Questions tagged [collision-detection]
8 questions
32
votes
3 answers
Maximum length of Ethernet over CAT5
As part of my course I’ve been reading the paper Ethernet: Distributed Packet Switching for Local Computer Networks. I understand that “classic” Ethernet (over coaxial cable) has a maximum length of 2500m while Ethernet over twisted pair has a…
user376151
4
votes
1 answer
Collisions in CSMA/CD Ethernet
I am confused about collisions in CSMA/CD Ethernet. When would a jam signal be sent? Why are jam signals sent? If two simultaneous packet transmissions interfere with each other, the two transmitting nodes can know that the voltage is oversized so…
Baran
- 315
1
vote
1 answer
how does a NIC actually detect a collision when using CSMA/CD?
I understand that a network card detects collisions because their signal has a higher amplitude than normal signals. But why is that signal of higher amplitude?
For example, say we have the simplest of cases, two computers communicating half-duplex…
Claudiu
- 645
1
vote
2 answers
Is a trunk switchport multiple collision domains for all its individual device switchports?
All devices on a switch belong to the same broadcast domain but each switchport is its own collision domain. As a result they operate in full duplex with no need to sense traffic.
Assume a simple non-managed switch...all devices on the one switch…
Willie
- 121
1
vote
1 answer
Why are there distance limitations on CSMA/CD?
I understand that one of the reasons is that ue to the effects of attenuation the collision detection mechanism is not effective beyond 2500 metres (1.5 miles). Segments cannot sense signals beyond that distance. They might, therefore, not be aware…
Rowana Ravenclaw
- 13
- 1
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0
votes
1 answer
High collision count on a specific switch port for security cameras
I am getting a lot of collisions reported from my switch on a specific port. The port in question is where our security camera DVR connects to our LAN. The port is set to auto-negotiate the speed. Is there anything I can do to reduce these…
Dr_Xunil
- 358
0
votes
1 answer
Maximum length for an ethernet cable
I was reading a similar question about cables here which claimed the max length you'd be able to use a CAT5 ethernet cable at would be 2.5km. Is there a rating of ethernet cable that would work well up to 5km? It looks as though fiber optic is used…
thansen0
- 111
0
votes
1 answer
Managing filenames collisions while merging folders (linux)
I'd need a sort of syncing sw to perform bidirectional (recursive) merging of folders.
Say I have 2 folders A and B.
Folder A contains files : 1, 3, 5 and 7.
Folder B contains files : 1, 2, 3 and 6.
After the execution of merging, the outcome…
