Fiber cables and fiber structure

Inspect a fiber cable's tube and fiber layout, connection status and optical profile.

Last updated: 10 November 2026

Cable, tube and fiber

A fiber cable is a line record with start and end points on the map. A tube groups the cable's fibers; a fiber is the individual element through which a connection is traced. The Turkish interface uses both “lif” and “kıl” for fiber in different actions.

A cable appearing close to a point on the map does not mean it terminates there. Its start and end nodes determine the connection. See Drawing and editing for drawing steps.

Edit cable details

1. Select the cable on the map and enable Edit mode.
2. Select Edit attributes in the cable card.
3. Enter Fiber count and Buffer tube count to match the actual cable. Complete Cable class, Installation, Status and any required descriptions.
4. Enter Measured length or Design length if known. Cable slack and Vertical risers are separate fields; edit them with regard to the source of the length being used.
5. Select Save and check Fiber structure.

When a record has no fiber count, its cross-section assumes 12 fibers and displays a warning. Correct the value before treating the display as the actual fiber provision. If tube count is blank, fibers are distributed using 12 fibers per tube. With a layout calculated from the entered total fiber and tube counts, the last tube may contain fewer fibers. The highest supported fiber count is 1,728.

Read colours and occupancy

Tube and fiber colours follow this sequence: blue, orange, green, brown, grey, white, red, black, yellow, violet, pink and turquoise. The sequence repeats when needed; use both fiber and tube numbers to identify a record.

The cross-section and fiber buttons under Fiber structure show Both ends connected, Connected at one end or Free, based on saved connections. Occupancy is calculated from splice and port connections at the cable endpoints. Changing the Fibers in use attribute does not create a connection.

Select a fiber to open Fiber trace. It shows endpoints, distance and estimated loss along the connection. Use Show trace on map to focus on the relevant lines. A trace ends at an OLT or OLT card PON port; it may branch through a splitter. Closed loops and reaching the display boundary are reported separately.

Estimated trace loss is separate from the optical budget. Distance follows the priority between measured length, design length, the saved route and the map estimate; quantities explains this distinction.

Assign an optical profile to a cable

1. Select Cable optical profile in the cable card.
2. Choose the appropriate Loss / fiber profile. Use No cable-specific profile when no specific assignment is required.
3. Select Save.

The profile determines the cable's loss basis in optical calculations; it does not change fiber count, tube layout or connections. Fiber measurements lets you add a measurement to a specific cable endpoint of the selected fiber. See Fiber assignment for assignment and reservation details.