A high-capacity communications circuit service such as a private line T-1 or T-3.

home-run cable

A cable run that connects a user outlet directly with the telecommunications or wiring closet. This cable has no intermediate splices, bridges, taps, or other connections. Every cable radiates out from the central equipment or wiring closet. This configuration is also known as star topology and is the opposite of a daisy-chained cable that may have taps or splices along its length. Home-run cable is the recommended installation method for horizontal cabling in a structured cabling system.

hop

A connection. In routing terminology, each router a packet passes through is counted as a hop.

horizontal cabling

The cabling between and including the telecommunications outlet and the horizontal cross-connect. Horizontal cabling is considered the permanent portion of a link; may also be called horizontal wiring.

horizontal cross-connect (HC)

A cross connect that connects the cabling of the work area outlets to any other cabling system (like that for LAN equipment, voice equipment).

HRC

Hybrid ring control.

hub

A device that contains multiple independent but connected modules of network and internetworking equipment that form the center of a hub-and-spoke topology. Hubs that repeat the signals that are sent to them are called active hubs. Hubs that do not repeat the signal and merely split the signal sent to them are called passive hubs. In some cases, hub may also refer to a repeater, bridge, switch, or any combination of these.

HVAC

Heating, ventilation, and air conditioning.

hybrid cable

A cable that contains fiber, coaxial, and/or twisted-pair conductors bundled in a common jacket. May also refer to a fiber-optic cable that has strands of both single-mode and multimode optical fiber.

hybrid connector

A connector containing both fiber and electrical connectivity.

An optical fiber with a hard plastic cladding surrounding a step index silica core.

hardware address

The address is represented by six sections of two hexadecimal addresses; for example, 00-03-fe-e7-18-54. This number is hard coded into networking hardware by manufacturers. Also called the physical address; see also MAC address.

hardware loopback

Connects the transmission pins directly to the receiving pins, allowing diagnostic software to test whether a device can successfully transmit and receive.

HC

See horizontal cross-connect.

HDSL

High bit-rate digital subscriber line. See digital subscriber line.

head end

The central facility where signals are combined and distributed in a cable television system or a public telephone system. See central office.

header

The section of a packet (usually the first part of the packet) where the layer-specific information resides.

headroom

The number of decibels by which a system exceeds the minimum defined requirements. The benefit of more headroom is that it reduces the bit-error rate (BER) and provides a performance safety net to help ensure that current and future high-speed applications will run at peak accuracy, efficiency, and throughput. Also called overhead or margin.

hertz (Hz)

A measurement of frequency defined as cycles per second.

HF

High frequency.

A billion hertz or cycles per second.

GIPOF

Graded index plastic optical fiber.

GOSIP

Government open system interconnect protocol.

graded-index fiber

An optical-fiber cable design in which the index of refraction of the core is lower toward the outside of the core and progressively increases toward the center of the core, thereby reducing modal dispersion of the signal. Light rays are refracted within the core rather than reflected as they are in step index fibers. Graded index fibers were developed to lessen the modal dispersion effects found in multimode fibers with the intent of increasing bandwidth.

ground

A common point of zero potential such as a metal chassis or ground rod that grounds a building to the earth. The ANSI/TIA/EIA-607 Commercial Building Grounding and Bonding Requirements for Telecommunications Standard is the Standard that should be followed for grounding requirements for telecommunications. Grounding should never be undertaken without consulting with a professional licensed electrician.

ground loop

A condition where an unintended connection to ground is made through an interfering electrical conductor that causes electromagnetic interference. See also ground loop noise.

ground loop noise

Electromagnetic interference that is created when equipment is grounded at ground points having different potentials, thereby creating an unintended current path. Equipment should always be grounded to a single ground point.

guided ray

A ray that is completely confined to the fiber core.

half-duplex transmission

Data transmission over a circuit capable of transmitting in either direction. Transmission can be bidirectional but not simultaneously.

halogen

One of the following elements: chlorine, fluorine, bromine, astatine, or iodine.

