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Topic: Collision domain


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In the News (Tue 23 Jul 19)

  
  Collision domain - Wikipedia, the free encyclopedia
A collision domain is a logical area in a computer network where data packets can "collide" with one another, in particular in the Ethernet networking protocol.
A collision domain can be a single segment sex Ethernet cable in shared-media Ethernet, or a single Ethernet hub in twisted-pair Ethernet, or even a whole network of hubs and repeaters.
Ethernet hubs, repeaters) forward all data that is sent on the media and therefore extend collision domains.
www.wikipedia.org /wiki/Collision+domain   (136 words)

  
 Hubs versus Switches: Understand the Tradeoffs
Collisions must be sensed by all stations on the network in order to discard the transmitted frame that has been corrupted and to notify all stations that bus arbitration is occurring.
Repeating hubs are considered part of the collision domain and for reliable operation of a shared Ethernet network, the network diameter must not exceed the collision domain (see Figure 1).
However, the collision domain rules for each link segment on a particular port must be followed since it is possible that repeating hubs are attached to switch ports.
www.automation.com /sitepages/pid1074.php   (2887 words)

  
 Transition Networks: White Papers   (Site not responding. Last check: 2007-10-21)
A collision domain is a group of Ethernet or Fast Ethernet devices that are directly connected by repeaters.
A collision occurs if DTE B begins transmitting before the signal from DTE A is heard by the CSMA/CD MAC of DTE B. If this is the case all DTE's in the collision domain will "hear" the collision and they send a collision signal onto the network.
The diameter of the collision domain is the distance between the two furthest nodes.
www.transition.com /TransitionNetworks/Learning/Whitepaper/Domains.aspx   (1496 words)

  
 Layer 2 Switching and Bridging
Recall from earlier in the series that a collision domain is simply a group of computers amongst which data collisions can occur.
Collisions are obviously a bad thing, since when they occur, systems much resend their data, which leads to less-than-optimal throughput.
The reason for the reduction is collisions when a bridge is implemented in due to the intelligent nature of a bridge.
www.networknewz.com /networknewz-10-20040504Layer2SwitchingandBridging.html   (1759 words)

  
 Networking hardware, Lesson 1: Hubs and repeaters   (Site not responding. Last check: 2007-10-21)
Broadcast Domain: A domain where every broadcast (a broadcast is a frame or data which is sent to every computer) is seen by all computers within the domain.
In a collision domain, when a collision occurs everyone in that domain/area will hear it and will be affected.
Collisions and the fact that only one computer can talk on the network at any given time along with the cabling rules are all part of the Ethernet rules.
searchnetworking.techtarget.com /tip/1,289483,sid7_gci958189,00.html   (1368 words)

  
 Ethernet, Fast Ethernet, Gigabit Ethernet   (Site not responding. Last check: 2007-10-21)
On a coaxial system, a collision is detected when the DC signal level on the cable is the same or greater than the combined signal level of the two transmitters, i.e..
The Collision Domain is made up of one segment of Ethernet coax (with or without repeaters) or a number of UTP shared hubs.
Jamming is a term used to describe the collisions reinforcement signal output by the hub/repeater to all ports.
www.rhyshaden.com /ethernet.htm   (13057 words)

  
 Garrett Communications - Path Delay Value (PDV) - Presented by Bomara Associates
A collision domain is a cluster of network devices connected together (without bridging) wherein a broadcast Ethernet packet travels to all of the nodes.
In any real installation, the most significant collision domain path is the longest path in terms of propagation delay since that is the path that is the limiting factor for that installation.
Since two Class II repeaters must be useable in a collision domain, and since only 190 BT of the delay budget is available for both of them, it can be seen that the PDV of a Class II repeater is 95 (i.e., half of 190) BT.
www.bomara.com /Garrett/pdvnote.html   (1108 words)

  
 network_devices   (Site not responding. Last check: 2007-10-21)
Collisions occur on Ethernet networks when two nodes on the 'network' start transmitting data at exactly the same time and the two frames collide.
They do not control broadcast or collision domains, they are not aware of upper-layer protocols and frame formats, they merely regenerate/amplify the signal.
If the collision LED flashes repeatedly or continuously, the NIC maybe be configured incorrectly or may be malfunctioning, or there may be other devices utilizing the network heavily.
www.networkingtutorials.net /network_devices_1.htm   (1431 words)

  
 iPMAC .JSC   (Site not responding. Last check: 2007-10-21)
If a transmitting node experiences a collision of a frame that has been cleared from its buffer (late collision), the transmitting node must use the processing power of the end-station to regenerate and retransmit the frame -- a process left to the upper layers, which results in a highly inefficient system.
The round-trip propagation delay in a collision domain must not exceed 512 bit times, which is a requirement for collision detection to work correctly.
The maximum size of a collision domain for Fast Ethernet is dependent upon the type of repeater(s) used to connect network segments.
www.ipmac.com.vn /content/view/80/55   (716 words)

