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 | }}} |