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Revision: 2010-01-20
12-1
12 Terminology
Throughout this document the following terminology is used:
Term
Meaning
CoS
Class of Service
DSCP
Differentiated Services Code Point. Code contained in the IP
header used to determine the priority of IP packets.
DSL Linerate
Data rate of a DSL span available to the application
DSL Master
Synonymous for STU-C
DSL Payload rate
Synonymous to DSL Linerate
DSL Slave
Synonymous for STU-R
DSL Span
Connection between STU-C and STU-R, composed of one or
more wire pairs.
DSL Sync rate
Physical synchronization rate of a DSL wire pair
EOC
Embedded Operations Channel, an overhead channel available in
SHDSL for management purposes
Linerate
cf. DSL Linerate
LTU
Line Termination Unit, functionally equivalent to STU-C
NTU
Network Termination Unit, functionally equivalent to STU-R
Payload rate
Synonymous to linerate
STU-C
Synchronous Terminal Unit Central Office Side. The end of a
DSL span that starts up and controls the link. Typically installed at
the central office
STU-R
Synchronous Terminal Unit Remote Side. The end of a DSL
span that is controlled by the STU-C. Typically installed at the cus-
tomer premises
Sync rate
Cf. DSL Sync rate
VID
Virtual LAN Identifier, a.k.a "VLAN Number". The unique identifier
of a VLAN. Carried in the VLAN Tag of an Ethernet frame.
VLAN
Virtual LAN (IEEE 802.1q)
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