Friday, July 18, 2008

How to Make a Network Cable


from wikiHow - The How to Manual That You Can Edit

The steps below are general Ethernet Category 5 (commonly known as Cat 5) cable construction guidelines. For our example, we will be making a Category 5e patch cable, but the same general method will work for making any category of network cables.

Steps


  1. Unroll the required length of network cable and add a little extra, just in case. If a boot is to be fitted, do so before stripping away the sleeve and ensure the boot faces the correct way.
  2. Carefully remove the outer jacket of the cable, exposing about 1 1/4" (30 mm) of the twisted pairs. Be careful when stripping the jacket as to not nick or cut the internal wiring. After removing the outer case, you will notice 8 wires twisted in 4 pairs. Each pair will have one wire of a certain color and another wire that is white with a colored stripe matching its partner (this wire is called a tracer). Sometimes a rip cord (white thread) is also present.
  3. Inspect the newly revealed wires for any cuts or scrapes that expose the copper wire inside. If you have breached the protective sheath of any wire, you will need to cut the entire segment of wires off and start over at step one. Exposed copper wire will lead to cross-talk, poor performance or no connectivity at all. It is important that the jacket for all network cables remains intact.
  4. Untwist the pairs so they will lay flat between your fingers. The white piece of thread can be cut off even with the jacket and disposed (see Warnings). For easier handling, cut the wires so that they are 3/4" (19 mm) long from the base of the jacket.
  5. Arrange the wires based on the wiring specifications you are following. There are two methods set by the TIA, 568A and 568B. Which one you use will depend on what is being connected. A straight-through cable is used to connect two different-layer devices (e.g. a hub and a PC). Two like devices normally require a cross-over cable. The difference between the two is that a straight-through cable has both ends wired identically, while a cross-over cable has one end wired 568A and the other end wired 568B.[1] For our demonstration in the following steps, we will use 568B, but the instructions can easily be adapted to 568A.
    • 568B - Put the wires in the following order, from left to right:
      • white orange
      • orange
      • white green
      • blue
      • white blue
      • green
      • white brown
      • brown

    • 568A - from left to right: white/green, green, white/orange, blue, white/blue, orange, white/brown, brown. You can also use the mnemonic 1-2-3-6/3-6-1-2 to remember which wires are switched.

  6. Press all the wires flat and parallel between your thumb and forefinger. Verify the colors have remained in the correct order. Cut the top of the wires even with one another so that they are 1/2" (12.5 mm) long from the base of the jacket, as the jacket needs to go into the 8P8C connector by about 1/8", meaning that you only have a 1/2" of room for the individual cables. Leaving more than 1/2" untwisted can jeopardize connectivity and quality. Ensure that the cut leaves the wires even and clean; failure to do so may cause the wire not to make contact inside the jack and could lead to wrongly guided cores inside the plug.
  7. Keep the wires flat and in order as you push them into the RJ-45 plug with the flat surface of the plug on top. The white/orange wire should be on the left if you're looking down at the jack. You can tell if all the wires made it into the jack and maintain their positions by looking head-on at the plug. You should be able to see a wire located in each hole, as seen at the bottom right. You may have to use a little effort to push the pairs firmly into the plug. The cabling jacket should also enter the rear of the jack about 1/4" (6 mm) to help secure the cable once the plug is crimped. You may need to stretch the sleeve to the proper length. Verify that the sequence is still correct before crimping.
  8. Place the wired plug into the crimping tool. Give the handle a firm squeeze. You should hear a ratcheting noise as you continue. Once you have completed the crimp, the handle will reset to the open position. To ensure all pins are set, some prefer to double-crimp by repeating this step.
  9. Repeat all of the above steps with the other end of the cable. The way you wire the other end (568A or 568B) will depend on whether you're making a straight-through, rollover, or cross-over cable (see Tips).
  10. Test the cable to ensure that it will function in the field. Mis-wired and incomplete network cables could lead to headaches down the road. In addition, with power-over-Ethernet (PoE) making its way into the market place, crossed wire pairs could lead to physical damage of computers or phone system equipment, making it even more crucial that the pairs are in the correct order. A simple cable tester can quickly verify that information for you. Should you not have a network cable tester on hand, simply test connectivity pin to pin.


Tips


  • A key point to remember in making Ethernet patch cords is that the "twists" in the individual pairs should remain entwined as long as possible until they reach the RJ-45 plug termination. The twisting of the pairs in the network cable is what helps to ensure good connectivity and keeps cross-talk interference to a minimum. Do not untwist the wires any more than you need to.
  • CAT5 and CAT5e are very similar cables, however CAT5e offers better quality especially on longer runs. If making a longer run, CAT5e is recommended, however CAT5 is still an option for small patch cables.
  • A good idea on long runs, especially those that you need to hang or snake around, is to crimp and test the cable before you run the cable. This is recommended especially to anyone who is first starting out crimping their own cables, as it ensures you are crimping the correct pin order now, rather than trying to trouble shoot later.


