:orphan:

Black Channel: General Black Channel type 1 - Point-to-Point
============================================================

.. blch:: General Black Channel type 1 - Point-to-Point
   :id: BLCH0002
   :tags: blch
   :date: 2025-07-28
   :status: PASS

Overview
========

The GBC1 (General Black Channel type #1) implements a point-point duplex protocol between two simplifiers.
The simplifier uses uart communication, to send fixed size packets to the other end.
The protocol is completely symmetrical, there is no master/slave.
Timestamps are incoporated in the packet, and the round-trip time is measured accurately.
This round-trip is used as worst case estimation of one way delay.


Tables
======

The black channel fulfills 61508-2 and 61784-3:2021, justified in this document, together with the RER calculations.

.. csv-table:: 61508-2:2010 7.4.11.1 requirements
   :file: blch0002_resources/61508_2_7_4_11.csv
   :widths: 25 25 15 25
   :header-rows: 1

.. csv-table:: 61784-3:2021 Annex D - Verification of safety measures
   :file: blch0002_resources/61784_3_annex_d.csv
   :widths: 25 25 15 25
   :header-rows: 1

.. csv-table:: 61784-3:2021 5.4 - Deterministic remedial measures
   :file: blch0002_resources/61784_3_5_4.csv
   :widths: 25 25 15 25
   :header-rows: 1

Residual Error Rate
-------------------
RER requirements are stated in 61784-3:2021, 5.8.5.
Reference the :download:`RER <../resources/FSD351 Residual Error Rate.ods>` for detailed calculation.
Radio communication is handled in sheet "3. GenBlackChannel".

Revision History
****************

.. list-table::
   :header-rows: 1

   * - Date
     - By
     - Version
     - Description

   * - 2025-08-01
     - Jesper Ribbe
     - V01
     - Initial version