Interpreting the design

An explanation of some common ways to interpret FOND output.

We'll be using a lot of terminology specific to FOND, so we recommend checking out our network design elements glossary if you haven't already. 

Selecting the layers you need

Let's start by turning off the layers you don't need to see, you can do this over in the legend. Clicking on a layer name toggles it on and off. This will make it easier to click on the features that we're really interested in.

We'll start by turning off everything except the Drop Hub, Drop Cables, and Addresses.

FOND_map_drop_only

Inspecting the Drop network

Selecting the layers above allows us to inspect the Drop network. Some things to look for here:

  • Are the Drop Hubs serving as close to their maximum as possible (within the maximum distance cutoff)?
  • Are there any drops that are too long due to address points being far away from the underground path or poles? Sometimes this is only apparent once you look at the design.

You can check how much demand each Drop Hub is serving by counting the Demand assigned to each Hub by each of the Drop Cables. Alternatively, you can just look at the attributes of the Hub by clicking on the feature and reviewing the Demand field.

Screenshot 2020-05-13 at 17.15.04

Inspecting the Distribution network

After looking at the Drop network, inspect the Distribution one. It's useful to be able to understand how everything ties together. To see how a Drop Hub is connected back to the Distribution Hub, we can follow the relationships defined by the StartID and EndID of Cables and the FondID of Hubs. The StartID corresponds to the FondID of whatever Hub the cable starts at. For example, a Distribution Cable to come out of a Hub with FondID of DISTRIBUTION_HUB_0014 will have a StartID of DISTRIBUTION_HUB_0014. The cable's EndID then shows the next element downstream. In the example below, this Distribution cable starts at a Splice, DISTRIBUTION_SPLICE_0014 and ends at a Drop Hub, DROP_HUB_0070. 

Screenshot 2020-05-13 at 13.35.25

 

Where Distribution cables branch, there will be a Splice on the map. Drop Hubs are spliced into Distribution cable, with multiple Drop Hubs on each Distribution Cable

If your architecture uses Connectorized Drop Hubs, you will also see another Cable type: Drop Hub Tail Cable. This lies between the Drop hub and a splice in the Distribution tier.

Screenshot 2020-05-13 at 17.21.08