Panasonic 1200N manual Pll, Plo, Pmd, Pni, Pnni

P Glossary

PLL

Phase Lock Loop: Phase Lock Loop is a mechanism whereby timing information is transferred within a data stream and the receiver derives the signal element timing by locking its local clock source to the received timing information.

PLO

Phase Locked Oscillator

PM

Physical Medium: Physical Medium refers to the actual physical interfaces. Several interfaces are defined including STS-1, STS-3c, STS-12c, STM-1, STM-4, DS1, E1, DS2, E3, DS3, E4, FDDI-based, Fiber Channel-based, and STP. These range in speeds from 1.544Mbps through 622.08 Mbps.

PMD

Physical Media Dependent: This sublayer defines the parameters at the lowest level, such as speed of the bits on the media.

PNI

Permit Next Increase: An ABR service parameter, PNI is a flag controlling the increase of ACR upon reception of the next backward RM-cell. PNI=0 inhibits increase. The range is 0 or 1.

PNNI

Private Network-Network Interface: A routing information protocol that enables extremely scalable, full function, dynamic multi-vendor ATM switches to be integrated in the same network.

PNNI Protocol Entity

The body of software in a switching system that executes the PNNI protocol and provides the routing service.

PNNI Routing Control Channel

VCCs used for the exchange of PNNI routing protocol messages.

PNNI Routing Domain

A group of topologically contiguous systems which are running one instance of

PNNI routing.

B-58	Centillion 1200N ATM Switch User Manual
	NTP 297-8103-903