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

Connectors¶

POWER¶

The DC input voltage of nominal 24..48V can be applied in any polarity.

CONSOLE¶

This is an RJ45 Ethernet port, internally connected to a BCM5221 Fast Ethernet PHY

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 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?

E1/T1¶

This is a block of 8 RJ45 connectors, each hosting two E1/T1 circuits.

Pin-out TBD.

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.