What is Cable: Definition and 628 Discussions

A cable layer or cable ship is a deep-sea vessel designed and used to lay underwater cables for telecommunications, electric power transmission, military, or other purposes. Cable ships are distinguished by large cable sheaves for guiding cable over bow or stern or both. Bow sheaves, some very large, were characteristic of all cable ships in the past, but newer ships are tending toward having stern sheaves only, as seen in the photo of CS Cable Innovator at the Port of Astoria on this page. The names of cable ships are often preceded by "C.S." as in CS Long Lines.The first transatlantic telegraph cable was laid by cable layers in 1857–58. It briefly enabled telecommunication between Europe and North America before misuse resulted in failure of the line. In 1866 the SS Great Eastern successfully laid two transatlantic cables, securing future communication between the continents.

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  1. L

    Should a Shielded Cable Be Grounded at Both Ends for Optimal Performance?

    What is the correct way to terminate a shielded cable? Should it be connected to Earth ground at one end? What about the other end, leave it open? I was playing around with Radiated immunity tests -one end(close to EUT) of the cable was connected to Earth and other end was left open...
  2. L

    Tension of a cable as a result of a pulse (wave)?

    Homework Statement A ski gondola is connected to the top of a hill by a steel cable of length 620 m and diamter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 16 s for the pulse to return...
  3. H

    Light Traveling in both Directions in a fiber optic cable

    We have a spectrometer in our lab that collects light through a fiber optic cable, however it also sends a 532nm laser down this fiber optic cable. My background isn't in optics, and it would seem to me that the returning light (which is typically around 694 nm) would interfere with each...
  4. P

    Did I solve the hanging cable problem correctly?

    guys i got bored so i decided to try to solve the hanging cable problem - a cable suspended between two arbitrary points. i used the calculus of variations and the functional derivative to minimize the potential energy. i did get the catenary equation, y = a*cosh(x/a+b) + c . for some reason, it...
  5. D

    Transmission line and cable specifications

    Are the R,L,C specifications for a cable to be taken as the lumped circuit model paramters, or can I use the dimensions to actually calculate the cable's total R,L, and C? Say a cable has a specification of "capacitance = 10pF/m", then is it safe to say that if I have 10 meters of the cable...
  6. K

    Coaxial Cable ( Transmission line )

    How does current flow in a coaxial cable in each of the following cases : 1. When the cable is connected to a DC voltage source. 2. When the cable is connected to an AC voltage source 3. When the outer metallic shield is connected to ground and DC and Ac sources are connected separately I...
  7. Pengwuino

    Juryriggying a power cable connection thingy

    So do I has the craziest question evers! YAY ME. Anyhow, I have an old piece of video capture hardware, but the problem is I am missing the power plug thingamabobber :(. SADFACE. And by that, I mean... Now, I have a 5-12V adjustable power supply (cost me like $150 and only used it like...
  8. S

    Modeling coaxial cable impedance

    Hi, I am trying to model electrical equivalent of a coaxial cable. The data I have is 1. Conductor resistance 2. Insulator resistance 3. Partial discharge 4. Insulation Thickness 5. Overall diameter Actually I planned to use an equivalent circuit that has series connection of...
  9. M

    Using a magnet near audio cable

    I was wondering if there was a way of having a magnet near an audio cable without having any interferance maybe by using a sheild. My idea was to have a magnet to replace the 3.5mm audio jack in a headphone cable and port so that it would magnetically attach. Is this possible?
  10. J

    Calculating Reflection Coefficient in Coaxial Cable with Annular Sheet

    Homework Statement An annular sheet, of thickness t=1mm and resistivity ρ=0.5Ωm, connects the inner and outer conductors of an air spaced coaxial transmission line at a point on the line. A low-frequency signal is fed into one end of the line and the other is terminated by its characteristic...
  11. J

    Magnetic field at the centre of a cable that has an offset hole

    Homework Statement [From Electromagetism by I. S. Grant & W. R. Phillips, Q4.7] A cable of circular cross-section & diameter 0.2 m has a long cylindrical hole with a diameter of 0.001 m drilled in it parallel to the cable axis. The distance between the axis of the hole and cable axis is...
  12. W

    How may signals travel through a cable without interfernce?

