DUL 20 » History » Version 3
laforge, 09/06/2019 04:17 PM
fix serial pinout. Some of Ericssons manuals are wrong.
1 | 1 | laforge | {{>toc}} |
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2 | |||
3 | h1. DUL 20 |
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4 | |||
5 | DUL is a Digutal Unit for LTE. It contains the eNodeB function down to the baseband processing. |
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6 | |||
7 | h2. Connectors |
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8 | |||
9 | h3. PWR |
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10 | |||
11 | 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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12 | |||
13 | h3. GPS (RJ45) |
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14 | |||
15 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
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16 | |||
17 | h3. EC (RJ45) |
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18 | |||
19 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
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20 | |||
21 | h3. AUX (RJ45) |
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22 | |||
23 | ? |
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24 | |||
25 | h3. LMT A (RJ45) |
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26 | |||
27 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
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28 | |||
29 | The pinout is shown below. Please note it is *different from RBS3000!* |
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30 | |||
31 | |_.RJ45|_.DB9|_.Name| |
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32 | 3 | laforge | |1|5|GND| |
33 | |2|3|TXD (of PC)| |
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34 | 1 | laforge | |3|2|RXD (of PC)| |
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36 | The [default?] baud rate settings are 9600 8N1 |
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37 | |||
38 | h3. LMT B (RJ45) |
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39 | |||
40 | _Site LAN_ Ethernet, for adminstrative purpose |
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41 | |||
42 | h3. TN A (RJ45) |
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43 | |||
44 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
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45 | |||
46 | h3. TN B (SFP) |
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47 | |||
48 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
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49 | |||
50 | h3. IDL (HSIO) |
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51 | |||
52 | Inter-DU-Link for cross-connecting multiple DU. |
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53 | |||
54 | h3. RI A..F (SPF) |
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55 | |||
56 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
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57 | |||
58 | 2 | laforge | h2. Accessing it |
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60 | h3. SSH via LMT-B |
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61 | |||
62 | 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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63 | |||
64 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
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65 | <pre> |
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66 | Host dul |
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67 | HostName 169.254.1.10 |
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68 | KexAlgorithms diffie-hellman-group1-sha1 |
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69 | Ciphers 3des-cbc |
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70 | </pre> |
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71 | |||
72 | and then log in as the 'rbs' user with 'rbs' password. |