Dell Precision 3551 Setup and specifications guide

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Ports and connectors

Table 1. External ports and connectors
The following table lists ports and connectors available on Precision 3551.
Description	Values
External:
Network	One RJ-45 port
USB	Two USB 3.2 Gen 1 (Type-A) port One USB 3.2 Gen 1 (Type-A) port with PowerShare One USB 3.2 Gen 2 (Type-C) port with DisplayPort 1.4 port/Power Delivery/Thunderbolt
Audio	One Universal Audio Jack
Video	One HDMI 2.0b port
Power adapter port	One 7.4 mm barrel-type power connector port/One Type-C power port
Security	One Wedge-shaped lock slot
Card slot	Micro SD card slot

Table 2. Internal ports and connectors
The following table lists ports and connectors available on Precision 3551.
Description	Values
Internal:
One M.2 Key-M (2280 or 2230) for solid-state drive One M.2 2230 Key-E for WLAN	One M.2 2230 slot for solid-state drive 128 GB/256 GB/512 GB One M.2 2280 slot for solid-state drive 256 GB/512 Gb/1 TB/2 TB One M.2 2280 slot for Self-Encrypting solid-state drive 256 GB/512 GB NOTE:To learn more about the features of different types of M.2 cards, search in the Knowledge Base Resource at Dell Support Site.