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.

View More On Wikipedia.org
Recent contents Top users
  1. N

    Solve Tension in Cables (T1, T2, θ3)

    Homework Statement In the figure below, the left-hand cable has a Tension T1 and makes an angle of 58° with the horizontal. The right-hand cable has a Tension T3 and makes an angle θ3 with the horizontal. A 97.6N weight is on the left and an 84N weight is on the right. The cable connecting the...
  2. K

    Two conducting cables - Gauss' Law

    Homework Statement The cross section of a long coaxial cable is shown in the figure, with radii as given. The linear charge density on the inner conductor is -80 nC/m and the linear charge density on the outer conductor is -10 nC/m. The inner and outer cylindrical surfaces are respectively...
  3. J

    How are fiber optic cables affected with time?

    Does anyone know of some good references regarding how fiber optics are effected while aging in the field? What determines the life span of a fiber installation? Specifically, what causes the signal quality to degrade, and how quickly does it degrade. (That is, how does the attenuation across...
  4. T

    Gauss's Law and Coaxial Cables

    The diagram I've attached shows a cross-section view of a very long straight metal cylinder of radius r1 within a coaxial hollow metal cylinder of inner radius r2 and outer radius r3. The inner cylinder has a positive charge per unit length λ, whereas the outer cylinder has negative charge per...
  5. T

    How Do You Calculate Tension in Unequally Lengthed Cables Lifting a Beam?

    Homework Statement A 5m long uniform beam AC with mass of 600kg is being lifted from the ring at B by two chains (AB, 3m long and CB, 4m long). Determine the tension in chain AB and CB when the beam is clear of the ground. Homework Equations The Attempt at a Solution I tried...
  6. A

    How can I see a cables from 55 miles away?

    I live on a hill at 700 feet and I can see the aircraft warning lights of Belmont TV transmitter at 1 100 feet which is 55 miles away with my naked eye. With a small pair of binoculars I can see the mast which is tubular steel. In the morning I can sometimes see the several sets of cables...
  7. P

    Statics problem: cats on a beam, tension of cables calculation

    Homework Statement A 30 kg neon sign is suspended by two cables, as shown. Three neighborhood cats (5.0 kg each) find the sign a comfortable place. Calculate the tension in each cable when the cats are in the positions shown...
  8. Y

    Determining Range of Values of P for Taut Cables

    Homework Statement Two cables are tied together at C and loaded as shown. Determine the range of values of P for which both cables remain taut. Homework Equations \Sigma F_x=0 \Sigma F_y=0The Attempt at a Solution \Sigma F_x=\frac{ 4 }{ 5 }*P-\frac{ 600 }{ 650 }*T_{AC}=0 \Sigma F_y=\frac{ 250...
  9. P

    Calculate the tension force of 3 supporting cables that hold a crate

    Homework Statement A 500 N crate is at position A = (45, 70, -115) in a standard xyz coordinate system. Three cables support the crate and have terminal points B, C, D, whose coordinates are (0, 70, 0), (-60, 0, 0), and (45, -65, 0). Calculate the tension force of EACH of the three cables...
  10. P

    Find charge field within coaxial cables

    Homework Statement two very long coaxial cylinders. Inner has radius a and is solid with charge per unit length of λ. Volume is also uniform but not defined by a parameter. Outer is hollow with inner radius b and outer radius c. Outer cylinder is a conductor with charge per unit length of -2λ...
  11. E

    Voltmeter in Series as self inductance of cables is significant

    Hello, I am using a lock-in amplifier to measure the AC voltage across a small sample of superconducting wire located in a cryostat. As the self-inductance and the capacitance of the wires used for the measurement are non-negligible, I have basically connected the lock-in amplifier in series...
  12. S

    What Causes Energy Loss in Cables?

