Apple PowerBook Duo Dock (including Duo Dock Plus) - Manual (Page 13)

5 Now connect any other equipment you have, such as an external hard disk drive
or printer.
Follow the instructions that came with the equipment.
If you are connecting a SCSI device, you’ll need an HDI-30 SCSI System
Cable to attach it to the dock.
If you have a hard disk installed in your Duo Dock, you can chain up to five
additional SCSI devices to your PowerBook Duo System. If you do not have a
hard disk installed in your Duo Dock, you can chain up to six devices.
6 If you will be using network services, connect your LocalTalk (or other network) cable.
Follow the instructions that came with the cable, or check with your network
administrator. If you will be connecting your Duo Dock Plus (or upgraded
Duo Dock) to an Ethernet network, you need to connect the dock to the
Ethernet network and check that your PowerBook Duo has the correct
networking software. See Chapter 2 of this guide for details.
Once you have connected all your equipment, the Duo Dock is ready to use.
7 Using the PowerBook Duo Dock