A local collision occurs when two or more nodes transmit at the same time. If two nodes collide on the other side of a repeater, the instrument counts this as a Remote Collision. Local Collisions and Remote Collisions are only reported at 10 Mbps.
On a 10BASE-T network, Excessive collisions are most often caused by a physical media problem such as missing or incorrect terminators, impedance discontinues (such as, defective connecters, cable stubs, crushed cables), or defective network interface cards.
In other words, I suspect that you have a 10Mbps hub in the middlw or replace the cable.
Hope this helps.