C - C is a structured, procedural programming language that has been widely used both for operating systems and applications and that has had a wide following in the academic community. Many versions of Unix-based operating systems are written in C.
C++ - C++ is an object-oriented programming (OOP) language that is viewed by many as the best language for creating large-scale applications. C++ is a superset of the C language.
C# – C# (pronounced "C-sharp") is an object-oriented programming language from Microsoft, which aims to combine the computing power of C++with the programming ease of
Visual Basic. C# is based on C++ and contains features similar to those of
Java.
CardBus is the trade name for an advanced
PC Card (also known as
PCMCIA card) specification. The technology is used primarily in notebook and portable computers. The CardBus card fits in a slot like a conventional PC card.
CardBus allows for all the functions that are possible with PC cards, but with several improvements.
A carrier, or carrier signal, is a transmitted electromagnetic pulse or wave at a steady base
Frequency on which data can be transmitted. These pulses or waves can be light, radio, sound, electronic, or microwave in nature.
Varying the base frequency or the wave phase, of the carrier is called
Modulation.
CAT5 is one of the many categories of unshielded twisted pair (UTP) cables. The specifications describe the cable material as well as the types of connectors and junction blocks to be used in order to conform to a category. CAT5 cables support up to 100Mbps transmission speeds over a distance of 100 meters.
See also: 10BASET, 100BASET.
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CCD –Charged Coupled Device
A CCD is a light-sensitive integrated circuit that stores and displays data. Some Barcode scanners are available with CCD scan engines. CCD scanners typically used a bank of LEDs for a light source. CCD scanners are quite inexpensive when compared to Lasers and Imagers.CCD scanners have a fixed aperture size and can only read barcodes from a very short distance. CCD scanners are inexpensive.
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CCK – Complimentary Code Keying
CCK is a
Modulation technique used by the IEEE802.11b specification. A complementary code contains a pair of finite
Bit sequences of equal length, such that the number of pairs of identical elements (1 or 0) with any given separation in one sequence is equal to the number of pairs of unlike elements having the same separation in the other sequence.
Wireless networks using the
802.11b specification employ CCK to operate at data speeds of up to a theoretical maximum of 11 Mbpsin the
RF band at 2.400 Hz to 2.4835 GHz. Networks using the
802.11g specification employ CCK when operating at
802.11b speeds. At higher speeds (up to a theoretical maximum of 54 Mbps), 802.11g
WLANs use more sophisticated modulation scheme called Orthogonal
Frequency Division
Multiplexing (
OFDM). This is the modulation method used by 802.11a WLANs in the RF band at 5.725 GHz to 5.850 GHz.
CCX –Cisco Compatible eXtensions
CCX is a program by Cisco which promotes unique feature sets of industry and Cisco standards and Interoperability amongst Client devices communicating with Cisco Access Points. There are four versions of CCX -V1, V2, V3 and V4.
V1 is typical of what would be found on a Cisco compatible PDA and other portable data collection computers
V3 is typical of what would be found on a Cisco compatible Windows desktop PC
CDMA –Code Division Multiple Access
CDMA is
Modulation a technology that refers to any of several
Protocols used in so-called second-generation (2G) and third-generation (3G)
Wireless communications.
Some data collection computers are available with CDMA radios that use cell phone technology.
Windows CE is an operating system from Microsoft designed for hand held computers. The CE operating system and the subset
PocketPC operating system are designed for ¼ size VGA screens. CE has a Graphical User
Interface(
GUI) and is designed for application use in the business environment.
CE.
NET is actually CE version 4.2 but is built from the ground up. Windows CE .NET supports Microsoft eMbedded Visual C++® and Microsoft Visual Studio® .NET, providing a complete development environment for building Web services and applications for the Microsoft .NET Compact Framework.
CE .NET 4.2 serves as the underlying
OS for Windows Mobile2003 for Pocket PC.
