- An optional system expansion device.
- Allows an ECU-224 desk controller to be connected to an ECU-4, 8 or 16 SigTEL controller to simplify call handling on larger SigTEL applications.
- Mounts inside an ECU-4, 8 or 16 (can also be used to network the ECU-4, 8 or 16 to another controller if required).
- Not compatible with ECU-8NT controllers.
- See schematic/full instructions for further details.
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