Salahkan broadband, kata AT&T. Selama beberapa dekade berurusan dengan aliran bandwidth yang “dikonsumsi” oleh voice dan modem dialup membuat AT&T menggelengkan kepala. Peningkatan layanan DSL dan cable modem yang signifikan selama tahun 2000 telah menyebabkan AT&T harus berhadapan dengan pelonjakan volume transmisi data. Dan itu diperkirakan akan bertambah besar sampai 50 kali lipat antara sekarang dan tahun 2015. Itu cukup, kata AT&T, bagi kita untuk membuat sistem crash.

Dalam rangka mengantisipasi pelonjakan ini, AT&T mengatakan mereka sedang menginvestasi dana sebesar $19 milyar (sekitar Rp175,92 trilyun) untuk meng-upgrade backbone Internet, router, server, dan koneksi dimana lalu lintas data yang sangat besar diproses.

Tentu saja, AT&T menggunakan cara ini untuk mengatasi penggunaan broadband. Web video (terutama high-definition video) sering disebut-sebut sebagai biang kerok di balik isyu habisnya bandwidth ini. AT&T mengatakan bahwa lalu lintas video sendiri akan memakan 80% traffic dalam dua tahun mendatang, dibandingkan hanya 30 sekarang. Kita tidak tahu kenapa YouTube tidak kolaps menghadapi tekanan ini. Hmmm.

Sementara itu, banyak kalangan berspekulasi bahwa ini hanyalah sebuah permulaan sebelum AT&T mengumumkan (atau tidak mengumumkan, hanya melakukan) sebuah sistem prioritas seperti yang telah dilakukan Comcast… yang hanya menuai ejekan. Net neutrality (yang melarang tarif khusus untuk aplikasi Internet dan tujuan tertentu) merupakan topik yang sedang hangat-hangatnya dibahas di Capitol Hill, dan para penyedia layanan telekomunikasi gencar memerangi ide tersebut karena mereka akan mendapat keuntungan tambahan untuk lalu lintas dan komunikasi jaringan yang berbeda. Jika seluruh Internet akan mengalami kemacetan, maka argumentasi AT&T lebih masuk akal, bukan?

Sumber: Yahoo! Tech

Fiber to the school.

full duplex transmission

Data transmission over a circuit capable of transmitting in both directions simultaneously.

fundamental mode

The lowest number mode of a particular waveguide.

fusion splicing

A splicing method accomplished by the application of localized heat sufficient to fuse or melt the ends of the optical fiber, forming continuous single strand of fiber. As the glass is heated it becomes softer, and it is possible to use the glass’s “liquid” properties to bond glass surfaces permanently.

FUT

Fiber under test.

G

Green. Used when referring to color-coding of cables.

gamma

The coefficient used to scale bandwidth with fiber length.

gap loss

The loss that results when two axially aligned fibers are separated by an air gap. This loss is often most significant in reflectance. The light must launch from one medium to another (glass to air to glass) through the waveguide capabilities of the fiber.

Gbps

Gigabits per second.

GHz

See gigahertz.

Ambil disini:

• Full version Zip (3.328.407 byte terdiri atas PCMAV-CLN.exe, PCMAV-RTL.exe, PCMAV.vdb, daily.cvd ver. 7013 rilis 2 Mei 2008 18:23 GMT)
• PCMAV.vdb
• daily.cvd ver. 7013 rilis 2 Mei 2008 18:23 GMT
• main.cvd ver. 46 rilis pada 6 April 2008 18:57 GMT (klik kanan –> Save Link As… atau Save Target As…

Seperti biasa, gunakan WinZip 11 atau yang lebih baru untuk mengekstrak file.

Hal ini tentu saja merupakan sebuah kejutan karena beberapa hal. Pertama, Apple dan AT&T tidak memberikan subsidi untuk produk ponsel tersebut sejak hari pertama kelahirannya, melainkan fokus pada upaya mengeruk keuntungan sebesar-besarnya dari penjualan iPhone dan memprovokasi masyarakat agar tidak sayang uang untuk memiliki kemewahan. Mengetahui bahwa Apple mengklaim penjualan iPhone meledak di Amerika Serikat seperti yang diharapkan (penjualan di luar Amerika lain soal), pemotongan harga dengan skala besar merupakan hal yang tidak lumrah.

Sebelumnya Apple pernah menurunkan harga iPhone.

