What is Cables: Definition and 172 Discussions

Networking cables are networking hardware used to connect one network device to other network devices or to connect two or more computers to share printers, scanners etc. Different types of network cables, such as coaxial cable, optical fiber cable, and twisted pair cables, are used depending on the network's physical layer, topology, and size. The devices can be separated by a few meters (e.g. via Ethernet) or nearly unlimited distances (e.g. via the interconnections of the Internet).
There are several technologies used for network connections. Patch cables are used for short distances in offices and wiring closets. Electrical connections using twisted pair or coaxial cable are used within a building. Optical fiber cable is used for long distances or for applications requiring high bandwidth or electrical isolation. Many installations use structured cabling practices to improve reliability and maintainability. In some home and industrial applications power lines are used as network cabling.

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  1. B

    Calculating Self-Inductance in Coaxial Cables

    Homework Statement A coaxial cable is made from concentric cylindrical conductors. The radius of the inner conductor is a and the outer comductor has inner radius b and outer radius d. Calculate the self inductance per unit length of the cable. You may assume that (b-a) >> a and (b-a) >>...
  2. H

    Standard for the distance between Elec. & Data connections / cables

    Hi Guys, I am trying to find out if there are any standards / regulations (world wide) for the distance between Electrical and Data cables and or connectors in electrical equipment. There is some info on medical equip. and cabling in buildings but nothing on the actual equipment. Its...
  3. M

    Dot products and angle between cables

    Homework Statement This is actually for an engineering class, but it's pretty basic vector addition. Determine the angle θ between the two cables attached to the post. I've attached the picture. Homework Equations The Attempt at a Solution From the picture: F1: α=? β=...
  4. I

    Why would high-voltage transmission cables disturb a car's radio reception?

    Homework Statement i was wondering why would high-voltage transmission cables disturb a car's radio reception with static?Homework Equations The Attempt at a Solution Could it be because of the frequency of the voltage? Or something in terms of frequency? Thanks :smile:
  5. K

    Radiating mode vs Coupled mode leaky cables

    I am trying to understand how leaky cables work, and especially those that permit higher frequencies (I think about 2.4GHz), but I am quite new to electromagnetics in general. For clarification, leaky cables are usually coaxial cables that have apertures in their outer conductor from where an...
  6. J

    HiWhat are these Wikileaks cables? Were these some paper/electronic

    Hi What are these Wikileaks cables? Were these some paper/electronic documents sold by someone to Wikileaks website? Or, is it that when cables were being sent they were tapped and sold later? Could't the 'leaker' be traced? Are these leaks only focused on the US diplomacy or the US diplomatic...
  7. T

    E&M question: power lost in cables

    Homework Statement First of all, sorry for my bad english. I have this problem and I've been trying to come up with something for 1h without success. A circuit is "given" 100kW (100 000W) The total resistance of the cables the electricity goes through is 5 ohms. The voltage difference...
  8. B

    Tensile fcorces, AHU suspended by 2 cables

    I have uploaded an image. I just need some one to help me start this problem. I cannot find any similar examples in my book. I have drawn an FBD. I feel like it has something to do with components but can't figure out where to start. Do I need to rearrange the forces in the FBD or...
  9. D

    Tension of 2 cables supporting one object

    Homework Statement A 1,000kg steel beam is supported by 2 ropes. What is the tension in each? Rope 1 on the left is -20 degrees from vertical and rope 2 on the right is 30 degrees from vertical, making a V shape, the tops being connected to a ceiling. Homework Equations Not sure...
  10. A

    How Do You Calculate the Tension in Cables Supporting a Suspended Loudspeaker?

