# Cable Redundancy

The EC-Simulator supports Cable Redundancy by using two Network Interfaces to provide the Redundancy feature.
Frames are sent from and received on both interfaces.

The EC-Simulator HiL automatically connects the red adapter to a matching port within the simulated network topology.
An explicit connection can be set using [`EC_T_SIMULATOR_INIT_PARMS::aoDeviceConnection`](api_general.html.md#_CPPv4N25EC_T_SIMULATOR_INIT_PARMS18aoDeviceConnectionE) at [`esInitSimulator()`](api_general.html.md#_CPPv415esInitSimulator10EC_T_DWORDPK25EC_T_SIMULATOR_INIT_PARMS) .

## Running EcSimulatorHilDemo with Cable Redundancy

### Linux (EcSimulatorHilDemo)

- Starting EcSimulatorHilDemo with two links configured

```console
$ cd /opt/EC-Simulator/Bin/Linux/x64
$ ./EcSimulatorHilDemo -f exi.xml -intelgbe 1 1 -intelgbe 2 1 -perf
```

### EcSimulatorHilDemoPython

- Script arguments for `Examples/EcSimulatorHilDemoPython/EcDemoApp.py` with two links configured:

```console
$ -mode 4 -file exi.xml -time 20000 -lvl 3 -link "intelgbe 1 1" -linkred "intelgbe 2 1"
```

#### IMPORTANT
The MainDevice has restrictions in case of cable redundancy, e.g. it is not allowed to use LRW EtherCAT® commands.