Glossary of Acronyms and Key Terms

1:1 VLAN structure—In general terms, 1:1 is an architecture that matches one resource to one user or requestor. In a broadband access context, it is a VLAN architecture that assigns one VLAN per DSL port, or household.

2B1Q—2 binary, 1 quaternary. A physical-layer line-coding scheme that was used in early HDSL lines. The signal has four voltage levels, each of which represents 2 bits. One of its benefits over the early AMI scheme is its improved electromagnetic spectrum efficiency.

5-tuple—A compact way of expressing a combination of source IP address, destination IP address, transport protocol type (TCP or UDP), source transport port, and destination protocol port. A 5-tuple commonly identifies a traffic flow ...

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