    Homework Statement A 26.0 kg loudspeaker is suspended 1.9 m below the ceiling by two 3.0-m long cables that angle outward at equal angles. What is the tension (in N) in the cables? Assume that the local acceleration due to gravity is 9.80 m/s2. I'm not sure how to approach this problem...
  11. M

    Tension in the upper cables

    Homework Statement An abstract sculpture is constructed by suspending a sphere of polished rock along the vertical with four cables connected to a square wooden frame 1.7 m. If the stone has mass m = 5.2 kg, and the bottom two cables are under a tension of 25 N each, what is the tension in...
  12. I

    Two cables data transmission

    okay guys i have a small problem relating to network data transmission i have two cables cable 1 :- Bandwidth = B1 and SNR = S1 cable 2 :- Bandwidth = B2 and SNR = S2 Assume that B2 > B1 Cant i connect these two cables together and take advantage of lower SNR ratio requirements of...
  13. J

    Solve Crane Tension: 2 Cable Equations & Triangle Angles

    Homework Statement A crane is used to lift a concrete pipe weighing 5kN into place. Homework Equations The Attempt at a Solution The picture is in my book, but i am certain my problem is in my algebra(i have the layout correct) T_ac*cos(20)=T_ab*sin(3.58) X direction...
  14. T

    Calculating Loads of Cables Attached to Horizontal Bar

    Hi. I was trying to calculate a situation where you have a piece of cable that is attached to a horizontal bar and then the two ends of the cables goes up vertically and is attached. Now I pull in the part of the cable hanging down under the horizontal bar - but I don't pull in the center...
  15. M

    Calculate Tension in Cables Using Pythagorus Formula

    Well I've found the angles and got the hypotenuse by Pythagorus formula, but I'm kinda stuck i don't know what formula should i use to get the tension in cables. Hyp=23.3 m angles based on triangle AB we already have the 90 deg based on right angle triangle and the other angles are 31 and...
  16. M

    Safeguarding UTP Cables in Elevator Shafts: Filtering Options

    Hi, I am making a device with 8 INPUTs that will be connected to a long (5-25m) UTP cable running trough an elevator shaft (some interference, I imagine). Could you propose what kind of filters should I use on my inputs. The thing is, the HIGH level on these cables will be 12 to 19V but I need...
  17. P

    Can a Kinked Ethernet Cable Still Function Properly?

    Is it true that if you get a kink in an Ethernet cable (but without braking the wires), it will no longer work? Why is that? Is it related to the signal frequency? Or is it because of the material the cable is made out of ?
  18. E

    Uniform circular motion; two balls, two cables, and a post; no gravity

    Homework Statement In space in the absence of gravity, there is a post of "infinite mass," meaning that the post is fixed or "nailed down" and cannot move. A ball of mass m1 is connected to the post by a cable of negligible mass of length L1. A second ball of mass m2 is connected to the first...
  19. L

    Solve Underground Cable Reactive Power: 127MVAr

    Hello, I just got a small question. If a 50Hz grid line is carried underground for a distance of 10km. And it is also known that the capacitance is 400nF per phase per km. What is the total reactive power generated in the 10km length? Then I could say that we have a total of 400nF * 10 =...
  20. B

    Observation Deck Assignment - Tension in Cables

    Homework Statement For my engineering assignment we are working in a group to research, build, test, and write a report on an observation deck. The little fork in the road we've hit is determining the tension in the cables. There needs to be a moment produced once there is between 20 and...
  21. xunxine

    Power Loss in Cables: Is My Friend Correct?

    I found in a book the equation for the power loss caused by the heating effect of current in the transmission lines as below: Ploss = Iloss2R = (Pout/V)2R A friend of mine commented that the last bit "(Pout/V)2R" is unnecessary, confusing and wrong (but won't tell me why). Is my friend...
  22. F

    Why use 75 ohms on TV cables

    we learned it could be a trade off between loss and flexibility. Because if it was around 50 ohms or so it would be too thick of a wire. and the we learned the minimum loss is around about 77 ohms. What do you guys think.
  23. A

    Finding tension of support cables

    Homework Statement A 30 kg hanging mass is supported by three cables and is in static equilibrium. The tension in the center of the vertical cable is 126 N. A free body diagram is given with the one cable making an angle of 15 deg and another cable making an an angle of 40 deg. Determine the...
  24. matthyaouw

    What are these thingies on suspension bridge cables?

