A sending station (computer or network switch) may be transmitting data faster than the other end of the link can accept it.

Modern wired networks use a network switch to eliminate collisions.

Lines patched as data ports into a network switch require simple straight-through patch cables at each end to connect a computer.

This requires integration with network switch manufacturers, firewall vendors, and vendors who design management consoles to create infrastructure that supports encrypted roaming communication.

A useful analogy: one can regard an expander as akin to a network switch in a network, which connects multiple systems using a single switch port.