    Hello, I am studying transformers now for the exam and I came across this question. It made a confusion in my mind. I took the photo of the question and put it into attachment. The answers B and C looks very similar to each other and in my humble opinion both of them are true. I would be...
  13. F

    Overhead Lines vs Power Cables - Question on Insulation

    Hello I have a very basic question. I'm studying power cable engineering right now and I've learned about the role of insulation in a cable to reduce dielectric losses and charging current losses, but I don't understand what this means exactly. Here are my questions.. 1. Is the insulation...
  14. G

    EE Training Course - Power Cables

    Hi All, I am working as an electrical engineer (graduate) for a UK company company in the engineering industry. Since year review is coming up, it would be good if I’d talk to the management about training. I want to get certified in design and development of HV MV LV power cables. Hence, I...
  15. D

    How Do You Calculate Cable Tension and Power in an Inclined Plane Scenario?

    Homework Statement What's the tension on each cable ? and the power required to overcome tension (?) Here's the diagram: http://en.wikipedia.org/wiki/File:Planincline-schema.JPG Homework Equations F=Vsin(theta) ( constant velocity ) = a= 0 Inclined (24.25 degrees) to the...
  16. trollcast

    Micro USB OTG Cable: Can I Use a Female-to-Female Adapter?

    I'm looking at getting one of these for my tablet but would a female to female USB adapter on the end of the USB lead that came with my tablet work the same? Thanks
  17. A

    Find Tension in Cables for 13 kg & 4 kg Signs

    Homework Statement The big sign below (see attached image) is 13 kg and the small sign is 4 kg. Find the tension in all 4 cables. Homework Equations Fnet= Fa +FbThe Attempt at a Solution ƩFx= T2cos38 - T1cos51=0 T2=T1cos51/cos38 ƩFy=T1sin51 + (T1cos51/cos38)sin38 - 127.4 -39.2 = 0 T1=131.303
  18. B

    Connection cables for microcontroller

    Hey, I'm looking for a robust connection to microcontroller pins, just wondering what everyone has found works best? Cheers
  19. DaTario

    Coaxial cables and displacement current

    Hi All, Consider a situation in which a coaxial cable have electric current i(t) = Imax * cos(w*t) flowing through its cilindrical inner cylindrical core (with radius a) and the inverse current flowing on its surface cover (with radius b). I would like to know if it is correct to say that...
  20. S

    2 people pulling on ropes or cables with a third person trying to equal out

    Homework Statement We have a person pulling on a string or rope in the negative y negative x quadrant (call it left) this person is called Wesson, they have a force of 300N at 30° Same situation but pulling the other way, positive y and positive x quadrant (call it right), this person is...
  21. P

    Find tension in cables with forces acting on them.

    Homework Statement LOOK AT ATTACHED IMAGE FOR DIAGRAM OF QUESTION Assuming the pulley at D to be frictionless, determine the force values in cable members AC and BC due to the 300 N weight force for the system depicted in Fig. 3. Homework Equations F=ma (or F=mg) Sin cos and tan...
  22. N

    Find the Tensions in the Cables

    Homework Statement Determine the tensions in cables AB, AC, and AD. Homework Equations The Attempt at a Solution I mad point A (0,0,0) B = (2.6, -4.2, 4.4) C = (-2.6, -1.6, 4.4) D = (0, 2.5, 4.4) Firstly I found the unit vectos of AB, AC and AD, which are as follows...
  23. A

    Object suspended by two cables, what are the tensions of each cable?

    Homework Statement Consider there is a 634 N weight held by two cables that meet at a point above the weight. The left cable with tension T sub 2 makes an angle of 46° to the horizontal. The right cable with tension T sub 1 makes an angle of 40° to the horizontal. a) What is the tension in...
  24. H

    Calculating the Tension in Cables for Elevator Movement

    a hevy piece of macinery(85kg) is being moved by elevator between floors in a building. Two identical small cranes are used. a cable connects each 'crane' to a mounting hook on the top of the piece of equipment. the cable from one crane is at an angle of 22degrees below the horizontal while the...
  25. P

