SIU 02 » History » Version 7
laforge, 10/17/2020 05:17 PM
| 1 | 1 | laforge | h1. SIU 02 |
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| 2 | |||
| 3 | The SIU (Site Integration Unit) is an optional element in the transport network of the Ericsson 2G RAN. |
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| 4 | |||
| 5 | It includes functionalities like |
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| 6 | * 16 E1/T1 lines |
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| 7 | * 8 Gigabit Etghernet ports (up to 8x copper, up to 4x optical/SFP) |
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| 8 | * Ability to route IP/Ethernet traffic over E1 |
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| 9 | * Ability to convert from Abis/E1 or PacketAbis/E1 to Ericsson PacketAbis/IP (L2TP) |
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| 10 | * Synchronization for E1 |
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| 11 | ** from SyncE |
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| 12 | ** from IEEE PTP |
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| 13 | ** from 1PPS input |
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| 14 | |||
| 15 | |||
| 16 | h2. Connectors |
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| 17 | |||
| 18 | h3. POWER |
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| 19 | |||
| 20 | 4 | laforge | 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. |
| 21 | 1 | laforge | |
| 22 | 2 | laforge | h3. CONSOLE |
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| 24 | 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 |
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| 25 | |||
| 26 | 5 | laforge | It is configured to a fixed IP address of 192.168.1.1/24 and provides telnet + SSH access. |
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| 28 | The default user name is @admin@; the default password is @hidden@. |
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| 29 | |||
| 30 | You will get access to a command line interface: |
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| 31 | <pre> |
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| 32 | Trying 192.168.1.1... |
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| 33 | Connected to 192.168.1.1. |
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| 34 | Escape character is '^]'. |
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| 35 | |||
| 36 | login: admin |
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| 37 | Password: |
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| 38 | STN CLI - ready |
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| 39 | OSmon> |
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| 40 | </pre> |
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| 41 | |||
| 42 | 1 | laforge | h3. CLOCK |
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| 44 | This is a 10P10C western connector, sometimes also called RJ50. |
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| 45 | |||
| 46 | 2 | laforge | 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. |
| 47 | 1 | laforge | |
| 48 | The pinout is as follows |
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| 49 | |||
| 50 | |_.Pin|_.Signal|_.Function| |
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| 51 | |1|RS422-C Non-Inverting input|| |
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| 52 | |2|RS422-C Inverting input|| |
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| 53 | |3|RS422-B Non-Inverting input|?!?| |
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| 54 | |4|RS422-B Non-Inverting input|1PPS IN?| |
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| 55 | |5|RS422-B Inverting input|1PPS IN?| |
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| 56 | |6|?|| |
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| 57 | |7|RS422-A Non-Inverting output|1PPS OUT| |
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| 58 | |8|RS422-A Inverting output|1PPS OUT| |
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| 59 | |9|GND|| |
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| 60 | |10|+12V DC output|Supply external GPS?| |
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| 61 | 3 | laforge | |
| 62 | 7 | laforge | 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 |
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| 64 | 3 | laforge | h3. E1/T1 |
| 65 | |||
| 66 | This is a block of 8 RJ45 connectors, each hosting two E1/T1 circuits. |
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| 67 | |||
| 68 | Pin-out TBD. |
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| 69 | |||
| 70 | h3. Ethernet |
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| 71 | |||
| 72 | This is a block of 8 RJ45 conncetors, each supporting one 10/100/1000 Mbps Ethernet port. |
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| 73 | |||
| 74 | Four of the Ethernet connectors can alternatively be used with a SFP optical transceiver. |
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| 75 | 6 | laforge | |
| 76 | h3. Further reading |
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| 77 | |||
| 78 | {{child_pages}} |
