Paradyne 3551 - Manual (Page 15)

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5. At the front of the carrier, hold the DSU vertically with the latch on its faceplate in
the open position. Then, insert the circuit card into the top and bottom circuit card
guides for the slot that contains the rear connector plate.
Slide the DSU into the slot, aligning the circuit card with the rear connector plate
until the connectors seat firmly into the back of the carrier. Press the faceplate latch
to secure the DSU into the carrier, rotate the circuit pack lock into the closed
position, and tighten the screw.
6. Return to the rear of the carrier and tighten the rear connector plate screw.