Creating a drop

When planning drops in the duct area, work steps have to be carried out repeatedly in the same way. If an individual microduct is to be introduced into each building, the planner can use the “Create drop” workflow for this purpose. Different, freely selectable options allow the user to plan an optimal empty-duct variant according to the customer-specific requirements and local conditions. The necessary FO cables can also be planned according to the living and business units to be connected.

Topics in this section are: Procedure, Processing stages and setting the Planning options.


Start the workflow in Workflow Explorer > Planning workflows > Create drop by double-clicking it, from the context menu or by clicking the “Run” button in the lower right area of the workflow explorer:


or on the NET Planning tab in the “Design Wizard” group:


The following dialog box opens.


1. The duct or trench can be selected in the graphic.
2. The selected trench including ducts and subordinate ducts is displayed.
3. The option of which duct is to be inserted into the building can be selected.
4. The cluster in which the drop is located can be selected.
5. The point where the duct starts and into which the duct must be inserted can be selected.
6. The options for the location of the drop trench may be specified.
7. The cross-section template for the drop trench can be selected.
8. Further options for the workflow can be specified by clicking on the button. A dialog opens for specifying the planning options for duct and cable, as they are also used in the FTTx Design Wizard.

Processing stages

mceclip9.png First, the user is asked to select from the graphic the trench or duct from which drops should be created.
mceclip8.png Both the selected trench and its occupancy with ducts and microducts are displayed in a tree view. The yellow coloring of the symbols indicates that subordinate objects are still present for the corresponding feature.
mceclip7.png Depending on the option selected, NET uses
  • the selected duct and thus creates a drop or
  • the program determines the next free subordinate duct to the selected duct and introduces it into the building as a drop duct.
mceclip6.png The cluster in which the drop is located can be selected.
mceclip5.png The user has to select the structural point at which the duct starts. The name of the selected structural point is displayed.

In order for NET to detect that the duct starts in the manhole, etc., it must be inserted into the manhole. You can find more information about this under Adding a duct insertion.

mceclip15.png After selecting the base manhole, the options for determining the location of the drop trench are available. Users have the choice of
  • automatically creating a straight trench from the selected drop point at the house to the base trench,
  • digitizing the drop trench themselves, or
  • selecting an existing trench.
mceclip14.png This is where the trench cross section for the drop trench can be selected.
mceclip13.png This button opens the dialog for defining the planning options for ducts and cables.

Once users have made this choice, the creation of the drops in the graphic is initiated via the OK button.
In the command window, the user is prompted to digitize the drop point in the graphic. (Option: “Automatically create a straight trench”)


The point should be on the building line or inside the building. If the building has address information, this is transferred to the name of the cable section.

  • If the drop trench is already present in the graphic, the user must select the trench.
  • If the “Digitize trench” option is active, the user is prompted to digitize a point on the building and a point on the base trench.

It is possible to enter several drops in succession.

Select the trench section located directly in front of the house as the base trench for the building to be connected.

  • In the course of creating a drop, cable sections and fibers can also be created. The number of fibers is variable and is specified by the user.
  • If cables and fibers are created, it is possible to create a terminator and to attach the fibers to connectors.

Examples of drop trenches

Automatically create a straight trench

Select the point on the building.


The drop trench is created in a straight line from the building to the feeder trench.


All elements specified in the planning options are then created.

Digitize trench

Choose the point at which the drop is to be created.


If the point for the drop is not on a line/point of the building, the building to which the drop is to be assigned must then be selected in the graphic.


Select a point on the feeder trench.


All elements specified in the NET options are then created.


Trench already exists

Select the end point of the drop trench.

If you are asked for the building, select it as well.


All elements specified in the NET options are then created.



The workflow can only work with house service roads that consist of one data set. 

Planning options



Even if no cable is to be planned but only a duct, a cable type must be selected.