    Solving a Force Problem with Three Cables and a Bracket

    Hi everyone, i came across this forum a while ago and have been lurking here for a while. Any ways, i have a simple problem but can't seem to find a solution to it the photo of the problem is the link just here http://i1053.photobucket.com/albums/s463/Popa911/1cc85138.jpg Homework...
  26. M

    Tension of cables of unequal length

    While doing some "what is the tension in cable" of hanging masses problems, I thought of the following scenario: a mass, uniform in density, is suspended by two cables of unequal length (See attachment) Assuming that the mass is uniform in density, would T1 be the same as T2? Intuitively, it...
  27. C

    Can USB Cables & Ports Survive Over-Standard Voltage/Current?

    would commodity usb cables and ports survive an over-standard voltage and current?? suppose we want to make an adapter to power a gadget that require more voltage and power than what is allowed by the USB standard. But, suppose we try to use off-the-shelf USB cable in the above-standard...
  28. Newtons Apple

    Punch Down Blocks (Telephony or Ethernet Cables)

    I hope this is the right area of this.. Guys, I need to know... what does a Punchdown block do? I see these in wiring closets, where the telephone or ethernet cable is flayed open, and the wires inside are stuck into the blades of the block. I'm studying for the Network+ exams, and they mention...
  29. T

    2 Parallel connected cables resistance.Going from Diamater (mm) to m^2?

    A load taking 18.2A is supplied by aluminum and copper cables connected in parallel. The lengths of the copper and aluminium cables are 78m and 64m respectively. The diameter of the aluminium 1.8mm and that of the copper 2.1mm . The resistivity abd copper is 0.018uOHMm (Ohm.meter) and 0.031uOHMm...
  30. C

    Differences between electric cables designed for High, medium and low voltage

    I am trying to find the differences between electric cables designed for High voltage, medium voltage and low voltage electric transport, but I am failing to find an answer. I was wondering if you could help me with this. I know that aluminum is almost always the metal of choice, thicker is...
  31. A

    Tension in Cables of Differing Angles

    Homework Statement α=30° β=45° m=10kg a=0 Tα=unknown Tβ=unknown THE ANSWERS SHOULD BE Ta=72N, Tβ=88N Homework Equations mg=10kg*9.8m/s2=98N ∑Fx=ma(x)=0 ∑Fy=ma(y)=0 A Free Body Diagram would show three forces: 98N facing downwards, Ta facing 30° up and to the left, and Tb...
  32. T

    Some basics of power loss and voltage drop in cables

    Hey everyone, I could do with a hand checking my understanding of calculating the current loss in cables just to make sure I am doing it right. First up, is power loss. From my understanding of ohms law and P=VI it is possible to calculate the power loss in cables by using the formula power...
  33. A

    Drilling Hole in Steel Tube for Go Kart Cables: Safe?

    I want to drill a 3/8" hole in one side (not through) of a steel tube, 1-3/16" OD 1/16" wall tube in order to run cables through it. The tube is my son's go kart frame so I want to make sure it is safe to drill a hole into it. I'd appreciate any comments.
  34. S

    Run 3 Monitors with a VGA Splitter and Cables

    I have a laptop and I want to run my laptop screen and two external monitors. Can I do this with just a vga splitter and cables?
  35. S

    Finding Tension is three cables attached to a particular mass?

    Homework Statement An object of mass m is suspended from a cable tied to two other cables, each fastened to a supporting beam, as shown below. The tensions in the three supporting cables are T1, T2, and T3. The diagram of the system is available via the link below...
  36. S

    Masses connected by cables - Tension in cables?

