Liason from the DSL Forum

DSL Forum Liaison to:
Mike Sneed, IETF ADSLMIB Chair

From:
Gavin Young, DSL Forum Technical Committee Chair
[email protected]

Date: November 13, 2003

Subject: DSL Forum Liaison to the IETF

Dear Mr. Sneed,

We wish to inform the IETF that the DSL Forum has a new working text, 
WT-096, entitled “SCM-Specific Managed Objects in VDSL Network Elements” 
which is attached.  This document is going for straw ballot at our next 
meeting in March 2-4, 2004.

After our last meeting we informed you that we had started work on the 
element management of next generation ADSL.  The intent of the work being to 
create a protocol-independent object model suited to the management of the 
enhanced features of ADSL2, ADSL2plus and ADSL2lite.  Good progress has been 
made and we wish to inform you that we anticipate the working text going to 
straw ballot at our meeting in May 18-20, 2004.  When the working text is 
stable it will be liaised to you.

Sincerely,




Gavin Young
DSL Forum Technical Chair

DSL Forum

Working Text
WT-096
Revision-1

Straw Ballot

SCM Specific Managed Objects In VDSL Network Element



For
Operations and Network Management Working Group

Date:  November, 2003


Abstract:
This working text contains SCM specific managed objects that can optionally 
be used for VDSL network elements, in addition to the line-code-independent 
parameters specified by the VDSL Network Element Management (TR-057).


Notice:
This Working Text represents work in progress by the DSL Forum and must not 
be construed as an official DSL Forum Technical Report.  Nothing in this 
document is binding on the DSL Forum or any of its members.  The document is 
offered as a basis for discussion and communication, both within and without 
the DSL Forum.
Contents
1Introduction	3
2SCM Specific VDSL Configuration Parameters	3
2.1Configuration Carrier Identity	3
2.2Configuration Carrier Usage	3
2.3Configuration Center Frequency Factor	4
2.4Configuration Symbol Rate Factor	4
2.5Configuration Constellation Size	4
2.6Configuration PSD Level	4
3SCM Specific VDSL Actual Parameters 	4
3.1Actual Carrier Identity	4
3.2Carrier Usage	4
3.3Center Frequency Factor	4
3.4Symbol Rate Factor	5
3.5Constellation Size	5
3.6Carrier PSD Level	5
4SCM Specific VDSL Band Measurements	5
4.1Carrier Identity	5
4.2SNR Margin	5
4.3Attenuation	5
5References	5

1Introduction

The Operations and Network Management Working Group of DSL Forum developed 
the “VDSL Network Element Management” (WT-68, now TR-057). TR-57 defines the 
line-code-independent parameters required for managing VDSL lines.

This document defines SCM line-code-specific managed objects that can be 
optionally used in certain cases such as for diagnostics and per band 
management, if preferred.

2SCM Specific VDSL Configuration Parameters

The following line-code-specific parameters may be used for configuring an 
SCM VDSL line. The parameters are defined per each provisioned SCM carrier 
in a line configuration.
It is assumed that line-code-specific configuration will be used only in 
special cases such as for testing and may not be consistent with parameters 
configured through the Configuration Parameters of VDSL Network Element 
Management as described in TR-057[1].
If used, this set of parameters should supercede VDSL Configuration 
Parameter configurations previously requested for Deployment Scenario and 
Spectrum Management and may not be consistent with configurations for Data 
Rate Management.
2.1Configuration Carrier Identity
An enumerated index that identifies the carrier associated with the set of 
configuration parameters.
The Configuration Carrier Identity may have one of the following values:
Optional Band (range from 25 kHz to 138 kHz. See TR-057, section 2.3.3)
1D  (transmission from VTU-C in first downstream band)
1U  (transmission from VTU-R in first upstream band)
2D  (transmission from VTU-C in second downstream band)
2U  (transmission from VTU-R in second upstream band)

Note that use and direction of the Optional Band is determined by Spectral 
Management Configuration Parameters of VDSL Network Element Management as 
described in TR-057.
2.2Configuration Carrier Usage
This parameter specifies if the carrier, referred by Configuration Carrier 
Identity, is used. The values may be:
Used
Not Used

When referencing the Optional Band this parameter should reflect the 
Optional Band Usage as determined by Spectral Management Configuration 
Parameters that is described in TR-057.
2.3Configuration Center Frequency Factor
The integer ratio of the center frequency to 16.875 kHz, for the carrier 
referred by Configuration Carrier Identity.
2.4Configuration Symbol Rate Factor
The integer ratio of the symbol rate to 33.75 kbaud, for the carrier 
referred by Configuration Carrier Identity.
2.5Configuration Constellation Size
The number of bits per symbol modulated onto the carrier, referred by 
Configuration Carrier Identity.
2.6Configuration PSD Level
The PSD level of the carrier, referred by Configuration Carrier Identity, in 
the range: -38 dBm/Hz to -140 dBm/Hz using steps of 0.25 dBm/Hz.

3SCM Specific VDSL Actual Parameters

The following parameters indicate the actual working parameters of an SCM 
VDSL line. The parameters are defined per each provisioned SCM carrier in a 
line configuration.

These parameters may be the result of configuration through VDSL Network 
Element Management - Data Rate Management with either Manual or Rate 
Adaptation mode or the result of line-code-specific configurations as 
described above.
3.1Actual Carrier Identity
A set of Current Configuration Parameters is recorded for the carrier 
identified by Actual Carrier Identity.
This is an enumerated index that may have one of the following values:
Optional Band (range from 25 kHz to 138 kHz. See TR-057, section 2.3.3)
1D  (transmission from VTU-C in first downstream band)
1U  (transmission from VTU-R in first upstream band)
2D  (transmission from VTU-C in second downstream band)
2U  (transmission from VTU-R in second upstream band)
3.2Carrier Usage
This parameter specifies if the carrier, referred by Actual Carrier 
Identity, is currently in use. The values may be:
Used
Not Used
3.3Center Frequency Factor
The integer ratio of the actual center frequency to 16.875 kHz, for the 
carrier indicated by the Actual Carrier Identity.
3.4Symbol Rate Factor
The integer ratio of the actual symbol rate to 33.75 kbaud, for the carrier 
indicated by the Actual Carrier Identity.
3.5Constellation Size
The number of bits per symbol modulated onto the carrier indicated by the 
Actual Carrier Identity.
3.6Carrier PSD Level
PSD level in the range: -38 dBm/Hz to -140 dBm/Hz in 0.25 dBm/Hz steps, of 
the carrier indicated by the Actual Carrier Identity.
4SCM Specific VDSL Band Measurements

The following parameters indicate measurements per each provisioned carrier 
in an SCM VDSL line configuration.
4.1Carrier Identity
A set of physical measurements parameters associated with the carrier 
identified by Carrier Identity.
This is an enumerated index that may have one of the following values:
Optional Band (range from 25 kHz to 138 kHz. See TR-057, section 2.3.3)
1D  (transmission from VTU-C in first downstream band)
1U  (transmission from VTU-R in first upstream band)
2D  (transmission from VTU-C in second downstream band)
2U  (transmission from VTU-R in second upstream band)
4.2SNR Margin
The SNR margin measured on the carrier indicated by the Carrier Identity 
having values in the range: -31.75 dB to +31.75 dB in steps of 0.25 dB.
4.3Attenuation
The line attenuation measured on the carrier indicated by the Carrier 
Identity having values in the range: 0 dB to 63.75 dB in steps of 0.25 dB.

5References
[1]	DSL Forum TR-057: “VDSL Network Element Management”, February 2002.