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Glossary
call admission control
A device for managing traffic in ATM networks,
determining the possibility of a path containing adequate bandwidth for a
requested VCC.
call priority
In circuit-switched systems, the defining priority given to each
originating port; it specifies in which order calls will be reconnected. Addi-
tionally, call priority identifies which calls are allowed during a bandwidth
reservation.
call set-up time
The length of time necessary to effect a switched call
between DTE devices.
candidate packets
Packets identified by the MLS-SE as having the poten-
tial for establishing a flow cache. This determination is made based on the
destination MAC (DMAC) address. The DMAC address must be a MAC
address associated with a known MLS-RP. See also: MLS-SE, MLS-SE, and
MLS-RP.
CBR
Constant Bit Rate: An ATM Forum QoS class created for use in ATM
networks. CBR is used for connections that rely on precision clocking to
guarantee trustworthy delivery. Compare with: ABR and VBR.
CD
Carrier Detect: A signal indicating that an interface is active or that a
connection generated by a modem has been established.
CDP
Cisco Discovery Protocol: Cisco's proprietary protocol that is used to
tell a neighboring Cisco device about the type of hardware, software version,
and active interfaces that the Cisco device is using. It uses a SNAP frame
between devices and is not routable.
CDVT
Cell Delay Variation Tolerance: A QoS parameter for traffic man-
agement in ATM networks specified when a connection is established. The
allowable fluctuation levels for data samples taken by the PCR in CBR trans-
missions are determined by the CDVT. See also: CBR and PCR.
cell
In ATM networking, the basic unit of data for switching and multi-
plexing. Cells have a defined length of 53 bytes, including a 5-byte header
that identifies the cell's data stream and 48 bytes of payload. See also: cell
relay.
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