    Homework Statement A 4.98-kg block is placed on top of a 11.4-kg block that rests on a frictionless table. The coefficient of static friction between the two blocks is 0.500. What is the maximum horizontal force that can be applied before the 4.98-kg block begins to slip relative to the...
  37. A

    Armoured Cables: Tape vs Wire - Mechanical Properties

    Hello guys , i have a question related to cable mechanical properties you know power cables have armouring , which enhance the mechanical properties for the cable the question is : what is the difference between the Tape armour and wire armour i know the difference in how they look like...
  38. S

    Total Resistance of Transmission Cables

    Homework Statement A mining company use an electric pump with and operating voltage in the range 1.25kV - 1.5kV. There is only a 240 Vrms supply available. A transformer is used to step up the output voltage to 1.5 kVrms. The secondary winding of the transformer has 2000 turns of wire. The...
  39. D

    Three masses suspended by cables: Force Question: HELP PLEASE

    Homework Statement Three masses are suspended by cables as shown. Find the tension in each cable. Picture: Homework Equations W=mg The Attempt at a Solution T1: W= mg = 15 kg x (9.8 m/s^2) = 147 N T2: W= mg = 11kg x (9.8m/s^2) = 107.8...
  40. U

    Tension between two cables, not sure what to do.

    Homework Statement In treating spinal injuries, it is often necessary to provide some tension along the spinal column to stretch the backbone. One device for doing this is the Stryker frame, illustrated in part (a) of the figure. A weight is attached to the patient (sometimes around a neck...
  41. G

    Find tension with two cables at different angles

    Homework Statement A weight of 5000 N is suspended by two cables. The object is at rest. The first cable is horizontal and the second makes an angle of 143 ° with the first cable. Find the tension of the first cable. Homework Equations Erm...I know it's something with sin or cosin...
  42. S

    Why aren't speaker cables Coaxial?

    Just out of interest I was wondering and couldn't work out... Why are (even high-end) speaker cables not coaxial? We always use a coaxial cable in the lab to get rid of the noise on our measurements. I figure that 50/75 ohm standard coax would create an impedance mismatch with the typically...
  43. K

    Induced voltages in cables in trunking

    I was carrying out a insulation resistance test on a ring main circuit at the dist board in an industrial workshop. The majority of the wiring is single core pvc cables run in metallic trunking and conduit. The majority of circuits have no cpc as the trunking/conduit is being used. When I...
  44. C

    Pulses, cables and toroidal coils

    Hello. I just came to imagine a "thing" that I'm not able to understand correctly, so maybe you can help me. Imagine a high voltage source, and a circuit made of cable capable of handle high currents (with low resistivity) and a load with medium to high resistance (say 10 KOhm) Now you...
  45. E

    EMF, electrical signal and shielded cables

    Hi I have a practical problem/question: I need to wire 2 PLC-s for communications (RS485 signal) and I am planning to use shielded twisted pair cable (Cat5 FTP). The signal cables are quite short - approx. 6 m. One possible problem that could arise: between the 2 PLC-s, there is a...
  46. S

    Energy losses in cables: What is the ohmic loss?

    having 2 cables of 790 mm^2 cross sectional area and voltage of 450 kV. the maximum power is 700 MW and the length of cables 580 km. Assuming the resistivity of the conductor is 1.67microohmcm. then what is the ohmic lose? Thanks in advance
  47. J

    De-embedding cables using s4p files

    Hello everyone, I am working on de-embedding s4p files for different types of cables. I have an s2p file for the test fixture alone. The s4p files obviously includes the cable and the test fixture. Using Matlab, I was able to get the transfer function of the de-embedded cables by dividing...
  48. A

    Magnetic field in coaxial cables

    I think I solved this problem correctly, I just want to check because it's an interesting problem, and it's from a past exam. Homework Statement A coaxial cable consists of an inner solid conductor of radius r_1, and and outer conducting cylindrical shell of inner radius r_2 and outer...
  49. K

    Statics - Max Tension in Cables

    Please help PROBLEM Cable AB supports a load distributed uniformly along the horizontal as shown. The lowest portion of the cable is located at a distance a = 3.6m below support A, and support B is located a distance b = na above A. -> Determine the maximum tension in the cable as a function...
  50. D

    Tension in two cables with a mass

    Hey guys, I'm having trouble analyzing the picture created in this and answering it. I believe it forms a triangle with angles 37, 60, and 83? Are the x components for both sides the same? Are the y components of both sides the same? If anybody has step by step details on how this solve this...
Back
Top