E1-to-RJ45 » History » Version 8
dexter, 02/19/2016 10:47 PM
| 1 | 1 | == Howto build your E1<>RJ45 cable == |
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| 2 | |||
| 3 | We used a Cat-7 Ethernet cable to build our E1<>RJ45 cable to connect the BTS with the BSC. |
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| 4 | |||
| 5 | Things you need: |
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| 6 | * one Cat-7 Ethernet cable |
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| 7 | * two twinax plugs (BR2) |
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| 8 | * some heat shrink tube |
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| 9 | * soldering-iron |
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| 10 | * multimeter (optional) |
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| 11 | * a sharp knife :) |
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| 12 | |||
| 13 | === Step-by-step guide === |
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| 14 | |||
| 15 | '''One:''' |
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| 16 | |||
| 17 | 3 | 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. |
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| 18 | 1 | ||
| 19 | 2 | [[Image(IMG_0960-1.JPG, 15%)]] [[Image(IMG_0960-2.JPG, 15%)]] |
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| 20 | 1 | ||
| 21 | '''Two:''' |
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| 22 | |||
| 23 | 4 | 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). |
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| 24 | 1 | ||
| 25 | 2 | [[Image(IMG_0960-4.JPG, 15%)]] [[Image(IMG_0960-5.JPG, 15%)]] [[Image(IMG_0960-7.JPG, 15%)]] |
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| 26 | 1 | ||
| 27 | '''Three:''' |
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| 28 | |||
| 29 | Sort your twinax plugs to make sure you build them in the right order. ;)[[BR]] |
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| 30 | We used heat shrink tube to stabilize our cable around the plugs. |
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| 31 | |||
| 32 | 5 | [[Image(IMG_0960-9.JPG, 15%)]] [[Image(IMG_0960-11.JPG, 15%)]] |
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| 33 | [[Image(IMG_0960-12.JPG, 15%)]] [[Image(IMG_0960-17.JPG, 15%)]] |
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| 34 | 2 | ||
| 35 | 1 | '''Four:''' |
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| 36 | |||
| 37 | 5 | 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. |
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| 38 | 1 | ||
| 39 | 5 | [[Image(IMG_0960-19.JPG, 15%)]] |
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| 40 | 1 | ||
| 41 | '''Five:''' |
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| 42 | |||
| 43 | 7 | Repeat step '''three''' and '''four''' to build the second plug. |
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| 44 | 1 | ||
| 45 | 2 | '''Done.''' |
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| 46 | 5 | ||
| 47 | 6 | [[Image(IMG_6379-1.JPG, 15%)]] |
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| 48 | 8 | dexter | |
| 49 | == Detailed pinout == |
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| 50 | {{{ |
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| 51 | |||
| 52 | Signals on the RJ45 plug: |
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| 53 | ____________________ |
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| 54 | / / / | |
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| 55 | / / / /| |
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| 56 | / /_______________/ / | |
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| 57 | / ________________ / | |
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| 58 | / / / / / / / / / / / | |
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| 59 | / / / / / / / / / / / / |
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| 60 | / /_/_/_/_/_/_/_/_/ / / |
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| 61 | | | | | | | | | | | | / |
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| 62 | | |8|7|6|5|4|3|2|1| | / |
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| 63 | | |_|_|_|_|_|_|_|_| |/ |
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| 64 | |___________________| |
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| 65 | | |/ |
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| 66 | \______/ |
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| 67 | |||
| 68 | 1 = RX1 |
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| 69 | 2 = RX2 |
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| 70 | 3 = NC |
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| 71 | 4 = TX1 |
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| 72 | 5 = TX2 |
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| 73 | 6 = NC |
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| 74 | 7 = NC |
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| 75 | 8 = NC |
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| 76 | |||
| 77 | |||
| 78 | Signals on the twinax plugs: |
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| 79 | |||
| 80 | E1 Transmitter: |
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| 81 | ___ |
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| 82 | .-'' '`-. |
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| 83 | .' `. |
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| 84 | / 1 2 \ |
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| 85 | : ## ## ; |
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| 86 | | ## ## | |
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| 87 | : ; |
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| 88 | \ ############# / |
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| 89 | `. ######### .' |
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| 90 | `-._____.-' |
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| 91 | |||
| 92 | 1 = TX1 |
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| 93 | 2 = TX2 |
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| 94 | |||
| 95 | |||
| 96 | E1 Receiver: |
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| 97 | ___ |
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| 98 | .-'' '`-. |
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| 99 | .' `. |
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| 100 | / 1 2 \ |
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| 101 | : ## ## ; |
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| 102 | | ## ## | |
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| 103 | : ; |
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| 104 | \ ############# / |
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| 105 | `. ######### .' |
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| 106 | `-._____.-' |
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| 107 | |||
| 108 | 1 = RX1 |
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| 109 | 2 = RX2 |
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| 110 | |||
| 111 | Note: The drawings are showing the plugs point of view. |
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| 112 | Note: This is a differential connection with symetric signals |
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| 113 | so you do not have to care about the polarity. |
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| 114 | |||
| 115 | |||
| 116 | Cable connection on the BS11: |
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| 117 | |||
| 118 | ~~~~~~~_________~~~~~~ |
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| 119 | / oo oo \ |
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| 120 | \ 12 / |
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| 121 | ~~~~~~~|_______|~~~~~~ |
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| 122 | |||
| 123 | 1 = RX (E1 Transmitter to that port) |
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| 124 | 2 = TX (E1 Receiver to that port) |
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| 125 | }}} |
