1. Problem Statement Controlling pre-standard coherent Optical Interfaces
draft-many-coherent-dwdm-if-control-00
Gert Grammel Juniper Networks
Ruediger Kunze Deutsche Telekom
Oscar Gonzalez de Dios Telefonica
Gabriele Galimberti Cisco Systems
Dharini Hiremagalur Juniper Networks
November 2016
IETF 97 - Seoul

2. Motivation
The growth of the Internet demands for higher interface rates and DWDM to interconnect Routers.
Coherent Transceivers to carry 40G, 100G and 400G are available in the industry, but lack a common data-model to control them
So why not just do it?
Extending parameters and definitions used for standard non-coherent transceivers has proven to be contentious
No firm date by when a standard could become available.
Standards bodies are still struggling to document parameters which are required to characterize coherent DWDM interfaces
A standard-track data model would require those parameters being identified and considered.
November 2016
IETF 97 - Seoul

3. Document Scope
A problem statement document is not explicitly required by the IETF but helps guiding a group of drafts
The document motivates the need for a pre-standard coherent optical (RRESCO) interface model
It particularly sets out a framework of what is NOT in its scope:
PRESCO is NOT suggesting to perform data-plane work in IETF.
PRESCO is NOT providing data models for non-PRESCO interfaces
PRESCO does NOT propose to utilize Data models defined for PRESCO modules to be re-used for standard models when those become available
PRESCO does NOT suppose multi-vendor compatibility of PRESCO- Modules on data plane. I.e. a pair of PRESCO-DWDM interfaces having identical parameter sets describing the data-plane MAY not be compatible.
November 2016
IETF 97 - Seoul

4. What to expect
PRESCO is not aiming for a Science Experiment but sets out to document a model that is good enough to run a network using pre-standard Coherent DWDM interfaces
Control work for PRESCO SHALL have the status INFORMATIONAL
A PRESCO model SHOULD be based on control parameters available and commonly used in controlling DWDM modules
PRESCO modeling SHOULD aim to align with existing data models in IETF and SHALL allow implementers to select augmentation of parameters by vendor specific extensions
Since the full set of parameters needed to characterize PRESCO modules and their encoding are to be defined, application codes are not available for use in PRESCO and controlling PRESCO Modules SHALL NOT mandate using application codes
the accuracy of measurement values MAY depend on implementation. Hence a protocol SHOULD be able to trim measured values to a normal to make them comparable across implementations.
threshold levels derived from measurement values SHOULD be adjustable such that a comparable system behaviour can be achieved.
November 2016
IETF 97 - Seoul

5. Next steps Clean up typos and redundant text
Start discussion how to progress with the problem statement
Keep it as individual draft
Drop it and continue with PRESCO models without the problem statement
Merge it with one of the PRESCO Model drafts emerging
Make it a WG document aiming for an informational RFC
Merge it with the (informational) framework document draft-ietf-ccamp-dwdm-if-mng-ctrl-fwk-02
Other?
November 2016
IETF 97 - Seoul