Jadi, apa yang sebenarnya sedang terjadi? Ada apa dengan Apple dengan iPhone-nya? Jika rumor penurunan harga ini benar, mungkin ini bukanlah salah satu strategi untuk mendongkrak penjualan. Faktanya, Saul Hansell dari New York Times mengemukakan dua skenario yang mungkin: Pertama, bahwa AT&T berencana untuk menaikkan harga pemakaian data tak terbatas yang dibundel dengan iPhone (Hansell mencatat $45 pemakain data untuk Blackberry selama sebulan dibandingkan hanya $20 untuk iPhone). Kedua, Apple mungkin berencana untuk melego iPhone tidak terkunci (unlocked) di negeri Paman Sam dengan harga tinggi.

Menurut hemat saya, Apple tidak akan menawarkan ponsel berwarna hitam yang unlocked ini dalam tahun ini, akan tetapi argumentasi Hansell mengenai kenaikan harga jasa komunikasi data sangatlah masuk akal. AT&T mungkin akan berusaha memikat pembeli dengan menawarkan berbagai fitur sehingga masyarakat akan tergiur untuk membeli. Satu dugaan: SMS tidak terbatas, dan kemungkinan panggilan telepon tak terbatas juga, akan menjadi satu paket dengan penjualan iPhone, sama seperti produsen ponsel lain yang sudah memulai memberikan penawaran serupa.

Kita akan segera mengetahuinya… musim panas sudah di ambang pintu, dan Mr. Steve Jobs sudah gatal untuk menggebrak pasar dunia.

Sumber: Yahoo Tech

The reflection of light from an optical discontinuity; it occurs at the air/glass interfaces at entrance and exit ends of an optical fiber.

Fresnel reflection method

A method for measuring the index profile of an optical fiber by measuring reflectance as a function of position on the end-face.

FTF

Fiber trunk feeder.

FTM

Fiber telecommunications module.

FTMB

Fiber to major business.

FTP

(1) Foil twisted-pair cable. See also screened twisted-pair (ScTP) cable. (2) Abbreviation for file transfer protocol.

FTTB

Fiber to the business.

FTTC

Fiber to the curb.

FTTD

Fiber to the desk.

FTTH

Fiber to the home.

Fiber-optic transmission system.

FOX

Fiber-optic extension.

frame check sequence (FCS)

A special field used to hold error correction data in Ethernet (IEEE 802.3) frames.

frame relay

A packet-switched, wide area networking (WAN) technology based on the public telephone infrastructure. Frame Relay is based on the older, analog, X.25 networking technologies.

frequency

The number of cycles per second at which a waveform alternates. Frequency is expressed in hertz (Hz); one hertz equals one cycle per second.

frequency division multiplexing (FDM)

A technique for combining many signals onto a single circuit by dividing the available transmission bandwidth by frequency into narrower bands; each band is used for a separate communication channel. FDM can be used with any and all of the sources created by wavelength division multiplexing (WDM).

frequency modulation (FM)

A method of adding information to a sine wave signal in which its frequency is varied to impose information on it. Information is sent by varying the frequency of an optical or electrical carrier. Other methods include amplitude modulation (AM) and phase modulation (PM).

frequency response

The range of frequencies over which a device operates as expected.

Fresnel diffraction pattern

The near-field diffraction pattern.

Fresnel loss

The loss at a joint due to a portion of the light being reflected.

Finite impulse response.

firestop

Material, device, or collection of parts installed in a cable pathway (such as a conduit or riser) at a fire-rated wall or floor to prevent passage of flame, smoke, or gases through the rated barrier.

FITL

See fiber-in-the-loop.

flex life

The average number of times a particular cable or type of cable can bend before breaking.

floating

A floating circuit is one that has no ground connection.

floor distributor (FD)

The ISO/IEC 11801 term for horizontal cross-connect. The floor distributor is used to connect between the horizontal cable and other cabling subsystems or equipment.

fluorinated ethylene-propylene (FEP)

A thermo-plastic with excellent dielectric properties that is often used as insulation in plenum-rated cables. FEP has good electrical-insulating properties and chemical and heat resistance and is an excellent alternative to PTFE (Teflon®). FEP is the most common material used for wire insulation in Category 5 and better cables that are rated for use in plenums.

FM

See frequency modulation.

FOIRL

See fiber-optic interrepeater link.

FOTP

See fiber-optic test procedures.