IEC TR 62343-6-11:2019

Dynamic Modules - Part 6-11: Design guidelines - Software and hardware interface for optical multicast switches

IEC/TR 62343-6-11: 2019 which is a Technical Report, proposes a software and hardware interface for the optical multicast switch (MCS). This switch can be controlled by resident firmware within the interface that is intended to enable a user or host to retrieve the switch status and/or adjust relevant switch settings. The MCS is defined in IEC 62343-3-4. The technical information regarding MCS and its applications in dense wavelength division multiplexing (DWDM) systems is described in IEC TR 62343-6-4. The objective of this document is a proposal for a software and hardware interface standard of MCS.

General Information

• Status: Published
• Publication Date: 12-Nov-2019
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: SC 86C - Fibre optic systems, sensing and active devices
• Current Stage: PPUB - Publication issued
• Start Date: 13-Nov-2019
• Completion Date: 11-Nov-2019

Overview - IEC TR 62343-6-11:2019 (Optical Multicast Switch Interfaces)

IEC TR 62343-6-11:2019 is a Technical Report that proposes a standardized software and hardware interface for the optical multicast switch (MCS). The MCS is a dynamic module used primarily in ROADMs to implement colourless, directionless and contentionless (CDC) functions in DWDM systems. The report defines how resident firmware exposes switch status and control to a host, and consolidates survey responses and candidate specifications (including pinout, connector form, power, reset and alarm behavior). Detailed interface examples and command-set guidance are provided in Annex A.

Key Topics and Technical Requirements

• Control model: MCS controlled by resident firmware enabling host access to status and switch settings.
• Hardware connector: Recommended Samtec 60‑pin, 2 mm pitch male connector (TMMH series), with guide poles and selectable lead shape to suit line-card mechanics. (Annex A contains connector appearance and pin mapping.)
• Power supply: Summarized specification requests 5.0 V as the primary supply; vendors may reserve pins for additional rails (examples include optional 3.3 V or +15 V).
• Communication interfaces: Proposes use of both I²C (I C) and UART (LVTTL) as primary interfaces. RS‑232C is referenced in some responses as optional. Annex A covers I²C/I2C‑DATA and I²C‑CLK pins, UART Rx/Tx mapping and logical voltage ranges.
• Command sets & formats: Combines survey inputs into a recommended command list, communication parameters and alarm FIFO behavior. I²C implementation is guided to follow referenced I²C conventions.
• Reset & alarm functions: Defines hardware and software reset behaviors, watchdog (WDT) notification for CPU abnormalities, and alarm reporting for key components (flash ROM, SDRAM, FPGA, oscillators, PLC/MEMS drive faults, power supply and internal temperature).

Applications and Who Uses It

• ROADM and DWDM system designers who integrate MCS modules for optical branching and reconfiguration.
• Module manufacturers implementing MCS firmware/hardware interfaces to ensure interoperability with host line cards.
• System integrators and network equipment vendors building colourless, directionless, contentionless architectures.
• Firmware, hardware and test engineers responsible for command sets, pin mapping, alarm handling and verification.
• Standards and procurement teams seeking consistent module specifications for multi‑vendor deployments.

Practical benefits include easier module interchangeability, reduced integration time, standardized debug and alarm semantics, and clearer supplier-host contracts.

Related Standards

• IEC 62343-3-4 - definition of the optical multicast switch (MCS).
• IEC TR 62343-6-4 - technical information on MCS applications in DWDM systems.

For implementation details, connector drawings, pin assignments, voltage ranges, command examples, reset types and alarm definitions, consult Annex A of IEC TR 62343-6-11:2019.

