Bridging the network divide





568A Standard
EIA/TIA 568A is a standard to create multiproduct, multivendor, standard for connectivity. The 568A "standard" is not to be confused with 568A or 568B wiring schemes.

568A or 568B Wiring Scheme
568A or 568B is a wiring scheme belongining to the "568A standard". These wiring schemes dictate the pin assignments to the pairs of cat 5 cable.

IEEE's specifications for running CSMA/CD networking over unshielded twisted-paid cable (see also IEEE 802.33)

802.3 Standard
IEEE standard describing CSMA/CD networking. The standard contains many subelements, including 10-Base-T

Asynchronous Digital Subscriber Line is a technology that delivers high date transfer speeds over existing analogue phone lines.

American Standards Institute (ANSI)
An organisation that develops and publishes standards for codes, data alphabets, and signalling schemes.

A method of transmission in which the time intervals between characters are not required to be equal.

The decrease in power of a signal as it travels along the cable. Attenuation is undesirable bexuase it reduces the changes in voiltage that signal a one or a zero in the digital signalling stream.

The maximum data sent through a connection. Usually measured in bits per second.

BNC Connector
A small coaxial connector with a half-twist locking shell. BNC is an acronym for Bayone-Neill-Concelman

Transfers data rates from 512,0000 to super-fast 16,000,000 bits per second.
Carrier-Sense Multiple Access with Collision Detection (CSMA/CD)
A media sharing scheme in which stations listen listen in to what's happening on the network media; if the cable is not in use, the station is permited to transmit its message.

Category 3 Cable (Cat3)
A voice-grade UTP cable used for digital telphone private branc exchanges and for local area networks.

Category 5E cable (Cat5)
Nominally the highest grade of unshielded twisted-pair cable used for LANs. Category 5 Enhanced components and systems are specified up to 100 MHz. They can support very high-speed protocols like Gigabit Ethernet using complex encoding and de-coding techniques

Coaxial Cable
A type of network media. Coaxial cable contains a copper inner conductor surrounded by plastic insulation and then awoven copper of foil shield.

The spillover of a signal from one channel to another. In data communications it is very disruptive. In cable systems, crosstalk comes from adjacent cable pairs.

Crossover Cable
A cable to connect two ethernet units directly. The can require a crossover cable that is connected with transmit-to-receive and receive-to-transmit.

Calling Line Identity (CLI) displays the phone number of the telephone caller on the answering phone's display.

Computer Telephony Integration is the linking of a telephone system with a computer or network.

A common method of networking computers in a LAN. 10Mbps, 100Mbps, and 1000Mbps standards.

An Intranet that is accessible to computers that are not physically part of a company's own private network, but that is not accessible to the general public

A security system that prevents computers on a network from communicating directly with computers on another network. Instead, all communication is routed through a proxy server, which determines whether a particular message or file may pass to or from the host.

A hardware or software set up that translates between two dissimilar protocols, for example AOL has a gateway that translates between its internal, proprietary email format and Internet
Email format.

Internet Service Providers (ISPs)
An Internet service provider maintains a server that is directly connected to the Internet. You must connect through a service provider unless you are directly connected to the Internet.

Internet Protocol
The signalling standard used to transmit date across the Internet and LANs. IP uses packet switching techniques to send data in small chunks (packets)

A private network inside a company or organisation that uses the same kinds of software that you would find on the public Internet, but which is only for internal use.

IP Telephony
A method to send voice traffic across a date network. Voice signals ore broken down into pockets and reassembled at the receiving end. This eliminates the need for separate voice and data networks by converging all traffic on one network.

Integrated Services Digital Network is a dial up digital public network for voice and data communications with charges based on line rental and usage. ISDN provides a number of advanced telephony services, such as CLI and DDI, which form the basis of today's advanced telephony applications. It is available in two forms: Basic Rote ISDN2e (2 channels) and Primary Rate ISDN30e (30 channels).

A Local Area Network is a computer network limited to the immediate area, usually the some building or floor a building.

LAN Telephony
The convergence of voice and data on a LAN, eliminating the need for separate voice and date networks within an organization.

Leased Line
Lines such as a telephone line or fibre optic cable that is rented for exclusive 24/7 use from your locution to another locution. The highest speed data connections require a leased line.

Network speed is quantified in megabits per second. This is the amount (or speed) in which the data is transferred. 10Mbps is the same as 10,000,000 bit per second, 1000Mbps is the same as 1,000,000,0000 bits per second

Megahertz refers to the analog frequency of the carrier signal that is used to transmit the data. One hertz, is completed when the carrier signal goes from zero, to it's positive peak, back to zero, to it's negative peak, and back to zero again

A modem, or modulator-demodulator, converts signals between the digital format used by computers and the analog format used by ordinary telephone lines. Transfers data rates upto 57,000 bits per second.

Any time you connect two or more computers together so that they con share resources, you have a computer network.

Packet Switching
The method used to move data and voice around a network. In packet switching, all the data is broken up into chunks - each chunk has the address of where it come from and where it is going

QoS -Quality of Service
Used to provide acceptable voice quality across IP networks

A special purpose computer or software package that handles the connection between two or more packet switched networks. Routers spend all their time looking at the source and destination addresses of the packets passing through them and deciding which route to send them on.

A computer, or software package, that provides a specific kind of service to client software running on other computers. The term can refer to a particular piece of software or to the machine on which the software is running

Structured Cabling
A structured cabling system comprises standards-compliant, such as wall outlets and connections, and the cable itself, which is likely to be Category 5e UTP (Unshielded Twisted Pair) copper cabling along the floor, often leading to multimode fibre-optic cable in the backbone or vertical riser of the building.

Used to enhance performance by segmenting the network into similar subnets.

Virtual Private Network usually refers to a network in which some of the ports are connected using the public Internet, but the voice and data sent across the Internet is encrypted, so the entire network is "virtually" private.

Voice Ovr IP is the transmission of voice traffic over a wide area network or the Internet using the IP signalling standard (See IP Gateway)

Wide Area Network is any network that covers an area larger than a single building or site.

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