Daisy Chain, Power Delivery & Power Pass-Through

Use the peripheral Thunderbolt 3 port on LaCie 1big Dock SSD Pro for:

Direct connection to a device or display that is compatible with Thunderbolt 3 technology.
Daisy chaining devices and displays that are compatible with Thunderbolt 3 technology.
Connecting a laptop's USB-C power adapter in order to pass-through power to a laptop connected to 1big Dock's host Thunderbolt 3 port.

How to daisy chain

The peripheral Thunderbolt 3 port on 1big Dock SSD Pro can be used to daisy chain compatible Thunderbolt 3 peripherals, such as hard drives and monitors. If you have another Thunderbolt 3 storage device, make certain to connect it to the daisy chain before adding compatible displays or USB 3.1 (USB-C) devices. See below for an example of the order of devices in a Thunderbolt 3 daisy chain.

Computer with a Thunderbolt 3 port.
LaCie 1big Dock SSD Pro (connected to computer via host Thunderbolt 3 port).
LaCie d2 Thunderbolt 3 (connected to 1big Dock's peripheral Thunderbolt 3 port).
Second LaCie d2 Thunderbolt 3 (connected to first d2 via Thunderbolt 3 port).
LaCie Rugged SSD (connected to second d2 via Thunderbolt 3 port).

USB 3.1 (USB-C) devices can terminate a Thunderbolt 3 daisy chain and should always be the last device. It must be connected to the secondary Thunderbolt 3 port on the preceding device. (The USB 3.1 device will not be recognized if connected to the preceding device’s USB-C port.)

Important cable info: When connecting 1big Dock's peripheral Thunderbolt 3 port to a compatible device, use cables specifically constructed to support Thunderbolt 3.

Power delivery and power pass-through

1big Dock SSD Pro delivers power to your connected laptop and compatible peripheral devices.

No device connected to peripheral port
Host port	Peripheral port
45W	-

Device connected to peripheral port
Host port	Peripheral port
30W	15W

1big Dock SSD Pro must receive power via its power cable in order to deliver power to compatible devices.

LaCie is not responsible for devices that experience harm, damage, or malfunction when connected to LaCie 1big Dock SSD Pro.

Power pass-through

With power pass-through, you can attach a laptop's USB-C power supply to 1big Dock SSD Pro's peripheral Thunderbolt 3 port and let 1big Dock 'pass' power to the laptop connected to the host Thunderbolt 3 port.

USB-C power supply connected to 1big Dock SSD Pro peripheral port	Power passed through to 1big Dock SSD Pro host port
> 60W and < 85W	Up to 50W
≥ 85W	Up to 70W

The power passed through may be limited by the host computer.