Lecture #14: Local Area Networks ALOHA Ethernet Token Ring ...

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Bit-Map Bit Map Protocol �� Each contention period consists of exactly N slots. slots. �� If station 0 has a frame to send, it transmits a 1 bit during the zeroth slot. No other station is allowed to transmit during this slot. �� Regardless of what station 0 does, station 1 gets the opportunity to transmit a 1 during slot 1, but only if it has a frame queued. �� In general, station j may announce that it has a frame to send by inserting a 1 bit into slot j. �� After all N slots have passed by, each station has complete knowledge of which stations wish to transmit. At that point, they begin transmitting in numerical order (reservation ( reservation protocols) protocols 24
The basic bit-map bit map protocol Since everyone agrees on who goes next, there will never be any collisions. 25
Page 1 and 2: Lecture #14: Local Area Networks AL
Page 3 and 4: The Channel Allocation Problem �
Page 5 and 6: Dynamic Channel Allocation in LANs
Page 7 and 8: �� ALOHA ALOHA ALOHA - a ground
Page 9 and 10: Pure ALOHA (2) Frames are transmitt
Page 11 and 12: Slotted ALOHA �� The method: Di
Page 13 and 14: Carrier Sense Multiple Access Proto
Page 15 and 16: CSMA types: persistent and nonpersi
Page 17 and 18: CSMA types: persistent and nonpersi
Page 19 and 20: CSMA with Collision Detection (CSMA
Page 21 and 22: CSMA / CD details �� After a st
Page 23: Collision-Free Collision Free Proto
Page 27 and 28: Ethernet �� IEEE has standardiz
Page 29 and 30: Three kinds of Ethernet cabling 10B
Page 31 and 32: Manchester encoding 31
Page 33 and 34: Ethernet frame format ��Preambl
Page 35 and 36: Ethernet Performance at 10 Mbps wit
Page 37 and 38: Token Ring - IEEE 802.5 �� A ri
Page 39 and 40: Token Ring frame formats Data or co
Page 41 and 42: Active and Standby monitors ��

Lecture #14: Local Area Networks ALOHA Ethernet Token Ring ...

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