Model 922-420

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The Model 922-420 provides an advanced SIIS Level 1 gateway to a SIIS level 3 network, and is ideally suited to interface with modern control systems. It has been designed and qualified specifically for permanent subsea installation and is highly fault tolerant by using protection and redundant circuitry.

Advanced diagnostics provide real time health monitoring of the system and include optical SFP information, temperature, voltage, humidity, Ethernet link status, and Ethernet switch configuration. The model 922-420 uses a common unified software interface, like all of Focal’s SOC products, making integration faster and easier.

Optical communication performance can be extended by using Focal’s subsea qualified fiber-optic SFP modules. Option are available supporting tiebacks or step outs of up to 200 km.


  • 8 isolated SIIS level 1 (4-20 mA) channels
  • 1-port SIIS level 3 (100 Base-T(X) Ethernet) switch
  • Qualified per ISO 13628-6 / API 17F
  • MTBF > 200,000 hours at +40 C
  • Advanced diagnostics and configuration using Modbus TCP
  • DHCP-configured IP address with static IP backup
  • 3U Eurocard form-factor with options for front panel or heat sink
  • Failsafe remote firmware update


  • Proven SIIS level 1 & level 3 solution for subsea communications
  • Reduces cost by using standard configurations
  • Simplifies integration with unified software interface
  • Supports copper or fiber-optic connections with qualified SFP modules

Typical Applications

  • Subsea communications
  • Long distance step out or tie back
  • Interface to devices (e.g. sensors, valves, pumps)
  • Subsea Electronics Modules (SEM) and other subsea distribution nodes
  • Upgrades available for legacy communication systems



 Model 922-420 Specifications
SISS Level 1 (4-2- mA)

No. Channels

8 (8 on 21-pin Micro-D)
Sampling 1 ms
Resolution ±0.25% F.S.
Protection Over-voltage up to ±25V; ESD ±15 kV air, ± 8 kV contact
Isolation 250 Vrms
SIIS Level 3 (Optical and Copper Ethernet)
No. Ports Copper: 1 (1 on Front 9-pin Micro-D)
Optical: 2 (2 on Front SFP Port)
Format SIIS level 3, 10/100 Base-T(X)
Harness 1 x 21-pin Micro-D
Front 1 x 9-pin Micro-D
2 x SFP (optical port)
Consumption SIIS-Medium, 5.5 W typical (6 W max.)
Voltage +20 to +28 VDC, regulated
Current 0.2 A (0.5 A max.)
Protection ESD, EMI, over-voltage, reverse voltage, overcurrent (no fuses)
Ethernet Switch Layer 2, Broadcast storm protection, rate limiting, flow control, 802.1q VLAN, DHCP, 802.1p port Priority, port mirroring
Diagnostics and Configuration LED, Webserver, Modbus TCP / RTU, CLI, TELNET
Redundancy Automatic, < 3 s
Firmware Fail safe remote firmware update
Dimensions ESD, EMI, over-voltage, reverse voltage, overcurrent (no fuses), 500 Vrms isolation
Dimensions 3U Eurocard, 160 mm x 100 mm x 4 HP
Mounting Eurocard 3U rack or 4 x M3 hardware
Options Front panel
Life Cycle
Design Life > 20 years @ +40°C
MTBF > 200,000 hrs @ +40°C
Testing Factory Acceptance Test (FAT) at min. and max. temperature
Options Environmental Stress Screening, thermal or vibration
Temperature -20°C to +70°C (operation)
-40°C to +85°C (storage)
Humidity 5% to 85% RH, non-condensing
Vibration 5 g, per ISO13628-6 / API 17F
Shock 30 g, per ISO 13628-6 / API 17F
Qualification ISO 13628-6 Q1 / API 17F
Options 8000 PSI rated


Technical Support

Telephone: +1-902-468-2263