132GLOSSARY
connection- A form of
communications
crankback A mechanism used by ATM networks when a connection setup request is blocked. The path is rolled back to an intermediate node, which attempts to discover another path to the final destination.
CTD Cell Transfer Delay. This is defined as the elapsed time between a cell exit event at measurement point 1 (e.g., at the source UNI) and the corresponding cell entry event at measurement point 2 (e.g.,the destination UNI) for a particular connection. The cell transfer delay between two points is the sum of the total
D
database PTSE information is flooded on a continuous basis, until each node in synchronization the peer group has the same information in its database.
DCE Data Communications Equipment. The equipment providing functions that establish, maintain and terminate a data transmission connection.
DTE Data Terminal Equipment. The equipment connected to the common carrier communications facility. The DTE is typically a computer system or terminal.
DTL Designated Transit List. A list of node and optionally link IDs that completely specify a path across a single PNNI peer group.
E
E.164 A public network addressing standard utilizing up to a maximum of 15 digits. ATM uses E.164 addressing for public network addressing.
end system / end A system where an ATM connection is terminated or initiated. An station originating end system initiates the ATM connection, and a terminating
end system terminates the ATM connection. OAM cells may be generated and received.
EFCI Explicit Forward Congestion Indication. EFCI is a congestion notification
mechanism that the ATM layer service user may make use of to improve the utility that can be derived from the ATM layer. The ABR
