Configuration / DPBO Profile Help

The DPBO profile allows configuration of the ITU-T G.997.1, paragraph 7.3.1.2.13 Downstream Power Back-Off DPBO Assumed exchange PSD mask breakpoints (referred to as DPBOEPSD in the ITU-T document). There are a maximum of 16 breakpoints. This set of breakpoints defines the PSD mask that is assumed to be permitted at the exchange. If an EPSD profile is not created or configured for a default DPBO data set, the default PSD shape is assumed.

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Note: DPBO configuration data should be calculated for each network using formula provided in ITU-T G.997.1 or those provided in a country specific specification. Typically the model is consistent across a given network with just the electrical length value ESEL changing for different nodes.

Profile

Profile Index

Index number for the profile.

Profile Name

Name of the DPBO profile.

E-Side Elec. Length

Specifies the assumed electrical length of cables (E-side cables) connecting exchange based DSL services to the remote flexibility point (cabinet) that hosts the xTU-C that is subject to spectrally shaped downstream power back-off depending on this length. The electrical length is defined as the loss (in dB) of an equivalent length of hypothetical cable at a reference frequency defined by the network operator or in spectrum management regulations.

Values: 0 (disabled) to 2555 (in 0.1 db)

E-SideCable Model-A

One of three values that defines a cable model describing the frequency dependent loss of E-side cables using the formula:

ESCM(f) = (E-SideCable Model-A+ E-SideCable Model-B* SQRT(f) + E-SideCable Model-C* f ) * E-Side Elec. Length

where ESCM is expressed in dB and f is expressed in MHz.

Values: 0 (disabled) to 640(in 1/256 db)

E-SideCable Model-B

One of three values that defines a cable model describing the frequency dependent loss of E-side cables using the formula:

ESCM(f) = (E-SideCable Model-A+ E-SideCable Model-B* SQRT(f) + E-SideCable Model-C* f ) * E-Side Elec. Length

where ESCM is expressed in dB and f is expressed in MHz.

Values: 0 (disabled) to 640(in 1/256 db)

E-SideCable Model-C

One of three values that defines a cable model describing the frequency dependent loss of E-side cables using the formula:

ESCM(f) = (E-SideCable Model-A+ E-SideCable Model-B* SQRT(f) + E-SideCable Model-C* f ) * E-Side Elec. Length

where ESCM is expressed in dB and f is expressed in MHz.

Values: 0 (disabled) to 640(in 1/256 db)

Maximum Frequency

Maximum frequency. Defines the maximum frequency at which DPBO may be applied. It ranges from 138 kHz to 29997.75 kHz in steps of 4.3125 kHz.

Minimum Frequency

Minimum frequency. Defines the minimum frequency from which the DPBO shall be applied. It ranges from 0 kHz to 8832 kHz in steps of 4.3125 kHz.

Min. Usable Signal

Minimum Usable Signal. Defines the assumed Minimum Usable receive PSD mask (in dBm/Hz) for exchange based services, used to modify parameter Maximum Frequency. It represents a PSD mask level from 0 dBm/Hz to -127.5 dBm/Hz in steps of 0.1 dB. All values in the range are valid.

Note: The PSD mask level is 3.5 dB above the signal PSD level.

 

July 8, 2011