3 way lighting wiring problem

[Anonymous]

I replace my old 3-way switch that control my stairway lighting. The unit works only on when the upstairs 3-way switch is activated downward that i can put off the light down stairs, dut the upstairs switch in the upward direction ,i cannot put-on the light downstairs.
I need at lease a diagram showing what i expect to do on the 3 terminal of the switch that may give an idea where i misplace the original wiring.
I would appreciate the help.

Thank

Cris