Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | UTNH23A |
| Manufacturer | Toshiba |
| Product Type | Optical shared hub unit |
| Network Standard | TC-net 100 |
| Optical Ports | 8 |
| Optical Connector | MT-RJ |
| Additional Network Port | RJ-45 modular connector |
| Transmission Medium | Optical fiber |
| Network Role | Master optical shared hub, Line A |
| Network Management | SNMP installed |
| Message Protocol Support | TCP, UDP, IP, Toshiba PCMP |
| Input Voltage | 95–250 VAC |
| Power Consumption | 0.6 A at 100 VAC |
| Installation | Toshiba V Series system configuration |
| Operating Temperature | Confirm from applicable hardware documentation |
| Protection Rating | Not confirmed |
The connector arrangement, network role, and input power range are documented in the Toshiba UTNH23A/B user manual.
Product Introduction
The Toshiba UTNH23A is a communication component for the TC-net 100 information and control network used in Toshiba Integrated Controller V Series systems. It provides an optical shared-hub arrangement with eight MT-RJ fiber connections and an additional RJ-45 modular connection for compatible twisted-pair TC-net 100 devices. Its primary role is to establish the Line A optical transmission path and distribute network communications among connected control-system stations.
UTNH23A
The UTNH23A includes SNMP functionality for network management. In a dual-transmission-line architecture, it operates alongside the UTNH23B, which serves Line B. This distinction matters during maintenance: replacing a Line A hub with a Line B unit without reviewing the network configuration can disrupt the intended communication architecture.
Major Features and Advantages
Eight-port optical connectivity
The eight MT-RJ optical ports provide shared fiber connectivity for compatible TC-net 100 network devices. Connector type must be checked carefully because MT-RJ is not interchangeable with ST, SC, or LC fiber connectors.
Dedicated Line A network function
UTNH23A is specifically designated for the master optical shared hub on Line A. This supports installations using separate A and B transmission paths.
SNMP network management
The Line A version incorporates SNMP functionality, allowing network-management functions within the supported Toshiba architecture.
Multiple communication methods
The TC-net 100 network supports TCP, UDP, IP, and Toshiba’s PCMP protocol. These are network communication capabilities, not evidence that the unit functions as a general-purpose Ethernet switch.
Wide-range AC power input
The manual specifies an input range of 95–250 VAC. The documented power requirement is 0.6 A at 100 VAC.
Application Scenarios and Field Pitfalls
Typical applications include:
- Toshiba V Series DCS communication networks.
- Industrial controller station interconnection.
- Fiber-optic control-network distribution.
- Redundant TC-net 100 communication architectures.
- Power generation and industrial process-control installations.
Important installation checks:
- Confirm that the existing unit is UTNH23A rather than UTNH23B.
- Verify all eight MT-RJ fiber connections and their port assignments.
- Inspect fiber polarity, cable condition, and optical connector cleanliness.
- Record the existing DIP-switch settings before replacement.
- Confirm the AC input supply is within the 95–250 VAC range.
- Check the SNMP and network configuration after installation.
- Verify communication status across the Line A network before returning the controller to service.
Do not treat as a generic fiber Ethernet switch. Its network role is specific to Toshiba TC-net 100.
Related Products and Variants
| Model | Description |
|---|---|
| Master optical shared hub, Line A, SNMP installed | |
| UTNH23B | Master optical shared hub, Line B |
| JTNI21 | TC-net 100 PCI bus card, optical single bus |
| JTNI22 | TC-net 100 PCI bus card, optical duplex bus |
| JTNI41 | TC-net 100 PCI bus card, 3.3V optical single bus |
| JTNI42 | TC-net 100 PCI bus card, 3.3V optical duplex bus |
| UTNE2 | TC-net 100 Ethernet bridge unit |
These components belong to the broader Toshiba TC-net 100 communication architecture; they do not share the same function or replacement compatibility.
Procurement and Quality Control
For Toshiba procurement, request:
- Clear photographs of the model and serial-number labels.
- Front-panel photographs showing all optical ports.
- Confirmation of the Line A designation.
- Inspection of MT-RJ connectors and fiber interfaces.
- AC power-input test results.
- SNMP and network communication verification.
- Functional testing with a compatible TC-net 100 configuration.
- Confirmation of new, used, or refurbished condition.
Engineering recommendation: The most important replacement criteria are the Line A designation, MT-RJ port arrangement, SNMP configuration, and compatibility with the installed Toshiba TC-net 100 network. Do not substitute UTNH23B solely because its housing and connector arrangement appear similar.
