A tier 4 data center Singapore would be best described as an enterprise class data center tier having dual-powered and outmoded instances of storage, servers, network links, and power cooling equipment. It has been the highly advanced type of data center tier where redundancy has been applied across the entire data center for both computing and non-computing infrastructure.
A Tier 4 data center has also been known as a Level 4 data center. The data center would combine and exceed features and capabilities of all preceding data center layers. They would provide you with end-to-end fault resistance by maintaining and developing the entire data center infrastructure duplicates.