SIIG JU-H30B11-S1: HDMI and Ethernet with a shared charge/sync socket review

A useful port map with two important shared functions

The SIIG JU-H30B11-S1 adds one HDMI monitor, Gigabit Ethernet, three USB-A connections and card access to a compatible USB-C computer. Its appeal is a compact wired desk or travel arrangement. The important planning details are less obvious than the connector count: the USB-C socket alternates between charging and data, and the two card slots operate one at a time.

This reference follows SIIG's exact USB-C Multi-Function 4K HDMI Video Mini Dock with PD Charging and the original 04-1073A guide. The word “mini” describes the dock, not a Mini DisplayPort connector. The video output is HDMI, and a similarly named later SIIG dock should not inherit this model's specifications.

Choose a role for the USB-C socket

The guide labels the downstream USB-C connection “PD/Sync.” Connect a suitable USB-C power source there to power or charge the notebook, or connect a USB-C device for data transfer. These are alternative uses of one physical socket. A charger occupying it leaves no separate ordinary C data output for an SSD.

In its data arrangement, the dock provides the three USB-A ports plus that USB-C data socket at up to 5Gbps signalling. With the socket reserved for PD input, the three USB-A data outputs remain. The shared upstream link and attached devices determine real transfer results; the port ratings are not independent measured throughput guarantees.

One native HDMI display

HDMI supports up to 3840 ×2160 at 30Hz. The host USB-C port must transmit a DisplayPort signal, as the manual explicitly explains. Its system requirements call for both DisplayPort and USB Power Delivery capability on the host connection. An ordinary data-only USB-C port is not a sufficient substitute for the video arrangement.

This is a single-output native display dock. It does not establish two independent external desktops or a software USB graphics workaround. SIIG's retained operating-system references include Windows 11, 10 and 8.x, plus historical OS X10.10 through 10.12. The historical Mac wording does not establish unnamed Apple Silicon chips.

Card slots are alternatives, not a parallel reader pair

SD and microSD slots support the stated SDHC/SDXC and UHS-I card families, with capacity listed up to 2TB. The original guide explicitly says to connect either an SD card or a microSD card at one time. A workflow that needs simultaneous ingestion from a camera card and a microSD recorder therefore exceeds the documented arrangement.

For one card at a time, the integrated reader avoids carrying a separate adapter. Do not infer card transfer speed from the 5Gbps USB headline: card media, its supported mode and the shared connection still matter. The physical presence of both slots does not establish independent readers operating together.

Two kinds of power input serve different purposes

The PD source connection is rated up to 60W input, with net notebook delivery left unspecified here. There is also an auxiliary 5V power jack for external power when needed. SIIG specifies a 3.5mm outside diameter, 1.5mm inside diameter, 10mm plug length and center-positive polarity for that optional adapter.

The external adapter is not included. Its auxiliary role should not be confused with delivering notebook Power Delivery through the shared USB-C input. An older package containing only the mini dock and reference guide is consistent with the documented package, so verify the separately needed power equipment before assembling the desk.

Where it fits

The dock has an attached approximately 4.7in host cable, measures 4.45 ×0.83 ×2.24in and weighs 0.19lb. Gigabit Ethernet provides the wired network connection, while the HDMI socket can handle a suitable 4K30 screen. There are enough ordinary USB-A sockets for a modest set of peripherals without a large powered docking body.

Choose it when that exact single-screen layout fits and when one card at a time is acceptable. Decide whether the C socket will charge the notebook or serve a data device before counting available outputs. Keeping those two shared functions visible gives a much more accurate picture than treating every printed feature as simultaneously available.