    I am an Electrical Engineering.I want to ask that how different signals move in a cable without effecting each other..e.g interference etc.. I am not strictly speaking about it interfence but how at the end we can differentiate these signals and get one of our need.
  13. T

    Electric Flux Density for Coaxial Cable

    Homework Statement I am given the following problem: http://forum.allaboutcircuits.com/attachment.php?attachmentid=35938&d=1320027350 Homework Equations The Attempt at a Solution My known equations and attempt to the problem...
  14. G

    Cable breaking under its own weight?

    Homework Statement A scientist assembled large amount of cable. The longest piece of cable that is hung vertically and does not break under its own weight is of length k. He then places another piece of the cable on a friction-less table. A small part of the cable is hanging over one side and...
  15. T

    How do transformers affect power transmission in a circuit?

    Homework Statement As attached. Homework Equations - The Attempt at a Solution I think P is a step-up transformer while Q is a step-down transformer. Does the current and/or voltage change during XY? I know the answer is either B or C, but I do not the explanation. Can anyone...
  16. E

    What is the Electric Field Between Two Charged Surfaces?

    Homework Statement Hi, I'm having issues with a question about a coaxial cable. This is the question: A coaxial cable consists of a long straight cylindrical wire of radius R1, surrounded by a coaxial cylindrical shell of radius R2. For a situation where the inner cylinder carries...
  17. H

    EMC Radiated Susceptability of Cable - Antenna problem

    I am trying to calculate the voltage induced onto a shielded cable by a 200 V/m external electric field. I found an antenna equation that relates the power received to the incident electric field, but I need to define an antenna gain (G) for the cable. I am not sure how to get that. Am I on...
  18. A

    Do i need conuit for armored cable

    Hi, I am new to consulting business in India and wanted to know that if i use armored cable do i need to run it in conduit. I believe the whole reason of using armored cable is to avoid using any conduit. thnx for ur help.
  19. E

    Parabolic Cable Equations for Suspended Masses

    Homework Statement A cable of length L is supported at different elevations and is used to suspend two masses m1=10kg and m2=25kg at B and C respectively, as shown in Fig 2. The vertical heights of B and C relative to the support at A are denoted by h1 and h2 respectively. For simplicity...
  20. C

    Cable Tension Calculation Confirmation

    Homework Statement A system of cables is used to support a crate of mass m = 49 kg as shown in the figure below (θ = 57°). Find the tensions in all three cables. Homework Equations T2=mg T3sinθ=T2 T1=T3cosθ The Attempt at a Solution So I calculated everything to be...
  21. V

    Coaxial cable charge density

    Homework Statement I have attached the question as a pdf. Homework Equations I'm thinking that we take the line integral of voltage to get electric field. But I'm not sure how to proceed from here. Is the line integral from a to b? Also, how do I get the charge density having found...
  22. F

    Ansys 13.0 cable element LINK180

    Hi, I am trying to model a simple cable using Ansys 13.0. It seems like the best element to use is LINK180, because this element replaced previously available links from older program versions (such as LINK10 and LINK167). However, although the "help" says that the third real constant for this...
  23. A

    Pulley but the cable is at an angle?

    Homework Statement http://img813.imageshack.us/img813/594/75309500.png http://img813.imageshack.us/img813/7166/51848816.png I have to find acceleration to calculate how long it takes the heavier box to reach the end of the table. Homework Equations The Attempt at a Solution...
  24. V

    Space Elevator: Magnitized Cable for Supersonic Travel

    Everyone has heard of the space elevator using a cable(s) that attaches to a geosynchronus satellite. Now trying to lift things is always a very energy expensive process, since just making a payload weightless cost energy and you get zero velocity and travel. Also how fast could an elevator...
  25. S