    Since I know there are a lot of engineer-types in these parts, maybe someone knows what these things are. Ther's a thing clamped high up on to the cable on the right, and every other cable on the bridge but I can't for the life of me work out what they are there for. any insight?
  25. G

    The Magnetic Field of Coaxial Cables

    Homework Statement A coaxial cable of length l, has a thin wall cylindrical inner conductor of radius a carrying current I. All current returns along the outer conductor whose inner radius is b. Assuming that the current flows only in a thin layer on each conductor, determine the magnitude...
  26. B

    Tension on two cables holding a weight

    Homework Statement A 18.0 kg spotlight is suspended 2.40m below a horizontal pole by two 3.90m long cables that angle upward at equal angles and reach from the top of the light to either end of the horizontal pole. Homework Equations The only equation I have for tension is...
  27. R

    Tension; 2 cables holding weight

    Homework Statement A small sphere of weight W is held as shown by two wires AB and CD. If wire AB is cut, determine the tension in the other wire (a) before AB is cut, (b) immediately after AB has been cut. (Ans: (a) TCD = 0.742 W; (b) TCD = 0.940 W)...
  28. Q

    Find the tension in two cables with a 68kg rescuer attached to them.

    Homework Statement In a rescue, the 68.0 kg police officer is suspended by TWO cables, as shown in the figure below. Theta1 = 35 degrees, Theta2 = 48 degrees Rescuer mass = 68 kg Homework Equations Find the Tension in cable 1 in N Find the Tension in cable 2 in N The...
  29. W

    Calculating Force on a Pin with Ropes and Tensions?

    Homework Statement A precast concrete wall is temporarily kept in its vertical position by ropes. Find the total force exerted on the pin at position A. The tensions in AB and AC are 420 lbs and 650 lbs. The Attempt at a Solution I'm not sure where to start, because I don't know...
  30. W

    Find the tensions in the cables of a weight

    Homework Statement To carry a 100-pound cylindrical weight, two workers lift on the ends of short ropes tied to an eyelet on the top center of the cylinder. One rope makes a 20 degree angle away from the vertical, and the other makes a 30 degree angle. (a) Find each rope's tension if the...
  31. M

    Find tension in angled cables holding steel plate

    Homework Statement I found that the steel plate weighs 23.1 kN from using the volume and density of steel. The length of L1=3.2m, L2= 3.9m. The angle on the left, theta, equals 94.4 degrees and alpha equals 54.9 degrees. I am just confused on how to find the tension in the cables. If someone...
  32. U

    Communication through cables and optical fibres.

    Hi, I'm in the first year of my engineering course and I've only completed the first four months of the course. As you can imagine,I don't have a very good grasp over my subjects yet,but I'm trying really hard! In our physics syllabus,we have a few things about communication through coaxial...
  33. N

    Calculating Surface Charge Densities in Concentric Cables

    Homework Statement 1. A portion of an infinitely long, concentric cable. The inner conductor carries a charge of 6 nC/m; the outer conductor is uncharged. The radius of the inner conductor is 1.5 cm, of the outer conductor is 6.5cm and of the inner surface of the outer conductor is 4.5 cm...
  34. A

    Work done by cables on railroad cars

    Homework Statement Two railroad cars, each of mass 1.6 104 kg, are connected by a cable to each other, and the car in front is connected by a cable to the engine as shown in the figure below. The cars start from rest and accelerate to a speed of 1.9 m/s after 1 min. (a) Find the work done...
  35. O

    Tension in cables pulling a box

    Homework Statement A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0o on either side of the vertical direction. What is the tension in each cable? Homework Equations Force = mass(acceleration) Weight = mass(gravity) The Attempt at a...
  36. S

    Boxes, cables, and girders (torque and equilibirum problem)

    Usually I'm pretty good with torque and such but this one had me. A box of mass 75 kg is put on a 10-m long steel beam of mass 150 kg and is connected to the wall and supported by a steel cable. The box is located 2.5 m from the wall and the cable makes 60o angle with the beam. What are the...
  37. G

    How Do You Calculate the Tension in a Chandelier's Cable?

