DUL 20 » History » Revision 12
Revision 11 (laforge, 08/09/2020 03:09 PM) → Revision 12/15 (laforge, 11/03/2020 03:24 PM)
{{>toc}} h1. DUL 20 DUL is a Digital Unit for LTE. It contains the eNodeB function down to the baseband processing. {{thumbnail(DUL20_01_front_complete.jpg, size=900)}} {{>toc}} h2. Connectors h3. PWR 48V DC connector. The negative rail is towards the edge of the unit. Also seems to power up fine at 36V The connectory type is https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts. {{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}} h3. GPS (RJ45) Connection for an Ericsson GPS module, contains 1PPS and UART signals {{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}} h3. EC (RJ45) Environment Control? Probably some RS-485 to control fans, power management, UPS, ... h3. AUX (RJ45) ? h3. LMT A (RJ45) A RS-232 on RJ45 for Local Maintenane use. IT provides access to COLI (COmmand LIne). The pinout is shown below. Please note it is *different from RBS3000!*, but identical to that of the [[DUG 20]] |_.RJ45|_.DB9|_.Name| |1|5|GND| |2|3|TXD (of PC)| |3|2|RXD (of PC)| The [default?] baud rate settings are 9600 8N1. This port provides RS-232 access to the [[OSE]] shell h3. LMT B (RJ45) _Site LAN_ Ethernet, for adminstrative purpose This is the interface used for configuration of the DUL during installation. {{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}} h3. TN A (RJ45) _Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45 h3. TN B (SFP) _Transmission_ Ethernet for optical back-haul. Can use normal SFP modules. {{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}} h3. IDL (HSIO) Inter-DU-Link for cross-connecting multiple DU. h3. RI A..F (SFP) Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU. {{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}} h2. Overview Pictures {{thumbnail(DUL20_01_front_perspective.jpg, size=400)}} {{thumbnail(DUL20_01_left_perspective.jpg, size=400)}} {{thumbnail(DUL20_01_right_perspective.jpg, size=400)}} {{thumbnail(DUL20_01_back_perspective.jpg, size=400)}} {{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}} h2. Accessing it h3. SSH via LMT-B 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. You have to use the following SSH config to speak the ancient cipher/key-exchange: <pre> Host dul HostName 169.254.1.10 KexAlgorithms diffie-hellman-group1-sha1 Ciphers 3des-cbc </pre> and then log in as the 'rbs' user with 'rbs' password.