    Finding a length of a cable, in static equilibrium

    Homework Statement Find H as a function of L and XHomework Equations http://imageshack.us/photo/my-images/28/project1questoin.png/ http://imageshack.us/photo/my-images/28/project1questoin.png/ The Attempt at a Solution my answer came out to a ridiculous solution and I am not really sure if it...
  26. jegues

    Flux out of a Cylindrical Cable

    Homework Statement A coaxial transmission line has an inner conducting cylinder of radius a and an outer conducting cylinder of radius c. Charge ql per unit length is uniformly distributed over the inner conductor and -ql over the outer. If dielectric \epsilon_{1} extends from r=a to r=b and...
  27. F

    Why Does Tighter Twisting in Twisted Pair Cable Increase Transmission Rate?

    Why is that in twisted pair cable, the tighter the twisting, the higher the supported transmission rate? Thankyou
  28. R

    How to calculate the voltage on a resistor at a power cable

    hallo everyone, i have here a simple problem that i cannot solve. This is the problem: A resistor of 46 Ω is connected to the end of a power cable. The voltage a the begin of the cable is 230 V. The length of the cable is 25 m The copper area is 1.0 mm2 The specific resistance of...
  29. A

    Cannot understand lan cable type

    i have dsl connection in my home the wire that is used to connect my pc with router is yellow colouerd lan cable now i have learned that straight wire lan cable is used to connect a router and pc but i connected two laptops using this cable without any switch and router and it workedBUT HOW? two...
  30. M

    Velocity in fiber optics cable

    Homework Statement I'm taking an introduction course in optics and I came across this exercise which I can't find how to solve: "Two light pulses with different wave lengths 500 and 600 nm is sent into a 1 km long fiber. n(610 nm) = 1.399, n(600 nm) = 1.400, n(510 nm) = 1.448, n(500) = 1.45...
  31. I

    Simple Vector Problem - Cable Tensions

    Homework Statement A 125 N traffic light is hanging from two flexible cables. The magnitude of the force that each cable applies to the 'eye ring' holding the lights is called the cable tension. Find the cable tensions if the light is in equilibrium. I have attached a scan from the...
  32. Y

    What should be the size of HT cable from Feeder line of 11 KV to

    what should be the size of HT cable from Feeder line of 11 KV to energise Transformer of 500 KVA through HT panel (SF6) Breaker. I am a layman.
  33. H

    Calculating Power & Temperature Loss from Cable

    Hi guys, I am trying to calculate the power and temperature lost from a cable. So I can do some crude thermodynamic calculations on heat transfer. I am assuming in this case that the object next to the cable is touching, and I am trying to calculate how much power and temperature is...
  34. A

    Radial resistance of coaxial cable

    One of the textbooks I've stumbled across states that the radial resistance of a coaxial cable ( current running from inner cylinder to outer cylinder via silicon in between) is given byR = [resistivity * natural log of (b/a)] / [2*pi()*(length of cable)] where b is the outer radii and a is the...
  35. C

    Strenght of Magnetic Field Produced by Coax Cable?

    Hello, could someone tell me what the strength would be of the magnetic field produced by a coaxial cable that is supplying high-speed internet? Could you put it into perspective, as in comparing it to the strength of a magnet field of something else, say a standard household 110v line...
  36. Femme_physics

    Solving Horizontal Beam & Cable System: F, W & T1, T2

    Homework Statement http://img864.imageshack.us/img864/8066/graspcc.jpg the uniform horizontal beam AC, is held at tip A by a circular joint, and at point B it's held by 2 cables, BD and BE, as described in the drawing. At tip C of the beam acts a vertical force, F: Given W = 1 [kN] F = 4...
  37. H

    Proper termination with 75Ohm cable

    Homework Statement A pulse generator is connected to an oscilloscope, as in the image. The pulse generator has an internal impedance of 50Ohm and the oscilloscope is set to 1MOhm. The cable between the devices has a characteristic impedance of 75Ohm. The pulse from the generator has an...
  38. L

    Equilibrium: Minimum Cable Length

    Homework Statement The above figure shows a uniform iron beam of mass 253 kg and length L = 3 m. The cable holding the beam in place can take a tension of 1300 N before it breaks. Use the Young's Modulus for steel to be 200e9 N/m2. (You may ignore the small mass of the cable in this...
  39. F

    Torque on a tightrope: a function of the cable?

