E1-to-RJ45 » History » Revision 12
Revision 11 (dexter, 02/19/2016 10:48 PM) → Revision 12/14 (laforge, 02/21/2016 11:04 AM)
h2. 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 :) h3. 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. !{width:40%}IMG_0960-1.JPG! !{width:40%}IMG_0960-2.JPG! [[Image(IMG_0960-1.JPG, 15%)]] [[Image(IMG_0960-2.JPG, 15%)]] *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). !{width:30%}IMG_0960-4.JPG! !{width:30%}IMG_0960-5.JPG! !{width:30%}IMG_0960-7.JPG! [[Image(IMG_0960-4.JPG, 15%)]] [[Image(IMG_0960-5.JPG, 15%)]] [[Image(IMG_0960-7.JPG, 15%)]] *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. !{width:50%}IMG_0960-19.JPG! [[Image(IMG_0960-19.JPG, 15%)]] *Five:* Repeat step *three* and *four* to build the second plug. *Done.* !{width:50%}IMG_6379-1.JPG! [[Image(IMG_6379-1.JPG, 15%)]] h2. Detailed pinout A detailed pinout for your reference: <pre> 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) </pre>
