CIS 304 - LAN Hardware/Wiring & Installation

Instructor: Michael P. Harris

Stripping & Terminating Coaxial Cable


We will be building a typical Coax cables (ARCnet and 10Base2 Ethernet) in our hands-on lab projects. Use the following short procedure as a guideline for stripping & terminating coaxial cables. Your Coax cables may be insulated and jacketed with PVC or with Teflon® (plenum).

 

From your LAN-Wire materials kit locate the:

  1. 6' length of RG-62/U coax cable (for ARCnet) or
    6' length of RG-58A/U coax cable (for 10Base2 Ethernet)

  2. (Qty. 2) RG-62/U BNC connectors (for ARCnet) or
    (Qty. 2) RG-58A/U BNC connectors (for 10Base2 Ethernet)


 

For best results, the universal tools and connector types listed below are recommended:

NOTE: Although other connector systems may be used, captive pin connectors assure positive retention of the center conductor. -- Twist-on BNC connectors should NEVER be used with ARCnet or 10Base2 Ethernet because they are rated at only 1MHz and are quite unreliable.



 

Fabrication Instructions:



1. CUT THE CABLE

Make a straight cut on the termination end of the coax cable.




2. INSERT COAX CABLE INTO STRIPPER

Set the Coax wire stripper (Two-step rotating stripper) to the RG-59 setting for ARCnet, (RG-59 & RG-62 are the same diameter) or the RG-58 setting for 10Base2 Ethernet. Adjust the stripper to meet the desired cable diameter and stripping requirements (usually with an hex allan wrench). For best results, the stripper should be adjusted to expose 1/4" of the conductor and 1/4" of the insulation. Insert the cable into the stripper.

NOTE: Rather than adjusting the stripper each time, it may be easier and faster to set and use different strippers for varying cable diameters.




3. ROTATE THE STRIPPER

The dual-set blades of the coax wire stripper will strip the end of the coax cable with a precise two-stage cut. Strip the ends of your coax cable using a rotary motion (three to five full turns) with the coax stripper. Always turn the stripper the same direction. Do not cut all the way through the jacket to avoid nicking the shield. Flex the jacket to complete seperating the jacket.




4. INSPECT THE STRIPPED CABLE

Pull the coax cable out of the stripper and inspect the cable for stripping quality. This inspection includes making sure that the center conductor and the insulation are not nicked or scored and that stray strands from the braid are pushed away from the conductor. You are now ready to crimp the center pin. NOTE: Do not use the stripper to pull the cut ends off the cable.




5. SEAT & CRIMP CENTER PIN ON CONDUCTOR

Seat the captive center pin of the BNC connector on the exposed conductor. Crimp the center pin to the end of the center conductor using the small diameter pin crimp die on the ratchet crimping tool. NOTE: Make sure that all of the strands of the center conductor are in the hole in the center pin before crimping.




6. INSERT SLEEVE FERRULE & BNC BODY ONTO CABLE

Slide the sleeve ferrule over the pin and exposed insulation. Place the BNC connector body on the cable end. Align the connector body so that its shaft fits over the pin and between the braid and insulation. This should spread the braid. Slip the connector body under the braided shield as far as it will go. Check for stray strands and push them out of the way.

NOTE: Make sure that the pin flange rests on the exposed insulation and the top of the pin is flush with the top of the BNC body.




7. CRIMP CONNECTOR ONTO CABLE

Slide up the crimp ferrule sleeve to cover the exposed braided shield up to the BNC body shoulder. Make sure that the ratcheting crimping tool is fitted with the proper hex die. Place the crimping tool over the ferrule sleve and squeeze the crimping tool to evenly and completely crimp the ferrule to the BNC body. Inspect for neatness and tightness of the termination. Pull & Flex firmly on the BNC connector to make sure it is crimped tightly to the cable




  • Repeat steps 1-7 for the other end of the cable.

  • TEST YOUR CABLE:
    1. Use a digital multimeter or cable testing tool to test your cable for shorts. Check from the center pin to the BNC connector body (any Ohm reading other than infinity)

    2. Using a BNC loop-back and digital multimeter or cable testing tool, test your cable for open conductor or open shield. (any Ohm reading other than zero)

    3. Using a BNC butt-splice and terminating resistor, test for a 93 Ohm reading for ARCnet (5%) or 50 Ohm (2%) reading for 10Base2 Ethernet.


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