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SIU 02 » History » Version 3

laforge, 07/04/2020 01:19 PM

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h1. SIU 02
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The SIU (Site Integration Unit) is an optional element in the transport network of the Ericsson 2G RAN.
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It includes functionalities like
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* 16 E1/T1 lines
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* 8 Gigabit Etghernet ports (up to 8x copper, up to 4x optical/SFP)
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* Ability to route IP/Ethernet traffic over E1
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* Ability to convert from Abis/E1 or PacketAbis/E1 to Ericsson PacketAbis/IP (L2TP)
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* Synchronization for E1
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** from SyncE
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** from IEEE PTP
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** from 1PPS input
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h2. Connectors
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h3. POWER
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The DC input voltage of nominal 24..48V can be applied in any polarity.
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h3. CONSOLE
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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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h3. CLOCK
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This is a 10P10C western connector, sometimes also called RJ50.
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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.
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The pinout is as follows
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|_.Pin|_.Signal|_.Function|
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|1|RS422-C Non-Inverting input||
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|2|RS422-C Inverting input||
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|3|RS422-B Non-Inverting input|?!?|
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|4|RS422-B Non-Inverting input|1PPS IN?|
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|5|RS422-B Inverting input|1PPS IN?|
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|6|?||
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|7|RS422-A Non-Inverting output|1PPS OUT|
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|8|RS422-A Inverting output|1PPS OUT|
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|9|GND||
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|10|+12V DC output|Supply external GPS?|
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h3. E1/T1
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This is a  block of 8 RJ45 connectors, each hosting two E1/T1 circuits.
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Pin-out TBD.
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h3. Ethernet 
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This is a block of 8 RJ45 conncetors, each supporting one 10/100/1000 Mbps Ethernet port.
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Four of the Ethernet connectors can alternatively be used with a SFP optical transceiver.
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