Vigitron MaxiiNet Vi30126 Series, Operation Manual

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Policer
A policer can limit the bandwidth of received frames. It is located in front of the
ingress queue.
Private VLAN
In a private VLAN, communication between ports in that private VLAN is not
permitted. A VLAN can be configured as a private VLAN.
PTP
PTP is an acronym for Precision Time Protocol, a network protocol for
synchronizing the clocks of computer systems.
Q
QCE
QCE is an acronym for QoS Control Entry. It describes QoS class associated
with a particular QCE ID. There are six QCE frame types: Ethernet Type, VLAN,
UDP/TCP Port, DSCP, TOS, and Tag Priority. Frames can be classified by one of
4 different QoS classes: "Low", "Normal", "Medium", and "High" for individual
application.
QCL
QCL is an acronym for QoS Control List. It is the list table of QCEs, containing
QoS control entries that classify to a specific QoS class on specific traffic objects.
Each accessible traffic object contains an identifier to its QCL. The privileges
determine specific traffic object to specific QoS class.
QL
QL in SyncE; this is the Quality Level of a given clock source. This is received on
a port in a SSM indicating the quality of the clock received in the port.
QoS
QoS is an acronym for Quality of Service. It is a method to guarantee a
bandwidth relationship between individual applications or protocols.
A communications network transports a multitude of applications and data,
including high-quality video and delay-sensitive data such as real-time voice.
Networks must provide secure, predictable, measurable, and sometimes
guaranteed services.
Achieving the required QoS becomes the secret to a successful end-to-end
business solution. Therefore, QoS is the set of techniques to manage network
resources.