DUL 20 » History » Version 8
roh, 05/13/2020 07:58 PM
| 1 | 1 | laforge | h1. DUL 20 |
|---|---|---|---|
| 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)}} |
||
| 6 | |||
| 7 | 7 | roh | {{>toc}} |
| 8 | |||
| 9 | 1 | laforge | h2. Connectors |
| 10 | |||
| 11 | h3. PWR |
||
| 12 | 7 | roh | |
| 13 | 1 | laforge | 48V DC connector. The negative rail is towards the edge of the unit. Also seems to power up fine at 36V |
| 14 | |||
| 15 | 8 | roh | {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} |
| 16 | |||
| 17 | 1 | laforge | h3. GPS (RJ45) |
| 18 | |||
| 19 | Connection for an Ericsson GPS module, contains 1PPS and UART signals |
||
| 20 | |||
| 21 | 8 | roh | {{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}} |
| 22 | |||
| 23 | 1 | laforge | h3. EC (RJ45) |
| 24 | |||
| 25 | Environment Control? Probably some RS-485 to control fans, power management, UPS, ... |
||
| 26 | |||
| 27 | h3. AUX (RJ45) |
||
| 28 | |||
| 29 | ? |
||
| 30 | |||
| 31 | h3. LMT A (RJ45) |
||
| 32 | |||
| 33 | A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). |
||
| 34 | |||
| 35 | The pinout is shown below. Please note it is *different from RBS3000!* |
||
| 36 | |||
| 37 | |_.RJ45|_.DB9|_.Name| |
||
| 38 | 3 | laforge | |1|5|GND| |
| 39 | |2|3|TXD (of PC)| |
||
| 40 | 1 | laforge | |3|2|RXD (of PC)| |
| 41 | |||
| 42 | The [default?] baud rate settings are 9600 8N1 |
||
| 43 | |||
| 44 | h3. LMT B (RJ45) |
||
| 45 | |||
| 46 | _Site LAN_ Ethernet, for adminstrative purpose |
||
| 47 | |||
| 48 | 8 | roh | {{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}} |
| 49 | |||
| 50 | 1 | laforge | h3. TN A (RJ45) |
| 51 | |||
| 52 | _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 |
||
| 53 | |||
| 54 | h3. TN B (SFP) |
||
| 55 | |||
| 56 | _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. |
||
| 57 | |||
| 58 | 8 | roh | {{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}} |
| 59 | |||
| 60 | 1 | laforge | h3. IDL (HSIO) |
| 61 | |||
| 62 | Inter-DU-Link for cross-connecting multiple DU. |
||
| 63 | |||
| 64 | 4 | tnt | h3. RI A..F (SFP) |
| 65 | 1 | laforge | |
| 66 | Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. |
||
| 67 | 8 | roh | |
| 68 | {{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}} |
||
| 69 | |||
| 70 | h2. Overview Pictures |
||
| 71 | |||
| 72 | {{thumbnail(DUL20_01_front_perspective.jpg, size=400)}} |
||
| 73 | {{thumbnail(DUL20_01_left_perspective.jpg, size=400)}} |
||
| 74 | {{thumbnail(DUL20_01_right_perspective.jpg, size=400)}} |
||
| 75 | {{thumbnail(DUL20_01_back_perspective.jpg, size=400)}} |
||
| 76 | {{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}} |
||
| 77 | 1 | laforge | |
| 78 | 2 | laforge | h2. Accessing it |
| 79 | |||
| 80 | h3. SSH via LMT-B |
||
| 81 | |||
| 82 | 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. |
||
| 83 | |||
| 84 | You have to use the following SSH config to speak the ancient cipher/key-exchange: |
||
| 85 | <pre> |
||
| 86 | Host dul |
||
| 87 | HostName 169.254.1.10 |
||
| 88 | KexAlgorithms diffie-hellman-group1-sha1 |
||
| 89 | Ciphers 3des-cbc |
||
| 90 | </pre> |
||
| 91 | |||
| 92 | and then log in as the 'rbs' user with 'rbs' password. |
