User manual

Appendix G: Glossary
266 Cobalt Qube 3 User Manual
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.
Point-to-Point Protocol (PPP)
A protocol for communication between two computers using a serial
interface, typically a personal computer connected by telephone line to a
server. For example, your Internet server provider may provide you with a
PPP connection so that the provider’s server can respond to your requests,
pass them on to the Internet and forward your requested Internet responses
back to you. PPP uses the Internet protocol (and is designed to handle
others).
PPP is a full-duplex protocol that can be used on various physical media,
including twisted pair, fiber optic lines or satellite transmission. It uses a
variation of High Speed Data Link Control for packet encapsulation. PPP
can handle synchronous as well as asynchronous communication.
Point-to-Point Protocol over Ethernet (PPPoE)
A specification for connecting multiple computer users on an ethernet to a
remote site through common customer-premises equipment such as a
modem and similar devices. PPPoE can be used to allow an office or
building full of users share a common digital subscriber line (DSL), cable
modem or wireless connection to the Internet. PPPoE combines the
Point-to-Point Protocol (PPP), commonly used in dial-up connections, with
the ethernet protocol, which supports multiple users in a local area network
(LAN). PPP information is encapsulated within an Ethernet frame.
POP3
See Post Office Protocol (POP3).