The art of Spectral Management ; Frequency allocations for VDSL2 - Whitepaper DSL03
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Spectral Management (SpM) involves managing an access network such that different systems can co-exist with each other. In relation to DSL systems, spectral management ensures that they can co-exist within the same cable. The use of spectral signal limits (specified via mandatory access rules) is necessary for all DSL deployments, and serves a common interest of all involved DSL operators. VDSL2 is a new technology, using higher frequencies above the frequency bands of legacy systems such as ADSL. This has made it necessary to separate up- and downstream signals in frequency. The result is a more efficient use of available bandwidth, which is essential for VDSL2 to transport higher bitrates. However a common frequency allocation plan for all regions in the world makes no sense due to the differences in topology, which has resulted in many options in the VDSL2 standard. This paper summarizes these different options, explains the rationale behind them, and provides some guidance for selecting a proper frequency allocation plan for a specific topology of interest. Such a selection is related to both business needs and network characteristics, which are different for different countries or regions.
TNO Identifier
348032
Publisher
TNO
Place of publication
Delft
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