In CSMA/CD after detecting the collision, station immediately stops transmission by sending the __________.

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  1. Stop pattern
  2. Preamble pattern 
  3. Jam signal
  4. Block signal

Answer (Detailed Solution Below)

Option 3 : Jam signal
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The correct answer is Jam signal.

key-point-image Key Points
  • In CSMA/CD (Carrier Sense Multiple Access with Collision Detection), when a station detects a collision, it stops its transmission immediately and sends a Jam signal to inform other stations about the collision.
  • This Jam signal ensures that all other stations are aware that the data sent during the collision is corrupted and should be discarded.
  • After sending the Jam signal, the station waits for a random amount of time before attempting to retransmit the data to avoid further collisions.
  • This random delay is determined by the exponential backoff algorithm, which helps to minimize the chances of repeated collisions.
additional-information-image Additional Information
  • CSMA/CD is a network protocol used in Ethernet networks to control access to the shared medium.
  • The Jam signal is typically 32 bits long and helps to ensure that the collision is detected by all stations in the network.
  • CSMA/CD is primarily used in half-duplex Ethernet networks, where simultaneous transmission and reception of data are not possible.
  • In modern full-duplex Ethernet networks, CSMA/CD is not used since the devices can transmit and receive data simultaneously, eliminating collisions.
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