The Nod turret is an anti-tank structure. It is a 105mm cannon using armour piercing (AP) rounds and is mounted on a concrete pedestal with a 360 degree fire zone, designed to compensate GDI's armour advantage.
In Command & Conquer 95: Tiberian Dawn, the turret is Nod's ground defense structure but it is biased more towards an anti-vehicle role. It may operate without power.