Cobalt Digital Inc RaQ 4 User Manual page 229

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 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.
PHP embedded scripting
PHP is an HTML-embedded scripting language that includes one or more
small embedded programs, or scripts, that are processed on a Web server
before the Web page is sent to the user.
Much of the PHP syntax is borrowed from C, Java and Perl with a few
unique PHP-specific features thrown in. The goal of the language is to allow
Web developers to write dynamically generated pages quickly.
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.
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