Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

Symbols

Firewall symbol

A firewall controls traffic between network zones according to rules, and is drawn on network diagrams as a brick wall block. Industrial drawings place it between the corporate network and control networks or between a remote access link and the plant.

Drawing use: Schematic
Application: Installation & communications
Reference family: IEC

A distinction that matters

A router connects networks; a firewall filters traffic by policy, even when both are in one device.

Full reference

RTR

Symbols

Network router symbol

Routers forward traffic between separate networks, such as a plant network and a remote access link. Drawings commonly use a circle with four outward arrows. Industrial routers may also include cellular modems and firewall functions.

Drawing use: Schematic / GA
Application: Installation & communications
Reference family: IEC

A distinction that matters

A switch forwards within one network; a router connects networks and often enforces security policy.

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.