E1-to-RJ45 » History » Version 11
dexter, 02/19/2016 10:48 PM
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| 2 | 11 | dexter | h2. Howto build your E1<>RJ45 cable |
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| 5 | 1 | We used a Cat-7 Ethernet cable to build our E1<>RJ45 cable to connect the BTS with the BSC. |
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| 6 | |||
| 7 | Things you need: |
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| 8 | 11 | dexter | * one Cat-7 Ethernet cable |
| 9 | * two twinax plugs (BR2) |
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| 10 | * some heat shrink tube |
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| 11 | * soldering-iron |
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| 12 | * multimeter (optional) |
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| 13 | * a sharp knife :) |
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| 14 | 1 | ||
| 15 | |||
| 16 | 11 | dexter | h3. Step-by-step guide |
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| 18 | 11 | dexter | |
| 19 | *One:* |
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| 20 | |||
| 21 | 1 | 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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| 23 | 2 | [[Image(IMG_0960-1.JPG, 15%)]] [[Image(IMG_0960-2.JPG, 15%)]] |
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| 24 | 1 | ||
| 25 | 11 | dexter | *Two:* |
| 26 | 1 | ||
| 27 | 11 | dexter | 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). |
| 28 | 2 | ||
| 29 | 1 | [[Image(IMG_0960-4.JPG, 15%)]] [[Image(IMG_0960-5.JPG, 15%)]] [[Image(IMG_0960-7.JPG, 15%)]] |
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| 30 | |||
| 31 | 11 | dexter | *Three:* |
| 32 | 1 | ||
| 33 | 11 | dexter | Sort your twinax plugs to make sure you build them in the right order. ;) |
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| 35 | 5 | We used heat shrink tube to stabilize our cable around the plugs. |
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| 36 | |||
| 37 | 1 | [[Image(IMG_0960-9.JPG, 15%)]] [[Image(IMG_0960-11.JPG, 15%)]] |
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| 38 | [[Image(IMG_0960-12.JPG, 15%)]] [[Image(IMG_0960-17.JPG, 15%)]] |
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| 40 | 11 | dexter | *Four:* |
| 41 | 1 | ||
| 42 | 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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| 43 | |||
| 44 | [[Image(IMG_0960-19.JPG, 15%)]] |
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| 46 | 11 | dexter | *Five:* |
| 47 | 1 | ||
| 48 | 11 | dexter | Repeat step *three* and *four* to build the second plug. |
| 49 | 1 | ||
| 50 | 11 | dexter | *Done.* |
| 51 | 1 | ||
| 52 | [[Image(IMG_6379-1.JPG, 15%)]] |
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| 53 | 5 | ||
| 54 | 6 | ||
| 55 | 11 | dexter | h2. Detailed pinout |
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| 58 | 9 | dexter | A detailed pinout for your reference: |
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| 60 | 11 | dexter | <pre> |
| 61 | 9 | dexter | |
| 62 | Signals on the RJ45 plug: |
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| 63 | 11 | dexter | ++++++++++ |
| 64 | 1 | / / / /| |
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| 65 | / / / / | |
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| 66 | 11 | dexter | / /+++++++_/ / | |
| 67 | / ++++++++ / | |
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| 68 | 9 | dexter | / / / / / / / / / / / | |
| 69 | / / / / / / / / / / / / |
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| 70 | 1 | / /_/_/_/_/_/_/_/_/ / / |
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| 71 | | | | | | | | | | | | / |
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| 72 | 8 | dexter | | |8|7|6|5|4|3|2|1| | / |
| 73 | | |_|_|_|_|_|_|_|_| | / |
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| 74 | 11 | dexter | |+++++++++_|/ |
| 75 | 1 | | |/ |
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| 76 | 11 | dexter | \+++/ |
| 77 | 1 | ||
| 78 | 8 | dexter | 1 = RX1 |
| 79 | 2 = RX2 |
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| 80 | 3 = NC |
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| 81 | 1 | 4 = TX1 |
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| 82 | 5 = TX2 |
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| 83 | 8 | dexter | 6 = NC |
| 84 | 7 = NC |
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| 85 | 8 = NC |
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| 86 | |||
| 87 | |||
| 88 | Signals on the twinax plugs: |
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| 89 | |||
| 90 | E1 Transmitter: |
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| 91 | 11 | dexter | +_ |
| 92 | .-_ '@-. |
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| 93 | .' @. |
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| 94 | 8 | dexter | / 1 2 \ |
| 95 | 1 | : ## ## ; |
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| 96 | 8 | dexter | | ## ## | |
| 97 | : ; |
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| 98 | 1 | \ ############# / |
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| 99 | 11 | dexter | @. ######### .' |
| 100 | @-.++_.-' |
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| 101 | 8 | dexter | |
| 102 | 1 = TX1 |
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| 103 | 2 = TX2 |
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| 104 | |||
| 105 | |||
| 106 | E1 Receiver: |
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| 107 | 11 | dexter | +_ |
| 108 | .-_ '@-. |
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| 109 | .' @. |
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| 110 | 8 | dexter | / 1 2 \ |
| 111 | : ## ## ; |
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| 112 | | ## ## | |
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| 113 | : ; |
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| 114 | \ ############# / |
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| 115 | 11 | dexter | @. ######### .' |
| 116 | @-.++_.-' |
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| 117 | 8 | dexter | |
| 118 | 1 = RX1 |
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| 119 | 1 | 2 = RX2 |
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| 120 | |||
| 121 | 8 | dexter | Note: The drawings are showing the plugs point of view. |
| 122 | Note: This is a differential connection with symetric signals |
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| 123 | so you do not have to care about the polarity. |
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| 124 | |||
| 125 | |||
| 126 | Cable connection on the BS11: |
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| 127 | |||
| 128 | 11 | dexter | ---~++++_--- |
| 129 | 10 | dexter | / 12 \ |
| 130 | \ oo oo / |
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| 131 | 11 | dexter | ---~|+++_|--- |
| 132 | 8 | dexter | |
| 133 | 9 | dexter | 1 = RX (connect E1 Transmitter to that port) |
| 134 | 2 = TX (connect E1 Receiver to that port) |
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| 135 | 11 | dexter | </pre> |
