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SIU 02 » History » Revision 3

Revision 2 (laforge, 07/04/2020 01:17 PM) → Revision 3/8 (laforge, 07/04/2020 01:19 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. 

 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 

 

 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. 
 
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