  
 Glossary   (Site not responding. Last check: 2007-10-21)
Collision Domain - The portion of a network where host A can detect that host B is transmitting, therefore host A should wait.
Collision Domains are bounded by routers or switches.
Each device on the network is in its own collision domain and does not share bandwidth with other devices.
fwtf.berkeley.edu /fwtf_report/Glossary.htm   (1120 words)

  
 Collision domain -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-21)
A collision domain can be a single segment of Ethernet cable in shared-media Ethernet, or a single Ethernet hub in twisted-pair Ethernet, or even a whole network of hubs and repeaters.
Following the layers of the (Click link for more info and facts about OSI model) OSI model you can determine what devices extend or compound collision domains.
OSI Layer 1 Devices ((The central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes) hubs, ((electronics) electronic device that amplifies a signal before transmitting it again) repeaters) forward all data that is sent on the media and therefore extend collision domains.
www.absoluteastronomy.com /encyclopedia/c/co/collision_domain.htm   (174 words)

  
 Collisionless networking expands reach of Ethernet   (Site not responding. Last check: 2007-10-21)
This collision domain can be measured in bit times, the smallest packet of information for Ethernet, which is 64bytes or 512 bits (8 bits/byte x 64 bytes), must travel from transmitting node to the farthest end of the network without a collision being generated.
If a collision signal is generated it must have enough time for it to make it back to the transmitting node, informing it of the collision.
The collision domain and the type of media used are limiting factors to shared media networks.
www.unisysworld.com /monthly/2000/08/collision.shtml   (1327 words)

  
 Broadcast versus collision domains   (Site not responding. Last check: 2007-10-21)
Domains are an issue you are going to hear about, a term you are going to hear over and again in a number of different contexts.
In this context that we are talking about, a domain, a broadcast domain is the region that a broadcast on a network is heard.
This is what we call the broadcast domain, where the domain is the extent to which broadcasts are heard on the Internet or on the network.
learnlinux.tsf.org.za /courses/build/net-admin/ch03s07.html   (432 words)

  
 Fast Ethernet - Cabling   (Site not responding. Last check: 2007-10-21)
These collision domains are easily interconnected via switches, bridges, or routers t o form the enterprise wide LAN.
Each collision domain is allowed a maximum of two repeaters of Class II and one of Class I. The two types of repeaters are Class I and Class II.
This type of repeater connects identical media types to the same collision domain (that is because it can't translate from one media type to another).
www2.rad.com /networks/1996/fasteth/cabling1.htm   (508 words)

  
 SuperStack II Hub 100 UserGuide
A collision domain is defined as a length of cable with a switch, bridge, or router attached to one end of the cable and end nodes attached to the other end through a hub (or repeater).
In a single collision domain containing one Class II repeater using TX signaling, the maximum network diameter is 200 meters using Category 5 UTP cable, or 308.8 meters combining fiber-optic and UTP cable.
In a single collision domain containing a Class  I repeater using T4 signaling, the maximum network diameter is 200 meters using only Category 3, 4, or 5 UTP cable, or 231 meters with a combination of fiber-optic and UTP cable.
support.3com.com /infodeli/tools/hubs/suprstac/ss100/ssii100/chap3.htm   (2232 words)

  
 7.3 Collision Domain   (Site not responding. Last check: 2007-10-21)
An Ethernet system composed of a single segment or multiple segments linked with repeaters is a network that functions as a single collision domain.
In the next figure, the repeaters and DTEs are instead separated by a packet switch (switching hub, bridge, or router), and are therefore in separate collision domains, since packet switches do not forward collision signals from one segment to another.
As long as each collision domain is configured properly it will function correctly, and you can link many such networks together using packet switching hubs.
www.ethermanage.com /ethernet/10quickref/ch7qr_4.html   (308 words)

  
 Ethernet: The Definitive Guide: Chapter 13: Multi-Segment Configuration Guidelines
A collision domain is formally defined as a single Carrier Sense Multiple Access with Collision Detection (CSMA/CD) network in which there will be a collision if two computers attached to the system transmit at the same time.
The maximum collision domain diameter in a given Fast Ethernet system is the longest distance between any two stations (DTEs) in the collision domain.
The next row provides the maximum collision domain diameter when using a Class I repeater, including the case of all twisted-pair and fiber optic cables, or a network with a mix of twisted-pair and fiber cables.
www.oreilly.com /catalog/enettdg/chapter/ch13.html   (8938 words)

