Hi,

A JTO is a Group-B Officer. The duties and responsibilities of a JTO are different for different sections.

For example, a JTO Outdoor is responsible for new connection provision.

A JTO EB deals with enterprise customers.

You can check more details about this here-> https://www.quora.com/What-does-a-JTO-of-BSNL-do-at-work-How-hard-is-the-exam

Hope this helps.