Standards Content (Sample)

IEC TR 62343-6-11 ®
Edition 1.0 2019-11
TECHNICAL
REPORT
colour
inside
Dynamic Modules –
Part 6-11: Design guidelines – Software and hardware interface for optical
multicast switches
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IEC TR 62343-6-11 ®
Edition 1.0 2019-11
TECHNICAL
REPORT
colour
inside
Dynamic Modules –
Part 6-11: Design guidelines – Software and hardware interface for optical

multicast switches
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-7526-9

– 2 – IEC TR 62343-6-11:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 6
4 Survey results . 7
4.1 Survey contents . 7
4.2 Survey conditions . 7
4.3 The analysis of responses . 7
4.4 Future direction . 9
Annex A (informative) Hardware and software interfaces . 10
A.1 Hardware interfaces . 10
A.1.1 Electrical connector . 10
A.1.2 Pin assignment and functions . 10
A.2 Software interfaces . 13
A.2.1 General . 13
A.2.2 UART communication . 13
A.2.3 I C communication . 13
A.2.4 Command sets . 14
A.2.5 Reset . 14
A.2.6 Alarm . 15
Bibliography . 16

Figure A.1 – Connector appearance . 10

Table 1 – Analyzed results of software and hardware interface . 7
Table 2 – Analyzed results of communication formats . 8
Table A.1 – Connector form . 10
Table A.2 – Pin assignment . 11
Table A.3 – Explanation of functions . 12
Table A.4 – Power supply voltage range . 13
Table A.5 – Logical pin voltage range . 13
Table A.6 – Communication command . 14
Table A.7 – Reset type and interface . 14
Table A.8 – Alarm functions . 15

IEC TR 62343-6-11 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DYNAMIC MODULES –
Part 6-11: Design guidelines – Software and hardware
interface for optical multicast switches

FOREWORD
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data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62343-6-11, which is a Technical Report, has been prepared by subcommittee 86C: Fibre
optic systems and active devices, of IEC technical committee 86: Fibre optics.
The text of this Technical Report is based on the following documents:
Draft TR Report on voting
86C/1604/DTR 86C/1612/RVDTR
Full information on the voting for the approval of this Technical Report can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC TR 62343-6-11:2019 © IEC 2019
A list of all parts in the IEC 62343 series, published under the general title Dynamic modules,
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IEC TR 62343-6-11 © IEC 2019 – 5 –
INTRODUCTION
An optical multicast switch (MCS) is a dynamic module that is mainly used in a reconfigurable
optical add-drop multiplexer (ROADM) to realize a colourless, directionless and contentionless
(CDC) function. The MCS functions as an optical switch and a non-wavelength dependent
branching device. It is electrically controlled with software, which directs an input signal from
one input port to the required output port. This document clarifies MCS software and hardware
interfaces, which were investigated based on results from a survey by Dynamic Module Sub-
Committee, Fibre Optic Standardization Committee, and OITDA (Optoelectronic Industry and
Technology Development Association) in 2017. The questionnaire was sent to 24 appropriate
companies all over the world via their representatives. Responses from six companies including
three specific proposals for a specification were received.

– 6 – IEC TR 62343-6-11:2019 © IEC 2019
DYNAMIC MODULES –
Part 6-11: Design guidelines – Software and hardware
interface for optical multicast switches

1 Scope
This part of IEC 62343, which is a Technical Report, proposes a software and hardware
interface for the optical multicast switch (MCS). This switch can be controlled by resident
firmware within the interface that is intended to enable a user or host to retrieve the switch
status and/or adjust relevant switch settings. The MCS is defined in IEC 62343-3-4. The
technical information regarding MCS and its applications in dense wavelength division
multiplexing (DWDM) systems is described in IEC TR 62343-6-4. The objective of this
document is a proposal for a software and hardware interface standard of MCS.
2 Normative references
There are no normative references in this document.
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
There are no terms or definitions in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.2 Abbreviated terms
DWDM dense wavelength division multiplexing
EEPROM electrically erasable programmable read only memory
FPGA field programmable gate array
I C inter integrated circuit
LVTTL low voltage transistor-transistor logic
MCS optical multicast switch
MEMS micro electro mechanical systems
MPU microprocessor
O.C. open collector
PLC planar lightwave circuit
ROM read only memory
SDRAM synchronous dynamic random access memory
UART universal asynchronous receiver transmitter

IEC TR 62343-6-11 © IEC 2019 – 7 –
4 Survey results
4.1 Survey contents
The survey asked for a proposal for a software and hardware interface specification for an
optical multicast switch for the purpose of standardization. It was not necessary for the
respondent to be related directly to the multicast switch product, its application or its
development.
4.2 Survey conditions
The survey was distributed to 24 companies including suppliers and users from December 15,
2015 to February 8, 2016. The responses were collected in a free format.
4.3 The analysis of
...