    Homework Statement A chandelier with mass m is attached to the ceiling of a large concert hall by two cables. Because the ceiling is covered with intricate architectural decorations (not indicated in the figure, which uses a humbler depiction), the workers who hung the chandelier couldn't...
  38. M

    What Size Cable Do I Need for a 3 Phase Motor with a 34A Max Load Current?

    Hello, I am trying to work out what cable to supply a 3 phase motor with. I am using data from the manual that tells me: for 34A max load current use 6mm2 The drive output I am using has an Imax(cont) = 34A and an Imax = 52A. Is ir correct to use 6mm cable, i.e. should I be using the...
  39. R

    What Elements Are Best for Modeling Tensioned Cables in ANSYS?

    Hi, what sort of elements would you use on a tensioned cable, pinned at either end, that is to have a uniform load across it ? a single link8/10 element can't work because you can't put a UDL on it, only 2 nodes...Mulitple link elements won't work because there is no stiffness at each node...
  40. C

    How are lighthouses powered? using cables?

    how are lighthouses powered? using cables? could they be powered using wind or tidal energy? is it cost effective?
  41. R

    Short term ampacity in cables?

    Hi guys, I'm looking to find out if there is a ratio between short term and continuous current for power cables. I know that people usually generalize around 5-10 x rated ampacity, but I'm just asking around to see if there is a certain #. On McMaster Carr, the highest rated cable is for...
  42. M

    Quarter wave cables building

    Hii Iam new in this field, Please I want to build 1/4 wave cables and cross diodes together to stop high power at 90 MHz frequency for exaample, I want help how can I build some thing like this and what is the equations to choose the right length depending on the frequency...
  43. negitron

    Are High-End Audiophile Cables Worth the Investment?

    Yes. http://www.lastfactory.com/audiophile_cables/audiophile_cables.html .
  44. D

    Magnetic and electric field between current carrying coaxial cables

    Homework Statement Two long concentric, cylindrical conductors of radii a and b (a<b), are maintained with a potential difference V and carry equal but opposite currents I. An electron, with velocity u parallel to the axis, enters the evacuated region between the conductors and travels...
  45. N

    Finding Tension in Cables: How to Use Moments to Solve for Unknowns

    Homework Statement Obviously the picture is not to scale The Attempt at a Solution I really have no ides where to start I assume you have to use moments to find the tension in each cable but I am really not sure how to go at it. I think the 20 N force hanging from the sign...
  46. N

    Need help finding tension in cables

    Homework Statement Homework Equations The Attempt at a Solution I really have no ides where to start I assume you have to use moments to find the tension in each cable but I am really not sure how to go at it. I think the 20 N force hanging from the sign would only act through...
  47. X

    Solving Tension in Cables: 20 kg Speaker 2.5 m, 2 Cables 20°

    Homework Statement A 20 kg loudspeaker is suspended 2.5 m below the ceiling by two cables that are each 20 degrees from vertical. What is the tension the cables? Homework Equations The Attempt at a Solution I have no idea on what equation to use, considering we haven't even...
  48. T

    Heat exchanger consisting of Coaxial Cables

    Homework Statement A heat exchanger consists of two straight co-axial tubes, each of square cross-section. Liquid 1 enters at a rate m1 kg.s-1 at one end (x = 0) of the exchanger at temperature T10, and flows through the inner tube. Liquid 2 emerges at a rate m2 kg.s-1 at x = 0 at...
  49. C

    Finding Tension of 2 Cables

    In the drawing below, find the tension in cable one and in cable two. Ok so my teacher provided us with the answers, but she did not show us how to do it. Help? I am totally confused. BTW the answers are: 215.79 N and 263.16 N
  50. M

    Help with Force of Two Cables & Painter Tipping - Cleaver97

    Homework Statement Hi. I have a lab due today at 2:00 PM. I am having trouble with it. I have attached two photos containing my work done on the problem. The problem is I am unsure of how to move foward. If anyone can help me through AIM that would be best since I would be able to move...
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