284
PTP
Q
QCE
QCI
QL
QoS
R
RARP
RADIUS
RDI
RSTP
PTP is an acronym for Precision Time Protocol, a network protocol for synchronizing
the clocks of computer systems.
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 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 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 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.
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 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.
RDI is an acronym for Remote Defect Indication. It is an OAM functionality that is
used by a MEP to indicate defect detected to the remote peer MEP
In 1998, the IEEE with document 802.1w introduced an evolution of STP: the Rapid
Spanning Tree Protocol, which provides for faster spanning tree convergence after a
topology change. Standard IEEE 802.1D-2004 now incorporates RSTP and obsoletes
STP while being backwards-compatible with STP.