E1-to-RJ45 » History » Revision 9
Revision 8 (dexter, 02/19/2016 10:47 PM) → Revision 9/14 (dexter, 02/19/2016 10:47 PM)
== 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. [[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''' (green white/green) and pin 4 and 5 for '''TX''', Use '''TX''' (blue white/blue), you can use a Multimeter to determine multimeter if you are not sure you got the correct pairs. wires. Cut off the other wires we do not need them (yet). [[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. ;)[[BR]] 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. [[Image(IMG_0960-19.JPG, 15%)]] '''Five:''' Repeat step '''three''' and '''four''' to build the second plug. '''Done.''' [[Image(IMG_6379-1.JPG, 15%)]] == 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: ~~~~~~~_________~~~~~~ / oo oo \ \ 12 / ~~~~~~~|_______|~~~~~~ 1 = RX (connect E1 (E1 Transmitter to that port) 2 = TX (connect E1 (E1 Receiver to that port) }}}