  
 Switches and Hubs — Upfront Systems
Microsegmentation is a term used to describe the segmentation of a collision domain into as many segments as there are circuits, minus one.
This way, collisions are decreased and only the two NICs which are directly connected via a point-to-point link are contending for the medium.
New Term: A collision domain is a logical area in a computer network where data packets can "collide" with one another, in particular in the Ethernet networking protocol.
www.upfrontsystems.co.za /Members/jean/cookbook/blog/switch-vs-hub   (331 words)

  
 Ethernet: What Engineers Need to Know   (Site not responding. Last check: 2007-10-21)
An Ethernet bus is one collision domain of limited length.
At 100 Mbps, however, this exceeds the collision domain; therefore, segment length is limited to 412 m.
The benefit of switch technology is that it terminates the collision domain at each of the switch ports.
www.hpac.com /microsites/networkedcontrols/thomas_0307.htm   (1677 words)

  
 Firewall.cx - The World's First Free Cisco Lab !
If you were to add a hub onto the port you would still have 1 collision domain at the port, but you may have 5 computers on that 1 collision domain.
Increasing the number of collision domains is not a problem, the size of a collision domain is what you care about.
If you have a 4 port hub, there is one collision domain, with a 4 port switch there is 4 collision domains (1 for each port).
www.firewall.cx /ftopict-496.html   (1120 words)

  
 Collision Domains
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You can avoid this potential disaster by picking a domain name that is free and clear from legal conflicts.
This site's domain name is lookupinfos.com - you can check this easily by looking at in the URL or location bar of your browser.
domains.lookupinfos.com /domains1/collision-domains.html   (419 words)

  
 Switching Your Way to Better Network Performance
Collisions are obviously a bad thing; when they occur, systems must resend their data, which leads to less-than-optimal throughput.
Consider the diagram below, in which the bridge breaks the network up into 3 collision domains.
Because of this, many people consider a switch to be a magic box, and in a way it is - there aren't many ways to squeeze dramatically better performance out of a network than by replacing hubs with switches.
www.networknewz.com /networknewz-10-20050111SwitchingYourWaytoBetterNetworkPerformance.html   (1742 words)

  
 Re: Collision domain & broadcast domain difference
Broadcast domain is the logical set of computers reachable without going through a router.
For most IP broadcasts, the broadcast domain is limited to the logical IP subnet.
Collision domain is at a lower layer, and refers to the set of devices that there could be a packet collision with.
www.mailarchive.ca /lists/comp.dcom.sys.cisco/2003-07/0403.html   (189 words)

  
 Encyclopedia: Collision domain   (Site not responding. Last check: 2007-10-21)
Jump to: navigation, search The Open Systems Interconnection Reference Model (OSI Model or OSI Reference Model for short) is a layered abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnect initiative.
Jump to: navigation, search A router is a computer networking device that forwards data packets across an internetwork toward their destinations, through a process known as routing.
A broadcast domain is a logical area in a computer network where any computer connected to the computer network can directly transmit to any other in the domain without having to go through a routing device.
www.nationmaster.com /encyclopedia/Collision-domain   (353 words)

  
 collision_domain   (Site not responding. Last check: 2007-10-21)
The multi-segment configuration guidelines apply only to a single Ethernet "collision domain." A collision domain is formally defined as a single CSMA/CD network in which there will be a collision if two computers attached to the system transmit at the same time.
Instead of propagating collision signals between Ethernet segments, packet switches interrupt the collision domain and allow the Ethernets they link to operate independently.
Therefore, the guidelines apply to a single collision domain only and have nothing to say about combining multiple Ethernets with packet switches.
www.tele.sunyit.edu /collision_domain.html   (290 words)

  
 14.2 Collision Domain   (Site not responding. Last check: 2007-10-21)
The scope of the multi-segment configuration guidelines is limited to a single Ethernet, or collision domain.
A collision domain is formally defined as a single CSMA/CD network in which there will be a collision if two computers attached to the system both transmit at the same time.
The repeaters and DTEs in Figure 14.2 are instead separated by a packet switch (switching hub, bridge, or router), and are therefore in separate collision domains, since packet switches do not forward collision signals from one segment to another.
www.ethermanage.com /ethernet/100quickref/ch14qr_3.html   (318 words)

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