CableLabsSpecification Engineering Change (EC) Form
Project
EC TRACKING INFORMATION (Blue fields to be completed by CableLabs only)
DOCSIS
N Identifier MULPIv3.1-N-14.1213-2
Status
CM-SP-MULPIV3.1-I03-140610
10/22/2014
Comment Period End Date 10/29/2014
SEVERITY
10/29/2014
Comment Period End Date 11/12/2014
Non-Critical
11/12/2014
114
Critical
Cert Wave No
Overall Type of Change (Tech/Edit/Both) Technical
Affected Specification
ECR Date
ECO Date
ECN Date
ECN Effective Date
Version
2
CHANGE TYPE
Minor
Major
TO OBTAIN LATEST ISSUED SPECIFICATION WORD VERSION, CLICK HERE:
https://www.cablelabs.com/doczone/docsis/requirements/specs/current/issued/
TO SUBMIT EC, EMAIL COMPLETED FORM TO: docsis_ec@cablelabs.com
SPECIFICATION DOCUMENT DETAILS
Document EC is written against: CM-SP-MULPIv3.1 Issued Version # I03
AUTHOR INFORMATION
Primary Author
Email
Company
Additional Contributors
First Lisa Last Denney
lvdenney@broadcom.com
Broadcom Corporation
Margo Dolas, Broadcom
Title of EC
Date sent to CableLabs
Clarification of UCD and OCD Subcarrier Exclusion
10/15/2014
Date of revised EC
Brief description of revision
10/22/14
update from 10/15/14 MULPIv3.1 meeting
Country
Phone
USA
678-475-3102
ENGINEERING CHANGE DOCUMENT DETAILS
EC REVISION HISTORY
DETAILED PROPOSED CHANGES
Sections Affected
REQs Affected
6.4.3; 6.4.39
Yes
Test Plans Affected
Unknown
OTHER RELATED ENGINEERING CHANGES (LIST ALL THE APPLY)
The following EC(s) are recommended to be processed in conjunction with this document:
EC#
Title of EC
Affected Document
NOTE! IMPORTANT EC AUTHOR INSTRUCTIONS:
For an ECR to advance to ECO status:
- Requirements Affected section of the embedded DOCSIS-SpecDetailChange.docx must be completed.
- If applicable, the embedded TestPlanDetailChanges.docx must be completed.
For an ECO to advance to ECN status:
- If applicable, compiled MIB files and final Schema docs must be attached before requested changes can
move to ECN status and noted as attachments in the table directly below.
DOCSIS_3.1_Spec-TestPlan_EC-Form_6-2014.docx
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In submitting the Engineering Change Request ("ECR"), the Author(s) [primary author, additional authors, and contributors], individually and as
an authorized representative of the Company, agrees that if CableLabs incorporates this ECR in whole or in part into the relevant Specification,
all intellectual property in the ECR shall be licensed royalty free, and without confidentiality, under the terms of the "Data Over Cable Service
Interface Specifications License Agreement" ("Contribution Agreement"). CableLabs may disclose the content of this ECR to CableLabs'
members and such others as is necessary for the development of CableLabs' specifications. Questions about the Authors' licensing of
intellectual property in this ECR submission may be directed to legal@cablelabs.com.
This Engineering Change has the following file(s) attached.
Type of Attachment(s) (Visio, Word, txt,
.yang, etc.)
File Name of Attachment(s)
DETAILED DESCRIPTION OF PROBLEM:
There is some ambiguity between the MULPI spec and the PHY spec regarding the assignment of excluded
subcarriers for OFDMA channels. The PHY spec section 7.2.5.3 specifies lower and upper subcarriers that cannot
be used for the active spectrum. The MULPI spec states that all subcarriers not specified in the UCD as unused or
excluded are to be used as part of the minislot mapping. This leaves some ambiguity as to whether or not the UCD
needs to include the lower and upper subcarriers in PHY 7.2.5.3. To avoid potential interoperability issues between
CMs and CMTSes, this ECR requires the CMTS to include the upper and lower subcarriers in the exclusions
specified as part of the UCD.
Similarly, there is some ambiguity between the MULPI spec and the PHY spec regarding the assignment of
excluded subcarriers for OFDM channels. The PHY spec section 7.2.5.1 specifies lower and upper subcarriers that
cannot be used for the active spectrum. This leaves some ambiguity as to whether or not the OCD needs to include
the lower and upper subcarriers in PHY 7.2.5.1. To avoid potential interoperability issues between CMs and
CMTSes, this ECR requires the CMTS to include the upper and lower subcarriers in the exclusions specified as part
of the OCD.
CHANGE DETAILS FOR THE SPECIFICATION:
Complete Engineering Change details for the specification are contained in the following embedded file:
eChangeMULPIv3.114.1213-2.docx
End of Request
Additional Instructions to EC Author
Embed_Doc_TrkChg_
Instr.docx
DOCSIS_3.1_Spec-TestPlan_EC-Form_5-2014.docx
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In submitting the Engineering Change Request ("ECR"), the Author(s) [primary author, additional authors, and contributors], individually and as
an authorized representative of the Company, agrees that if CableLabs incorporates this ECR in whole or in part into the relevant Specification,
all intellectual property in the ECR shall be licensed royalty free, and without confidentiality, under the terms of the "Data Over Cable Service
Interface Specifications License Agreement" ("Contribution Agreement"). CableLabs may disclose the content of this ECR to CableLabs'
members and such others as is necessary for the development of CableLabs' specifications. Questions about the Authors' licensing of
intellectual property in this ECR submission may be directed to legal@cablelabs.com.