Black Box DESKTOP TELCO Spezifikationen PDF herunterladen (Seite 43)

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10BASE-T: An Ethernet standard that uses twisted-

wire pairs.

10-GbE (10-Gigabit Ethernet): The fastest Ethernet

standard with a nominal data rate of 10 Gbps,

ten times as fast as Gigabit Ethernet. Can be run

over fiber or copper cable.

100BASE-FX: This Fast Ethernet standard (IEEE 802.3u)

supports 100 Mbps, full-duplex data transmission

over fiber optic cable.

100BASE-T: A high-speed version of Ethernet (IEEE

802.3). Also called Fast Ethernet, 100BASE-T

transmits at 100 Mbps.

100BASE-TX: A popular implementation of the

100BASE-T Fast Ethernet standard. It specifies data

transmission over two-pair (four-wire) Category 5

or higher unshielded twisted-pair (UTP) cable.

1000BASE-LX: A Gigabit Ethernet standard that

defines data transmission over fiber optic cable

using long-wavelength lasers, typically 1300 or

1310 nm. This standard is rated to operate at

up to 2 kilometers over single-mode fiber or 550

meters over multimode fiber, although many

manufacturers will guarantee longer distances.

1000BASE-SX: A Gigabit Ethernet standard defining

data transmission over 850-nm fiber optic cable

at distances of up to 220 m. Many manufacturers

will guarantee longer transmission distances.

1000BASE-T: A Gigabit Ethernet standard that defines

data transmission at 1000 Mbps over twisted-pair

copper cable.

1000BASE-X: Describes Gigabit Ethernet transmission

over fiber. Includes 1000BASE-LX and 1000BASE-SX.

Access Point (AP): A device that links wireless devices

to a network. Also known as a base station or

wireless access point (WAP).

ACR: Attenuation-to-Crosstalk Ratio. The ratio of

the attenuated signal to NEXT. It's one factor in

determining how far a signal can be transmitted

in any given medium.

Adapter: A device that joins different kinds of

connectors or interfaces.

Address:

1) The number of a specific memory or peripheral

storage location.

2) The number assigned to a node on a network.

Administration: The process of identifying and

documenting installed structured cabling.

AFF (Above Finished Floor): A common measurement

used when specifying the mounting height of

interior fixtures such as counters, cabinets, etc.

AHJ (Authority Having Jurisdiction): The local

governmental agency that enforces building

codes.

Alarm: Any message that alerts the user to a problem

in equipment or data.

Alien Crosstalk: An unwanted signal introduced

into wire pairs from adjacent cables.

ANSI (American National Standards Institute):

This nonprofit organization oversees the

development and accreditation of voluntary

consensus standards for products, services, systems,

and personnel in the U.S. It also coordinates U.S.

standards with international standards.

Architecture:

1) The design of a computer system, which sets

the standard for all devices that can connect

to it and all the software that can run on it.

2) The design of a communications system, which

includes the hardware, software, access

methods, and protocols used.

Attenuation: The decrease of signal strength

as it travels through a medium or interconnect.

Attenuation is measured in decibels relative

to a reference signal. Contrast with Gain.

AWG (American Wire Gauge): A method of

measuring wire-conductor diameter. The number

refers to the number of steps involved in drawing

the wire. The more a wire is drawn or sized, the

smaller the diameter will be. For example, 24 AWG

wire is smaller than 19 AWG wire.

Backboard: A plywood panel mounted on the wall of

a telecommunications room. Used for mounting

telecommunications equipment.

Backbone: A high-capacity network, conduit, or cable

that links other lower-capacity networks together.

It often uses the highest-speed transmission paths

in the network and may also run the longest

distance.

Backbone Cabling: Cabling between floors in a

building or between buildings in a campus.

Bandwidth:

1) The transmission capacity of a computer

channel, communications line, or bus.

2) The difference between the lowest and highest

frequencies in a transmission signal.

Barrier: A partition that separates cables in a cable

raceway.

BAS (Building Automation System): An integrated,

intelligent network of devices that provides

automated control of building systems such as

entry, fire detection, and climate control.

Baud: A line's signaling rate, the switching speed,

or number of frequency changes made per second.

Often used loosely as a synonym for “bps.”

Bend Loss: Increased attenuation in a fiber that

results from the fiber being bent or from

minute distortions within the fiber.

Bend Radius: A measurement of a cable’s flexibility;

the radius of the smallest circle you can form with

the cable without damaging it.

BNC Connector (Bayonet-Neill-Concelman): A

commonly used connector for coaxial cable.

After insertion, the plug is turned, tightening

the pins in the socket.

Bonding: The permanent connecting of conductors

to a building grounding infrastructure.

Broadband: High-frequency data transmission,

typically at least 1.5 Mbps over fiber or coax cable.

