Bay Networks 5393 Hardware Installation Manual page 49

Chapter 2 Installing the Remote Annex 5393/PRI
Figure 2-2. Inserter/Extractor Lever
4 Align the top and bottom edges of the module in the card guides of
the target slot(s), and push the module into the chassis until the
inserter/extractor levers just engage the front edges of the chassis
(see Figure 2-3).
Remote Annex 5393/PRI Hardware Installation Guide 2-7