Polycom SpectraLink RCO400 - Manual (Page 45)

System Installation
PN: 1725-36122-001_N.doc 45
Fully Loaded Primary Shelf
Install Expansion Shelf Controllers (CSC300)
Slide the Expansion Shelf Controller Card into slot 2 of each shelf (2
through 20), until the card clicks into place. Tighten the screws at the
top and bottom of the card to secure it.
Slide the Interface Modules into slots 3 through 12 of each shelf (2
through 20) until the card clicks into place.