SIU 02 » History » Revision 5
Revision 4 (laforge, 07/04/2020 01:30 PM) → Revision 5/8 (laforge, 07/04/2020 02:02 PM)
h1. SIU 02
The SIU (Site Integration Unit) is an optional element in the transport network of the Ericsson 2G RAN.
It includes functionalities like
* 16 E1/T1 lines
* 8 Gigabit Etghernet ports (up to 8x copper, up to 4x optical/SFP)
* Ability to route IP/Ethernet traffic over E1
* Ability to convert from Abis/E1 or PacketAbis/E1 to Ericsson PacketAbis/IP (L2TP)
* Synchronization for E1
** from SyncE
** from IEEE PTP
** from 1PPS input
h2. Connectors
h3. POWER
The DC input voltage of nominal 24..48V can be applied in any polarity. It uses the same connector like e.g. the [[DUL 20]] or [[DUG 20]] units.
h3. CONSOLE
This is an RJ45 Ethernet port, internally connected to a "BCM5221 Fast Ethernet PHY":https://www.broadcom.com/products/ethernet-connectivity/copper-phy/fe-phy/bcm5221
It is configured to a fixed IP address of 192.168.1.1/24 and provides telnet + SSH access.
The default user name is @admin@; the default password is @hidden@.
You will get access to a command line interface:
<pre>
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
login: admin
Password:
STN CLI - ready
OSmon>
</pre>
h3. CLOCK
This is a 10P10C western connector, sometimes also called RJ50.
Internally, it connects to some protection circuitry and then to a series of three "ST2485EC":https://www.st.com/resource/en/datasheet/st3485ec.pdf RS-422 transceivers.
The pinout is as follows
|_.Pin|_.Signal|_.Function|
|1|RS422-C Non-Inverting input||
|2|RS422-C Inverting input||
|3|RS422-B Non-Inverting input|?!?|
|4|RS422-B Non-Inverting input|1PPS IN?|
|5|RS422-B Inverting input|1PPS IN?|
|6|?||
|7|RS422-A Non-Inverting output|1PPS OUT|
|8|RS422-A Inverting output|1PPS OUT|
|9|GND||
|10|+12V DC output|Supply external GPS?|
h3. E1/T1
This is a block of 8 RJ45 connectors, each hosting two E1/T1 circuits.
Pin-out TBD.
h3. Ethernet
This is a block of 8 RJ45 conncetors, each supporting one 10/100/1000 Mbps Ethernet port.
Four of the Ethernet connectors can alternatively be used with a SFP optical transceiver.