 was developed in 1987 by Ron Rivest for RSA Data Security, and was a propriety algorithm until 1994, when the code was posted to the Internet and thus to the rest of the world repeater A device that regenerates and propagates radio or electrical signals between two network segments RF Acronym for radio frequency Generally refers to wireless communications with frequencies below 300 GHz The term RF is commonly used too broadly to cover all types of wireless RFC Acronym for Request for Comments, a document series used as the primary means for communicating information about the Internet Probably the best-known RFC versions are from the IEEE Some RFCs are designated as Internet standards Most RFCs document protocol specifications such as Telnet and FTP, but some are humorous or historical RFCs are available online from numerous sources RJ connector Short for Registered Jack connector, a standard connector originally used to connect telephone lines RJ connectors are now used for telephone connections and for 10BaseT and other types of network connections RJ-11, RJ-12, and RJ-45 are popular types of RJ connectors round A term of art relative to security that refers to a set of encryption operations performed on a block of information For example, 64 DES uses 16 rounds of operations to produce the final version of the ciphertext, which can then be transmitted over an open BBFW link or other unsecured method of transmission router A router, in IT parlance, is a network element that typically operates at Layer 3 of the OSI stack, and it essentially performs the task for which it is named the routing of information A router is used to connect two or more personal computers, and is therefore quite common to home-based networks It typically also interfaces a small office or home office network and the Internet at large; in other words, it can also be a gateway device between a network and other networks Home office and smaller enterprise networks often have 80211 wireless capabilities built into the router; this allows wireless access by the local network elements such as smartphones and desktop and laptop computers, and provides connectivity to the outside world RSA A public-key cryptographic system that may be used for encryption and authentication Named for the inventors of the RSA security technique: Rivest, Shamir, and Adelman

Appendix A: