IBM DS4800 - Replacing a power supply and fan unit

Installing SFPs and fiber-optic cables
Each RAID controller unit has four single-ported host channels and two dual-ported
drive channels. SFPs are inserted into the ports, and then fibre-channel cables are
connected to the SFPs.
For information on installing SFPs and fiber-optic cables, see “Working with SFPs
and fiber-optic cables” on page 47.
158 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide