SBB I/O module
The platform has a variety of SBB I/O module options. Refer to the specific SBB I/O module documentation for details.
All SBB I/O modules are mechanically and electrically compliant to the SBB V2 specification.
The following figure shows a typical SBB I/O module.
Figure 1. 6Gb/s SAS EBOD module

The system can operate with one or two modules. If the enclosure is run with a single module, the other I/O module bay must be filled with a blank module. The presence of I/O modules is checked when the power is switched on. The enclosure will not power up if there are no I/O modules present. An alarm occurs when incompatible configurations are detected.
The enclosure chassis is keyed to prevent I/O modules from being inserted upside down.