Service manual

Glossary-6 Sun Ultra 2 Series Service Manual • July 1996
Slavio Slave I/O. Provides most of the Sunness I/O requirements. Contains serial
ports, floppy control, and extended bus (EBus) control.
SC_MP Multiprocessing system controller.
S/N Signal-to-noise.
SunVTS Sun validation and test suite applications. A diagnostic tool designed to test
Sun hardware.
sync (1) The process of synchronizing the scanning of receiving, processing, or
display equipment with a video source. (2) A signal comprising the horizontal
and vertical elements necessary to accomplish synchronization. (3) The
component of a video signal that conveys synchronizing information.
synchronous Under control of a clock or timing mechanism.
SYSIO System I/O controller. Provides an electrical bridge between the UPA and the
SBUS.
System unit The part of a workstation that contains the central processing unit (CPU), the
disk, and other devices essential to operate the system.
TCP/IP Transport control protocol/interface program. The protocol suite originally
developed for the Internet. It is also called the Internet protocol suite.
Thinnet Also known as 10BASE2, an Ethernet technology that evolved as a more cost
effective method of computer interconnection than 10BASE5. A 10BASE2
network has a data transfer rate of 10 megabits per second and uses a thinner
cable, but supports individual network segments of only 185 meters (607
yards).
TOD Time-of-day clock chip. A clock chip that contains the system date and time
(year-month-day-hour-minutes).
TPE Twisted-pair Ethernet. Provides 10-Mbps or 100-Mbps networking.
TTL Transistor-transistor logic. A digital system semiconductor logic gate circuit
design comprised of multiple emitter input transistors, a unique dual-mode
coupling transistor, and a transistor totem pole output.
UPA Ultra port architecture.
UART Universal asynchronous receiver-transmitter. A device that contains both the
receiver and transmitter circuits required for asynchronous serial
communications.
VIS Visual instruction set.
VOM Volt-ohm-milliammeter. A multifunction, multirange instrument for
troubleshooting and maintaining electrical and electronic equipment. It
measures voltage, current, and resistance. Also called a multimeter.