DUL 20 » History » Version 12
laforge, 11/03/2020 03:24 PM
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| 1 | 12 | laforge | {{>toc}} |
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| 2 | |||
| 3 | 1 | laforge | h1. DUL 20 |
| 4 | |||
| 5 | 5 | roh | DUL is a Digital Unit for LTE. It contains the eNodeB function down to the baseband processing. |
| 6 | 1 | laforge | |
| 7 | {{thumbnail(DUL20_01_front_complete.jpg, size=900)}} |
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| 8 | |||
| 9 | 7 | roh | {{>toc}} |
| 10 | |||
| 11 | 1 | laforge | h2. Connectors |
| 12 | |||
| 13 | h3. PWR |
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| 14 | 7 | roh | |
| 15 | 1 | laforge | 48V DC connector. The negative rail is towards the edge of the unit. Also seems to power up fine at 36V |
| 16 | |||
| 17 | 9 | laforge | The connectory type is https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts. |
| 18 | |||
| 19 | 8 | roh | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
| 20 | |||
| 21 | 1 | laforge | h3. GPS (RJ45) |
| 22 | |||
| 23 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
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| 24 | |||
| 25 | 8 | roh | {{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}} |
| 26 | |||
| 27 | 1 | laforge | h3. EC (RJ45) |
| 28 | |||
| 29 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
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| 30 | |||
| 31 | h3. AUX (RJ45) |
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| 32 | |||
| 33 | ? |
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| 34 | |||
| 35 | h3. LMT A (RJ45) |
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| 36 | |||
| 37 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
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| 38 | |||
| 39 | 10 | laforge | The pinout is shown below. Please note it is *different from RBS3000!*, but identical to that of the [[DUG 20]] |
| 40 | 1 | laforge | |
| 41 | |_.RJ45|_.DB9|_.Name| |
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| 42 | 3 | laforge | |1|5|GND| |
| 43 | |2|3|TXD (of PC)| |
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| 44 | 1 | laforge | |3|2|RXD (of PC)| |
| 45 | |||
| 46 | 10 | laforge | The [default?] baud rate settings are 9600 8N1. |
| 47 | |||
| 48 | This port provides RS-232 access to the [[OSE]] shell |
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| 49 | 1 | laforge | |
| 50 | h3. LMT B (RJ45) |
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| 51 | |||
| 52 | _Site LAN_ Ethernet, for adminstrative purpose |
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| 53 | |||
| 54 | 11 | laforge | This is the interface used for configuration of the DUL during installation. |
| 55 | |||
| 56 | 8 | roh | {{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}} |
| 57 | |||
| 58 | 1 | laforge | h3. TN A (RJ45) |
| 59 | |||
| 60 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
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| 61 | |||
| 62 | h3. TN B (SFP) |
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| 63 | |||
| 64 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
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| 65 | |||
| 66 | 8 | roh | {{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}} |
| 67 | |||
| 68 | 1 | laforge | h3. IDL (HSIO) |
| 69 | |||
| 70 | Inter-DU-Link for cross-connecting multiple DU. |
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| 71 | |||
| 72 | 4 | tnt | h3. RI A..F (SFP) |
| 73 | 1 | laforge | |
| 74 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
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| 75 | 8 | roh | |
| 76 | {{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}} |
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| 77 | |||
| 78 | h2. Overview Pictures |
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| 79 | |||
| 80 | {{thumbnail(DUL20_01_front_perspective.jpg, size=400)}} |
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| 81 | {{thumbnail(DUL20_01_left_perspective.jpg, size=400)}} |
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| 82 | {{thumbnail(DUL20_01_right_perspective.jpg, size=400)}} |
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| 83 | {{thumbnail(DUL20_01_back_perspective.jpg, size=400)}} |
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| 84 | {{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}} |
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| 85 | 1 | laforge | |
| 86 | 2 | laforge | h2. Accessing it |
| 87 | |||
| 88 | h3. SSH via LMT-B |
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| 89 | |||
| 90 | 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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| 91 | |||
| 92 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
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| 93 | <pre> |
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| 94 | Host dul |
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| 95 | HostName 169.254.1.10 |
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| 96 | KexAlgorithms diffie-hellman-group1-sha1 |
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| 97 | Ciphers 3des-cbc |
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| 98 | </pre> |
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| 99 | |||
| 100 | and then log in as the 'rbs' user with 'rbs' password. |
