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Product Overview
The TOSHIBA UTNH23A is an optical shared hub unit used to build the fiber-optic transmission line of Toshiba’s TC-net 100 information and control network. It is specifically designed for the A-line transmission path and includes SNMP functionality for network monitoring and diagnostics. The unit provides eight MT-RJ optical ports plus one RJ-45 modular port, allowing TC-net 100 stations to communicate over multimode fiber while also supporting compatible twisted-pair connections. Toshiba documentation specifies a 100 Mbps TC-net 100 network, with multimode optical transmission up to 2 km. This makes the unit particularly relevant to legacy Toshiba V-series and nV-series control systems where deterministic industrial communication is required.
Technical Specifications — UTNH23A
| Parameter | Value |
|---|---|
| Product Model | UTNH23A |
| Manufacturer | Toshiba |
| Product Type | Optical Shared Hub Unit |
| Network | TC-net 100 |
| Network Role | A-line optical transmission hub |
| Optical Ports | 8 × MT-RJ |
| Electrical Port | 1 × RJ-45 |
| Data Transmission Rate | 100 Mbps |
| Optical Transmission Distance | Up to 2 km with compatible multimode fiber |
| Network Topology | Star |
| Access Method | DOMA (Deterministic Ordered Multiple Access) |
| Power Supply | 95–250 VAC, 50/60 Hz |
| Maximum Input Current | 0.5 A at 100 VAC |
| Operating Temperature | 0 to +55°C |
| Relative Humidity | 5–95% RH, non-condensing |
| Dimensions (H × W × D) | 45 × 446 × 221.5 mm |
| Weight | 5 kg or less |
| Cooling | Natural or forced air cooling |
| Management | SNMP |
| Mounting | Control cabinet / panel installation |
| Grounding | Class D grounding, ≤100 Ω |
Toshiba’s technical manual specifies the environmental, electrical, dimensional, and network parameters above. The same documentation identifies UTNH23A as the A-line unit with SNMP installed.
TOSHIBA UTNH23A
Key Features and Benefits — UTNH23A
- Eight MT-RJ fiber-optic ports for TC-net 100 network connections.
- One RJ-45 interface for compatible twisted-pair TC-net 100 equipment.
- Designed specifically for the A-side transmission path.
- Built-in SNMP supports monitoring and diagnostic functions.
- 100 Mbps deterministic industrial network communication.
- Supports multimode optical fiber transmission up to approximately 2 km.
- Suitable for Toshiba V-series and nV-series controller networks.
- Provides a practical spare option for maintaining established TC-net 100 infrastructure.
The main engineering advantage is network integration rather than conventional switching performance. The optical hub was designed around Toshiba’s deterministic TC-net 100 architecture, so replacing it with a generic Ethernet switch would not be an equivalent solution.
Related Models
UTNH23B — Optical shared hub for the B-line transmission path. It is the corresponding unit used when constructing the redundant B-side TC-net 100 network.
UTNH21B — Earlier Toshiba optical shared hub associated with the TC-net family and compatible network architectures.
UTNH22 — Related Toshiba optical shared hub used within compatible TC-net communication configurations.
TN822 — Communication interface for compatible nV-series controllers, used to connect controller stations to TC-net 100 through the optical hub architecture.
Installation and Maintenance — UTNH23A
Before replacement, verify whether the existing network is configured as A-line only or as a redundant A/B architecture. Confirm fiber type, MT-RJ connector condition, station address, DIP-switch settings, and network topology before removing the existing unit.
Use the specified AC supply and proper protective grounding. Fiber connectors should be kept clean and protected from contamination; inspect optical links for damaged or poorly seated connectors before commissioning.
After installation, verify the power indicator, optical link status, SNMP diagnostics where configured, station communication, and overall TC-net 100 network operation. Personally, I would record the original switch settings and station address before removal because a physically identical replacement can still fail to communicate when configuration settings are incorrect.
Product Warranty — UTNH23A
Warranty coverage depends on the supplier, product condition, and purchase agreement. For critical DCS networking spares, procurement records should include the complete model number, hardware revision, serial number where available, optical-port condition, inspection results, and functional-test status.
The TOSHIBA UTNH23A is a specialized TC-net 100 network component, not a general-purpose fiber Ethernet switch. Its exact A-line role, SNMP configuration, and MT-RJ optical interface should therefore be verified before replacement or substitution.
