Planet GS-5220 Series User Manual page 559

Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is used mainly with ADSL services where
individual users connect to the ADSL transceiver (modem) over Ethernet and in plain Metro Ethernet
networks (Wikipedia).
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
User's Manual of GS-5220 LCD Series
559