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Published byLandon Downton Modified over 10 years ago
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Data communication คุณลักษณะ 3 อย่างที่มีผลต่อการสื่อสารข้อมูล 1.Delivery 2. Accuracy 3. Timeliness (Real time transmission)
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Components Massage Step 1: Step 2: Step 3: ……… Step 1: Step 2: Step 3: ……… Protocol SenderReceiver Medium
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Components 1.Massage - text- number - pictures - sound - Video 2. Sender - a computer- workstation - telephone handset - video camera 3. Receiver - a computer- workstation - telephone handset - television
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4. Medium - twisted pair wire- coaxial cable - fiberoptic cable- laser - radio wave or satellite microwave 5. Protocol Components
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Basic Concepts Line configuration Topology Transmission mode Categories of networks Internetworks
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1. Line configuration Line configuration MultipointPoint-to-point Two categories of line configuration
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Link Workstation Mainframe Point-to-point
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Multipoint Link
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2. Topology Topology StarMeshTreeBusRing
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Mesh
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ตัวอย่าง กรณีที่มีเครื่องคอมพิวเตอร์ 8 เครื่องต้องการเชื่อมต่อกันในรูปแบบ Mesh ให้คำนวณหา Number of link และ Number of point per Device Solution Number of link = n(n-1)/2 = 8(8-1)/2 = 28 Number of point per Device = n-1 = 8-1=7
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Star Hub
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Tree Hub
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Bus Drop line Drop line Drop line Drop line Tap Cable end
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Ring
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Hybrid Topologies Hub Bus Ring Star
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3. Transmission Mode Transmission Mode Full-duplexSimplexHalf-duplex
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Simplex Mainframe Monitor Direction of data
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Half -duplex Workstation Direction of data at time 1 Direction of data at time 2 Workstation
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Full-duplex Workstation Direction of data all the time Workstation
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4. Categories of network Local Area Network (LANs) Metropolitan Area Network (MANs) Wide Area Network (WANs)
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Local Area Network (LAN) Single building LAN
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Local Area Network (LAN) Backbone Multiple building LAN
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Metropolitan Area Network (MAN) Public city network
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Wide Area Network (WAN)
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5. Internetworks WAN LAN MAN R R R R R R RR
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