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Jaringan Komputer LanjutEthernet dan IEEE 802.3 LAN Standard
-Aurelio Rahmadian-
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Pemodelan Lapisan Jaringan
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Physical Layer
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Physical LayerMedia is the actual physical environment
through which data travels as it moves from one component to another, and it connects network devices. The most common types of net-work media are twisted-pair cable, coaxial cable, fiber-optic cable, and wireless. Each media type has specific capabilities and serves specific purposes.
Understanding the types of connections that can be used within a network provides a better understanding of how networks function in transmitting data from one point to another.
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Physical Layer
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Jenis-jenis Media
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Jenis-jenis Media
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Jenis-jenis Media
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Jenis-jenis Media
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Type Max Segment Length
Speed Cost Advantages Disadvantages
UTP 100 m 10 Mbps100 Mbps
Least expensive
Easy to install, widely available, widely used
Susceptible to interference; can cover only a limited distance
STP 100 m 10-100 Mbps
More expensive than UTP
Reduced crosstalk, less susceptible to EMI than UTP or Thinnet
Difficult to work with; can cover only a limited distance
Coaxial
500 meters (Thicknet)
185 meters (Thinnet)
10-100 Mbps
Relatively inexpensive but more costly than UTP
Less susceptible to EMI than other types of copper media
Difficult to work with (Thicknet); limited bandwidth; limited application (Thinnet); damage to cable can bring down entire network
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Type Max Segment Length
Speed Cost Advantages Disadvantages
FO 3 km and further (singlemode)
2 km and further (multimode)
10-1000 Mbps (singlemode)
100 Mbps-9.92 Gbps (multimode)
Expensive
Cannot be tapped easily; great distances; not susceptible to EMI; higher data rate
Difficult to terminate
Wireless
50 km - global
1-54 Mbps Expensive
Does not require installation of media
Susceptible to atmospheric conditions
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Ethernet
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Logical Link Control (LLC)Makes the connection with the
upper layers.Frames the Network layer packet.Identifies the Network layer
protocol.Remains relatively independent
of the physical equipment.Uses IEEE 802.2 standard.
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Media Access Control (MAC)Data Encapsulation: Includes frame
assembly before transmission, frame parsing upon reception of a frame, data link layer MAC addressing, and error detection.
Media Access Control: Because Ethernet is a shared media and all devices can transmit at any time, media access is controlled by a method called Carrier Sense Multiple Access with Collision Detection (CSMA/CD).
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Alasan Penggunaan EthernetSimplicity and ease of
maintenanceAbility to incorporate new
technologiesReliabilityLow cost of installation and
upgrade
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Sejarah Ethernet
Coaxial-10BASE5 (Thicknet)-10BASE2 (Thinnet)
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Sejarah Ethernet
UTP-10BASE-T-Half-duplex communication
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Sejarah Ethernet
UTP-100BASE-TX-Full-duplex communication
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Struktur Frame Ethernet
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Struktur Frame EthernetHeader
◦Preamble◦Start of Frame Delimiter◦Address◦Length
Data (Packet)Trailer
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Struktur Frame EthernetPreamble
◦ 7 octet of 10101010Start of Frame Delimiter
◦ 1 octet of 10101011Address
◦ Source MAC Address◦ Destination MAC Address
Length/EthertypeData (Packet-Segment-Data)Frame Check Sequence
◦ Cyclic Redundancy Check (CRC) Interframe Gap
◦ 12 octet of idle-line state
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MAC Address
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MAC Address