User's Guide

3.8
External Interface
In this section:
3.8.1 RF Ports
3.8.2 Optical Port
3.8.3 DC Power and Ground Ports
3.8.4 RET Port
3.8.5 Debug/ Test Port
3.8.6 M aintenance Interface
3.8.1
RF Ports
The RU has four RF ports, which n71, n29, and n26 all use.
Physical interface 4.3-10
Electrical interface Impedance: 50 ohm
VSWR: 1.5
Other ■ Lightning protection circuit on the RU (Refer to Resistibility of Lightning)
■ IP65 is supported for the function of waterproof with connected cable.
No guarantee for waterproof when cable is loose contact or not connected.
The RU is shipped with a protective dust cap on all the RF connectors to protect against dust
and other small particles. The water ingress protection is not required for these caps.
3.8.2
Optical Port
The RU has one optical interface to connect to/ from DU by eCPRI, which supports up-link and down-link base
band data, clock and timing signals, and communication with the RU and antenna line device (ALD). The SFP is
not mounted in the RU at shipment and a need to be prepared by operator side. It can be changeable in the
field.
The eCPRI format is based on ORAN specification, and O&M support can be provided by the DU vendor.
Physical interface Fiber connector is type SM UPC LC in Opt cable
The FullAXS mini (Product number: 2061981) or the compatible connector is adopted as the
waterproof connector.
The product number of external cable plug is 2061980.
Electrical interface eCPRI: 10 Gb/ s at least. Electrical interface is compliant to INF-8074.
Other IP65 is supported for the function of waterproof with fitted cap or connected cable.
No guarantee for waterproof when cap or cable is loose contact or not connected.
RU Hardware Feature
External Interface
38
Release 1.0 · Issue 1, March 2021
Fujitsu and Fujitsu Customer Use Only