4 GLOSSARY
SC A fiber-optic cable connector. When it is pushed into place, the
connector is seated automatically.
STP Shielded twisted-pair. Shielded four-conductor electrical cable that
offers high-speed transmission for long distances.
SuperStack 3Com system of stackable hubs, servers, switches, routers, SDLC
converters, and power supplies. SuperStack systems can support a
range of LAN environments, including Ethernet, token ring, FDDI,
SNA, and ATM.
symmetric
flow control
A relationship between linked network devices in which both devices
can send and receive pause frames. Also called bidirectional flow
control. See also asymmetric flow control, flow control, pause frame.
twisted-pair Wiring similar to that found in the telephone system, consisting of two
insulated wires loosely twisted around each other to help cancel out
induced noise in balanced circuits.
UTP Unshielded twisted-pair. A cable consisting of two or more pairs of
twisted copper wires that are not shielded.
