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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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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16 | 11 | dexter | h3. Step-by-step guide |
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18 | 11 | dexter | |
19 | *One:* |
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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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25 | 11 | dexter | *Two:* |
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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). |
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29 | 1 | [[Image(IMG_0960-4.JPG, 15%)]] [[Image(IMG_0960-5.JPG, 15%)]] [[Image(IMG_0960-7.JPG, 15%)]] |
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31 | 11 | dexter | *Three:* |
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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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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:* |
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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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44 | [[Image(IMG_0960-19.JPG, 15%)]] |
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46 | 11 | dexter | *Five:* |
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48 | 11 | dexter | Repeat step *three* and *four* to build the second plug. |
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50 | 11 | dexter | *Done.* |
51 | 1 | ||
52 | [[Image(IMG_6379-1.JPG, 15%)]] |
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53 | 5 | ||
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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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87 | |||
88 | Signals on the twinax plugs: |
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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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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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125 | |||
126 | Cable connection on the BS11: |
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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> |