StarTech.com US2GC30 · USB network adapter

MPN / P/N

US2GC30

Manufacturer designation

2.5GbE USB C to Ethernet Adapter NBASE-T NIC - USB 3.0 Type C 2.5/1 Gigabit/100 Mbps Multi Speed Network/ USB 3.1 Laptop to RJ45/LAN Thunderbolt 3 Compatible/MacBook Pro Surface

Manufacturer conditions

- Jumbo Frames are no longer supported in macOS

Power source

USB-Powered

Input voltage

5V DC

Output voltage

5 DC

Colour

Space Gray

Network adapter form factor

Attached Cable

Cable Length

5.3 in [13.5 cm]

Product length

9.6 in [24.5 cm]

Product width

1.1 in [27.0 mm]

Product height

0.7 in [17 mm]

Product weight

1.4 oz [41 g]

Operating temperature

0 to 70

Storage temperature

10 to ~ 55

Humidity

5% to 90 % RH (no condensation)

Type and rate

USB 5Gbps

Fibre type

Copper

Compatible networks

2.5G/1G/100Mbps/10Mbps

Auto MDIX

Yes

Full-duplex support

Yes

Jumbo-frame support — manufacturer limit

9K max.

Wake-on-LAN — manufacturer conditions

Yes

MTBF — not warranty duration

1,233,108 hours

Number of ports

1

Interface

RJ45 (Gigabit Ethernet)

Bus type

USB 5Gbps

Industry standards

IEEE 802.3i 10BASE-T; IEEE 802.3ab 1000BASE-T; IEEE 802.1q VLAN Tagging; IEEE 802.3x; IEEE 802.3u 100Base-TX; IEEE 802.3bz 2.5GBase-T

Chipset ID

Realtek - RTL8156BG

LED Indicators

1 - Green LED: 1Gbps/100Mbps/10Mbps; 1 - Blue LED: 2.5Gbps

Connector 1 (Quantity)

1

Connector 1

USB-C (5Gbps, 4.5W)

Connector 2 (Quantity)

1

Connector 2

RJ-45

Documented selection limits

Match the exact host interface, peripheral/device protocol, connector, firmware, OS/driver and power requirements before ordering. Published maximum rates are interface limits, not guaranteed application throughput. No universal device or current/future OS compatibility is implied. Match USB host generation and OS/driver support; USB bus bandwidth may limit Ethernet line-rate performance. Fiber/SFP variants require the correct transceiver/link partner, supplied modules must be checked. RJ45 Ethernet does not imply PoE output.

Specification source: StarTech.com ↗
Checked against documentation: 16.10.2026