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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
pulse code modulation (PCM)
A standardized method of producing digital speech. Defined in ITU-T G.711.
PVC
1 See permanent virtual channel (PVC) (page 101).
2 See permanent virtual circuit (PVC) (page 101).
PVG
See packet voice gateway (PVG) (page 96).
PVID
See port-VLAN identifier (PVID) (page 104).
PVP
See permanent virtual path (PVP) (page 101).
Q interface signaling (QSIG)
An internationally defined inter-PBX signaling standard. Defined in European
Telecommunications Standards Institute (ETSI) specifications.
QC
See queue controller (QC) (page 110).
QOS, QoS, Qos
See quality of service (QOS, QoS, Qos) (page 109).
QSIG
See Q interface signaling (QSIG) (page 109).
Q-tag
An abbreviated name for the IEEE 802.1Q VLAN tag header that consists of
the TPID and TCI sub-headers. This header identifies the user priority and
LAN identification for an Ethernet packet.
QRD
See queue relay device (QRD) (page 110).
quality of service (QOS, QoS, Qos)
A series of service classes that reflect the traffic importance and urgency over
a connection.
For ATM networks and services, QOS classes are defined by the ATM Forum
for UNI 3.0/3.1 and UNI 4.0. Nortel Multiservice Switch system also defines a
set of corresponding ATM QOS classes (UBR, CBR, VBR, CO, CNLS).