Turn a single USB 2.0 port into 4 external USB 2.0 ports
Add an RS232 serial port with COM retention to your laptop or desktop computer through USB
Add four external SuperSpeed USB 3.0 ports from a single USB connection
Sabrent HB-MAC3 - Hub - 4 x SuperSpeed USB 3.0 - desktop
4 Port Aluminum USB 2.0 Hub for Mac boasts an elegant aluminum design to match the style and color of all your Mac devices. Add up to 4 peripherals quickly and easily with the Sabrent 4-Port USB 2.0 Hub.
Add four USB 3.0 ports to your laptop or Ultrabook using this slim, portable hub with an extended-length cable
IOGEAR's 4-Port USB 2.0 Hub provides 4 Hi-Speed USB 2.0 ports for your USB connectivity needs. This device is USB 2.0 compliant and provides a high-speed data transfer rate.
D-Link xStack DGS-3450 - Switch - managed - 48 x 10/100/1000 + 4 x shared SFP - desktop
Stacking cable for Extreme Networks' Summit 400 series with 3.0M in length.
D-Link xStack DGS-3120-48TC - Switch - managed - 44 x 10/100/1000 + 4 x combo SFP - desktop
The DES-1210-28 Web Smart switch with advanced management functions including SNMP, Web Management, SmartConsole Utility, and compact command lines provides a complete and affordable solution for small and medium businesses.
Connect power and Gigabit Ethernet data to 8 PoE-enabled devices, with 30W per-port output - Wall Mountable
Reliable alternative to serial cards that offers an easy solution for adding COM ports to a laptop, thin client or legacy-free PC to connect serial and USB peripheral devices.
Linksys LGS108P - Switch - unmanaged - 4 x 10/100/1000 (PoE+) + 4 x 10/100/1000 - desktop, wall-mountable - PoE+ (50 W) - AC 100/230 V
An 8-port RS-232/422/485 serial hub with DB9 connectors.
Cisco Jumper - Power cable - IEC 60320 C13 to IEC 60320 C14 - 10 ft - for Catalyst 3560E, 3560G, 3560V2, 3750E, 3750V2
StarTech.com 5 Port Industrial Gigabit Ethernet Switch - DIN / Wall-Mount - Switch - 5 x 10/100/1000 - desktop, DIN rail mountable, wall-mountable - DC power
The USB3SEXT5DSK Desktop USB 3.0 Extension Cable connects to an available USB female port on a Mac or PC computer, allowing you to relocate the USB (female) port up to 5-feet away from the computer case.
Plugable USB3-HUB7BC - Hub - 7 x SuperSpeed USB 3.0 - desktop
Connect Gigabit Ethernet data and power to 4 PoE-enabled devices, with 2 additional GbE ports - DIN/Wall Mountable. The IES61002POE 6-Port Industrial PoE+ switch lets you connect Gigabit Ethernet data and power to four PoE-enabled devices.
StarTech.com 5 Port Unmanaged Industrial Gigabit PoE Switch with 4 Power over Ethernet ports - Switch - unmanaged - 4 x 10/100/1000 (PoE) + 1 x 10/100/1000 - wall-mountable - PoE (62 W)