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DUL 20 » History » Version 14

laforge, 11/03/2020 03:25 PM
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1 1 laforge 
h1. DUL 20
2 





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DUL is a Digital Unit for LTE.  It contains the eNodeB function down to the baseband processing.





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{{thumbnail(DUL20_01_front_complete.jpg, size=900)}}





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{{>toc}}





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h2. Connectors





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h3. PWR





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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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The connectory type is https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts.





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{{thumbnail(DUL20_01_DC_in_detail.jpg, size=400)}}





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h3. GPS (RJ45)





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Connection for an Ericsson GPS module, contains 1PPS and UART signals





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{{thumbnail(DUL20_01_LMTA_GPS_detail.jpg, size=400)}}





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h3. EC (RJ45)





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Environment Control? Probably some RS-485 to control fans, power management, UPS, ...





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h3. AUX (RJ45)





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?





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h3. LMT A (RJ45)





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A RS-232 on RJ45 for Local Maintenane use.  IT provides access to COLI (COmmand LIne).





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The pinout is shown below.  Please note it is *different from RBS3000!*, but identical to that of the [[DUG 20]]





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|_.RJ45|_.DB9|_.Name|





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|1|5|GND|





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|2|3|TXD (of PC)|





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|3|2|RXD (of PC)|





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The [default?] baud rate settings are 9600 8N1.





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This port provides RS-232 access to the [[OSE]] shell





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h3. LMT B (RJ45)





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_Site LAN_ Ethernet, for adminstrative purpose





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This is the interface used for configuration of the DUL during installation.





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{{thumbnail(DUL20_01_LED_TNA_LMTB_detail.jpg, size=400)}}





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h3. TN A (RJ45)





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_Transmission_ Ethernet, i.e. the back-haul interface for S1. RJ-45





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h3. TN B (SFP)





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_Transmission_ Ethernet for optical back-haul. Can use normal SFP modules.





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{{thumbnail(DUL20_01_TNB_IDL_detail.jpg, size=400)}}





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h3. IDL (HSIO)





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Inter-DU-Link for cross-connecting multiple DU.





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h3. RI A..F (SFP)





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Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU.





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{{thumbnail(DUL20_01_SFP_detail.jpg, size=400)}}





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h2. Overview Pictures





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{{thumbnail(DUL20_01_front_perspective.jpg, size=400)}}





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{{thumbnail(DUL20_01_left_perspective.jpg, size=400)}}





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{{thumbnail(DUL20_01_right_perspective.jpg, size=400)}}





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{{thumbnail(DUL20_01_back_perspective.jpg, size=400)}}





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{{thumbnail(DUL20_01_bottom_complete.jpg, size=400)}}





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h2. Accessing it





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h3. SSH via LMT-B





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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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You have to use the following SSH config to speak the ancient cipher/key-exchange:





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<pre>





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Host dul





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        HostName 169.254.1.10





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        KexAlgorithms diffie-hellman-group1-sha1





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        Ciphers 3des-cbc





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</pre>





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and then log in as the 'rbs' user with 'rbs' password.





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h2. Mass Storage





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The DUL20 has an internal CompactFlash slot. The slot is only accessible when disassembling the unit, removing the circuit board from the enclosure.





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It uses 2GB CFlash cards with no known partition table / format.








        
        

    














  

  
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