One of my friends graduated from NIT Trichy and here are some details about the wifi and its availability around the campus.
First-year and third-year hostels have good wifi compared to second and fourth-year hostels. For the second floor, it’s amber, for the third floor it’s zircon, and for the fourth floor, it’s garnet. The WiFi speed is overall good. At night, the wifi speeds go up to 4 to 5 MBPS.