# Simultaneous bidirectional propagation qualifier

Canonical URL: https://eloragrid.ai/symbols/iec-simultaneous-bidirectional-propagation-qualifier
Publisher: Elora Grid
Updated: 2026-10-14
Lookup label: Q020502
Drawing use: Schematic
Reference families: IEC, Manufacturer

## Symbol convention

Convention: IEC
Form: Simultaneous bidirectional propagation qualifier
Autodesk IEC-60617 Symbol Preview — Propagation and signal-flow qualifiers; vendor family reference, not certified IEC geometry or database identifier.

This qualifier distinguishes a path supporting propagation in both directions at the same time.

## What it represents

This qualifier distinguishes a path supporting propagation in both directions at the same time. The represented interface supports sending and receiving in opposite directions simultaneously. That operating relationship is separate from the physical media and protocol.
A communications drawing should identify each endpoint and the actual interface. The qualifier supplies a direction relationship without declaring a network implementation.

## How to read it

- State the interface and communication arrangement represented.
- A bidirectional graphic does not specify a communication protocol or throughput.

## Information to show or reference

- Identify the associated device, circuit or diagram boundary.
- State the interface and communication arrangement represented.
- Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form.

## Important distinction

A bidirectional graphic does not specify a communication protocol or throughput.

## Facts

- Reference scope: Specific public IEC-context family form
- Publisher reference token: Q020502 (Autodesk token; not a verified IEC database ID)
- Information added: State the interface and communication arrangement represented.
- Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic

## Public references

- [Autodesk IEC-60617 preview: Propagation and signal-flow qualifiers](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1C0C7AE2-F703-4283-BCB1-3E0B30882715.htm) — Autodesk. Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.