E1-to-RJ45 » History » Version 9
dexter, 02/19/2016 10:47 PM
1 | 1 | == Howto build your E1<>RJ45 cable == |
|
---|---|---|---|
2 | |||
3 | We used a Cat-7 Ethernet cable to build our E1<>RJ45 cable to connect the BTS with the BSC. |
||
4 | |||
5 | Things you need: |
||
6 | * one Cat-7 Ethernet cable |
||
7 | * two twinax plugs (BR2) |
||
8 | * some heat shrink tube |
||
9 | * soldering-iron |
||
10 | * multimeter (optional) |
||
11 | * a sharp knife :) |
||
12 | |||
13 | === Step-by-step guide === |
||
14 | |||
15 | '''One:''' |
||
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. |
|
18 | 1 | ||
19 | 2 | [[Image(IMG_0960-1.JPG, 15%)]] [[Image(IMG_0960-2.JPG, 15%)]] |
|
20 | 1 | ||
21 | '''Two:''' |
||
22 | |||
23 | 9 | 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). |
24 | 1 | ||
25 | 2 | [[Image(IMG_0960-4.JPG, 15%)]] [[Image(IMG_0960-5.JPG, 15%)]] [[Image(IMG_0960-7.JPG, 15%)]] |
|
26 | 1 | ||
27 | '''Three:''' |
||
28 | |||
29 | Sort your twinax plugs to make sure you build them in the right order. ;)[[BR]] |
||
30 | We used heat shrink tube to stabilize our cable around the plugs. |
||
31 | |||
32 | 5 | [[Image(IMG_0960-9.JPG, 15%)]] [[Image(IMG_0960-11.JPG, 15%)]] |
|
33 | [[Image(IMG_0960-12.JPG, 15%)]] [[Image(IMG_0960-17.JPG, 15%)]] |
||
34 | 2 | ||
35 | 1 | '''Four:''' |
|
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. |
|
38 | 1 | ||
39 | 5 | [[Image(IMG_0960-19.JPG, 15%)]] |
|
40 | 1 | ||
41 | '''Five:''' |
||
42 | |||
43 | 7 | Repeat step '''three''' and '''four''' to build the second plug. |
|
44 | 1 | ||
45 | 2 | '''Done.''' |
|
46 | 5 | ||
47 | 6 | [[Image(IMG_6379-1.JPG, 15%)]] |
|
48 | 8 | dexter | |
49 | 1 | == Detailed pinout == |
|
50 | 9 | dexter | |
51 | A detailed pinout for your reference: |
||
52 | |||
53 | 1 | {{{ |
|
54 | |||
55 | Signals on the RJ45 plug: |
||
56 | 8 | dexter | ____________________ |
57 | 9 | dexter | / / / /| |
58 | / / / / | |
||
59 | / /_______________/ / | |
||
60 | / ________________ / | |
||
61 | / / / / / / / / / / / | |
||
62 | / / / / / / / / / / / / |
||
63 | / /_/_/_/_/_/_/_/_/ / / |
||
64 | | | | | | | | | | | | / |
||
65 | | |8|7|6|5|4|3|2|1| | / |
||
66 | | |_|_|_|_|_|_|_|_| | / |
||
67 | |___________________|/ |
||
68 | 8 | dexter | | |/ |
69 | \______/ |
||
70 | |||
71 | 1 = RX1 |
||
72 | 2 = RX2 |
||
73 | 3 = NC |
||
74 | 4 = TX1 |
||
75 | 5 = TX2 |
||
76 | 6 = NC |
||
77 | 7 = NC |
||
78 | 8 = NC |
||
79 | |||
80 | |||
81 | Signals on the twinax plugs: |
||
82 | |||
83 | E1 Transmitter: |
||
84 | ___ |
||
85 | .-'' '`-. |
||
86 | .' `. |
||
87 | / 1 2 \ |
||
88 | : ## ## ; |
||
89 | | ## ## | |
||
90 | : ; |
||
91 | \ ############# / |
||
92 | `. ######### .' |
||
93 | `-._____.-' |
||
94 | |||
95 | 1 = TX1 |
||
96 | 2 = TX2 |
||
97 | |||
98 | |||
99 | E1 Receiver: |
||
100 | ___ |
||
101 | .-'' '`-. |
||
102 | .' `. |
||
103 | / 1 2 \ |
||
104 | : ## ## ; |
||
105 | | ## ## | |
||
106 | : ; |
||
107 | \ ############# / |
||
108 | `. ######### .' |
||
109 | `-._____.-' |
||
110 | |||
111 | 1 = RX1 |
||
112 | 1 | 2 = RX2 |
|
113 | |||
114 | 8 | dexter | Note: The drawings are showing the plugs point of view. |
115 | Note: This is a differential connection with symetric signals |
||
116 | so you do not have to care about the polarity. |
||
117 | |||
118 | |||
119 | Cable connection on the BS11: |
||
120 | |||
121 | ~~~~~~~_________~~~~~~ |
||
122 | / oo oo \ |
||
123 | \ 12 / |
||
124 | ~~~~~~~|_______|~~~~~~ |
||
125 | |||
126 | 9 | dexter | 1 = RX (connect E1 Transmitter to that port) |
127 | 2 = TX (connect E1 Receiver to that port) |
||
128 | 8 | dexter | }}} |