Svc::ComSplitter

1. Introduction

The ComSplitter component duplicates a stream of Fw::Com buffers to multiple consumers. Each Com buffer received on its input port is copied and forwarded to every connected output port. A typical use is fanning a single downlink stream out to several sinks, for example a radio path and an on-board logger such as Svc::ComLogger.

2. Requirements

Name	Description	Validation
SVC-COMSPLITTER-001	The ComSplitter component shall forward each Com buffer received on comIn to every connected comOut port	unit test
SVC-COMSPLITTER-002	The ComSplitter component shall pass a copy of the buffer to each output so that consumers cannot affect one another	unit test

3. Design

The ComSplitter is a passive component. The comIn handler executes synchronously on the caller's thread: it iterates over the comOut output port array (5 ports) and, for each connected port, invokes it with a copy of the incoming Fw::ComBuffer. The context value forwarded to consumers is always 0. At least one output port must be connected; the handler asserts otherwise.

3.1 Port Description

Port	Kind	Type	Description
comIn	sync input	Fw.Com	Com buffer stream to split
comOut	output (array of 5)	Fw.Com	Duplicated Com buffer stream

The component has no commands, events, telemetry, or parameters.

4. Usage

1. Instantiate the component in the topology.
2. Connect the source Com stream to comIn.
3. Connect up to 5 consumers to elements of comOut; unconnected elements are skipped.

5. Change Log

Date	Description
2026-08-10	Initial SDD