Advantech DVMB-554E - Manual (Page 35)

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2.11 Aux Line-In Connector (CN7)
The connector is for audio devices with a Line-in connector.
2.12 Serial ATA Interface (SA1, SA2)
In addition to the EIDE interface (up to two devices), the DVMB-554E
features a high performance serial ATA interface (up to 150 MB/s) which
eases cabling to hard drives with thin and long cables.