Ada broadband..., ada wide band... Ada thinny band... On Fri, Nov 19, 2010 at 4:17 PM, S Roestam <[email protected]> wrote:
> Kawan2 Anggota Milis Yth, > > Ini sebuah pertanyaan yang sangat menarik, yaitu apakah sebenarnya definisi > dari "Broadband" itu? Masalahnya sudah sering kita mendengar berbagai > berita > yang hampir selalu menyebutkan perkemabangan broadband di Indonesia maupun > di dunia, tetapi definisi Broadband secara jelas masih belum ada, atau > banyak yang belum tahu. > > Berikut ini sebuah penjelasan yang lengkap beserta sejarah perkembangannya, > bagaimana istilah itu dimunculkan untuk mengukur kinerja jaringan layanan > telekomunikasi. > > *Technical Definition of Broadband: > > * Broadband refers to telecommunication that provides multiple channels of > data over a single communications *medium*, typically using some form of > frequency or wave division multiplexing. > > Broadband Mediums, Carrier Technologies, Speeds and > Applications > > > > Broadband access Technologies and > Definitions > > > > A study of broad band and expected growth of the > market.pdf > GET Adobe Acrobat > > *Broadband* access is a vehicle that allows the delivery of an entirely new > breed of media services and communications-oriented applications. In the > long run, it is these new services and applications that will differentiate > broadband from dial-up Internet access and give consumers a reason for > subscribing to broadband. Audio and video are the obvious cornerstones of > this coming high-speed revolution. Speedy connections coupled with > always-on > access will improve the consumer multimedia experience and change the types > of business models that are viable in the interactive marketplace. As use > of > broadband grows to more than 20 million subscribers by 2004, traditional > media companies may uncover opportunities for growth and acquisition in > these alternative content categories enabled by the high-speed Internet. > Broadband will not replace traditional media formats as they exist today. > But it will emerge as a new source of fragmentation, siphoning off enough > listeners and viewers to affect established media entities and their > long-term growth. > > Federal Full broadband lines are lines with information carrying capability > in excess of 200 Kbps in both directions, simultaneously. One-way broadband > lines are lines with information carrying capacity in excess of 200 Kbps in > one direction (typically downstream) and less than or equal to 200 Kbps in > the other direction (typically upstream). > > *Copper loop > technologies* > * * > ------------------------------ > > Dial-up modems > ------------------------------ > > ISDN > ------------------------------ > > xDSL > > *Cable TV access > technologies* > * via CatV > * > > *Wireless access* > ------------------------------ > > Analog cellular > ------------------------------ > > Digital cellular > ------------------------------ > > Wireless local loop (WLL) and other fixed wireless > > *Satellite* > > Broadband Access for *Consumers* is either through *DSL* (Digital > Subscriber Lines) or via *cable modem*. See attached FCC > Document > > *DSL* is a technology for bringing high-speed and high-bandwidth, which is > directly proportional to the amount of data transmitted or received per > unit > time, information to homes and small businesses over ordinary copper > telephone lines already installed in hundreds of millions of homes and > businesses worldwide. With *DSL*, consumers and businesses take advantage > of > having a dedicated, always-on connection to the Internet. > > > > There are currently at least six different types of *DSL*. They are > Asymmetric > Digital Subscriber Line (*ADSL*), Symmetric Digital Subscriber Line > (*SDSL*), > ISDN Digital Subscriber Line (*IDSL*), High-bit-rate Digital Subscriber > Line( > *HDSL*), Very high-bit-rate Digital Subscriber Line (*VDSL*), and > Rate-Adaptive > Digital Subscriber Line (*RADSL*). Each one has different technical ranges, > capabilities, and limitations. > > *Cable modems* *(CM)* are designed to operate over cable TV lines to > provide high-speed access to the Web or corporate Intranets. A power > splitter and a new cable are usually required. The splitter divides the > signal for the "old" installations and the new segment that connects the > cable modem. No television sets are accepted on the new string that goes to > the cable modem. > > There are three types of CM: *external modem*, *internal modem*, and > *interactive > set-top cable box*. A number of different cable modem configurations are > possible. Over time more systems will arrive. > > *Cable modem* services offer shared bandwidth between your and your > neighbors. Your speed will vary with how many people are on the cable modem > network, which may be a disadvantage. With *DSL* service, you have a > dedicated connection to your home. > > > > > > Kesimpulan dari penjelasan diatas, Broadband dapat disalurkan melalui > jaringan kabel, seperti DSL (ADSL), Coaxial, dan Serat Optik, serta melalui > jaringan Nirkabel (Wireless) yang bisa Fixed maupun Mobile, melalui > jaringan > terrestrial maupun satelit. > > Kecepatan transmisi Broadband sangat bervariasi, tergantung dari Teknologi > Carrier yang dipakai, dan medium fisik untuk penyalurannya, seperti Twisted > Pair, Kabel Coax, Serat Optik, dan Frekwensi Radio di udara bebas > (terrestrial dan satelit). > > Yang menjadi fokus pembicaraan kita adalah Kecepatan Broadband yang melalui > jaringan Nirkabel (Wireless). ITU mentapkan bahwa sebuah jaringan Wireless > bisa disebut sebagai Broadband Wireless bilamana kecepatan transmisi > puncaknya minimal adalah 384 kbps, sesuai dengan ketentuan dari UMTS > (Universal Mobile Telecommunication System). > > Mengapa dipakai ketentuan kecepatan transmisi puncak? Ini karena sifat > (nature) dari transmisi Wireless, khususnya Wireless Seluler yang banyak > dipakai di Indonesia, dimana kecepatan yang bisa dinikmati oleh pelanggan > tergantung apakah hanya satu orang pada saat itu yang sedang mamakainya, > atau ada banyak orang yg memakainya secara bersamaan. Bila hanya satu orang > yg memakai, maka kecepatan transmisinya adalah 384 kbps, dan turun secara > proporsional dengan bertambahnya jumkah pengguna pada saat yg bersamaan > (concurrent users). > > Sifat khusus lainnya dari Wireless Seluler adalah adanya perbedaan > kecepatan > transmisi untuk uplink dan downlink. Biasanya yang uplink kecepatan > transmisinya hanya 1/2 sampai 1/4 kecepatan puncak downlink. Ini karena > pertimbangan praktis, dimana umumnya para pengguna lebih banyak yang > menerima informasi dari atas/internet/server dari pada mengirim informasi > itu ke atas (uplink). > > Jadi jaringan Wireless Seluler yang sudah termasuk dalam klasifikasi > Broadband beserta kecepatan trnasmisi downlik/uplink-nya adalah sbb: > > > - GSM EDGE dengan kecepatan downlink/uplink 474 kbps/474 kbps (3G) > - GSM Evolved EDGE (1,89 Mbps/947 kbps) (3,25G) > - GSM HSDPA (3,6 Mbps/...) (3,5G) > - GSM HSUPA (7,2 Mbps/...) (3,75G) > - GSM HSPA (14,4 Mbps/5,76 Mbps) (3,8G) > - GSM HSPA+ Release 8 (42 Mbps/1,5 Mbps) (3,9G) > - CDMA 2000 1x EVDO Rev. A (3,1 Mbps/1,8 Mbps) (3,4G) > - CDMA 2000 1x EVDO Rev. B (14,7 Mbps/5,4 Mbps) (3,8G) > - Mobile WiMAX Release 1.0 (46 Mbps/4 Mbps) > - Mobile Wimax IEEE 802.16m > - LTE pada kanal 20 Mhz (328 Mbps/86 Mbps) (4.xG) > - LTE Advanced (1 Gbps/100 Mbps) (4,x G) > > Silahkan ditanggapi dan semoga bermanfaat. > > Wassalam, > S Roestam > http://wirelesstekno.blogspot.com > _______________________________________________ > Qbmember mailing list > [email protected] > http://leadershipqb.com/mailman/listinfo/qbmember_leadershipqb.com > > >
