Model 922-MES
– User Manual
Focal Technologies Corporation
Page 1-1
A Moog Inc. Company
Document No. 922-0662-00, Rev 1.0
1.0
Introduction
A highly reliable managed Ethernet switch is required for use in subsea control networks to provide both copper
and optical links for 10/100/1000 Mbps communications using standard open protocols.
Focal’s Model 922-MES board is a layer 2 managed Ethernet switch (MES) with ten ports capable of
10/100/1000 Mbps link speeds. Two of these ports can be equipped with small form factor (SFP) transceivers
that support Fast (100Base-FX) and Gigabit Ethernet (1000Base-X).
The MES provides a configurable managed switch for use in subsea distribution units or Subsea Electronics
Modules (SEMs). Interchangeable fiber optic transceivers allow for port configuration as low-power optical links
to tie-ins and other subsea nodes or as high-power optical links to the surface via long optical umbilical cables.
Complete redundancy can be achieved using multiple cards within a distribution unit or SEM. Redundancy
protocols supported by the MES include MRP (Media Redundancy Protocol) and RSTP (Rapid Spanning Tree
Protocol).
Advanced diagnostics provide real time health monitoring of the system and include optical SFP information,
temperature, voltage, current, humidity, Ethernet link status, and Ethernet switch configuration. The MES
provides diagnostics access via Telnet and Modbus TCP.
Focal’s subsea qualified fiber-optic SFP transceivers are recommended for use with this board. Options available
include bidirectional transceivers and CWDM transceivers with support for 50 km, 100 km and up to 200 km
range.
Figure 1-1: Model 922-MES
The following features and processes are used to ensure reliability and increase product life:
Conductive cooling and detailed thermal analysis
Advanced diagnostics and health monitoring via Modbus TCP
Use of industrial temperature range electronic components
No fuses, electrolytic or tantalum capacitors
Environmental stress screening
Full qualification testing per API 17F / ISO 13628-6
Traceable components
Use of field-proven electrical and optical components
Design for vibration, shock and EMC
