Appendix A
Acronyms
138
PPPoE
PPPoE is an acronym for Point-to-Point Protocol over Ethernet. It is a network protocol for encapsulating 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, PVLANs provide layer 2 isolation between ports within the same broadcast domain. Isolated ports
configured as part of PVLAN cannot communicate with each other. Member ports of a PVLAN can communicate with
each other.
PTP
PTP is an acronym for Precision Time Protocol, a network protocol for synchronizing the clocks of computer systems.
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.
QCI
QCI is an acronym for QoS Class Identifier. This is a special identifier defining the quality of packet communication
provided by LTE (Long Term Evolution, marketed as 4G LTE).
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.
QoS class
Every incoming frame is classified to a QoS class, which is used throughout the device for providing queuing,
scheduling and congestion control guarantees to the frame according to what was configured for that specific QoS
class. There is a one to one mapping between QoS class, queue and priority. A QoS class of 0 (zero) has the lowest
priority.
Querier Election
Querier election is used to dedicate the Querier, the only one router sends Query messages, on a particular link.
Querier election rule defines that IGMP Querier or MLD Querier with the lowest IPv4/IPv6 address wins the election.
RARP
RARP is an acronym for Reverse Address Resolution Protocol. It is a protocol that is used to obtain an IP address for
a given hardware address, such as an Ethernet address. RARP is the complement of ARP.
RADIUS
RADIUS is an acronym for Remote Authentication Dial In User Service. It is a networking protocol that provides
centralized access, authorization and accounting management for people or computers to connect and use a network
service.
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