Does having a longer Ethernet cable slow your connection?
2016年8月17日 · Ethernet cables come in a few different varieties: cat 5, cat 5e and cat 6 are currently in (reasonably) wide use. Cat 5 doesn't officially support gigabit Ethernet, but with a short (e.g., 1 or 2 meter) cat 5 cable that's in good physical condition, you can often get a seemingly reliable gigabit connection anyway 1.
layer1 - Minimum Ethernet Cable Length? - Network Engineering …
2018年12月21日 · => There is no minimum cable length for twisted-pair Ethernet. If a device or a cable doesn't work with a very short link it can be considered broken. ("Copper" also includes ancient coax cabling which does have minimum spacing of 2.5 m (10BASE5, Clause 8.6.2.2) or 0.5 m (10BASE2, Clause 10.7.2.1) - but I don't think that was the question.
ethernet - When to choose fiber instead of twisted pair (copper ...
2013年5月24日 · While most other answers have talked about Length limits, Interference issues and are all correct. One important factor while choosing the cable is the speed of the network and the devices you plan to use. The general specifications for currently available ethernet network speeds are as follows. Twisted Pair Copper Cable Category 5e
ethernet - RJ45 Cable only has 4 wires - Network Engineering …
2018年12月19日 · There is a lot of crap cable sold, and many manufacturers have run into legal problems. You seem to have the pin numbers backward (1, 2, 3, and 6 are required for even 10 or 100 Mbps ethernet both straight-through and crossover). Those may be the only pins connected, but the other wires may be in the cable and cut off (not in the connector).
Ethernet cable used two ways - Network Engineering Stack Exchange
2015年8月18日 · However I would like not to do the same on the other side of cables. Hence I would like to have two 100Mbit connection, but the ethernet cable in the router from one connection will have nonsense on the unused wires. It is possible to split a single 8-wire UTP cable into two 100Mbps cables that only require 4-wires. But then both sides of the ...
What is the voltage used in ethernet lines (UTP Cables)?
So potentially you could have an offset of –45 mA and an AC current of ±45ma leading to a total max current of -90 mA. This drives into a 25 ohm load, so that works out to a maximum of around -2.5V, into a properly terminated cable. However the voltages may be higher if multiple stations transmit at the same time.
Confused about the results from the cable tester - network
There were days when installed 8-wire cable was used to provide two 8P8C connectors (a.k.a. "RJ45"), but equipped with just 4 wires each (1,2,3,6), to "save some money", and of course because 100Mbit/s Ethernet was a big thing back then and because it ran fine on just two twisted pairs. Saving money that way has a veeeeery long tail, as we now see.
Ethernet Cable Orientation - Network Engineering Stack Exchange
Twisted pair provided a cheaper way to install ethernet on older buildings that had already telephony equipment. Under such circunstance, you might use the two left-over pairs to transmit two telephone lines. They can - if done correctly - provide one more Fast-Ethernet connection (Yes, you can use a single cable to transmit two ethernet runs).
What's the difference between an Ethernet cable and a UTP cable?
Some distinctions and history: Ethernet and other networking systems can use a variety of physical media, including fiber optic and metallic wires. Since the wires are almost always made of copper, people usually speak of fiber vs. copper. The original 3 MBps Ethernet developed by Xerox in the 1970s used 50-Ohm RG-8/U coax cable.
Is the bandwidth of cable constrained by its length?
This depends on the technology, but most often: yes. For example, the popular 10base-T ethernet specification assumes a nominal maximum length of 100m. Longer than that your bandwidth will most likely drop (quickly to 0). Even with short enough cables other factors can diminish your throughput however, e.g. bad connectors.