Network switches route packets between ports at the OSI layer 2, which means that (in Ethernet) the switches decide where incoming packets are transferred to, based on the NIC's 48-bit address.

Specialty communication devices use specialized or proprietary interfaces or technologies

Communication tower erection services build communication towers, set up satellite dishes and install related communications equipment

Medical equipment, services and supplies are used in medical, dental, hospital, pharmacy, and clinical laboratory applications

Automated test equipment (ATE) is used to monitor and control test and measurement devices, keeping human interaction at a minimum

Serial communication products are used in industrial and commercial systems to transmit data bit-by-bit, or sequentially, over a single wire.

Radios are communication systems that send and/or receive electromagnetic waves.