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Monitor Tap Cable

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The monitor tap cable allows connection of the receivers of two E1/T1 Sangoma ports to be used as monitors. The pinout diagram below shows a E1/T1 crossover tap cable. Another option is to build a straight cable tap that can be used with either straight or crossover cables.

References:
Sangoma port pinout specifications.

Materials:
  • Quanity 4, segment of Cat5e or Cat3 cable.
  • Quantity 4, 8 position block connectors, aka RJ-45 connectors
  • Small tie-wrap
  • Cable splice insulation, for example
    • Heat shrink tubing
    • Tape
    • Silicone

Tools:
  • Wire cutters
  • Block connector crimp tool
  • Soldering pencil and solder



Procedure:
  1. Identify wires used for positions 1, 2, 4, 5 in the 8 position block connector. Ignore the crossover side of the cable if a crossover tap is being made.
  2. Label two cable segements as Terminals
  3. Label one segment as Tap_A
  4. Label one segment as Tap_B
  5. Create tap junction
    1. Bare the 1, 2, 4, 5 wires on the Terminal segments
    2. Bare the 1 and 2 wires on both of the Tap segments
    3. Twist the 1 wires together on the Terminal segements; this is the wire 1 junction; repeat for the 2, 4, and 5 wires
    4. For Tap_A
      1. Twist the 1 wire to the the wire 1 junction; solder
      2. Twist the 2 wire to the the wire 2 junction; solder
    5. For Tap_B
      1. Twist the 1 wire to the the wire 4 junction; solder
      2. Twist the 2 wire to the the wire 5 junction; solder
    6. Bundle the junction with a tie-wrap
  6. Install the 1, 2, 4, 5 wires in the corresponding pins on an 8 position block connector on one of the Terminal segments
  7. Attach 8 position block connector to remaining Terminal segment
    1. If straight cable, install the 1, 2, 4, 5 wires in the corresponding pins on an 8 position block connector
    2. If crossover cable,
      1. Install wire 1 to connector position 4
      2. Install wire 2 to connector position 5
      3. Install wire 4 to connector position 1
      4. Install wire 5 to connector position 2
  8. Attach 8 position connector to Tap_A
    1. Install wire 1 of to connector position 1
    2. Install wire 2 of to connector position 2
  9. Attach 8 position connector to Tap_B
    1. Install wire 1 of to connector position 2
    2. Install wire 2 of to connector position 2


Created by: mike last modification: Wednesday 03 of January, 2007 [20:56:54 UTC] by mike


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