TCO – Total Cost of Ownership

TCP/IP – Transmission Control Protocol/Internet Protocol

Defined by the IETF, TCP/IP is the basic communication Protocol of the Internet. It can also be used as a communications protocol in a private network.

Transmission Control Protocol (TCP) manages the assembling of a message or file into smaller packetst hat are transmitted over the Internet and received by a TCP layer that reassembles the Packets into the original message.

Internet Protocol (IP), handles the address part of each packet so that it gets to the right destination. Each Gateway on the network checks this address to see where to forward the message. Even though some packets from the same message are routed differently than others, they'll be reassembled at the destination.

Application layer protocols that use TCP/IP include HTTP, FTP, TELNET, and SMTP.

TDMA – Time Division Multiple

TE – Terminal Emulation

TE is the act of emulating a dumb data terminal to remotely access a host computer or Mainframe. Typical terminals emulated include the following models:

• ANSI
• IBM3270
• IBM5250
• DECVT100, 220, 320, and 420.

TELNET

TELNET is the Protocol used to perform Terminal Emulation (TE). TELNET is part of the IP protocol suite.

TFTP – Trivial File Transfer

Trivial File Transfer Protocol (TFTP) is a network protocol for transferring files that is simpler to use and faster Trivial File Transfer Protocol (TFTP) is a network protocolfor transferring files that is simpler to use and faster than the File Transfer Protocol (FTP) but less capable. Whereas FTP uses the TCP protocol, TFTP uses the User Datagram Protocol (UDP) rather than the Transmission Control Protocol (TCP).

TFTP is part of the IPprotocol suite.

Thermal Transfer

Thermal transfer printers use the same basic technology as Direct Thermal printers, but with the elimination of chemically-coated media material in favor of a non- sensitized face stock and a special inked ribbon. A durable, polyester ribbon film coated with a dry thermal transfer ink is placed between the thermal print head and label. The thermal print head is used to transcribe the ink onto the label surface, where it cools and anchors to the media surface. The polyester ribbon is then peeled away, leaving behind a stable, passive image.

Advantages: High contrast, crisp image, bar code print quality with a durable, long-life and archival image stability, maximum readability and IR scan ability, high contrast text, graphic and bar code print capability, and capability of printing on an unlimited variety of media stock –except multi-form.

Disadvantages: Cannot print on media without use of ribbon –resulting in higher supply costs over direct thermal, single pass thermal transfer ribbon can be wasteful if little is printed on it, ink transfer ribbon is a poor candidate for re-cycling, and to obtain optimum print quality in thermal transfer, the ribbon and media substrate MUST be compatible - otherwise, the heat from the print head could melt the ribbon onto the label causing internal printer problems.

Thick Client

A thick Client usually refers to a PC or other computer or an application that is considered Robust. It performs a variety of complex tasks which communicate with a host Server application.

Almost all custom client software would be considered thick client.

Thicknet

Thicknet (sometimes called ThickWire) is a commonly used term for the larger size of coaxial cableused in Ethernet local area networks. Thicknet is 0.4 inches in diameter and has 50 ohms of electromagnetic impedance. Thicknet was the original Ethernet wiring, but Thinnet, which is cheaper and can be installed more easily, is the more commonly installed cable of the two for Ethernet networks. Thicknet, aka 10BASE-5 continues to be used for Backbone wiring. A much cheaper alternative to Thinnet on an Ethernet network is unshielded twisted pair (UTP).

Thin Client

A thin Client is a low-cost, centrally-managed computer devoid of CD-ROM players, diskette drives, and expansion slots. The term derives from the fact that small computers in networks tend to be clients and not Servers. Since the idea is to limit the capabilities of these computers to only essential applications, they tend to be purchased and remain "thin" in terms of the client applications they include.

The term also refers to software applications that provide a minimal but common function. Terminal Emulation (TE) applications are referred to as Thin Client applications.

Thinnet

Thinnet (sometimes called ThinWire) is a commonly used term for the smaller size of coaxial cableused in Ethernet local area networks. Thinnet, also known as Cheapernet and 10BASE-2, is 0.2 inches in diameter and has 50 ohms of electromagnetic impedance. Thicknet was the original Ethernet wiring, but Thinnet, which is cheaper and can be installed more easily, is the more commonly installed Ethernet wire of the two. Thinnet continues to be used for Backbone wiring. A much cheaper alternative to Thinnet on an Ethernet network is unshielded twisted pair (UTP).

Time and Attendance

Time and Attendance applications help companies track much more than just hours worked. They also provide accurate up-to-date knowledge of the personnel on hand and ensure a greater level of security.

These applications meet requirementsfor increased security, personnel tracking, and/or assuring the matching of skill sets with equipment.

TKIP – Temporal Key Integrity Protocol

TKIP, pronounced tee-kip, is part of the IEEE802.11i encryption standard for WLANs. TKIP is the next generation of WEP, (Wired Equivalent Privacy), which is used to secure 802.11b Wireless LANs. TKIP provides per-packet key mixing, a message integrity check and a re-keying mechanism, thus fixing the flaws of WEP.

TKIP is also one of the key technologies behind WPA and WPA-PSK.

TLS – Transport Layer Security

TLS is a Protocol that guarantees privacy and data integrity between Client/Server applications communicating over the Internet. The TLS protocol is made up of two layers:

• The TLS Record Protocol--layered on top of a reliable transport protocol,
  such as TCP, it ensures that the connection is private by using symmetric data
  encryption and it ensures that the connection is reliable. The TLS Record Protocol also is used for encapsulation of higher-level protocols, such as the TLS Handshake Protocol.
• The TLS Handshake Protocol--allows authentication between the Server and
  Client and the negotiation of an encryption algorithm and cryptographic keys before the application protocol transmits or receives any data.

TLS is application protocol-independent. Higher-level protocols can layer on top of the TLS protocol transparently. Based on Netscape’s SSL 3.0, TLS supercedes and is an extension of SSL. TLS and SSL are not interoperable.

TLS is used with EAP to provide authentication between Wireless clients and a RADIUS as per the 802.1x standard.

Token Ring

A Token Ring network is a LAN in which all computers are connected in a ring or star topology and a bit-or token- passing scheme is used in order to prevent the collision of data between two computers that want to send messages at the same time. Token Ring was developed by IBM and is now specified by the IEEEin 802.5. The IEEE 802.5 Token Ring technology provides for data transfer rates of either 4 or 16Mbps.

Touch Memory

Touch Memories or memory buttons are electronic identification devices that are accessed when a touch probe comes into contact with a memory button. Memory chips are often packaged in coin- shaped stainless steel containers (buttons) to withstand harsh environments and are capable of holding large amounts of data (over 4,096 characters). Read and/or write operations between the probe and memory chip are performed with just a momentary contact. Thousands of reads and writes can be performed with a single chip and data integrity can last over 100 years. Touch memory buttons are also available with Real-Time clocks and temperature sensors.

iButtons are probably the most popular touch memory devices.

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