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laforge, 05/14/2020 09:32 AM
DUL 20¶
DUL is a Digital Unit for LTE. It contains the eNodeB function down to the baseband processing.
- Table of contents
- DUL 20
Connectors¶
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.
GPS (RJ45)¶
Connection for an Ericsson GPS module, contains 1PPS and UART signals
EC (RJ45)¶
Environment Control? Probably some RS-485 to control fans, power management, UPS, ...
AUX (RJ45)¶
?
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
LMT B (RJ45)¶
Site LAN Ethernet, for adminstrative purpose
TN A (RJ45)¶
Transmission Ethernet, i.e. the back-haul interface for S1. RJ-45
TN B (SFP)¶
Transmission Ethernet for optical back-haul. Can use normal SFP modules.
IDL (HSIO)¶
Inter-DU-Link for cross-connecting multiple DU.
RI A..F (SFP)¶
Radio Interface (CPRI) using either SFP transceivers for RRU connection or copper interconnect cables for RU.
Overview Pictures¶
Accessing it¶
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:
Host dul HostName 169.254.1.10 KexAlgorithms diffie-hellman-group1-sha1 Ciphers 3des-cbc
and then log in as the 'rbs' user with 'rbs' password.
Updated by laforge about 4 years ago · 9 revisions