Appendix II Procedures For Adding A New Stub To An Existing Data Link Cable: Procedure

1. Cut the backbone cable.
2. Measure back 2.0 inches (50.8 mm) on both sides of the cut and mark the cable jacket. Do the same for one end of the stub cable to be spliced into the backbone.
3. Remove the cable jacket and shield, being careful not to damage the underlying data wire insulation.
4. Strip all data wire insulation back 0.25 inch (6.3 mm). No conductor strands may be cut in the insulation stripping process. The three prepared cable ends should be similar to those shown in Fig 1:
  
  Fig 1: Measuring Back 2.0 Inches (50.8 MM) On Both Sides Of Cut And Mark Cable Jacket
1. Install one end of each crimp on the backbone data wires and drain wire as shown in Fig 2
  
  Fig 2: Installing One End Of Each Crimp On Backbone Data Wires
1. Slide the two pieces of adhesive-lined heat-shrinkable tubing over the crimps onto the data wires. Slide the larger piece of adhesive-lined heat-shrinkable tubing over the cable jacket as shown in Fig 3
Fig 3: Sliding Two Pieces Of Adhesive-Lined Heat-Shrinkable Tubing Over Crimps Onto Data Wires
1. Insert the wires from the other two cables (new stub and backbone) into the appropriate crimp, install the crimp, and solder. An alternative is to use a heat-shrinkable nylon crimp, installing the crimp and then heating to shrink the adhesive-lined tubing.
  NOTE: Be sure to maintain proper polarity (connecting the three yellow data wires together, the three green data wires together, and the three uninsulated drain wires together).
  
  The assembly should be similar to that shown in Fig 4:
  
  Fig 4: Inserting Wires From Other Cables (New Stub And Backbone) Into Appropriate Crimp
1. Center each piece of the adhesive-lined heat-shrinkable tubing over the two crimps as shown in Fig 5
  
  Fig 5: Center Each Piece Of Adhesive-Lined Heat-Shrinkable Tubing Over Two Crimps
2. Shrink the tubing in place, using a heat gun with reflector, and taking care not to damage the data wire insulation.
1. Wrap or locate the replacement shielding material from the single-cable side of the assembly to the other as shown in Fig 6 Secure the material at the ends with tape. Use a 50 percent overwrap with foil or metal mesh shield materials.
Fig 6: Securing Material At Ends With Tape

NOTE: Be sure that the replacement shield material is wrapped tightly enough to be in physical contact with the drain wire. Overlap the replacement shield onto the cable jacket by 0.25 inch (6.3 mm.)
1. Center the piece of adhesive-lined heat-shrink - able tubing over the shielded assembly. There should be approximately a 1-inch (25.4-mm) overlap between the tubing and the cable jacket for proper sealing.
2. Shrink the tubing, working from the center of the tubing toward the ends. Heat until the adhesive melts and flows. Adhesive should be visible at both ends of the tubing on the cable jacket. The final assembly should look similar to that shown in Fig 7
Fig 7: Installing Adhesive-Lined Heat-Shrinkable Tubing