Revision: 2012-02-15
8-1
8 Terminology
Throughout this document the following terminology is used:
Term
Meaning
CoS
Class of Service
CPE
Customer Premises Equipment
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 Link
Synonymous for DSL Span
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 link 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 link
that is controlled by the STU-C. Typically installed at the customer
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)
C-VLAN
Customer VLAN
S-VLAN
Serviced Provider VLAN