    The documentary "Man on Wire" covers Philippe Petit's 1974 crossing between the WTC towers. The movie is available on DVD and on Netflix's streaming service. At 0:49:10, Petit describes the rigging his team planned for the walk: An image of the rigging can be found on the...
  40. S

    Solving Electric Field & Displacement Current in Coaxial Cable

    Homework Statement An alternating current I = I_0 \cos(\omega t) flows down a long straight wire and returns along a coaxial tube of radius a. By constructing an appropriate Amperian loop or otherwise, and assuming that the induced electric field E goes to zero as the distance from the...
  41. S

    Cable car and counterweight forces problem. (Tension)

    Homework Statement The 2060 kg cable car shown in the figure descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1890 kg counterweight up the other side of the hill. The rolling friction of both the cable car and the counterweight are...
  42. M

    AES cable used for Analogue Audio. Is this a bad thing to do?

    Hi All, This is my first post here and I wanted to ask a few questions of the community that have been widely discussed in my workplace regarding the differences between using 110 ohm cable and 600 ohm cable for microphone and line level signals. Q: Firstly, is it OK to use AES/EBU 110...
  43. E

    Cable Tensions & Forces Problem

    Homework Statement Consider the two cables suspending a leg with a cast in the drawing. If the leg and cast weight 150 N, and the angle of the ankle cable is 60 degrees above the horizontal, what are the cable tensions and the angle of the knee cable from the horizontal such that the leg is...
  44. MalachiK

    Multipath dispersion in fibre optic cable

    Homework Statement I saw this question on this forum and the answer given At first I thought that it was obvious why reducing the width of the fibre would reduce the multipath dispersion. But having tried the problem with maths, I'm not so sure. Can anyone tell me where my maths...
  45. D

    What is the relationship between heat loss and resistivity in a cable?

    Homework Statement http://img710.imageshack.us/i/2631001.jpg/ #29 Homework Equations p=I^2R P=IV The Attempt at a Solution well, the answer is D, but i don't see why the length matters? can anyone find out the equation for this problem? i thought it was B) cable B because it has...
  46. M

    Gaussian Surface, Coaxial Cable

    Homework Statement A long coaxial cable consists of an inner cylindrical conductor with radius a and an outer coaxial cylinder with inner radius b and outer radius c. The outer cylinder is mounted on insulating supports and has no net charge. The inner cylinder has a uniform positive charge per...
  47. 0

    Magnetic Forces in and around a coaxial cable

    Homework Statement So I'm doing a problem set and the question refers to a coaxial cable, I am told that the cable consists of an inner solid cable radius (R1), which is surrounded by a outer thin tube with radius (R2) , both have the same current though them but opposite direction. I have to...
  48. J

    Pulley Cable System (Conceptual)

    Homework Statement A window washer of mass M is sitting on a platform suspended by a system of cables and pulleys as shown . He is pulling on the cable with a force of magnitude F. The cables and pulleys are ideal (massless and frictionless), and the platform has negligible mass...
  49. W

    Maximum potential (coaxial cable)

    Homework Statement Given a coaxial cable with outer conductor of radius b, and inner conductor of radius a. Prove that maximum potential is obtained when a = b /e, e is base of natural log. Homework Equations gauss law, ...The Attempt at a Solution By using Gauss Law, for a < r < b, i have E =...
  50. B

    Help Joanne Solve Cable System Tension Issues

    I am trying to solve the tension in the cable system and I can not get to the answer. See attached file for question 4-4 and 4-6. I have no clue as to what to do with the 100 kg weight on the 4-4 problem. As for 4-6. I came up with 7 T at the p arrow, and when I multiply that to 3 for...
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