Designing and assigning a GPON broadband service

  • Release version: Yokohama
  • Updated January 30, 2025
  • 5 minutes to read
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    Summary of Designing and assigning a GPON broadband service

    The GPON Broadband Service change model in ServiceNow enables you to automate and manage the design, inventory allocation, and fulfillment of Gigabyte Passive Optical Network (GPON) broadband service orders. This model supports efficient network expansion by guiding the end-to-end change request execution process for GPON broadband services.

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    Change Execution Process

    The process to fulfill a GPON broadband service request involves a defined sequence of tasks:

    • Create the change request: Initiate the request using the GPON Broadband Service change model.
    • Path compute and create logical connection: Identify possible network paths between sites and establish logical connections.
    • Create a logical connection: Select interfaces tied to the designated equipment models for start (A) and end (Z) points.
    • Create a physical connection: Configure inventory equipment connections at physical layer between A and Z ends.
    • Add interface cards: Specify site, equipment model, and slot for interface cards.
    • Create equipment: Instantiate and validate equipment records at network sites.

    Completing these steps successfully results in the design and assignment of the GPON broadband service.

    Path Computation Details

    An internal path computation function automatically determines feasible network paths based on parameters entered during change tasks. Key points include:

    • Five default change tasks are created when the GPON Broadband Service change request is saved.
    • Path computation scenarios handle availability of physical connections, with failure conditions if certain physical links are already used.
    • Logical connections and VLAN path searches are validated, with failures if link aggregation groups (LAG) are involved.
    • The computation uses record producers to collect required data, focusing on equipment models and connection types at A and Z ends.
    • Conditions required for path computation include valid equipment hierarchy, site associations, physical and logical connection models, and populated ports with available status to avoid resource conflicts.

    This mechanism ensures accurate and conflict-free network path determination essential for service fulfillment.

    Practical Benefits for ServiceNow Customers

    • Automates complex network design and assignment workflows for GPON broadband services.
    • Ensures consistent inventory management aligned with physical and logical network configurations.
    • Provides built-in validation and error handling during path computation to minimize deployment issues.
    • Facilitates efficient handling of customer orders and network expansion requests with a structured change management approach.

    With the Gigabyte Passive Optical Network (GPON) Broadband Service change model, you can create an automated set of tasks to fulfill a GPON broadband order request.

    GPON Broadband Service overview

    As a product manager, you can use the GPON Broadband Service change model to design and allocate your inventory for GPON broadband services. With this model, you can fulfill your customer orders and requests for your network expansion.

    Change execution process for GPON Broadband Service request

    The change request execution process includes the task stages that you need to complete for the GPON Broadband Service request. You must do these task stages in the following sequence to successfully complete the request.
    Create the change request
    Create the change request by using the GPON Broadband Service change model. To learn more, see Create and execute a change task in Telecommunications Network Inventory. .
    Path compute and create logical connection
    Identify the possible paths between the network sites and create a logical connection between each site. To learn more, see the next section in this topic called "Path computation for the GPON Broadband Service change model."
    Create a logical connection
    Add similar sets of site selection fields for the physical and logical connections between your start (A) and end (Z) locations. You can only select those interfaces that are associated with the designated equipment model for the A- and Z-end interfaces. To learn more, see Change request and change task forms .
    Create a physical connection
    Add similar sets of site selection fields for the physical and logical connections between your start (A) and end (Z) locations to configure your inventory equipment. You can only select those interfaces that are associated with the designated equipment model for the A- and Z-end interfaces. To learn more, see the next section in this topic called "Path computation for the GPON Broadband Service change model."
    Add an interface card
    Select a site and equipment model when you add interface cards. Use the Slot field to select the slot that you want to add to the equipment model. To learn more, see Change request and change task forms.
    Create equipment
    Select a network site and equipment model for your equipment instantiation. The instantiation process is when you generate and validate the equipment records at the site level. To learn more, see Change request and change task forms and Change request and change task forms.

    After you complete this sequence, you can complete the design and assign procedure for the GPON broadband services.

    To execute this process successfully, you need to consider a set of conditions as well as scenarios. To learn more, see the next section in this topic called "Path computation for the GPON Broadband Service change model.".

    Path computation for the GPON Broadband Service change model

    An internal path computation function is part of the GPON Broadband Service change model. Its purpose is to identify the possible paths between your network sites. This computation is based on the parameters that you enter when you complete each change task that is associated with the GPON Broadband Service change model.

    When you create the change request with the GPON Broadband Service change model and save the request, five default change tasks are created. To learn more, see Design your GPON Broadband Service.

    The following scenarios are handled in the path computation when you execute the process to complete the GPON broadband service request:
    • When all physical connections are available, the Passive Optical Network (PON) access path is created.
    • If the physical connection between the splitter and PFP is used, the PON access path fails.
    • If all physical connections are available, the PON network path is created.
    • If a physical connection between OLT and FDP is used, the PON network path creation fails.
    • If all logical connections are shared, the VLAN path search can create the connection.
    • If a link aggregation group (LAG) path is used, the VLAN path search fails.
    The path computation uses record producers in each change task that is associated with the GPON Broadband Service change model to collect the required data. It collects most of its connection data when you complete the Compute and Create logical connection change task that you created from a GPON Broadband Service change model.
    1. The path search is between the equipment model that you specified for the A connection end of the connection and the equipment model that you specified in the Z end connection.
    2. The path search is between the equipment model that you specified for the A connection end of the connection and the equipment type that you specified in the Z end connection.
      • The logical connection model indicates what model of logical connection must be created after the path computation.
      • The bandwidth refers to the bandwidth table.
      • The allowed physical connection model captures the physical connection CI model, which can be used to find a path and is added in the path element.
    The path computation works on the following conditions:
    1. The equipment hierarchy up to the interface has a Contains:: Contained By relationship that is updated when you instantiate the piece of equipment by using the Create Inventory Equipment change model.
    2. The equipment is related to the network site. This condition is also enforced when you instantiate the piece of equipment by using the Create Inventory Equipment change model.
    3. The physical connection that you create between the interfaces is associated with valid models.
    4. When you create a physical connection by using the Create Physical Connection change model, a CI relationship is created between the sites.
    5. The logical connection that you create between the interfaces is associated with valid models.
    6. When you create a logical connection by using the Create Physical Connection change model, a CI relationship is created between those sites.
    7. Connection elements are added for the logical connections. These elements should be valid physical connections between the sites when the computation performs the path search.
    8. Port A and Port Z must be populated for the physical and logical connections.
    9. The Availability field for the physical and logical connections must be available to qualify those connections as possible underlying paths for routing. This validation ensures that a resource is not used multiple times.

    To learn more about errors occur in the path computation, see Path computation error messages.