Warnings


  • The ripcords, if present, are usually quite strong, so do not attempt to break them. Cut them.
  • Unless you need to do a large amount of cabling work, it may be less frustrating and, due to the cost of tools, less expensive to purchase ready-made cables.
  • Fire Codes require a special type of cover over the wires if the cabling is to be installed in ceilings or other areas that are exposed to the building ventilation system. This is usually referred to as plenum-grade cable or simply "plenum cable", and does not release toxic fumes when burned. Plenum cabling is more costly, perhaps double that of ordinary cable, so only use where necessary. Riser cable is similar to plenum, but is for use in walls or wiring closets to connect floors. Riser may not replace plenum cable so be aware of what area you are laying your cable. If in doubt, use plenum as it has the strictest and safest ratings.
  • A cat5 cable can not exceed 100 meters, or 328 feet. It probably shouldn't go beyond 300 feet.
  • RJ-45 is the common term most individuals use for the connectors present in CAT5 cabling. The correct name of the connector is simply 8P8C, where as RJ-45 is the name of a very similar looking defunct connector used in telecommunication. Most people will understand RJ-45 as 8P8C, but be careful when purchasing out of a catalog or online where you can't visibly determine which you are purchasing.
  • Be aware of any shielding your cable may have. The most common type of cable is UTP (Unshielded Twisted Pair), but a number of shielding/foiling options exist for added protection against EMI. Be aware of what you are purchasing and what you need. In most environments, UTP will be fine.


Things You'll Need


  • Crimper - This is the most essential tool and critical to the cable making process. If you don't have a quality crimper, then your cable connections will be bad. Inferior crimpers will make it difficult and/or nearly impossible to achieve a tight connection between the wires. Many better quality crimpers also have a ratcheting controlled closure for precise crimping. Crimpers with a plastic body will be more likely to develop a sloppy hip joint and give consistently poor cramps; a metal crimper is much preferred, and very common.
  • Tester (Optional) - Although not necessary for making cables, having a good cable tester can prevent and solve cable wiring configuration and installation problems. Most testers consist of two boxes (transmitter and receiver) you plug your patch cable into. The transmitter box tests the cable by sending test pulses down each individual wire, lighting up LED lights on the receiver box. Most testers will show you a result of the pass. Why do you want to test cables? Even if they are slightly damaged, network cables will work, but cause packet loss and data corruption to your hardware.
  • RJ45 Connectors - Ensure your RJ45 connectors are designed for the type of cable you are using (solid/stranded), as they have different types of teeth for piercing between multiple strands or around a solid single strand. Note: if you ask in an electrical trades store for RJ45 connectors, you may be asked whether you want "solid", "stranded" or "flat". The "flat" choice relates to the old flat "silver satin" cables used in 10Base-T, and should not be used in new Ethernet deployments.
  • Bulk Cable - Bulk cable can be found at computer stores, electrical stores, and home centers. You can obtain Category 5, Category 5e, and Category 6 cable, depending on your needs. For lengths shorter than 50' use a stranded/braided cable. For lengths greater than 50' use a solid cable.
    • There are two types of wire (solid or stranded) and which one you choose should be based on where and how the patch cable is to be used. See warning above about PLENUM cable. Stranded wire is best for a workstation patch as it can tolerate flexing without cracking the conductors; however, the trade off is that they're more susceptible to moisture penetration.[2] Solid is best used in a wire closet or for a patch that will be moved very infrequently, as the conductor tends to crack if bent and/or flexed. Cracked conductor leads to "reflections" which make for chatter on the LAN connection, hampering speed and reliability.

  • Boots (optional but preferred). It saves the cable in the long run and improves the looks. A boot is a molded piece of plastic that protects the connector from snagging, if it is pulled through the wall or conduit. It also provides strain relief on the cable, making it harder for the connector to be pulled off.
  • Straight edge wire cutter. You may find serrated snips work very nicely. Use something that gives an easy square cut; avoid diagonal pliers for this reason. You will find that many quality crimpers have a straight edge cutter built in.
  • Fish Tape - Fish tape is either a metal or plastic spool of guide wire. Strong enough not to buckle and bend while being pushed around, but flexible enough to be pushed past corners and bends, fish tape is a vital tool for some cable runs. Recommended conditions include: conduit, within walls, along structural beams and girders, in ducting, plenums, and dropped ceilings, or any situation where it's not physically possible to drag the cable along with you.


Related wikiHows




Sources and Citations



  1. ↑ http://www.lanshack.com/make-cat5E.aspx

  2. ↑ http://www.bluemax.com/techtips/networking/Wiring_Tips/Wiring100TX/networkcableand_connectors.htm



Article provided by wikiHow, a collaborative writing project to build the world's largest, highest quality how-to manual. Please edit this article and find author credits at the original wikiHow article on How to Make a Network Cable. All content on wikiHow can be shared under a Creative Commons license.

Posted by at
Labels:
Subscribe to: Post Comments (Atom)