DUL 20 » History » Version 7
roh, 05/13/2020 07:40 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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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 | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
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14 | 1 | laforge | |
15 | 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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17 | h3. GPS (RJ45) |
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19 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
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20 | |||
21 | h3. EC (RJ45) |
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22 | |||
23 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
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24 | |||
25 | h3. AUX (RJ45) |
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26 | |||
27 | ? |
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28 | |||
29 | h3. LMT A (RJ45) |
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31 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
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33 | The pinout is shown below. Please note it is *different from RBS3000!* |
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34 | |||
35 | |_.RJ45|_.DB9|_.Name| |
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36 | 3 | laforge | |1|5|GND| |
37 | |2|3|TXD (of PC)| |
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38 | 1 | laforge | |3|2|RXD (of PC)| |
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40 | The [default?] baud rate settings are 9600 8N1 |
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41 | |||
42 | h3. LMT B (RJ45) |
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43 | |||
44 | _Site LAN_ Ethernet, for adminstrative purpose |
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45 | |||
46 | h3. TN A (RJ45) |
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48 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
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49 | |||
50 | h3. TN B (SFP) |
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51 | |||
52 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
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53 | |||
54 | h3. IDL (HSIO) |
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55 | |||
56 | Inter-DU-Link for cross-connecting multiple DU. |
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57 | |||
58 | 4 | tnt | h3. RI A..F (SFP) |
59 | 1 | laforge | |
60 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
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61 | |||
62 | 2 | laforge | h2. Accessing it |
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64 | h3. SSH via LMT-B |
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66 | 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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67 | |||
68 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
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69 | <pre> |
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70 | Host dul |
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71 | HostName 169.254.1.10 |
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72 | KexAlgorithms diffie-hellman-group1-sha1 |
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73 | Ciphers 3des-cbc |
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74 | </pre> |
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75 | |||
76 | and then log in as the 'rbs' user with 'rbs' password. |