Cisco Systems 78-11450-03 specifications See Fiber-optic cable, See PXF Network Processors, GL-10

Glossary

Optical carrier	See OC.
Optical fiber	See Fiber-optic cable.

P

Packet	Logical grouping of information that includes a header containing control information and (usually)
	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.
Packet Over SONET	See POS.
Packet switching	Networking method in which nodes share bandwidth with each other by sending packets.
Parallel Express	See PXF Network Processors.
Forwarding
PCMCIA Flash disk	A portable (credit-card size), nonvolatile storage device. PCMCIA flash disk cards use Flash
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.
PEM	Power entry module. A hardware module that distributes power to the chassis.
Performance	See PRE.
Routing Engine
Point of Presence	See POP.
Point-to-Point	See PPP.
Protocol
POP	Point of presence. A physical location where an interexchange carrier installed equipment to
	interconnect with a local exchange carrier.
POS	Packet Over SONET. A high-speed means of transmitting data over a SONET fiber-optic transmission
	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.
POST	Power-on self test. A set of hardware diagnostics that runs on a hardware device when that device is
	powered on.
Power Entry Module	See PEM.
Power-on self test	See POST.
PPP	Point-to-Point Protocol. Provides router-to-router and host-to-network connections over synchronous
	and asynchronous circuits.

	Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
GL-10	78-11450-03 Rev.B0