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ETSI TR 101 830-1
M00005169
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ETSI TR 101 830-1 Transmission and Multiplexing (TM); Access networks; Spectral management on metallic access networks; Part 1: Definitions and signal library
standard by European Telecommunications Standards Institute, 05/01/2009
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Full Description
The present document gives guidance on a common language for Spectral Management specifications. It provides a setof definitions on Spectral Management quantities, including:a) a description of the technical purpose of Spectral Management;The present document is applicable to simplify and harmonize the description of network specific Spectral Managementdocuments. The objective is to be a clear reference for these documents, without making any specific choice on thetechnology mix that may use the access network. Network specific documents, that rule the cable fill and technologymix for Spectral Management purposes, can be kept compact by referring to the definitions in the present document.
b) a common reference model to identify LT-ports, NT-ports, upstream, downstream, etc.;
c) a minimum set of characteristics necessary to describe signals within the context of Spectral Management; and
d) an informative library of electrical signals that may flow into the ports of a metallic access network.
The informative library of signal definitions is organized in clusters of signal categories. Each category defines,independent from other categories, a full set of signal limits between DC and 30 MHz. These categories are dominantlybased on transmission equipment standards from ETSI and ITU (existing or in progress), and on the technicalunderstanding of additional requirements to protect future technology. When these definitions are incomplete or notappropriate, network specific spectral management documents may use additional definitions.
The characteristics of each signal described in this signal library identify their absolute maximum (or minimum) values.They fully account for the spread in their actual value, unless this tolerance is explicitly specified. This means inpractice that when a power limit of a signal category is specified by a single number (for instance 14 dBm), it refers toits nominal maximum power plus its tolerance (for instance +13,5 dBm 0,5 dBm). This approach provides clearcriteria to determine if a signal under test is compliant or not with a signal category from this library.
The intention of the present document is to present a set of signal descriptions from various sources collected into asingle document. Some of the descriptions have their origin in xDSL related ETSI and ITU publications and some arecompletely new. Detailed references have been included where applicable.
Due to differences in the way these signals are described in the different sources, the description has been harmonizedinto a uniform format. This enables a unified signal specification method for spectral management purposes. It shouldbe noted that, although this unification has been carried out with the best intentions, and with the best knowledgeavailable, some content of the original source document may not have been correctly interpreted or copied into thepresent document.
In the case of discrepancies between a signal description in the present document and the original source document(s),the source(s) should be regarded as definitive. Therefore the content of the present document should be regarded asinformative.