Juniper MX2020 Hardware Manual page 263

242
Figure 86: Installing a Four-Post Mounting Shelf
NOTE: The two rear flanges on the four-post mounting shelf are adjustable from 24in
(60.96cm) to 30.6in (77.72cm) to accommodate different types of racks rails. If you need
to extend the depth of the rack, you can purchase an extended mounting kit
(MX2K-TRAY-XTND-S). The kit contains rack mount tray brackets that have an adjustable
range from 30in (76.2cm) to 36.6in (92.9cm). Figure 87 on page 243 illustrates how to
install an extended rack.