Cellular Network Infrastructure » Radio Access Network » OsmoBSC

== 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''' (blue white/blue), you can use a multimeter if you are not sure that you got the correct 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_0960-7.JPG, 15%)]]

'''Four:'''

Now you can put everything on the first part of the cable and assemble it.  Use a soldering-iron to fixate the each of the two pins of the plug with your wires.

[[Image(IMG_0960-9.JPG, 15%)]] [[Image(IMG_0960-11.JPG, 15%)]] [[Image(IMG_0960-12.JPG, 15%)]] [[Image(IMG_0960-17.JPG, 15%)]]

'''Five:'''

Repeat step '''three''' and '''five''' to build the second plug.

[[Image(IMG_0960-19.JPG, 15%)]]

'''Done.'''