[CCAMP] draft-ietf-ccamp-optical-impairment-topology-yang: new paragraph added to sub-section 2.5.2
Dieter Beller <Dieter.Beller@nokia.com> Tue, 15 December 2020 08:23 UTC
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From: Dieter Beller <Dieter.Beller@nokia.com>
Organization: Nokia
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Date: Tue, 15 Dec 2020 09:23:23 +0100
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Subject: [CCAMP] draft-ietf-ccamp-optical-impairment-topology-yang: new paragraph added to sub-section 2.5.2
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Hi all, following my action item, I drafted an additional paragraph at the end of sub-section 2.5.2 (text in blue below). We can discuss it during our meeting later today. 2.5.2. Organizational Modes Organizations like operator groups, industry fora, or equipment vendors can define organizational modes, which will allow these organizations to make use of advanced transceiver capabilities going beyond existing standardized application codes. Such an organizational mode is identified by the organization-identifier attribute defining the scope and an operational-mode that is meaningful within the scope of the organization. Hence, the two attributes must always be considered together. Two transceivers are inter-operable, if they have at least one (organization-identifier, operational-mode) pair in common and if the supported carrier frequency and power attributes have a matching range. This is a necessary condition for path computation in the context of organizational modes. An operational mode is a transceiver preset (a configuration with well-defined parameter values) subsuming several transceiver properties including: o FEC type o Modulation scheme o Encoding (mapping of bit patterns (code words) to symbols in the constellation diagram) o Baud rate (symbol rate) o Carrier bandwidth (typically measured in GHz) The major reason for these transceiver presets is the fact that the attribute values typically cannot be configured independently and are therefore advertised as supported operational mode capabilities. It is the responsibility of the organization to assign operational modes and to ensure that operational modes are unique and not ambiguous within the scope of the organization. In addition to the transceiver properties subsumed by the operational mode, optical power and carrier frequency related properties are modeled separately, i.e., outside of the operational mode. This modeling approach allows transponders using different transceiver variants (e.g. optical modules) with slightly different power and/or frequency range properties to interoperate without defining separate operational modes. Different optical modules (pluggables) from different suppliers typically have slightly different input and output power ranges or may have slightly different carrier frequency tuning ranges. The received channel power and the received total power are two parameters that can be measured by the receiver and can be provided by the transceiver in order to allow a controller to determine the expected performance of the end-to-end service taking into account the optical impairments along the path. An organization may define the operational modes to include the optical power and carrier frequency related properties following the application code approach as defined in ITU-T Recommendation G.698.2 [G.698.2]. In such a case, the explicit optical power and carrier frequency related optional attributes shall be omitted in order to avoid redundant information in the description of the transceiver capabilities. If these attributes are provided in addition to the operational modes including these attribute values implicitly, the parameter values provided explicitly replace the implicit values and take precedence. This shall, however, only be an done in exceptional cases and shall be avoided whenever possible. In summary, the optical power and carrier frequency related attributes shall either be described implicitly by the operational mode following the definition provided by that organization or shall be described explicitly when the optical power and carrier frequency related properties are not included in the operational mode definition. Thanks, Dieter
- [CCAMP] draft-ietf-ccamp-optical-impairment-topol… Dieter Beller