442 Upgrade and Maintenance Manual  TX2550 M4
System board and components
Figure 317: Mounting positions on the system air duct
Ê The mounting position is located on the system air duct:
Ê Install the system air duct, see section "Installing the system air duct" on 
page 68.
1FBU 1
2 FBU 2 or Dual microSD 64GB Enterprise