Chapter 1.Overview                                                                                 
1.1 Introduction 
This document provides backplane specific information including the features, jumper settings, 
and pin definitions of 12Gb/s 4-port mini-SAS HD backplane, which is not compatible with the 
previous version of SR301 chassis with screw-installed 3.5” HDD trays. 
Moreover, it also lists down Chenbro worldwide technical contacts, so the user can contact our 
experienced field application engineers via either a phone call or email. 
1.2 Chassis Revision 
The SR301 chassis has been modified to support both tool-less 3.5” HDD tray and PCI-e 3.0 slot, 
and  this feature-advanced  chassis  is named  as  SR301  Plus  (SR301+).  There  is  a  sticker  on 
chassis bottom with the information of chassis revision and manufacturing code, which are must 
for technical support.