3Com CoreBuilder 7000, Installation & Start?Up Manual, Page: 137 / 150

G
LOSSARY
137
out-of-band Transmission of auxiliary information e.g., management messages, over
a medium other than that used by the system users.
P
peer group A set of logical nodes which are grouped for purposes of creating a
routing hierarchy. PTSEs are exchanged among all members of the
group.
peer group leader A node which has been elected to perform some of the functions
associated with a logical group node.
physical link Any connection between two nodes in the lowest level hierarchy.
PNNI Routing Control
Channel
VCCs used for the exchange of PNNI routing protocol messages.
PNNI Private Network to Network Interface. A routing information protocol
that enables extremely scalable, full function, dynamic multi-vendor
ATM switches to be integrated in the same network.
peer group A set of logical nodes which are grouped for purposes of creating a
routing hierarchy. PTSEs are exchanged among all members of the
group.
point-to-multipoint
call
A one-way call or connection that has only one source, but may have
many destinations.
point-to-point call A two-way call or connection that has one source and one destination.
Protocol Data Unit
(PDU)
A unit of data specified in a layer protocol and consisting of protocol
control information and layer user data.
PTSE PNNI Topology State Element. A collection of PNNI information that is
flooded among all logical nodes within a peer group.
PVC
Permanent Virtual Connection. A basic connection method that
requires the user to define each connection manually.
Q
QoS (Quality of Service) Quality of service is defined on an end-to-end basis
in terms of the following attributes of the end-end-to-end ATM
connection: Cell Loss Ration, Cell Transfer Delay and Cell Delay
Variation.