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  ITU-T A.5 justification information for referenced document CM-SP-R-UEPI-I11-190912 in draft J.216
1. Clear description of the referenced document:
Name: CM-SP-R-UEPI-I11-190912
Title: Remote Upstream External PHY Interface Specification
2. Status of approval:
Approved
3. Justification for the specific reference:
The draft J.216 describes the specifications of second-generation modular headend architecture in systems for interactive cable television services.
4. Current information, if any, about IPR issues:
https://www.cablelabs.com/innovations/patents
5. Other useful information describing the "Quality" of the document:
Widely deployed in a lot of DOCSIS 3.1 implementations under CableLabs certification program
6. The degree of stability or maturity of the document:
Published in September 2019, and very stable
7. Relationship with other existing or emerging documents:
None
8. Any explicit references within that referenced document should also be listed:
2.1 Normative References/
In order to claim compliance with this specification, it is necessary to conform to the following standards and other/
works as indicated, in addition to the other requirements of this specification. Notwithstanding, intellectual/
property rights may be required to use or implement such normative references./
[DEPI] DOCSIS Downstream External PHY Interface Specification, CM-SP-DEPI-I08-100611, June 11, 2010,/
Cable Television Laboratories, Inc./
[DRFI] DOCSIS Downstream Radio Frequency Interface, CM-SP-DRFI-I16-170111, January 11, 2017, Cable/
Television Laboratories, Inc./
[MULPIv3.0] DOCSIS MAC and Upper Layer Protocols Interface Specification, CM-SP-MULPIv3.0-C01-171207,/
December 7, 2017, Cable Television Laboratories, Inc./
[MULPIv3.1] DOCSIS MAC and Upper Layer Protocols Interface Specification, CM-SP-MULPIv3.1-I18-190422, April 22,/
2019, Cable Television Laboratories, Inc./
[IEEE 802.1q] IEEE Std 802.1Q-2003, Virtual Bridged Local Area Networks, May 2003./
[IEEE 802.3] IEEE Std 802.3-2002, Part 3: Carrier Sense Multiple Access With Collision Detection (CSMA/CD) Access/
Method and Physical Layer Specifications, March 2002./
[ISO 13818-1] ISO/IEC 13818-1:2013, Information Technology, Generic Coding of Moving Pictures and Associated Audio/
Information. Part 1: System, May 23, 2013./
[PHYv3.1] DOCSIS Physical Layer Specification, CM-SP-PHYv3.1-I16-190121, January 21, 2019, Cable Television/
Laboratories, Inc./
[R-DEPI] Remote Downstream External PHY Interface Specification, CM-SP-R-DEPI-I13-190912, September 12,/
2019, Cable Television Laboratories, Inc./
[R-PHY] Remote PHY Specification, CM-SP-R-PHY-I13-190912, September 12, 2019, Cable Television/
Laboratories, Inc./
[RFC 791] IETF RFC 791, Internet Protocol-DARPA, September 1981./
[RFC 2460] IETF RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, December 1998./
[RFC 2474] IETF RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers,/
December 1998./
[RFC 3931] IETF RFC 3931, Layer Two Tunneling Protocol - Version 3 (L2TPv3), March 2005./
2.2 Informative References/
This specification uses the following informative references./
[VCCV] IETF RFC 5085 Pseudowire Virtual Circuit Connectivity Verification (VCCV): A Control Channel for/
Pseudowires. T. Nadeau, Ed., C. Pignataro, Ed., December 2007.
9. Qualification of Cablelabs:
10. Other (for any supplementary information):
None
Note: This form is based on Recommendation ITU-T A.5