In an Allison 5-speed hydromechanical transmission,what prevents a downshift from 2nd gear into 1st when the road speed is too high?

Question

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The inhibitor valve in an Allison 5-speed hydromechanical transmission is designed to prevent a downshift into a lower gear, such as from 2nd to 1st, when the vehicle's road speed is too high. This helps to avoid potential damage to the transmission and engine by ensuring that shifts occur only at appropriate speeds.

In an Allison 5-Speed Hydromechanical Transmission,what Prevents a Downshift from 2nd