Motorola RS409 Guía de usuario descargar pdf (Pagina 109)

Glossary - 7

Scan Area. Area intended to contain a symbol.

Scanner. An electronic device used to scan bar code symbols and produce a digitized pattern that corresponds to the

bars and spaces of the symbol. Its three main components are:

1. Light source (laser or photoelectric cell) - illuminates a bar code.

2. Photodetector - registers the difference in reflected light (more light reflected from spaces).

3. Signal conditioning circuit - transforms optical detector output into a digitized bar pattern.

SDK. Software Development Kit

Secure Sockets Layer (SSL). SSL is a commonly-used protocol for managing the security of a message transmission

on the Internet. SSL uses a program layer located between the Internet's Hypertext Transfer Protocol (HTTP) and

Transport Control Protocol (TCP) layers. SSL is included as part of both the Microsoft and Netscape browsers and

most Web server products. Developed by Netscape, SSL also gained the support of Microsoft and other Internet

client/server developers as well and became the de facto standard until evolving into Transport Layer Security. The

“sockets” part of the term refers to the sockets method of passing data back and forth between a client and a server

program in a network or between program layers in the same computer. SSL uses the public-and-private key

encryption system from RSA, which also includes the use of a digital certificate.

Shared Key. Shared Key authentication is an algorithm where both the AP and the MU share an authentication key.

SID. System Identification code. An identifier issued by the FCC for each market. It is also broadcast by the cellular

carriers to allow cellular devices to distinguish between the home and roaming service.

SMDK. Symbol Mobility Developer’s Kit.

Soft Reset. See Warm Boot.

Subnet. A subset of nodes on a network that are serviced by the same router. See Router.

Subnet Mask. A 32-bit number used to separate the network and host sections of an IP address. A custom subnet mask

subdivides an IP network into smaller subsections. The mask is a binary pattern that is matched up with the IP

address to turn part of the host ID address field into a field for subnets. Default is often 255.255.255.0.

Substrate. A foundation material on which a substance or image is placed.

Symbol. A scannable unit that encodes data within the conventions of a certain symbology, usually including start/stop

characters, quiet zones, data characters and check characters.

Symbology. The structural rules and conventions for representing data within a particular bar code type (e.g. UPC/EAN,

Code 39, PDF417, etc.).

TCP/IP. (Transmission Control Protocol/Internet Protocol) A communications protocol used to internetwork dissimilar

systems. This standard is the protocol of the Internet and has become the global standard for communications. TCP

provides transport functions, which ensures that the total amount of bytes sent is received correctly at the other end.

UDP is an alternate transport that does not guarantee delivery. It is widely used for real-time voice and video

transmissions where erroneous packets are not retransmitted. IP provides the routing mechanism. TCP/IP is a

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Motorola RS409 Guía de usuario Pagina 109