Purpose
Many operators tend to have locations where copper binders have pairs coming from a CO and pairs coming from a remote cabinet. When the remote cabinet locations get broadband enabled this often creates spectral compatibility issues in the network: the strong ADSL signal coming from the remote cabinet creates strong cross talk to the weak signal coming from the CO. This results in a very unstable line for the one connected to the CO.
To resolve this, a custom Power Spectral Density (PSD) shape is configurable via the xDSL spectrum profile. A custom defined PSD allows:
•
for a better spectrum usage (and better performance as a consequence)•
for protection of the xDSL coming from the COCustomized PSD values can be configured for:
•
ADSL2+•
VDSL•
VDSL2Up to 20 breakpoints can be configured. When configuring a custom PSD shape, a minimum of 2 PSD points must be configured.
Customized PSD points can be configured while creating a new spectrum profile (see DLP 1129) or by modifying an existing spectrum profile (see DLP 1163).
DLP 1188 — Configure custom PSD points
DLP 1188-2 December 2011 Alcatel-Lucent 7302 | 7330 | 7356 R4.3.02
Operations and Maintenance Using CLI for FD 24 NT Edition 02 Released 3HH-10104-AAAA-TQZZA The commands below help the operator to enter the custom PSD shape in a
user-friendly way. Instead of entering octets, the operator can enter numbers corresponding to frequency and PSD.
See the CLI Command Guide for FD 24Gbps NT document and also TNG 1107 for a full description of all related parameters.
Procedure
Proceed as follows to configure custom PSD points: 1 For the configuration of:
•
custom PSD points for ADSL2+, go to step 2•
custom downstream PSD points for VDSL, go to step 3•
custom upstream PSD points for VDSL, go to step 4•
custom downstream PSD points for VDSL2, go to step 5•
custom upstream Rx PSD points for VDSL2, go to step 6•
custom upstream PSD points for VDSL2, go to step 72 Configure the custom PSD points for ADSL2+ as follows:
i Configure a xDSL spectrum profile with the following command: configure xdsl spectrum-profile (index)
name <AsamProfileName> version <SignedInteger>
ii Configure the PSD for ADSL2+ as custom PSD with the following command: configure xdsl spectrum-profile (index) adsl2-plus
psd-shape-down custom-psd-down
Warning — When a Custom PSD mask is created, it is up to the operator to make sure that the provided breakpoints are in accordance with the PSD slope rules defined in the applicable standard (for example, G992.5, clause 8.5.1).
A PSD mask configuration violating these rules will not be rejected, but the DSL chipset will perform a best-effort fit using the PSD shaping rules of the applicable standard. It is thus possible that the configured PSD mask may be violated.
If the PSD breakpoints are configured in accordance with the PSD slope rules defined in the applicable standard then the actual PSD shall always remain below the configured breakpoints. This means that, for example, for ADSL2plus it is not possible to have infinite slopes in the PSD mask.
DLP 1188 — Configure custom PSD points
iii Configure the PSD values with the following command:
configure xdsl spectrum-profile (index) adsl2-plus cust-psd-pt-down (psdpt)
frequency <Xdsl::CustFrqAdsl2> psd <Xdsl::CustomAdsl2Psd>
iv Go to step 8
3 Configure the custom downstream PSD points for VDSL as follows: i Configure a xDSL spectrum profile with the following command:
configure xdsl spectrum-profile (index) name <AsamProfileName>
version <SignedInteger>
ii Configure the downstream PSD for VDSL as custom PSD with the following command:
configure xdsl spectrum-profile (index) vdsl psd-shape-down custom-psd-down
iii Configure the downstream PSD scale and type with the following command: configure xdsl spectrum-profile (index) vdsl
cust-psd-sc-down linear | logarithmic cust-psd-ty-down mask | template
iv Configure the downstream PSD values with the following command: configure xdsl spectrum-profile (index) vdsl
cust-psd-pt-down (psdpt) frequency <Xdsl::CustFreq> psd <Xdsl::CustPsd>
v Go to step 8
4 Configure the custom upstream PSD points for VDSL as follows: i Configure a xDSL spectrum profile with the following command:
configure xdsl spectrum-profile (index) name <AsamProfileName>
version <SignedInteger>
ii Configure the upstream PSD for VDSL as custom PSD with the following command:
configure xdsl spectrum-profile (index) vdsl rx-psd-shape-up custom-rx-psd-up
iii Configure the upstream PSD scale and type with the following command: configure xdsl spectrum-profile (index) vdsl
DLP 1188 — Configure custom PSD points
DLP 1188-4 December 2011 Alcatel-Lucent 7302 | 7330 | 7356 R4.3.02
Operations and Maintenance Using CLI for FD 24 NT Edition 02 Released 3HH-10104-AAAA-TQZZA
iv Configure the upstream PSD values with the following command: configure xdsl spectrum-profile (index) vdsl
cust-rx-psd-pt-up (psdpt) frequency <Xdsl::CustFreq> psd <Xdsl::CustPsd>
v Go to step 8
5 Configure the custom downstream PSD points for VDSL2 as follows: i Configure a xDSL spectrum profile with the following command:
configure xdsl spectrum-profile (index) name <AsamProfileName>
version <SignedInteger>
ii Configure the downstream PSD for VDSL2 as custom PSD with the following command:
configure xdsl spectrum-profile (index) vdsl2 psd-shape-down custom-psd-down
iii Configure the downstream PSD scale and type with the following command: configure xdsl spectrum-profile (index) vdsl2
cust-psd-sc-down linear | logarithmic cust-psd-ty-down mask | template
iv Configure the downstream PSD values with the following command: configure xdsl spectrum-profile (index) vdsl2
cust-psd-pt-down (psdpt) frequency <Xdsl::CustFreq> psd <Xdsl::CustPsd>
v Go to step 8
6 Configure the upstream Rx PSD points for VDSL2 as follows:
i Configure a xDSL spectrum profile with the following command: configure xdsl spectrum-profile (index)
name <AsamProfileName> version <SignedInteger>
ii Configure the upstream Rx PSD for VDSL2 as custom PSD with the following command:
configure xdsl spectrum-profile (index) vdsl2 rx-psd-shape-up custom-rx-psd-up
iii Configure the upstream Rx PSD scale and type with the following command: configure xdsl spectrum-profile (index) vdsl2
cust-rx-psd-sc-up linear | logarithmic cust-rx-psd-ty-up mask | template