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laforge, 02/21/2016 11:04 AM
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 and pin 4 and 5 for TX, Use a Multimeter to determine the correct pairs. 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.
Image(IMG_0960-9.JPG, 15%) Image(IMG_0960-11.JPG, 15%)
Image(IMG_0960-12.JPG, 15%) Image(IMG_0960-17.JPG, 15%)
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 four to build the second plug.
Done.
Detailed pinout¶
A detailed pinout for your reference:
Signals on the RJ45 plug: ++++++++++ / / / /| / / / / | / /+++++++_/ / | / ++++++++ / | / / / / / / / / / / / | / / / / / / / / / / / / / /_/_/_/_/_/_/_/_/ / / | | | | | | | | | | | / | |8|7|6|5|4|3|2|1| | / | |_|_|_|_|_|_|_|_| | / |+++++++++_|/ | |/ \+++/ 1 = RX1 2 = RX2 3 = NC 4 = TX1 5 = TX2 6 = NC 7 = NC 8 = NC Signals on the twinax plugs: E1 Transmitter: +_ .-_ '@-. .' @. / 1 2 \ : ## ## ; | ## ## | : ; \ ############# / @. ######### .' @-.++_.-' 1 = TX1 2 = TX2 E1 Receiver: +_ .-_ '@-. .' @. / 1 2 \ : ## ## ; | ## ## | : ; \ ############# / @. ######### .' @-.++_.-' 1 = RX1 2 = RX2 Note: The drawings are showing the plugs point of view. Note: This is a differential connection with symetric signals so you do not have to care about the polarity. Cable connection on the BS11: ---~++++_--- / 12 \ \ oo oo / ---~|+++_|--- 1 = RX (connect E1 Transmitter to that port) 2 = TX (connect E1 Receiver to that port)
Updated by laforge about 8 years ago · 12 revisions