A CompactFlash(CF) card is a popular memory card developed by SanDisk in 1994 that uses Flash memory to store data on a very small card. A CompactFlash card makes data easy to add to a wide variety of computing devices, including digital cameras and music players, desktop computers, personal digital assistants (PDAs), digital audio recorders, and photo printers. Based on the Personal Computer Memory Card International Association (PC CardPCMCIA) specifications, CompactFlash measures 43 X 36 mm (about the size of a matchbook) and is available with storage capacities ranging up to 1 gigabyte (GB), with higher capacities corresponding to higher prices.
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Founded in 1984 by a group of computer scientists from Stanford University, Cisco has grown into the leading manufacturer of wired and
Wireless network equipment used on the Internet and on private networks world wide.
A client is the requesting program or user in a
Client/Server relationship. For example, the user of a Web browser is effectively making client requests for pages from
Servers all over the Web. The browser itself is a client in its relationship with the computer that is getting and returning the requested HTMLfile. The computer handling the request and sending back the
HTML file is a server.
Other examples of clients are email such as Outlook, Terminal Emulation (
TE) and custom software applications on a data collection computer that communicate with a server application in
Real-Time.
Client/
Server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfills the request. In a network, the client/server model provides a convenient way to interconnect programs that are distributed efficiently across different locations. Examples of client/server include –
ms Outlook running on your PC and your corporate email server. – Any PC with a web browser requesting web pages from a web server. - Your PC running Word and sending a print job to a print server. – A hand held data collection computer running a
TE client talking with a TE server on a
Mainframe.
Client/Server can be contrasted with
Peer-to-Peer.
Coaxial cable is called "coaxial" because it includes one physical channel that carries the signal surrounded (after a layer of insulation) by another concentric physical channel, both running along the same axis. The outer channel serves as a ground. Many of these cables or pairs of coaxial tubes can be placed in a single outer sheathing and, with repeaters, can carry information for a great distance.
Coaxial cable used in networking typically comes in the following varieties:
10Base2, 10Base5
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The Codabar, is a variable-length Barcode that can print numeric values and some punctuation characters. This bar code is useful for encoding dollar figures and mathematical figures because a decimal point, plus sign and minus sign can be encoded.
A Codabar Symbol code can encode the following 16 characters:
Numbers: 0 to 9
Symbols: -$ : / . +
The Codabar barcode must begin and end with one of four special start/stop characters, A, B, C, or D. This Symbology’s primary use is to encode normal numeric data.
The checksum options for the Codabarbar code include: None, Mod 16 or Mod 10.
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See Symbologies (List)for a list of common symbologies.
A Barcode Symbology. Code 11, also known as USD-8, was developed as a high-density numeric-only symbology. It is used primarily in labeling telecommunications equipment. The symbology is discrete and is able to encode the numbers 0 through 9, the dash symbol (-), and start/stop characters. Code 11 is not very secure in that printing imperfections can quite easily convert one character into another valid character. Data integrity is obtained by using one, or sometimes two, check characters.
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See Symbologies (List)for a list of common symbologies.
The Code 128 Symbology is a variable length symbology which can encode numeric, upper and lower case alphabetic characters (the full 128 ASCII character set), punctuation, special function and control data characters. It also enables numeric data to be compressed into double the normal Density by encoding two digits per encoded character.
Code 128 has three different character sets, called subset A, subset B, and subset C, which allow the bar code to be optimized for size.
Code 128 requires a mod 103 checksum.
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See Symbologies (List)for a list of common symbologies.
Code 16K is multi row (stacked row) Barcode Symbology, which offers high information Density encoding of the full (128-character) ASCII set and double density encoding of numeric data strings
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See Symbologies (List)for a list of common symbologies.
The Code 39 Symbology (also called "3 of 9“and “the universal code”), developed by Intermec, is probably the most commonly used Barcode, and it is a standard for many government barcode specifications. This barcode encodes numbers, uppercase letters, and some punctuation.
