The VL-EPHs-S1 expansion module utilises the SUMIT interface standard developed by the SFF-SIG™. Based on the new SUMIT-micro™ format, the VL-EPHs-S1 mezzanine card is 1/3 the width (90 mm x 32 mm) of standard PC/104™ modules (90 mm x 96 mm). SUMIT-micro boards attach to the SUMIT connector and are secured via two mounting holes using standard standoffs.

The VL-EPHs-S1 expansion module provides SATA signals via the PCIe lane of the SUMIT-A connector. The on-board SATA controller supports two SATA drives in normal, RAID 0 (Fast), or RAID 1 (Safe) configuration. The two standard latching SATA connectors are compatible with traditional rotating drives, as well as solid-state SATA drives. An on-board BIOS extension enables booting from SATA devices. Standard drivers are available for compatibility with most x86 operating systems including Windows, Windows Embedded, Linux, VxWorks, and QNX. The VL-EPHs-S1 is designed for full industrial (-40º to +85ºC) temperature operation, is IPC-A-610 Class 2 and RoHS compliant, and meets MIL-STD-202G specifications for mechanical shock and vibration for use in harsh environments.