DUL 20 » History » Version 15
laforge, 11/12/2020 10:41 AM
| 1 | 1 | laforge | h1. DUL 20 |
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| 2 | |||
| 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}} |
| 8 | |||
| 9 | 15 | laforge | h2. Further Reading |
| 10 | |||
| 11 | {{child_pages}} |
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| 12 | |||
| 13 | 1 | laforge | h2. Connectors |
| 14 | |||
| 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 |
| 18 | |||
| 19 | 9 | laforge | The connectory type is https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts. |
| 20 | |||
| 21 | 8 | roh | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
| 22 | |||
| 23 | 1 | laforge | h3. GPS (RJ45) |
| 24 | |||
| 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)}} |
| 28 | |||
| 29 | 1 | laforge | h3. EC (RJ45) |
| 30 | |||
| 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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| 40 | |||
| 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)| |
| 47 | |||
| 48 | 10 | laforge | The [default?] baud rate settings are 9600 8N1. |
| 49 | |||
| 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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| 55 | |||
| 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)}} |
| 59 | |||
| 60 | 1 | laforge | h3. TN A (RJ45) |
| 61 | |||
| 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)}} |
| 69 | |||
| 70 | 1 | laforge | h3. IDL (HSIO) |
| 71 | |||
| 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 |
| 89 | |||
| 90 | h3. SSH via LMT-B |
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| 91 | |||
| 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. |
