Cisco 10008 Hardware Installation Manual page 160

Glossary
P
Logical grouping of information that includes a header containing control information and (usually)
Packet
user data. Packets are most often used to refer to network layer units of data. The terms datagram,
frame, message, and segment are also used to describe logical information groupings at various layers
of the OSI reference model and in various technology circles.
See POS.
Packet Over SONET
Networking method in which nodes share bandwidth with each other by sending packets.
Packet switching
See
Parallel Express
Forwarding
A portable (credit-card size), nonvolatile storage device. PCMCIA Flash disk cards use Flash
PCMCIA Flash disk
card technology to store data. PCMCIA stands for Personal Computer Memory Card International
Association, which sets the standard for this technology. Also called PC card.
Power entry module. A hardware module that distributes power to the chassis.
PEM
See PRE.
Performance
Routing Engine
See POP.
Point of Presence
See PPP.
Point-to-Point
Protocol
Point of presence. A physical location where an interexchange carrier installed equipment to
POP
interconnect with a local exchange carrier.
Packet Over SONET. A high-speed means of transmitting data over a SONET fiber-optic transmission
POS
system through a direct fiber connection to a data switch or router. POS is a point-to-point dedicated
leased-line approach intended purely for high-speed data applications. POS allows a user organization
to pass data in its native format, without the addition of any significant level of overhead in the form
of signaling and control information.
Power-on self test. A set of hardware diagnostics that runs on a hardware device when that device is
POST
powered on.
See PEM.
Power Entry Module
See POST.
Power-on self test
Point-to-Point Protocol. Provides router-to-router and host-to-network connections over synchronous
PPP
and asynchronous circuits.
Performance routing engine. The central routing unit for the Cisco 10008 router. The PRE performs all
PRE
Layer 2 and Layer 3 packet manipulation related to routing and forwarding through the Cisco 10008
router. Dual PREs can be configured in a single chassis for redundancy. See also
Processors.
Parallel eXpress Forwarding network processors. A pair of programmable ASICs that perform parallel
PXF Network
Processors processing to support high performance Layer 3 forwarding.
Cisco 10008 Router Hardware Installation Guide
GL-10
PXF Network Processors.
PXF Network
OL-0659-13