LECTURE 13 CT1303 LAN. DYNAMIC MAC PROTOCOL: CONTENTION PROTOCOL CSMA\CA Carrier Sense Multiple Access\Collision Avoidance CSMA\CA Each station will sense.

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Presentation transcript:

LECTURE 13 CT1303 LAN

DYNAMIC MAC PROTOCOL: CONTENTION PROTOCOL CSMA\CA Carrier Sense Multiple Access\Collision Avoidance CSMA\CA Each station will sense the channel and inform all the rest station in the network that it will start transmitting data over the channel. In this protocol the collision may occur between Request To Send RTS frames or Confirm to Send CTS frames. Collisions don’t occur between data frames.

DYNAMIC MAC PROTOCOL: CONTENTION PROTOCOL CSMA\CA Advantages: Collisions do NOT occur between data frames. Transmission on demand only. Channel utilization is efficient when request and confirm to send done successfully. Used mostly and better for Wireless networks. Disadvantages: Unlimited waste of time (waiting) if nodes connected are large. Used in Wireless LANs and Apple Talk for apple devices.

CONTENTION PROTOCOL ADVANTAGES AND DISADVANTAGES: Contention protocol advantages and disadvantages: Advantages: Transmission on demand. Better used for discontinuous transmission of signal and data (computer networks in general) Better used in networks with light traffic. Disadvantages: Large number of connected nodes results in not utilizing the channel effectively. Wasted time (waiting) Sensing channels becomes difficult in large and long network channels

DYNAMIC MAC PROTOCOL: RESERVATION PROTOCOLS: To better channel utilizing and eliminate attenuation may occur in network channels due to collisions; Distributed Queue Dual Bus (DQDB): This protocol is intended to be used on a dual-bus configuration ( unidirectional) fiber optic networks. Two buses, each one in one direction, and each node is connected to the two buses. Centralized unit for each bus to control transmission.

DYNAMIC MAC PROTOCOL: RESERVATION PROTOCOLS: DQDB

Each centralized unit will send empty frames to the channel, which can be used by connected nodes to transmit data. Each frame has 2 flags ; one to identify whether the frame is empty and ready for used or has been reserved by another node. The other flag identifies if there is a Reservation request of frames on the other channel (bus). This protocol needed 2 counters in each connected node, that determine the number previous reservations for each channel, the counters will be incremented each time a frame with reservation flag on passes the connected node.

DYNAMIC MAC PROTOCOL: RESERVATION PROTOCOLS: DQDB When a node wants to send data to another node: Chooses which channel will be used. Turn on the reservation flag on a frame on the other channel. The node will then use one of the empty frames with its data. This protocol is used in Ring networks, LAN and MAN networks.

DYNAMIC MAC PROTOCOL: RESERVATION PROTOCOLS: DQDB Advantages: Transmission guaranteed. Limit delay time. Channel utilization %100 Disadvantages: Number of software needed for each connected node to control and determine the location of the node in the network. The need for cartelized unit to control frames. If the cartelized unit stopped, the protocol is stopped.