Dell POWEREDGE 1955 - Manual (Page 71)

Installing System Options
71
I/O Module Placements
The back panel has four bays for I/O modules and are labeled IO/1, IO/2, IO/3, and IO/4 (see Figure 1-5).
PowerConnect 5316M Ethernet switch modules or Ethernet pass-through modules must be installed in
either bay IO/1 or IO/2. All other types of matching I/O modules can be installed in IO/3 and IO/4. See "
Guidelines for Installing Connectivity Modules" in "Indicators, Messages, and Codes" for guidelines on
installing I/O modules.
Bays IO/1 and IO/3 are primary bays and bays IO/2 and IO/4 are secondary bays. The secondary bays
provide redundancy or additional connectivity, if desired. If only one type of I/O module is installed, it
must be installed in the primary bay.
Removing an I/O Module
1 Disconnect any cables attached to the I/O module.
2 Press in the bottom of the release tab and pull out the release lever. See Figure 3-10.
3 Pull out the release lever and slide the I/O module out of the chassis.
4 If you are removing the I/O module permanently:
a If the I/O module uses a supporting daughter card, uninstall the card from inside the server
module(s). See "Removing a Daughter Card" on page 83.
NOTICE:
You must install a filler bracket over an empty I/O module slot to maintain Federal Communications
Commission (FCC) certification of the system. The brackets also help keep dust and dirt out of the system and aid in
proper cooling and airflow inside the system.
b Install a metal filler bracket over the empty slot opening.