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
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.
Sabrent HB-MAC3 - Hub - 4 x SuperSpeed USB 3.0 - desktop
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.
The TL-SG1016D 16-port Gigabit Ethernet switch provides you with a high-performance, low-cost, easy-to-use, seamless and standard upgrade to improve old network to 1000Mbps network.
features a non-blocking wire-speed architecture with a 4.8Gbps switching capacity, for maximum data throughput and an integrated universal power supply.
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.
NETGEAR's GS116 Gigabit Ethernet Switch lets you build a system that provides a full, dedicated 1000 Mbps connections so you can move very large files across your network instantly.
Add 7 external, wall/DIN rail mountable USB 2.0 ports from a single USB connection
TP-LINK JetStream TL-SG5412F - Switch - managed - 12 x SFP + 4 x combo 1000Base-T - rack-mountable
D-Link Web Smart DGS-1210-52 - Switch - managed - 48 x 10/100/1000 + 4 x Gigabit SFP - desktop, rack-mountable
D-Link DGS 1024A - Switch - unmanaged - 24 x 10/100/1000 - desktop, wall-mountable
Add 8 DIN Rail-mountable RS232 Serial ports to any system through USB
Cisco Systems is the worldwide leader in networking for the Internet. Cisco's networking solutions are the foundation of the Internet and most corporate, education, and government networks around the world.
An IP load balancer that provides comprehensive failover capabilities in case of server failure, distribution of traffic across multiple servers and integrated protection from network intrusions.
D-Link xStack DGS-3450 - Switch - managed - 48 x 10/100/1000 + 4 x shared SFP - desktop
A 4-port RS-232 serial hub with DB9 connectors and USB interface.