User manual

Appendix F: Glossary
94 Cobalt CacheRaQ 4 User Manual
Network Time Protocol (NTP)
A protocol built on top of the Transmission Control Protocol (TCP) that
synchronizes the time of a local computer client or server to radio clocks and
atomic clocks located on the Internet. This protocol is capable of
synchronizing distributed clocks within milliseconds over long time periods.
Some configurations include cryptographic authentication to prevent
accidental or malicious protocol attacks.
NTP
See Network Time Protocol (NTP).
Packet
The unit of data that is routed between an origin and a destination on the
Internet or any other packet-switched network. The packet includes a header
containing control information and (usually) user data. Packets are most
often used to refer to network layer units of data.
PCI
See Peripheral Component Interface (PCI).
Peripheral Component Interconnect (PCI)
Peripheral Component Interconnect (PCI) is an interconnection system
between a microprocessor and attached devices in which expansion slots are
spaced closely for high-speed operation. PCI is designed to be synchronized
with the clock speed of the microprocessor, in the range of 20 MHz to
33 Mhz.
PCI transmits 32 bits at a time in a 124-pin connection (the extra pins are for
power supply and grounding) and 64 bits in a 188-pin connection in an
expanded implementation. PCI uses all active paths to transmit both address
and data signals, sending the address on one clock cycle and data on the
next. Burst data can be sent starting with an address on the first cycle and a
sequence of data transmissions on a certain number of successive cycles.
POP3
See Post Office Protocol (POP3).