The list of valid characters for the Code 39 barcode includes:
Capital letters A to Z
Numbers 0 to 9
The space character
Symbols -. $ / +%
The input string is printed as it is read except for lowercase letters, which are converted to uppercase. Any spaces are bar coded, as are other valid characters.
The checksum options for include: None or Mod 43.
By using one of the four punctuations characters ($ / + %) paired with an uppercase letter, Code 39 is able to encode the ASCII character set.
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See Symbologies (List)for a list of common symbologies.
The Code 49
Symbology is a stacked row
Barcode that can encode 128
ASCII characters. Up to 49 alphanumeric characters or 81 numeric characters can be encoded. These characters are encoded in two to eight rows. Each row is divided by a separator bar. The top and bottom of the symbol also have separator bars that extend to the ends of the minimum
Quiet Zones.
All characters are encoded in double-density mode. This means that two characters are encoded into one character width, making the sizeof the bar code smaller.
Code 49 has six special function control codes that some readers recognize. These can be bar coded by using certain decimal ASCII values in your input string.
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See
Symbologies (List)for a list of common symbologies.
The Code 93
Symbology is a more compact version of
Code 39, but it is not quite as easy for
Barcode readers to read because of the way it is encoded. Code 93 derives its name from the fact that every character is constructed from nine elements arranged into three bars with their adjacent spaces.
The checksum for Code 93 is automatically set to 2 Mod 47s.
Extended Code 93 uses Code 93 to encode the entire 128
ASCII character set by using combinations of control characters and basic data characters.
See
Symbologies (List)for a list of common symbologies.
A
Barcode Symbology. Code One is an
Area Symbology.
Code One is a two-dimensional matrix symbology containing dark and light square data modules and a finder pattern of parallel lines in the symbol's interior. An area
Imager is necessary to scan the symbology. Code One is designed with a fixed level of error correction capability. It supports industry standard escape sequences to define international code pages and special encodation schemes. Code One is used both for large data file encoding and small item marking applications.
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See
Symbologies (List) for a list of common symbologies.
For a given font or
Symbology, cpi (characters per inch) is the number of typographic or data characters that will fit in each inch of a printed line.
Barcode Density is usually specified in cpi.
CRM –Customer Resource Management
CRM is an information industry term for methodologies, software, and usually Internet capabilities that help an enterprise manage customer relationships in an organized way. For example, an enterprise might build a
Database about its customers that described relationships in sufficient so that management, salespeople, people providing and perhaps the customer directly could access information, match customer needs with product plans and offerings, remind customers of service requirements, know what products a customer had purchased, and so forth.
In warehousing, an activity that attempts to reduce costs and total lead time by breaking down received items on the loading dock and immediately matching them with outgoing shipment requirements, instead of stocking the items in warehouse locations and returning to pick for orders at a later time.
CSMA/CD –Carrier Sense Multiple Access with Collision Detection.
CSMA/CD is the media
Ethernet access method used in which is specified in the
802.3 specification from the
IEEE. CSMA/CD operates on a first come first served basis. Each device with something to transmit, first listens to the
Carrier, if clear it attempts to transmit. In the case of two devices transmitting at exactly the same time, known as a collision, each device will wait a random amount of time before retrying the transmission.
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an external modem that converts a digital data frame from the communications technology used on a local area network (
LAN) into a frame appropriate to a wide-area network (
WAN) and vice versa. For example, if you have a Web business from your own home and have leased a digital line (perhaps a T-1 or fractional T-1 line) to a phone company or a
Gateway at an Internet service provider, you have a CSU/DSU at your end and the phone company or gateway host has a CSU/DSU at its end.
In warehousing, a way of physically counting/verifying inventory levels in the warehouse.
An inventory system where counts are performed continuously, often eliminating the need for an annual overall inventory. It is usually set up so that A items are counted regularly (i.e., every month), B items are counted semi-regularly (every quarter or six months), and C Items are counted perhaps only once a year.