Why collision occurs

In this discussion we will refer to the same network described in the discussion of early collisions, but with one modification: In this network, the network administrator has violated the maximum cable length meters for 10BASE5 thick ethernet, meters for 10BASE2 thin ethernet by either adding too many repeaters in between Stations A and B or by laying too much wire between them. The following is an outline of a late collision event caused by out of spec.

Station A, detecting that the wire has been idle for 9. Station A transmits bits of its frame. If the cabling were in spec and Station B began to transmit, causing a collision, even if Stations A and B were on the farthest ends of the wire from each other the collision would be detected by station A before it could transmit its th bit.

Stage 1. Station A continues to transmit bits, and meanwhile, down at the other end of the wire, just before the electrical signal reaches Station B, Station B detects idle wire for 9. Stage 2. A minute amount of time later, a collision occurs. Stage 3 Station B, being extremely close to the collision, detects it first and begins transmitting a 32 bit jam signal.

The collision begins to propagate down the wire towards Station A Stage 4 , followed by the 32 Bit Jam signal generated from Station B. But because the cabling was out of spec. For example, if two systems determine a line is idle and then transmit data at exactly the same time, a collision may occur.

This can be resolved by retransmitting the data after a random delay. The definition of Collision on this page is an original TechTerms. If you would like to reference this page or cite this definition, you can use the green citation links above. The goal of TechTerms. We strive for simplicity and accuracy with every definition we publish.

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You can unsubscribe or change your frequency setting at any time using the links available in each email. Please contact us. The network area where a collision may occur is called a collision domain. In this post, I am going to talk about the 10 computer networking concepts that every professional should master. I will also include links to the main articles of each concept. This theoretical model explains how networks behave within an orderly, seven-layered Skip to content Collision, in computer networking, is a condition that occurs when two or more computers on a network try to transmit signals at the same time.