Simultaneous bidirectional propagation qualifier

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.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.

Entry JSON · Entry Markdown · Last editorial update: 14 October 2026