A centralized, one-size-fits-all answer is not the way to go. I would prefer that each department have a budget, however large or small, designated for such needs. No one knows their needs nd how to meet them better than those who walk-the-walk.
Needs are the driving forces for the development of technologies. If we don't identify and subsequently address the typical needs of the department by adopting right technology it will be a futile exercise. However by having tie-ups and networking with top notch institutes of national and international repute will help share the resources and facilities. Indigenous development of technology will help a lot in meeting own needs and will facilitate self help and will keep the manpower up on their toes to meet and sustain the challenging environment created by continuously changing socio-economic and technological conditions.
Educational technology planning should happen AFTER curriculum planning. We plan the curriculum and the learning outcomes of each class, and then we determine what technology (if any) can allow students to achieve these outcomes.
Some technologies CAN apply across all disciplines, such as a uniform learning management system. Some apply to only one discipline, like the automation system used by students at the student radio station at my school.
One size does not fit all, but every department doing something different also is not effective. Collaborative strategic planning can find the dividing line between the two, and then funding must follow.