Asynchronous Transfer Module
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Transcript of Asynchronous Transfer Module
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ATM (Asynchronous Transfer Mode)
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Outline
Deskripsi Aristektur Protokol Koneksi Logik ATM Format Cell ATM Adaptation Layer Layanan ATM Kelebihan & Kekurangan ATM
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Deskripsi [1]
Transmisi data fixed-length packet: “Cell” Connention-oriented Bekerja pada 10 – 100 Mbps Teknologi Switching:
Fixed BitRate Variable BitRate
Circuit ATM Frame Packet
Switching Relay Switching
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Deskripsi [2]
53 byte packet/cell A transfer mode in which the information is
organized into cells; it is asynchronous in the sense that the recurrence of cells containing information from a particular user is not necessarily periodic(from CCITT Recommendation I.113, Section 2.2)
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Aristektur Protokol [1]
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Aristektur Protokol [2]
Physical: Media transmisi ATM: Short fixed-length cells (53 bytes)
Manajemen trafik
Multiplexing ATM Adaptation: Tipe 1: BR Konstan
Tipe 2: BR Variabel Tipe ¾: Connectionless
Tipe 5: HighSpeed Data
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Koneksi Logik ATM
VCC (Virtual Channel Connection)?
+ Arsitektur jaringan sederhana
+ Kehandalan kerja meningkat
+ Waktu set-up koneksi singkat
+ Layanan jaringan yang tinggiJalur virtual Jalur transmisi fisik
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VPC: Virtual Path Connection
y n
y
n
y
n
Set-up VCCSet-up VCC
Sudah ada VPC?Sudah ada VPC? QoS dipenuhi?QoS dipenuhi?
Request dipenuhi?Request dipenuhi?
Membentuk VPC baruMembentuk VPC baruBlocking VPC/
Tambah kapasitas?Blocking VPC/
Tambah kapasitas?
Set-up VCC ditolakSet-up VCC ditolak
Set-up VCC dimulaiSet-up VCC dimulai
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Format Cell
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NNI = Network Network (NN) InterfaceUNI = User Network (UN)Interface
GFC = Generic Flow Control Manajemen trafik a/ tidak terjadi overload pada jaringan
VPI = Virtual path Identifier Menandai jalur virtual (VP)
ATM Network
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ATM Adaptation Layer
AAL Tipe 1: Bit Rate Konstan
AAL Tipe 2 : Bit Rate Variabel
AAL Tipe ¾: Connectionless
AAL Tipe 5: HighSpeed Data
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AAL [1] 47 byte/cell
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AAL [2] 45 byte/cell
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AAL [¾] 44 byte/cell
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AAL [5] 48 byte/cell
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Layanan ATM
Layanan Real Time: Constant Bit Rate (CBR) real time-Variable Bit Rate (rt-VBR)
Layanan Non Real Time: Available Bit rate (ABR) Unspecified Bit rate (UBR) non real time-Variable Bit Rate (nrt-VBR)
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Constant Bit Rate (CBR)
Transmisi audio dan video: Video Conference Audio Interaktif (mis. telepon) Distribusi Audio-Video (mis. TV) Searching Audio-Video (mis. Request music,
video clip, dll)
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real time-Variable Bit Rate (rt-VBR)
Jaringan mampu menggandakan jumlah koneksi pada kapasitas yang sama lebih fleksibel
Pencuplikan video menjadi frame-frame image dengan ukuran yang berbeda
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Available Bit rate (ABR)
Menggunakan cell rate tertentu: max[Peak Cell Rate (PCR)] min[Minimum Cell Rate (MCR)]
Aplikasi: Interkoneksi LAN, dalam hal ini ujung sistem
yang terpasang pada jaringan ATM: Router
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Unspecified Bit rate (UBR)
Mengapa UBR?
1. Untuk meningkatkan kapasitas jaringan saat trafik berlebihan
2. Tidak seluruh kapasitas yang ada dipergunakan untuk trafik audio dan video
Aplikasi: Transfer data text dan image
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non real time-Variable Bit Rate (nrt-VBR)
Transfer data yang memenuhi persyaratan waktu respon:
Pemesanan tiket pesawat Transaksi banking Monitoring process, dll.
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Kelebihan & Kekurangan ATM [1]
Kelebihan: Alokasi bandwidth yang fleksibel QoS Connection-oriented simple routing Multiplexing Penggunaan bandwith lebih
effisien
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Kelebihan & Kekurangan ATM [2]
Kekurangan: Overhead cell header 5 byte Untuk mencapai QoS diperlukan
mekanisme multiplexing yang sangat rumit Congestion Kemungkinan cell hilang