DUL 20 » History » Version 8
roh, 05/13/2020 07:58 PM
1 | 1 | laforge | h1. DUL 20 |
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3 | 5 | roh | DUL is a Digital Unit for LTE. It contains the eNodeB function down to the baseband processing. |
4 | 1 | laforge | |
5 | {{thumbnail(DUL20_01_front_complete.jpg, size=900)}} |
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6 | |||
7 | 7 | roh | {{>toc}} |
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9 | 1 | laforge | h2. Connectors |
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11 | h3. PWR |
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12 | 7 | roh | |
13 | 1 | laforge | 48V DC connector. The negative rail is towards the edge of the unit. Also seems to power up fine at 36V |
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15 | 8 | roh | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
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17 | 1 | laforge | h3. GPS (RJ45) |
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19 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
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21 | 8 | roh | {{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}} |
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23 | 1 | laforge | h3. EC (RJ45) |
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25 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
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27 | h3. AUX (RJ45) |
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28 | |||
29 | ? |
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31 | h3. LMT A (RJ45) |
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32 | |||
33 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
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35 | The pinout is shown below. Please note it is *different from RBS3000!* |
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36 | |||
37 | |_.RJ45|_.DB9|_.Name| |
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38 | 3 | laforge | |1|5|GND| |
39 | |2|3|TXD (of PC)| |
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40 | 1 | laforge | |3|2|RXD (of PC)| |
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42 | The [default?] baud rate settings are 9600 8N1 |
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44 | h3. LMT B (RJ45) |
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46 | _Site LAN_ Ethernet, for adminstrative purpose |
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47 | |||
48 | 8 | roh | {{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}} |
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50 | 1 | laforge | h3. TN A (RJ45) |
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52 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
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53 | |||
54 | h3. TN B (SFP) |
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56 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
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57 | |||
58 | 8 | roh | {{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}} |
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60 | 1 | laforge | h3. IDL (HSIO) |
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62 | Inter-DU-Link for cross-connecting multiple DU. |
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63 | |||
64 | 4 | tnt | h3. RI A..F (SFP) |
65 | 1 | laforge | |
66 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
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67 | 8 | roh | |
68 | {{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}} |
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69 | |||
70 | h2. Overview Pictures |
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72 | {{thumbnail(DUL20_01_front_perspective.jpg, size=400)}} |
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73 | {{thumbnail(DUL20_01_left_perspective.jpg, size=400)}} |
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74 | {{thumbnail(DUL20_01_right_perspective.jpg, size=400)}} |
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75 | {{thumbnail(DUL20_01_back_perspective.jpg, size=400)}} |
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76 | {{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}} |
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77 | 1 | laforge | |
78 | 2 | laforge | h2. Accessing it |
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80 | h3. SSH via LMT-B |
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82 | It appears the DUL will always respond to 169.254.1.10/16, no matter what kind of real/other IP address has been set. |
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84 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
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85 | <pre> |
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86 | Host dul |
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87 | HostName 169.254.1.10 |
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88 | KexAlgorithms diffie-hellman-group1-sha1 |
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89 | Ciphers 3des-cbc |
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90 | </pre> |
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91 | |||
92 | and then log in as the 'rbs' user with 'rbs' password. |