3Com CoreBuilder 7000 Operation Manual page 245

C
call
cell
cell delay variation
cell loss ratio
CoreBuilder 7000
CLP
CLR
collision
connection
connectionless
communications
An association between two or more users or between a user and a
network entity that is established by the use of network capabilities.
This association may have zero or more connections.
An ATM Layer protocol data unit (PDU) characterized by fixed, rather
than variable, length payloads.
A quantification of cell clumping for a connection. The cell clumping
CDV (y ), is defined as the difference between a cell's expected
k
reference arrival time (c
reference arrival time (c
max[ck-1+T,ak]. T is the reciprocal of the negotiated peak cell rate.
In a network/network element, cell loss ratio is (1-x/y), where y is the
number of cells that arrive in an interval at the ingress of the
network/network element; and x is the number of these y cells that
leave at the egress of the network/network element.
The 3Com CoreBuilder 7000/7000HD switch is a high-performance,
modular ATM switch.
Cell Loss Priority. A bit in the ATM cell header indicating that if there is
a need to discard a cell, the cell with the CLP bit marked is to be
discarded.
Cell Loss Ratio. CLR is a negotiated QoS parameter and acceptable
values are network specific. The objective is to minimize CLR provided
the end-system adapts the traffic to the changing ATM layer transfer
characteristics. The Cell Loss Ratio is defined for a connection as: Lost
Cells/Total Transmitted Cells.
Overlapping transmission of two or more nodes onto media. All data is
unusable.
An ATM connection consists of the concatenation of ATM Layer links in
order to provide an end-to-end information transfer capability to access
points.
A form of packet-switching that relies on global addresses in each
packet rather than on predefined virtual circuits.
) and its actual arrival time (a
k
) of cell k of a specific connection is
k
G 245
LOSSARY
). The expected
k