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- Glossary(19)
- Terms used as applied to Data
(and some Voice) Transmission over Copper Wire
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Q
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- QAM
- QoS
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QAM (Quadrature Amplitude Modulation) --
A two dimensional modulation used in cable,
analogue (voice grade) and xDSL modems.
QoS
- Quality Of Service - A group of service classes defined by the ATM
forum in terms of different QoS parameters:
- Class 0 refers to the best effort service (UBR).
- Class 1 specifies the parameters for
circuit emulation, and the transport of CBR uncompressed video and
for VPNs.
AAL1
supports this kind of delay sensitive connection oriented service.
- Class 2 specifies the parameters for the
transport of VBR (low speed or compressed packetized) audio and
video.
AAL2
supports this delay sensitive, connection oriented class.
- Class 3 specifies the parameters for
connection oriented data transfer.
AAL3/4
and mostly AAL5
supports this delay tolerant class which is intended to provide
interoperability with SMDS and IP.
Class 4 specifies the parameters for
connectionless data transfer. AAL3/4 or AAL5 can be used to support
this delay tolerant class which is also intended to provide
interoperability with SMDS and IP.
Class X refers to the connection oriented
transport service where the traffic type (CBR or VBR) and timing
requirements (delay sensitive or non-sensitive) are defined by the
user. It is known as an unrestricted service class and which is
supported by
AAL5.
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