SIU 02 » History » Revision 7
Revision 6 (laforge, 07/19/2020 06:48 PM) → Revision 7/8 (laforge, 10/17/2020 05:17 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?| There is a OSHW design for a breakout-board with RS-422 transceivers so you get a CMOS level 1PPS input and output: https://git.osmocom.org/osmo-small-hardware/tree/siu-clock-breakout 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. h3. Further reading {{child_pages}}
