update #9

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## What's next?

## Probe further

 -  See examples of exposing operators via OpenSlice:

 	- [Exposing Kubernetes Operators as a Service : Offering "Calculator as a Service" through OpenSlice](../../service_design/examples/ExposingCRDs_aaS_Example_Calculator/ExposingCRDs_aaS_Example_Calculator.md)

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# What's next

# Probe further

Installing OpenSlice. See the [Deployment](deployment.md) of OpenSlice

Lear more on [how OpenSlice supports Network as a Service(NaaS)](./naas/introduction.md)

Who is implementing OpenSlice? See [OSL ETSI SDG](https://osl.etsi.org/)

How OpenSlice works? See the [Architecture](./architecture/architecture.md) of OpenSlice

* Installing OpenSlice. See the [Deployment](deployment.md) of OpenSlice

* Learn more on [how OpenSlice supports Network as a Service(NaaS)](./naas/introduction

* Who is implementing OpenSlice? See [OSL ETSI SDG](https://osl.etsi.org/)

* How OpenSlice works? See the [Architecture](./architecture/architecture.md) of OpenSlice

The following figure displays the different phases that the rules are performed, during the lifecycle of a Network Slice Instance.

[![Rules in NSI](../images/lcm/lcmfig1.png)](../images/lcm/lcmfig1.png)

[![Rules in NSI](./images/lcm/lcmfig1.png)](./images/lcm/lcmfig1.png)

* PRE_PROVISION rules: Run only once just before creating a service with a given priority. 

* CREATION rules: Run while the referenced service dependencies of a service are created

# Generic Slice Template as a Service Specification

## Intended Audience: Service Designers

GSMA Generic Slice Template (GST) Defines customer-oriented service requirements, E.g. Availability, Area of service, delay tolerance, etc. and attempts to narrow down the gap between (network) service customers and vendors

Moreove it Proposes standardized Network Slice Templates (NESTs) to target specific use cases

In OpenSlice we made an effort and translated the GST to a Service Specification model. So Service Designers can use it as a template to design a new Service.

The image illustrates the relationship between the GSMA Generic Slice Template (GST), TM Forum Service Specification, and how they are utilized within OpenSlice to offer network services.

[![gst_to_gsma](./gst_to_gsma/img01.png)](./gst_to_gsma/img01.png)

The GST to TM Forum via OpenSlice:

        * GST Attributes List: A comprehensive list of service attributes, such as availability, delay tolerance, downlink throughput, energy efficiency, isolation level, mission-critical support, and many others.

        * TMF Service Specification: Demonstrates the transformation of GST attributes into a TM Forum service specification, showing JSON code snippets that define service parameters.

        * Offered Service based on GST: Represents the final offered service, an example of a GST-based service shown as an entry in a catalog, ready to be consumed by customers.

What was our flow:

    * Started with defining service requirements and attributes using GST.

    * Translated these GST attributes into a formal TM Forum service specification.

    * Service Offering in OpenSlice: The service specification is then used to create and offer a specific network service within OpenSlice, available for customer selection and deployment.

## Probe further

See v9 of the  GST model in GSMA [here](https://www.gsma.com/newsroom/wp-content/uploads//NG.116-v9.0-1.pdf)

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