Avaya DECT R4 Installation And Administration Manual page 573

Installing the Elise 3 Server (AIWS2 Hardware)
2. Fasten the assembly brackets in the rack.
Figure 196: Front mounting single rack 2
Front mounted double (requires the Standard 19" rack kit)
1. Use the supplied assembly brackets and fasten the two modules together, both on the rear
side and on the bottom side, as shown in the two figures below:
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Avaya DECT R4 - Installation and Maintenance Guide 02/2016