Building Core: A space within a building used for

services such as electrical, plumbing, and elevators.

Bus: A common pathway, or channel, between

multiple devices. In a bus topology, nodes are

all connected to a single channel.

Campus Area Network: A network that includes

buildings in a limited geographic area such as a

college or corporate campus or an industrial park.

Capacitance: A buildup of voltage along the surface of

a metal wire while it’s conducting an electrical signal.

Carrier: An alternating current that oscillates at

a fixed frequency and serves as a boundary or

baseline signal over which information can

be transmitted. Changes in the carrier signal's

amplitude, frequency, or phase represent the

actual data being transmitted.

Category: EIA/TIA-568 standards defining

performance of UTP cable.

Category 3: UTP cable specified for voice and data

applications at 16 MHz or 10 Mbps.

Category 4: UTP cable specified to 20 MHz

or 16 Mbps. This category is now obsolete.

Category 5: UTP, connectors, and systems. Specified

for voice and data applications to 100 MHz.

Category 5e: Also called Enhanced Category 5.

This UTP standard supports voice and data

applications to 100 MHz and is suitable for Fast

Ethernet and Gigabit Ethernet applications.

Category 6: A UTP performance classification for

twisted-pair cables, connectors, and systems.

Specified up to 250 MHz for voice and data.

Also known as Class E.

Category 6a (CAT6a): A 10-Gigabit over copper

proposal of the CAT6 standard. Extends CAT6

electrical specifications from 250 MHz to 500 MHz.

Also known as Class E

Category 7 (Proposed): Cables and connectors with

transmission characteristics to 600 MHz. Unlike

other cable categories, Category 7 cable has

individually shielded pair cables. Also known

as Class F.

CATV (Community Antenna Television): Cable

television that uses one antenna or set of

antennas to serve a group of subscribers.

CCTV (Closed-Circuit Television): A private TV system

with a limited number of receivers.

Ceiling Distribution: Cabling installed in the space

above a dropped ceiling.

Centralized Fiber Optic Cabling: A fiber structured

cabling configuration where the backbone cable

extends to the workstation. See Collapsed

Backbone.

Central Office: The telephone switching facility that

interconnects subscribers’ telephone lines to the

rest of the telephone system.

Channel: The end-to-end transmission path including

the connecting equipment, patch cords, equip-

ment cables, and cross-connect cords in the work

area and telecommunications room. Contrast with

Permanent Link.

Churn (Change in User’s Location): The relocation

of a user’s work area in a building.

Cladding: In fiber optic cable, the outer layer on

the fiber core. Cladding promotes the internal

reflection of light and also serves as protection

for the fiber core.

Cleave: A controlled break in an optical fiber

intended to provide a perfect 90° endface for

connection.

Collapsed Backbone: A wiring configuration that

uses the backplane of a single switch rather than

several switches linked together. See Centralized

Fiber Optic Cabling.

Conduit: A pipe, usually metal, that contains data,

voice, and electrical wiring.

Connector: Any plug, socket, or wire that links two

devices together.

Consolidation Point: An interconnection device in

the horizontal cabling that enables the cable to be

split into two to support clusters in zone cabling.

Core: The center fiber of a fiber optic cable through

which light is transmitted.

Cross-Connect: Hardware such as patch panels and

punchdown blocks, used to connect two groups

of cables.

Cross-Pinned or Crossover Cable: A configuration

that enables two DTE or two DCE devices to

communicate.

Crosstalk: Interference from an adjacent

communication channel.

Daisychain: To connect devices in a series, one after

the other, where the transmitted signals go to the

first device, then to the second, and so on.

Data Rate, Data Signaling Rate: The data-transfer

speed within the computer or between a

peripheral and computer. The data-transmission

speed in a network.

Delay Skew: The difference in propagation delay

between the slowest and fastest pairs in a cable.

Delay skew is caused by wires of different lengths

within twisted-pair cable.

Demarcation Point: The point in a facility where the

service provider cabling and the customer-owned

cabling interconnect.

Digital Loopback: A technique for testing the digital

processing circuitry of a communications device

that can be initiated locally or remotely via a

telecommunications circuit.

Digital PBX (Digital Private Branch Exchange): A

modern PBX that uses digital methods for

switching. (Older PBXs used analog methods.)

Digital Service: High-speed digital data-transmission

services offered for lease by telecommunication-

service providers including ISDN, Frame Relay, T1,

and dedicated or switched 56-kbps transmission

lines.

Disaster Recovery: A plan for duplicating computer

operations after a catastrophe such as a fire or

earthquake occurs. It includes routine off-site

backup as well as procedures for activating

necessary information systems in a new location.

Dish: A saucer-shaped (parabolic) antenna that

receives—or transmits and receives—signals

from a satellite.

Glossary

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