DUL 20 » History » Revision 4
Revision 3 (laforge, 09/06/2019 04:17 PM) → Revision 4/15 (tnt, 09/06/2019 04:18 PM)
{{>toc}}
h1. DUL 20
DUL is a Digutal Unit for LTE. It contains the eNodeB function down to the baseband processing.
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
h3. GPS (RJ45)
Connection for an Ericsson GPS module, contains 1PPS and UART signals
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!*
|_.RJ45|_.DB9|_.Name|
|1|5|GND|
|2|3|TXD (of PC)|
|3|2|RXD (of PC)|
The [default?] baud rate settings are 9600 8N1
h3. LMT B (RJ45)
_Site LAN_ Ethernet, for adminstrative purpose
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.
h3. IDL (HSIO)
Inter-DU-Link for cross-connecting multiple DU.
h3. RI A..F (SFP) (SPF)
Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU.
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.
