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G-8
Cajun P550/P880 ATM Uplink User Guide, Version 1.1
Packet Replication Replicates multicasting by sending a single packet to a default VC
that copies the packet to multiple PVCs.
Password
Authentication
Protocol (PAP)
The Password Authentication Protocol (PAP) provides a simple
method for the peer to establish its identity using a 2-way
handshake. This is done only upon initial link establishment.
Partition A physical subdivision of a virtual LAN; it is specified by the
assignment of LAN segments.
Payload Information portion of an ATM cell, exclusive of header. ATM cells
typically have 48-byte payloads, but size can vary, depending upon
data type.
Peak Cell Rate
(PCR)
The maximum rate at which cells can be transmitted across a virtual
circuit, specified in cells per second and defined by the interval
between the transmission of the last bit of one cell and the first bit of
the next.
Peer
The other end of the point-to-point link; the end which is being
authenticated by the authenticator.
Permanent Virtual
Circuit (PVC)
A virtual link with fixed end-points that are defined by the network
manager. A single virtual path may support multiple PVCs.
Physical Layer
Convergence
Protocol (PLCP)
A protocol specified within the TC sublayer that defines how cells
are formatted within a data stream for a particular transmission
facility, such as T1, T3, or OC-n.
Physical Layer
(PHY)
The bottom layer of the ATM protocol stack, which defines the
interface between ATM traffic and the physical media. The PHY
consists of two sublayers: the Physical Medium-Dependent (PMD)
sublayer and the Transmission Convergency (TC) sublayer.
Policy A set of rules that control an endstation’s access to other segments in
the backbone network.
Point to Point
Protocol (PPP)
A protocol used to exchange IP frames (and others) over a serial
link. The Point-to-Point Protocol is designed for simple links which
transport packets between two peers. These links provide full-
duplex simultaneous bi-directional operation, and are assumed to
deliver packets in order.
Private Network-
to-Network
Interface (PNNI)
A routing information protocol that allows different vendors’ ATM
switches to be integrated in the same network. PNNI automatically
and dynamically distributes routing information, enabling any
switch to determine a path to any other switch.