Nortel Networks Passport 4400 - Manual (Page 71)

Installing Expansion (Data and Voice) Modules Passport 4400 Hardware Installation Module
6-5
Spacers
Spacers are attached to the inside of the front of the 4400. They are used to secure
the expansion modules inside the unit.
Figure 6-4. Spacers
Blank Back Panels
Any open space not occupied by a module must contain a blank back panel. Blank
back panels ensure proper air flow over installed module, keep excessive dirt and
contamination out of the unit, and ensure compliance with radiated emissions
standards. Remove the blank back panels to accommodate new modules, and
reinstall a blank back panel if a module is removed.
Figure 6-5. Installation or Removal of Blank Back Panels
Blank Back
Panel