Howto build your E1<>RJ45 cable

We used a Cat-7 Ethernet cable to build our E1<>RJ45 cable to connect the BTS with the BSC.

Things you need:

• one Cat-7 Ethernet cable
• two twinax plugs (BR2)
• some heat shrink tube
• soldering-iron
• multimeter (optional)
• a sharp knife :)

Step-by-step guide

One:

Take your cable and cut off one of the RJ45 connectors. Now use a ruler and make a slice so you can strip around 15 cm from your cable.

Two:

Split the wires from your cable. We need pin 1 and 2 for RX (green white/green) and pin 4 and 5 for TX (blue white/blue), you can use a multimeter if you are not sure you got the correct wires. Cut off the other wires we do not need them (yet).

Three:

Sort your twinax plugs to make sure you build them in the right order. ;)
We used heat shrink tube to stabilize our cable around the plugs.

Four:

Now you can put everything on the first part of the cable and assemble it. Use a soldering-iron to fixate each of the two pins of the plug with your wires. You do not have to worry about the polarity inside the twinax plug.

Five:

Repeat step three and five to build the second plug.

Done.