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Glossary-5
Glossary
Parity
A technique for verifying whether or not data has been lost or overwritten when it is
transferred from one place in storage to another or between computers.
PCMCIA
Personal Computer Memory Card Interface Association.
PCMCIA Card
A plug-in expansion card for laptop computers and other devices, also called a PC Card. PC
Cards are 85.6 mm long x 54 mm wide, and have a 68 pin connector. There are several
different kinds:
RAM
Random Access Memory. Data in RAM can be accessed in random order, and quickly written
and read.
RF
Radio Frequency.
ROM
Read-Only Memory. Data stored in ROM cannot be changed or removed.
Router
A device that connects separate networks. Routers are typically used to extend the range of
cabling and to organize the topology of a network into subnets. They also support the
required protocols for packet filtering. Refer to Subnet.
RTC
Real Time Clock.
Type Height Common Use
Type I 3.3 mm RAM or Flash RAM
Type II 5 mm modems, LAN adaptors
Type III 10.5 mm Hard Disks