DUL 20 » History » Version 15
laforge, 11/12/2020 10:41 AM
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 | 15 | laforge | h2. Further Reading |
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11 | {{child_pages}} |
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13 | 1 | laforge | h2. Connectors |
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15 | h3. PWR |
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16 | 7 | roh | |
17 | 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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19 | 9 | laforge | The connectory type is https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts. |
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21 | 8 | roh | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
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23 | 1 | laforge | h3. GPS (RJ45) |
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25 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
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26 | |||
27 | 8 | roh | {{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}} |
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29 | 1 | laforge | h3. EC (RJ45) |
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31 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
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32 | |||
33 | h3. AUX (RJ45) |
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34 | |||
35 | ? |
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36 | |||
37 | h3. LMT A (RJ45) |
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38 | |||
39 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
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41 | 10 | laforge | The pinout is shown below. Please note it is *different from RBS3000!*, but identical to that of the [[DUG 20]] |
42 | 1 | laforge | |
43 | |_.RJ45|_.DB9|_.Name| |
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44 | 3 | laforge | |1|5|GND| |
45 | |2|3|TXD (of PC)| |
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46 | 1 | laforge | |3|2|RXD (of PC)| |
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48 | 10 | laforge | The [default?] baud rate settings are 9600 8N1. |
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50 | This port provides RS-232 access to the [[OSE]] shell |
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51 | 1 | laforge | |
52 | h3. LMT B (RJ45) |
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53 | |||
54 | _Site LAN_ Ethernet, for adminstrative purpose |
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56 | 11 | laforge | This is the interface used for configuration of the DUL during installation. |
57 | |||
58 | 8 | roh | {{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}} |
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60 | 1 | laforge | h3. TN A (RJ45) |
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62 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
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63 | |||
64 | h3. TN B (SFP) |
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65 | |||
66 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
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67 | |||
68 | 8 | roh | {{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}} |
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70 | 1 | laforge | h3. IDL (HSIO) |
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72 | Inter-DU-Link for cross-connecting multiple DU. |
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73 | |||
74 | 4 | tnt | h3. RI A..F (SFP) |
75 | 1 | laforge | |
76 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
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77 | 8 | roh | |
78 | {{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}} |
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79 | |||
80 | h2. Overview Pictures |
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81 | |||
82 | {{thumbnail(DUL20_01_front_perspective.jpg, size=400)}} |
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83 | {{thumbnail(DUL20_01_left_perspective.jpg, size=400)}} |
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84 | {{thumbnail(DUL20_01_right_perspective.jpg, size=400)}} |
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85 | {{thumbnail(DUL20_01_back_perspective.jpg, size=400)}} |
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86 | {{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}} |
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87 | 1 | laforge | |
88 | 2 | laforge | h2. Accessing it |
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90 | h3. SSH via LMT-B |
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92 | 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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93 | |||
94 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
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95 | <pre> |
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96 | Host dul |
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97 | HostName 169.254.1.10 |
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98 | KexAlgorithms diffie-hellman-group1-sha1 |
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99 | Ciphers 3des-cbc |
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100 | </pre> |
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101 | |||
102 | and then log in as the 'rbs' user with 'rbs' password. |
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103 | 14 | laforge | |
104 | h2. Mass Storage |
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105 | |||
106 | The DUL20 has an internal CompactFlash slot. The slot is only accessible when disassembling the unit, removing the circuit board from the enclosure. |
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107 | |||
108 | It uses 2GB CFlash cards with no known partition table / format. |