NUS.SOC.CS2105 Ooi Wei Tsang Application Transport Network Link Physical you are here
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NUS.SOC.CS2105Ooi Wei Tsang
Application
Transport
Network
Link
Physical
you are here
NUS.SOC.CS2105Ooi Wei Tsang
Physical node-to-node
bit-by-bit
Networkhost-to-host
Linknode-to-node
frame-by-frame
101101001000100101010
NUS.SOC.CS2105Ooi Wei Tsang
NUS.SoC.CS2105Ooi Wei Tsang
Framing
Possible Link Layer Services
NUS.SoC.CS2105Ooi Wei Tsang
SharedPoint-to-
Point
Possible Link Layer Services
NUS.SOC.CS2105Ooi Wei Tsang
NUS.SoC.CS2105Ooi Wei Tsang
Flow Control
Possible Link Layer Services
NUS.SoC.CS2105Ooi Wei Tsang
ReliableUnreliable
Possible Link Layer Services
NUS.SoC.CS2105Ooi Wei Tsang
Error Detection &
Recovery
Possible Link Layer Services
NUS.SoC.CS2105Ooi Wei Tsang
Link Layer Adapter
NUS.SoC.CS2105Ooi Wei Tsang
Ethernet
NUS.SoC.CS2105Ooi Wei Tsang
NUS.SoC.CS2105Ooi Wei Tsang
source and destination address
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MAC Address90:AF:F4:CA:BA:03
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type
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CRC
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CRCCyclic Redundancy Check
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d data bits r CRC bits
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d data bits r CRC bits
r+1 bits G = n x
NUS.SOC.CS2105Ooi Wei Tsang
d data bits r CRC bits
r+1 bits G = nx
NUS.SOC.CS2105Ooi Wei Tsang
NUS.SOC.CS2105Ooi Wei Tsang
d data bits r CRC bits
r+1 bits G = nx
D2r xor R = nG
NUS.SoC.CS2105Ooi Wei Tsang
CRC
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data
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preamble
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SharedPoint-to-
Point
Different Link Layer Services
NUS.SoC.CS2105Ooi Wei Tsang
Multiple Access
Protocols
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TDM, FDM
1. Channel Partitioning
NUS.SoC.CS2105Ooi Wei Tsang
2. Taking Turns
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Polling
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Token Passing
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3. Random Access
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Slotted ALOHA
NUS.SOC.CS2105Ooi Wei Tsang
NUS.SoC.CS2105Ooi Wei Tsang
ALOHA
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NUS.SoC.CS2105Ooi Wei Tsang
CSMA
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NUS.SoC.CS2105Ooi Wei Tsang
CSMA/CD
NUS.SOC.CS2105Ooi Wei Tsang
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