Panasonic 1200N User Manual
P
Glossary
B-58
Centillion 1200N ATM Switch User Manual
NTP 297-8103-903
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.
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.
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.
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.
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.
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.
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.
PNNI routing.