DUL 20 » History » Version 4
tnt, 09/06/2019 04:18 PM
| 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)| |
| 35 | |||
| 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 | 4 | tnt | h3. RI A..F (SFP) |
| 55 | 1 | laforge | |
| 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 |
| 59 | |||
| 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. |
